#!/usr/bin/env python
#coding: utf-8

# Copyright 2008, Tiril Anette Langfeldt Rødland
# This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
# You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>.

import os
import platform
import sys
import string
import datetime
import time
import random
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from pysqlite2 import dbapi2 as sqlite
from qrc_resources import *


__version__ = "1.1.0"


main = None
semesters = []
semester = None
courses = []
coursesString = []
books = []
booksString = []
colors = []
termList = None

### The main window
class MainWindow(QMainWindow):

    # Initialize the main window
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        
        # The program name
        self.title = self.trUtf8("Egon")
       
        # The days
        self.days = [self.trUtf8("Monday"), self.trUtf8("Tuesday"), self.trUtf8("Wednesday"), self.trUtf8("Thursday"), self.trUtf8("Friday")]

        # The tabs
        self.assignment = AssignmentTab()
        self.reading = ReadingTab()
        self.schedule = ScheduleTab()
        
        # Set the tabs in the middle
        self.tabs = QTabWidget()
        self.tabs.addTab(self.assignment, self.trUtf8("&Assignment"))
        self.tabs.addTab(self.reading, self.trUtf8("&Reading List"))
        self.tabs.addTab(self.schedule, self.trUtf8("&Schedule"))
        self.tabs.setTabShape(QTabWidget.Rounded)
        self.tabs.setTabPosition(QTabWidget.North)
        self.setCentralWidget(self.tabs)
        
        # The calendar
        self.calendarFrame = QFrame()
        self.calendarFrame.setFrameStyle(QFrame.StyledPanel|QFrame.Sunken)
        self.calendarDockWidget = QDockWidget(self.trUtf8("Calendar"), self)
        self.calendarDockWidget.setVisible(False)
        self.calendarDockWidget.setObjectName("CalendarDockWidget")
        self.calendarDockWidget.setAllowedAreas(Qt.LeftDockWidgetArea|Qt.RightDockWidgetArea|Qt.BottomDockWidgetArea)
        self.calendar = QCalendarWidget()
        self.calendar.setFirstDayOfWeek(Qt.Monday)
        self.calendarLayout = QVBoxLayout()
        self.calendarLayout.addWidget(self.calendar)
        self.calendarFrame.setLayout(self.calendarLayout)
        self.calendarFrame.hide()
        self.calendarDockWidget.setWidget(self.calendarFrame)
        
        # The semesters
        global semester, semesters, termList
        termList = QStringList()
        termList.append(self.trUtf8("Spring"))
        termList.append(self.trUtf8("Autumn"))
        semesters = getSemestersFromDB()
        semester = self.getLatestSemester(semesters)	
        if semester:
            self.load(semester)		

        # Actions
        fileNewAction = self.createAction(self.trUtf8("&New"), self.fileNew, QKeySequence.New, "filenew", self.trUtf8("Create a new semester plan"))
        fileOpenAction = self.createAction(self.trUtf8("&Open"), self.fileOpen, QKeySequence.Open, "fileopen",  self.trUtf8("Open an existing semester plan"))
        fileQuitAction = self.createAction(self.trUtf8("&Quit"), self.close, "Ctrl+Q", "filequit", self.trUtf8("Quit program"))
        editAddCourse = self.createAction(self.trUtf8("Add &course"), self.addCourse, "Ctrl+C", None, self.trUtf8("Add a new course"))
        editAddBook = self.createAction(self.trUtf8("Add &book"), self.addBook, "Ctrl+B", None, self.trUtf8("Add a new book"))
        editAddAssignment = self.createAction(self.trUtf8("Add &assignment"), self.addAssignment, "Ctrl+A", None, self.trUtf8("Add a new assignment"))
        editAddReading = self.createAction(self.trUtf8("Add &reading"), self.addReading, "Ctrl+R", None, self.trUtf8("Add a new reading"))
        editAddLesson = self.createAction(self.trUtf8("Add &lesson"), self.addLesson, "Ctrl+L", None, self.trUtf8("Add a new lesson"))
        editShowCalendar = self.createAction(self.trUtf8("Cal&endar"), self.showCalendar, "Ctrl+E", None, self.trUtf8("Show the calendar"))
        helpAboutScheduler = self.createAction(self.trUtf8("&About Egon"))
        
        # Menus
        self.fileMenu = self.menuBar().addMenu(self.trUtf8("&File"))
        self.editMenu = self.menuBar().addMenu(self.trUtf8("&Edit"))
        self.helpMenu = self.menuBar().addMenu(self.trUtf8("&Help"))
        
        # Add actions to the menus
        self.addActions(self.fileMenu, (fileNewAction, fileOpenAction, None, fileQuitAction))
        self.addActions(self.editMenu, (editAddCourse, editAddBook, None, editAddAssignment, None, editAddReading, None, editAddLesson, None, editShowCalendar))
        self.addActions(self.helpMenu, (helpAboutScheduler, None))
        
        # Connect statements
        self.connect(editAddCourse, SIGNAL("triggered()"), self.addCourse)
        self.connect(editAddBook, SIGNAL("triggered()"), self.addBook)
        self.connect(editAddAssignment, SIGNAL("triggered()"), self.addAssignment)
        self.connect(editAddReading, SIGNAL("triggered()"), self.addReading)
        self.connect(editAddLesson, SIGNAL("triggered()"), self.addLesson)
        self.connect(editShowCalendar, SIGNAL("pressed()"), self.showCalendar)
        self.connect(helpAboutScheduler, SIGNAL("triggered()"), self.helpAbout)
        self.connect(self.assignment.addAssignmentButton, SIGNAL("pressed()"), self.addAssignment)
        self.connect(self.assignment.deleteAssignmentButton, SIGNAL("pressed()"), self.deleteAssignment)
        self.connect(self.assignment.statusAssignmentBox, SIGNAL("currentIndexChanged(QString)"), self.statusAssignment)
        self.connect(self.reading.addReadingButton, SIGNAL("pressed()"), self.addReading)
        self.connect(self.reading.deleteReadingButton, SIGNAL("pressed()"), self.deleteReading)	
        self.connect(self.reading.readingDoneButton, SIGNAL("pressed()"), self.doneReading)
        self.connect(self.schedule.addScheduleButton, SIGNAL("pressed()"), self.addLesson)
        self.connect(self.schedule.deleteScheduleButton, SIGNAL("pressed()"), self.deleteLesson)

        # The toolbars
        fileToolbar = self.addToolBar(self.trUtf8("File"))
        fileToolbar.setObjectName("FileToolBar")
        self.addActions(fileToolbar, (fileNewAction, fileOpenAction, None, fileQuitAction))
        editToolbar = self.addToolBar(self.trUtf8("Edit"))
        editToolbar.setObjectName("EditToolBar")
        self.addActions(editToolbar, (editAddCourse, editAddBook, None, editShowCalendar))
        
        # Set the title
        self.setMainWindowTitle()
        
        # The courses
        courses = getCourses()
        makeCoursesString()

        # This window
        global main
        main = self	
    
    # Semester

    ## Open the New dialog	
    def fileNew(self):
        self.nsdlg = NewSemesterDlg()
        self.nsdlg.show()

    ## Open the Open dialog
    def fileOpen(self):
        self.osdlg = OpenSemesterDlg()
        self.osdlg.show()	
        
    ## Return the latest semester
    def getLatestSemester(self, semesters):
        if len(semesters) == 0:
            return None	
        global termList
        max = semesters[0]
        for s in semesters:
            if s.getYear() > max.getYear(): 		
                max = s
            if s.getYear() == max.getYear():
                if s.getTerm() == self.trUtf8("Autumn"):
                    max = s
        return max

    # Return the list of terms
    def getTermList(self):
        global termList
        return termList	

    # Assignment

    ## Open the Add Assignment dialog
    def addAssignment(self):
        self.adlg = AssignmentDlg()
        self.adlg.show()
    
    ## Delete the assignment from the database and the table
    def deleteAssignment(self):
        course, number = self.getCourseAndNumber()
        table, row = self.getAssignmentTableAndRow()	
        global semester
        removeAssignmentFromDB(course, number) 
        table.removeRow(row)	
        table.horizontalHeader().setResizeMode(QHeaderView.ResizeToContents)

    ## Update the assignment's completion level to the specified level
    def statusAssignment(self, completionLevel):
        course, number = self.getCourseAndNumber()
        table, row = self.getAssignmentTableAndRow()
        updateAssignmentCompletion(course, number, completionLevel)
        item = QTableWidgetItem(QString(completionLevel))	
        item.setBackground(self.assignment.makeBrush(completionLevel))
        table.setItem(row, 4, item)
        table.horizontalHeader().setResizeMode(QHeaderView.ResizeToContents)

    ## Return the assignment table and its current row
    def getAssignmentTableAndRow(self):
        table = self.assignment.assignmentTable
        row = table.currentRow()	
        return table, row	

    ## Return the course and number of the current assignment
    def getCourseAndNumber(self):
        table, row = self.getAssignmentTableAndRow()
        courseItem = table.item(row, 1)
        numberItem = table.item(row, 2)
        courseFull = courseItem.text()
        number = numberItem.text()
        course = getCourseCode(courseFull)
        return course, number

    # Reading

    ## Open the Add Reading dialog
    def addReading(self):
        self.rdlg = ReadingDlg()
        self.rdlg.show()

    ## Delete the reading from the database and the table
    def deleteReading(self):
        week, course, book, chapter = self.getWeekCourseBookAndChapter()	    
        table, row = self.getReadingTableAndRow()
        global semester	
        removeReadingFromDB(week, course, book, chapter)
        table.removeRow(row)
        table.horizontalHeader().setResizeMode(QHeaderView.ResizeToContents)
    
    ## Mark the reading as done
    def doneReading(self):
        table, row = self.getReadingTableAndRow()
        if table.item(row, 6).text().compare(QString(self.trUtf8("Not done"))) == 0:
            done = True
            item = QTableWidgetItem(self.trUtf8("Done"))	    
            item.setBackground(QBrush(Qt.green, Qt.SolidPattern))	    
        else:
            done = True		
            item = QTableWidgetItem(self.trUtf8("Not done"))	 
            item.setBackground(QBrush(Qt.red, Qt.SolidPattern))	    
        table.setItem(row, 6, item)
        table.horizontalHeader().setResizeMode(QHeaderView.ResizeToContents)
        week = (table.item(row, 0).text().toInt())[0]	
        courseFull = table.item(row, 1).text()
        courseCode = QString(getCourseCode(courseFull))
        bookTitle = table.item(row, 2).text()
        book = getBookWithTitleFromDB(bookTitle)
        bookIsbn = book.getIsbn()
	chapter = table.item(row, 3).text()
        updateReadingDone(week, courseCode, bookIsbn, chapter, done)
        print week, courseCode, bookIsbn, chapter, done
   
    ## Return the reading table and its current row 
    def getReadingTableAndRow(self):
        table = self.reading.readingTable
        row = table.currentRow()
        return table, row	

    ## Return the week, course and book of the current reading
    def getWeekCourseBookAndChapter(self):
        table, row = self.getReadingTableAndRow()
        weekItem = table.item(row, 0)
        courseItem = table.item(row, 1)
        bookItem = table.item(row, 2)
	chapterItem = table.item(row, 3)
        week = (weekItem.text().toInt())[0]	
        courseFull = courseItem.text()
        courseCode = getCourseCode(courseFull)
        book = getBookWithTitleFromDB(bookItem.text())
	chapter = chapterItem.text()
        return week, courseCode, book.getIsbn(), chapter

    # Schedule

    ## Open the Add Lesson dialog
    def addLesson(self): 
        self.sdlg = ScheduleDlg()        
        self.sdlg.show()
   
    ## Delete the lesson from the database and the table
    def deleteLesson(self):
        table, row, column = self.getScheduleTableRowAndColumn()	    
        day, course, time = self.getDayCourseAndTime()  
        global semester	
        removeLessonFromDB(day, course, time)   
        table.setItem(row, column, QTableWidgetItem())

    ## Return the schedule table and the current row and column
    def getScheduleTableRowAndColumn(self):
        table = self.schedule.scheduleTable	    
        row = table.currentRow()
        column = table.currentColumn()
        return table, row, column	

    ## Return the day, course and time of the current lesson
    def getDayCourseAndTime(self):
        table, row, column = self.getScheduleTableRowAndColumn()
        item = table.item(row, column)
        text = item.text()
        textlist = text.split('\n')
        courseFull = textlist[0]
        coursecode = getCourseCode(courseFull)	
        day = self.getDayFromTable(column)
        time = row + 8
        return day, coursecode, time	

    ## Return the day belonging to the specified column
    def getDayFromTable(self, column):
        return self.days[column]

    # Course

    ## Open the Add Course dialog
    def addCourse(self):
        self.cdlg = CourseDlg()
        self.cdlg.show()

    # Book

    ## Open the Add Book dialog
    def addBook(self):
        self.bdlg = BookDlg()
        self.bdlg.show()
        
    # Calendar

    ## Show the calendar
    def showCalendar(self):
        if self.calendarDockWidget.isVisible():
            self.removeDockWidget(self.calendarDockWidget)
        else:
            self.addDockWidget(Qt.BottomDockWidgetArea, self.calendarDockWidget)
            self.calendarDockWidget.setVisible(True)

    # General

    ## Make and open the About dialo    
    def helpAbout(self):
        QMessageBox.about(self, "About %s" % self.title, """
        <b>%s</b> v %s 
        <p>Copyright &copy; 2008 Tiril Anette Langfeldt Roedland. No rights reserved. 
        <p>You may modify and redistribute the program under the terms of the GPL. The license can be found here: http://www.gnu.org/licenses/gpl.html
        <p>This application is mainly for use by students, and can be used to keep track of assignments, planned readings and the schedule.
        <p>Python %s - Qt %s - PyQt %s on %s
        <p>Developer: Tiril Anette Langfeldt Roedland, tirilane@pvv.ntnu.no
        """ % (self.title, __version__, platform.python_version(), QT_VERSION_STR, PYQT_VERSION_STR, platform.system()))
    
    ## Updates the File menu
    def updateFileMenu(self):
        self.fileMenu.clear()
        self.addActions(self.fileMenu, self.fileMenuActions[:-1])
        current = QString(self.filename) if self.filename is not None else None
   
    ## Create and return the action specified by the input
    def createAction(self, text, slot=None, shortcut=None, icon=None, tip=None, checkable=False, signal="triggered()"):
        action = QAction(text, self)
        if icon is not None:
            iconfile = ":/%s.png" % icon
            action.setIcon(QIcon(iconfile))
        if shortcut is not None:
            action.setShortcut(shortcut)
        if tip is not None:
            action.setToolTip(tip)
            action.setStatusTip(tip)
        if slot is not None:
            self.connect(action, SIGNAL(signal), slot)
        if checkable:
            action.setCheckable(True)
        return action

    ## Add action to the target
    def addActions(self, target, actions):
        for action in actions:
            if action is None:
                target.addSeparator()
            else:
                target.addAction(action)
        
    ## Set the title on the main window, depending on the chosen semester
    def setMainWindowTitle(self):
        global semester
        if semester:	
            self.setWindowTitle("%s : %s %i" % (self.title, semester.getTerm(), semester.getYear()))
        else:
            self.setWindowTitle(self.title)	

    ## Load the assignments, readings and schedule from the specified semester
    def load(self, semester):
        self.assignment.updateTable(semester)
        self.reading.updateTable(semester)
        self.schedule.updateTable(semester)	


### The New Semester dialog
class NewSemesterDlg(QDialog):

    ## Initialize the New Semester dialog
    def __init__(self, parent=None):
        super(NewSemesterDlg, self).__init__(parent)

        # Labels
        self.termLabel = QLabel(self.trUtf8("Semester"))
        self.yearLabel = QLabel(self.trUtf8("Year"))
        
        # Widgets
        self.termEdit = QComboBox()
        self.yearEdit = QSpinBox()
        self.termEdit.addItems(getMain().getTermList())
        self.yearEdit.setRange(2000, 2050)
        self.yearEdit.setSingleStep(1)
        self.buttonBox = QDialogButtonBox(QDialogButtonBox.Ok|QDialogButtonBox.Cancel)

        # Layout
        layout = QGridLayout()
        layout.addWidget(self.termLabel, 0, 0)
        layout.addWidget(self.termEdit, 0, 1)
        layout.addWidget(self.yearLabel, 1, 0)
        layout.addWidget(self.yearEdit, 1, 1)
        layout.addWidget(self.buttonBox, 2, 1)	
        self.setLayout(layout)

        # Connect statements
        self.connect(self.buttonBox, SIGNAL("accepted()"), self, SLOT("accept()"))
        self.connect(self.buttonBox, SIGNAL("rejected()"), self, SLOT("reject()"))

        # Set the title
        self.setWindowTitle(self.trUtf8("New semester"))

    ## Accept the dialog and add the specified semester	
    def accept(self):
        term = unicode(self.termEdit.currentText())
        year = self.yearEdit.value()
        global semester
        semester = SemesterModel(term, year)
        addNewSemesterToDB(term, year)
        getMain().load(semester)
        getMain().setMainWindowTitle()	
        self.close()	


### The Open Semester dialog
class OpenSemesterDlg(QDialog):

    ## Initialize the Open Semester dialog	
    def __init__(self, parent=None):
        super(OpenSemesterDlg, self).__init__(parent)

        # Widgets
        self.semesterList = QListWidget()
        semesters = getSemestersFromDB()        
        semesterlist = QStringList()
        for semester in semesters:
            semesterlist.append("%s %i" % (semester.getTerm(), semester.getYear()))
        self.semesterList.addItems(semesterlist)	   
        self.buttonBox = QDialogButtonBox(QDialogButtonBox.Ok|QDialogButtonBox.Cancel)

        # Layout
        layout = QVBoxLayout()
        layout.addWidget(self.semesterList)
        layout.addStretch()
        layout.addWidget(self.buttonBox)
        self.setLayout(layout)

        # Connect statements
        self.connect(self.buttonBox, SIGNAL("accepted()"), self, SLOT("accept()"))
        self.connect(self.buttonBox, SIGNAL("rejected()"), self, SLOT("reject()"))

        # Set the title
        self.setWindowTitle(self.trUtf8("Open semester"))

    ## Accept the dialog and open the specified semester	
    def accept(self):
        text = self.semesterList.currentItem().text()
        textlist = text.split(' ')
        term = textlist[0]
        year = textlist[1].toInt()[0]	
        global semester
        semester = SemesterModel(term, year)
        semester.setAssignments(getAssignmentsFromDB(semester))
        semester.setReadings(getReadingsFromDB(semester))
        semester.setLessons(getLessonsFromDB(semester))
        getMain().load(semester)
        getMain().setMainWindowTitle()	
        self.close()	


### The semester model
class SemesterModel():
    
    term = ""
    year = 0
    assignments = []
    readings = []
    lessons = []

    ## Initialize the semester model
    def __init__(self, term, year):
        self.term = term
        self.year = year

    ## Return the term of the semester
    def getTerm(self):
        return self.term

    ## Return the year of the semester
    def getYear(self):
        return self.year

    ## Add an assignment to the semester's list of assignments
    def addAssignment(self, assignment):
        self.assignments.append(assignment)

    ## Set the list of assignments
    def setAssignments(self, assignments):
        self.assignments = assignments

    ## Return the list of assignments
    def getAssignments(self):
        return self.assignments

    ## Add a reading to the semester's list of readings
    def addReading(self, reading):
        self.readings.append(reading)

    ## Set the list of readings
    def setReadings(self, readings):
        self.readings = readings

    ## Return the list of readings
    def getReadings(self):
        return self.readings

    ## Add a lesson to the semester's list of lessons
    def addLesson(self, lesson):
        self.lessons.append(lesson)
 
    ## Set the list of lessons
    def setLessons(self, lessons):
        self.lessons = lessons

    ## Return the list of lessons
    def getLessons(self):
        return self.lessons	    


### The contents of the Assignment tab
class AssignmentTab(QWidget):
    
    ## Initialize the Assignment tab
    def __init__(self, parent=None):
        super(AssignmentTab, self).__init__(parent)

        # Widgets
        self.addAssignmentButton = QPushButton("Add assignment")
        self.statusAssignmentBox = QComboBox()
        self.deleteAssignmentButton = QPushButton("Delete assignment")
        statusTypes = [self.trUtf8("Not available"), self.trUtf8("Available"), self.trUtf8("Begun"), self.trUtf8("Finished"), self.trUtf8("Delivered"), self.trUtf8("Approved"), self.trUtf8("Not approved")]
        self.statusAssignmentBox.addItems(statusTypes)

        # Make the table
        self.makeTable()

        # Layout
        self.vlayout = QVBoxLayout()
        self.hlayout = QHBoxLayout()
        self.hlayout.addWidget(self.addAssignmentButton)
        self.hlayout.addWidget(self.deleteAssignmentButton)
        self.hlayout.addWidget(self.statusAssignmentBox)
        self.hlayout.addStretch() 
        self.vlayout.addWidget(self.assignmentTable)
        self.vlayout.addLayout(self.hlayout)
        self.setLayout(self.vlayout)

    ## Make an empty assignment table
    def makeTable(self, current=None):
        self.assignmentTable = QTableWidget(0, 5, self)
        self.assignmentTable.clear()
        
	self.assignmentHeaderList = QStringList()
        self.assignmentHeaderList.append(self.trUtf8("Date"))
        self.assignmentHeaderList.append(self.trUtf8("Course"))
        self.assignmentHeaderList.append(self.trUtf8("Number"))
        self.assignmentHeaderList.append(self.trUtf8("Description"))
        self.assignmentHeaderList.append(self.trUtf8("Status"))
        
        self.assignmentTable.setHorizontalHeaderLabels(self.assignmentHeaderList)
        self.assignmentTable.setAlternatingRowColors(True)
        self.assignmentTable.setEditTriggers(QAbstractItemView.NoEditTriggers)
        self.assignmentTable.setSelectionBehavior(QAbstractItemView.SelectRows)
        self.assignmentTable.setSelectionMode(QAbstractItemView.SingleSelection)
        
        selected = None

    ## Add the assignments of the semester to the table
    def updateTable(self, semester, current=None):
        self.assignments = getAssignmentsFromDB(semester)
        rows = len(self.assignments)
        self.assignmentTable.setRowCount(rows)

        for row in range(rows):
            self.addAssignmentToTable(row)		
        
        self.assignmentTable.horizontalHeader().setResizeMode(QHeaderView.ResizeToContents)
        self.assignmentTable.sortItems(0, Qt.AscendingOrder)

    ## Add new assignment to Table
    def addAssignmentToTable(self, row, assignment=None):
        if assignment == None:
            assignment = self.assignments[row]
        
        status = QString(assignment.getStatus())
        brush = self.makeBrush(status)	    
        
        self.assignmentTable.setItem(row, 0, QTableWidgetItem(QString(assignment.getDate().toString("yyyy-MM-dd hh:mm, ddd"))))
        self.assignmentTable.setItem(row, 1, QTableWidgetItem(QString(assignment.getCourse().getFull())))
        self.assignmentTable.setItem(row, 2, QTableWidgetItem(QString("%i" % assignment.getNumber())))
        self.assignmentTable.setItem(row, 3, QTableWidgetItem(QString("%s" % assignment.getDescription())))
        
        statusItem = QTableWidgetItem(status)
        statusItem.setBackground(brush)
        self.assignmentTable.setItem(row, 4, statusItem)

    ## Set the right brush and color for the assignment, depending on level of completion
    def makeBrush(self, status):
        brush = QBrush(Qt.NoBrush)
        if status.compare(QString(self.trUtf8("Available"))) == 0:
            brush.setStyle(Qt.Dense7Pattern)	
            brush.setColor(QColor(Qt.cyan))
        elif status.compare(QString(self.trUtf8("Begun"))) == 0:
            brush.setStyle(Qt.Dense5Pattern)		
            brush.setColor(QColor(Qt.cyan))
        elif status.compare(QString(self.trUtf8("Finished"))) == 0:
            brush.setStyle(Qt.Dense3Pattern)		
            brush.setColor(QColor(Qt.cyan))
        elif status.compare(QString(self.trUtf8("Delivered"))) == 0:
            brush.setStyle(Qt.Dense1Pattern)		
            brush.setColor(QColor(Qt.cyan))
        elif status.compare(QString(self.trUtf8("Approved"))) == 0:
            brush.setStyle(Qt.SolidPattern)		
            brush.setColor(QColor(Qt.green))
        elif status.compare(QString(self.trUtf8("Not approved"))) == 0:
            brush.setStyle(Qt.SolidPattern)		
            brush.setColor(QColor(Qt.red))
        else:
            brush.setStyle(Qt.NoBrush)
        return brush
   	  

### The Add Assignment dialog
class AssignmentDlg(QDialog):
    
    ## Initialize the Add Assignment dialog
    def __init__(self, parent=None):
        super(AssignmentDlg, self).__init__(parent)
           
        # Labels
        self.dateLabel = QLabel(self.trUtf8("&Date"))
        self.courseLabel = QLabel(self.trUtf8("&Course"))
        self.numberLabel = QLabel(self.trUtf8("&Number"))
        self.descriptionLabel = QLabel(self.trUtf8("De&scription"))
        self.statusLabel = QLabel(self.trUtf8("&Status"))

        # Widgets
        self.dateEdit = QLineEdit("DD.MM.YYYY HH:MM")
        self.dateEdit.setSelection(0, 16)
        self.courseEdit = QComboBox()
        self.courseEdit.addItems(makeCoursesString())
        self.numberEdit = QSpinBox()
        self.numberEdit.setRange(1, 20)
        self.descriptionEdit = QLineEdit()
        self.statusEdit = QComboBox()
        statusTypes = [self.trUtf8("Not available"), self.trUtf8("Available"), self.trUtf8("Begun"), self.trUtf8("Finished"), self.trUtf8("Delivered"), self.trUtf8("Approved"), self.trUtf8("Not approved")]
        self.statusEdit.addItems(statusTypes)
        self.buttonBox = QDialogButtonBox(QDialogButtonBox.Ok|QDialogButtonBox.Cancel)
        
        # Buddies
        self.dateLabel.setBuddy(self.dateEdit)
        self.courseLabel.setBuddy(self.courseEdit)
        self.numberLabel.setBuddy(self.numberEdit)
        self.descriptionLabel.setBuddy(self.descriptionEdit)
        self.statusLabel.setBuddy(self.statusEdit)
        
        # Layout
        self.layout = QGridLayout()
        self.layout.addWidget(self.dateLabel, 0, 0)
        self.layout.addWidget(self.courseLabel, 1, 0)
        self.layout.addWidget(self.numberLabel, 2, 0)
        self.layout.addWidget(self.descriptionLabel, 3, 0)
        self.layout.addWidget(self.statusLabel, 4, 0)
        self.layout.addWidget(self.dateEdit, 0, 1)
        self.layout.addWidget(self.courseEdit, 1, 1)
        self.layout.addWidget(self.numberEdit, 2, 1)
        self.layout.addWidget(self.descriptionEdit, 3, 1)
        self.layout.addWidget(self.statusEdit, 4, 1)
        self.layout.addWidget(self.buttonBox, 5, 0, 1, 2)
        self.setLayout(self.layout)

        # Connect statements
        self.connect(self.buttonBox, SIGNAL("accepted()"), self, SLOT("accept()"))
        self.connect(self.buttonBox, SIGNAL("rejected()"), self, SLOT("reject()"))
        
        # Set the title
        self.setWindowTitle(self.trUtf8("Add new assignment"))

    ## Return an array with the values of the widgets
    def getValues(self):
        assignment = []
        assignment.append(unicode(self.dateEdit.text()))
        assignment.append(unicode(self.courseEdit.currentText()))
        assignment.append(self.numberEdit.value())
        assignment.append(unicode(self.descriptionEdit.text()))
        assignment.append(unicode(self.statusEdit.currentText()))	
        return assignment

    ## Accept the dialog and add the specified assignment 
    def accept(self):
        assignmentList = self.getValues()	
        dateString = assignmentList[0]
        courseFull = assignmentList[1]
        number = assignmentList[2]
        description = assignmentList[3]
        status = assignmentList[4]

        regex = QRegExp(r"[01-31].[01-12].[2000-2050] [00-23]:[00-60]")
        validator = QRegExpValidator(regex, self)
        valid = validator.validate(dateString, 16)	
        if valid == QValidator.Invalid:
            regexMessage = QErrorMessage()
            regexMessage.showMessage(QString(self.trUtf8("The date is not in a correct format.")))

        if len(dateString) <= 11:
            dateList = dateString.split('.')		
            timeList = ['00', '00']
        else:
            dateTime = dateString.split()
            dateList = dateTime[0].split('.')
            timeList = dateTime[1].split(':')

        if dateList[1] > '13':
            dateMessage = QErrorMessage()
        elif dateList[0] > '31':
            dateMessage = QErrorMessage()
            dateMessage.showMessage(QString(self.trUtf8("The day is not valid. Please enter a valid date.")))	
        elif timeList[0] > '23':
            dateMessage = QErrorMessage()
            dateMessage.showMessage(QString(self.trUtf8("The hour is not valid. Please enter a valid time.")))
        elif timeList[1] > '59':
            dateMessage = QErrorMessage()
            dateMessage.showMessage(QString(self.trUtf8("The minutes are not valid. Please enter a valid time.")))
        else: 
            try:
                date = QDate(string.atoi(dateList[2]), string.atoi(dateList[1]), string.atoi(dateList[0]))
                time = QTime(string.atoi(timeList[0]), string.atoi(timeList[1]))
                datetime = QDateTime(date, time)
            except ValueError, e:
                valueMessage = QErrorMessage()
                valueMessage.showMessage(QString(self.trUtf8("The date is not valid. Please enter a date on the DD.MM.YYYY HH:MM form.")))	

            course = getCourseFromDB(getCourseCode(courseFull))

            try:
                global semester
                addNewAssignmentToDB(semester, datetime, course, number, description, status)
                assignment = AssignmentModel(datetime, course, number, description, status)
            except UnboundLocalError, e:
                pass

            table = getMain().assignment.assignmentTable
            row = table.rowCount()
            table.insertRow(row)
            getMain().assignment.addAssignmentToTable(row, assignment)
            table.sortItems(0, Qt.AscendingOrder)
        
        self.close()


### The assignment model
class AssignmentModel():

    date = None
    course = None
    number = 0
    description = ""
    status = ""

    ## Initialize the assignment model
    def __init__(self, date, course, number, description, status):
        self.date = date
        self.course = course
        self.number = number
        self.description = description
        self.status = status

    ## Return the date the assignment is due
    def getDate(self):
        return self.date
    
    ## Return the course the assignment is given in
    def getCourse(self):
        return self.course

    ## Return the number of the assignment
    def getNumber(self):
        return self.number

    ## Return the description of the assignment
    def getDescription(self):
        return self.description
    
    ## Return the level of completion for the assignment
    def getStatus(self):
        return self.status


### The contents of the Reading tab
class ReadingTab(QWidget):

    ## Initialize the Reading tab
    def __init__(self, parent=None):
        super(ReadingTab, self).__init__(parent)
        
        # Widgets
        self.addReadingButton = QPushButton(self.trUtf8("Add pages to read"))
        self.deleteReadingButton = QPushButton(self.trUtf8("Delete pages"))
        self.readingDoneButton = QPushButton(self.trUtf8("Done"))
        
        # Make the table
        self.makeTable()

        # Layout
        self.vlayout = QVBoxLayout()
        self.hlayout = QHBoxLayout()
        self.hlayout.addWidget(self.addReadingButton)
        self.hlayout.addWidget(self.deleteReadingButton)
        self.hlayout.addWidget(self.readingDoneButton)
        self.hlayout.addStretch()
        self.vlayout.addWidget(self.readingTable)
        self.vlayout.addLayout(self.hlayout)
        self.setLayout(self.vlayout)

    ## Make an empty reading table
    def makeTable(self, current=None):
        self.readingTable = QTableWidget(0, 7, self)
        self.readingTable.clear()
        self.readingHeaderList = QStringList()
        self.readingHeaderList.append(self.trUtf8("Week"))
        self.readingHeaderList.append(self.trUtf8("Course"))
        self.readingHeaderList.append(self.trUtf8("Book"))
        self.readingHeaderList.append(self.trUtf8("Chapter"))
        self.readingHeaderList.append(self.trUtf8("Pages"))
        self.readingHeaderList.append(self.trUtf8("Number of pages"))
        self.readingHeaderList.append(self.trUtf8("Done"))	
        self.readingTable.setHorizontalHeaderLabels(self.readingHeaderList)
        self.readingTable.setAlternatingRowColors(True)
        self.readingTable.setEditTriggers(QAbstractItemView.NoEditTriggers)
        self.readingTable.setSelectionBehavior(QAbstractItemView.SelectRows)
        self.readingTable.setSelectionMode(QAbstractItemView.SingleSelection)
        selected = None
        
    ## Add the readings of the semester to the table
    def updateTable(self, semester):
        self.readings = getReadingsFromDB(semester)	
        rows = len(self.readings)
        self.readingTable.setRowCount(rows)	
        for row in range(rows):
            self.addReadingToTable(row)
        self.readingTable.horizontalHeader().setResizeMode(QHeaderView.ResizeToContents)
        self.readingTable.sortItems(0, Qt.AscendingOrder)

    ## Add a new reading to the table
    def addReadingToTable(self, row, reading=None):
        if reading == None:
            reading = self.readings[row]
        
        brush = QBrush(Qt.NoBrush)
        brush.setStyle(Qt.SolidPattern)

        if reading.getDone():
           doneString = self.trUtf8("Done")
           brush.setColor(Qt.green)
        else:
           doneString = self.trUtf8("Not done")
           brush.setColor(Qt.red)	   

        self.readingTable.setItem(row, 0, QTableWidgetItem(QString("%02s" % reading.getWeek())))	
        self.readingTable.setItem(row, 1, QTableWidgetItem(QString(reading.getCourse().getFull())))	    
        self.readingTable.setItem(row, 2, QTableWidgetItem(QString(reading.getBook().getTitle())))
        self.readingTable.setItem(row, 3, QTableWidgetItem(QString(reading.getChapter())))
        self.readingTable.setItem(row, 4, QTableWidgetItem(QString(reading.getPages())))
        self.readingTable.setItem(row, 5, QTableWidgetItem(QString("%i" % reading.getNumberOfPages())))
        
        item = QTableWidgetItem(QString(doneString))
        item.setBackground(brush)
        self.readingTable.setItem(row, 6, item)


### The Add Reading dialog
class ReadingDlg(QDialog):
    
    ## Initialize the Add Reading dialog
    def __init__(self, parent=None):
        super(ReadingDlg, self).__init__(parent)

        # Labels
        self.weekLabel = QLabel(self.trUtf8("&Week"))
        self.courseLabel = QLabel(self.trUtf8("&Course"))
        self.bookLabel = QLabel(self.trUtf8("&Book"))
        self.chapterLabel = QLabel(self.trUtf8("Cha&pter"))
        self.pagesLabel = QLabel(self.trUtf8("&Pages"))
                
        # Widgets
        self.weekEdit = QSpinBox()
        self.weekEdit.setRange(1, 52)
        self.courseEdit = QComboBox()
        coursesStringList = QStringList()
        courses = makeCoursesString()
        for course in courses:
            coursesStringList.append(course)		
        self.courseEdit.addItems(coursesStringList)
        self.bookEdit = QComboBox()
        booksStringList = QStringList()
        books = makeBooksString()
        for book in books:
            booksStringList.append(book)
        self.bookEdit.addItems(booksStringList)
        self.chapterEdit = QLineEdit()
        self.pagesEdit = QLineEdit()
        self.buttonBox = QDialogButtonBox(QDialogButtonBox.Ok|QDialogButtonBox.Cancel)
        
        # Buddies
        self.weekLabel.setBuddy(self.weekEdit)
        self.courseLabel.setBuddy(self.courseEdit)
        self.bookLabel.setBuddy(self.bookEdit)
        self.chapterLabel.setBuddy(self.chapterEdit)
        self.pagesLabel.setBuddy(self.pagesEdit)
        
        # Layout
        self.layout = QGridLayout()
        self.layout.addWidget(self.weekLabel, 0, 0)
        self.layout.addWidget(self.courseLabel, 1, 0)
        self.layout.addWidget(self.bookLabel, 2, 0)
        self.layout.addWidget(self.chapterLabel, 3, 0)
        self.layout.addWidget(self.pagesLabel, 4, 0)
        self.layout.addWidget(self.weekEdit, 0, 1)
        self.layout.addWidget(self.courseEdit, 1, 1)
        self.layout.addWidget(self.bookEdit, 2, 1)
        self.layout.addWidget(self.chapterEdit, 3, 1)
        self.layout.addWidget(self.pagesEdit, 4, 1)
        self.layout.addWidget(self.buttonBox, 5, 0, 1, 2)
        self.setLayout(self.layout)

        # Connect statements 
        self.connect(self.buttonBox, SIGNAL("accepted()"), self, SLOT("accept()"))
        self.connect(self.buttonBox, SIGNAL("rejected()"), self, SLOT("reject()"))
       
        # Set the title
        self.setWindowTitle(self.trUtf8("Add new reading"))

    ## Accept the dialog and add the specified reading
    def accept(self):
        week = unicode(self.weekEdit.value())
        courseFull = unicode(self.courseEdit.currentText())
        bookTitle = unicode(self.bookEdit.currentText())
        chapter = unicode(self.chapterEdit.text())
        pages = unicode(self.pagesEdit.text())

        self.close()

        course = getCourseFromDB(getCourseCode(courseFull))
        book = getBookWithTitleFromDB(bookTitle)

        global semester
        addNewReadingToDB(semester, week, course, book, chapter, pages, False)

        reading = ReadingModel(week, course, book, chapter, pages, False)
        table = getMain().reading.readingTable
        row = table.rowCount()
        table.insertRow(row)
        getMain().reading.addReadingToTable(row, reading)
        table.sortItems(0, Qt.AscendingOrder)


### The reading model
class ReadingModel():

    week = 0
    course = None
    book = None
    chapter = ""
    pages = ""
    numberOfPages = 0
    done = False

    ## Initialize the reading model
    def __init__(self, week, course, book, chapter, pages, done=False):
        self.week = week
        self.course = course	
        self.book = book
        self.chapter = chapter
        self.pages = pages
        self.numberOfPages = self.getNumberOfPages()	
        self.done = done	

    ## Return the week the reading shall be done
    def getWeek(self):
        return self.week

    ## Return the course the reading is in
    def getCourse(self):
        return self.course
    
    ## Return the book to be read in
    def getBook(self):
        return self.book
    
    ## Return the chapter to be read
    def getChapter(self):
        return self.chapter
    
    ## Return the pages to be read
    def getPages(self):
        return self.pages
    
    ## Return the number of pages to be read
    def getNumberOfPages(self):
        pages = self.getPages()
        pagesArray = pages.split(",")
        nextArray = []
        sum = 0
        for p in pagesArray:
            p.strip()		
            nextArray.append(p.split("-"))
        for n in nextArray:
            sum += int(n[1]) - int(n[0]) + 1
        return sum

    ## Return whether the reading has been done or not
    def getDone(self):
        return self.done	    


### The contents of the Schedule tab
class ScheduleTab(QWidget):
    
    ## Initialize the Schedule tab
    def __init__(self, parent=None):
        super(ScheduleTab, self).__init__(parent)
        
        # Widgets
        self.addScheduleButton = QPushButton("Add lesson")
        self.deleteScheduleButton = QPushButton("Delete lesson")
        
        # Make the table
        self.makeTable()

        # Layout
        self.vlayout = QVBoxLayout()
        self.hlayout = QHBoxLayout()
        self.hlayout.addWidget(self.addScheduleButton)
        self.hlayout.addWidget(self.deleteScheduleButton)
        self.hlayout.addStretch()
        self.vlayout.addWidget(self.scheduleTable)
        self.vlayout.addLayout(self.hlayout)
        self.setLayout(self.vlayout)

    ## Make an empty schedule table
    def makeTable(self, current=None):
        self.scheduleTable = QTableWidget(12, 5, self)
        self.scheduleTable.setRowCount(12)
        self.scheduleTable.clear()
	self.updateHeaders()
        self.scheduleTable.setAlternatingRowColors(False)
        self.scheduleTable.setEditTriggers(QAbstractItemView.NoEditTriggers)
        self.scheduleTable.setSelectionBehavior(QAbstractItemView.SelectItems)
        self.scheduleTable.setSelectionMode(QAbstractItemView.SingleSelection)
        selected = None

    def updateHeaders(self):
        self.scheduleHorizontalHeaderList = QStringList()        
	self.scheduleHorizontalHeaderList.append(self.trUtf8("Monday"))
        self.scheduleHorizontalHeaderList.append(self.trUtf8("Tuesday"))
        self.scheduleHorizontalHeaderList.append(self.trUtf8("Wednesday"))
        self.scheduleHorizontalHeaderList.append(self.trUtf8("Thursday"))
        self.scheduleHorizontalHeaderList.append(self.trUtf8("Friday"))
        self.scheduleVerticalHeaderList = QStringList()
        for i in range(8, 20):
           self.scheduleVerticalHeaderList.append(self.trUtf8("%i" % i))
        self.scheduleTable.setHorizontalHeaderLabels(self.scheduleHorizontalHeaderList)
        self.scheduleTable.setVerticalHeaderLabels(self.scheduleVerticalHeaderList)
        	   

    ## Add the lessons of the semester to the table
    def updateTable(self, semester):
        self.schedule = getLessonsFromDB(semester)
        rows = len(self.schedule)
        self.scheduleTable.clear()
        for l in range(rows):
            self.addLessonToTable(self.schedule[l])    
        self.scheduleTable.horizontalHeader().setResizeMode(QHeaderView.ResizeToContents)
        self.scheduleTable.verticalHeader().setResizeMode(QHeaderView.ResizeToContents)
	self.updateHeaders()

    ## Add a new lesson to the table
    def addLessonToTable(self, lesson):
        row = lesson.getTime() - 8	
        column = self.getColumn(lesson.getDay())
        code = lesson.getCourse().getCode()
        title = lesson.getCourse().getTitle()
        type = lesson.getType()
        room = lesson.getRoom()
        olditem = self.scheduleTable.item(row, column)
        newtext = "%s\n%s\n%s\n%s" % (code, title, type, room) 	
        if olditem:
            oldtext = olditem.text()
            text = QString(oldtext + "\n" + newtext)
            collision = True
        else:
            text = QString(newtext)
            collision = False
        item = QTableWidgetItem(text)
        item.setBackground(self.getBackground(QString("%s" % type), lesson.getCourse(), collision))
        self.scheduleTable.setItem(row, column, item)

    ## Return the column specified by the day
    def getColumn(self, dayString):
        day = QString("%s" % dayString)	    
        if day.compare(QString(self.trUtf8("Monday"))) == 0:
           return 0
        elif day.compare(QString(self.trUtf8("Tuesday"))) == 0:
           return 1
        elif day.compare(QString(self.trUtf8("Wednesday"))) == 0:
           return 2		
        elif day.compare(QString(self.trUtf8("Thursday"))) == 0:
           return 3		
        elif day.compare(QString(self.trUtf8("Friday"))) == 0:
           return 4
        else:
           return -1	 

    ## Set the right brush and color for the lesson, depending on type of lesson
    def getBackground(self, type, course, collision):
        if type.compare(QString(self.trUtf8("Lecture"))) == 0:
            brush = QBrush(Qt.SolidPattern)
        elif type.compare(QString(self.trUtf8("Assignment lecture"))) == 0:
            brush = QBrush(Qt.Dense2Pattern)
        elif type.compare(QString(self.trUtf8("Assignment help"))) == 0:
            brush = QBrush(Qt.Dense3Pattern)
        elif type.compare(QString(self.trUtf8("Lab"))) == 0:
            brush = QBrush(Qt.Dense1Pattern)
        elif type.compare(QString(self.trUtf8("Seminar"))) == 0:
            brush = QBrush(Qt.Dense4Pattern)
        elif type.compare(QString(self.trUtf8("Other"))) == 0:	    
            brush = QBrush(Qt.Dense5Pattern)
        else:
            brush = QBrush(Qt.NoBrush)
        if not collision:
            brush.setColor(course.getColor())
        else:
            brush.setColor(Qt.red)
        return brush	    


### The Add Lesson dialog
class ScheduleDlg(QDialog):
    
    ## Initialize the Add Lesson dialog
    def __init__(self, parent=None):
        super(ScheduleDlg, self).__init__(parent)

        # Labels
        self.dayLabel = QLabel(self.trUtf8("&Day"))
        self.fromLabel = QLabel(self.trUtf8("&From"))
        self.toLabel = QLabel(self.trUtf8("&To"))
        self.courseLabel = QLabel(self.trUtf8("&Course"))
        self.typeLabel = QLabel(self.trUtf8("Ty&pe"))
        self.roomLabel = QLabel(self.trUtf8("&Room"))
        
        # Widgets
        self.dayEdit = QComboBox()
        self.dayEdit.addItems(getMain().days)
        self.fromEdit = QSpinBox()
        self.fromEdit.setRange(08.15, 18.15)
        self.fromEdit.setSingleStep(01.00)
        self.toEdit = QSpinBox()
        self.toEdit.setRange(09.00, 19.00)
        self.toEdit.setSingleStep(01.00)
        self.courseEdit = QComboBox()
        courses = makeCoursesString()
        coursesStringList = QStringList()
        for course in courses:
            coursesStringList.append(course)		
        self.courseEdit.addItems(coursesStringList)
        self.typeEdit = QComboBox()
        types = [self.trUtf8("Lecture"), self.trUtf8("Assignment lecture"), self.trUtf8("Assignment help"), self.trUtf8("Lab"), self.trUtf8("Seminar"), self.trUtf8("Other")]
        self.typeEdit.addItems(types)
        self.roomEdit = QLineEdit()
        self.buttonBox = QDialogButtonBox(QDialogButtonBox.Ok|QDialogButtonBox.Cancel)
        
        # Buddies
        self.dayLabel.setBuddy(self.dayEdit)
        self.fromLabel.setBuddy(self.fromEdit)
        self.toLabel.setBuddy(self.toEdit)
        self.courseLabel.setBuddy(self.courseEdit)
        self.typeLabel.setBuddy(self.typeEdit)
        self.roomLabel.setBuddy(self.roomEdit)
        
        # Layout
        self.layout = QGridLayout()
        self.layout.addWidget(self.dayLabel, 0, 0)
        self.layout.addWidget(self.fromLabel, 1, 0)
        self.layout.addWidget(self.toLabel, 2, 0)
        self.layout.addWidget(self.courseLabel, 3, 0)
        self.layout.addWidget(self.typeLabel, 4, 0)
        self.layout.addWidget(self.roomLabel, 5, 0)
        self.layout.addWidget(self.dayEdit, 0, 1)
        self.layout.addWidget(self.fromEdit, 1, 1)
        self.layout.addWidget(self.toEdit, 2, 1)
        self.layout.addWidget(self.courseEdit, 3, 1)
        self.layout.addWidget(self.typeEdit, 4, 1)
        self.layout.addWidget(self.roomEdit, 5, 1)
        self.layout.addWidget(self.buttonBox, 6, 0, 1, 2)
        self.setLayout(self.layout)

        # Connect statements 
        self.connect(self.buttonBox, SIGNAL("accepted()"), self, SLOT("accept()"))
        self.connect(self.buttonBox, SIGNAL("rejected()"), self, SLOT("reject()"))
        
        # Set the title
        self.setWindowTitle(self.trUtf8("Add new lesson"))

    ## Accept the dialog and add the specified lesson
    def accept(self):
        day = unicode(self.dayEdit.currentText())
        fromtime = self.fromEdit.value()
        totime = self.toEdit.value()
        courseFull = unicode(self.courseEdit.currentText())
        type = unicode(self.typeEdit.currentText())
        room = unicode(self.roomEdit.text())

        course = getCourseFromDB(getCourseCode(courseFull))
       
        global semester
        for t in range(fromtime, totime):
            addNewLessonToDB(semester, day, t, course, type, room)
            getMain().schedule.addLessonToTable(ScheduleModel(day, t, course, type, room))

        self.close()


### The schedule model
class ScheduleModel():
    
    day = ""
    time = 0
    course = None
    type = ""
    room = ""
    
    ## Initialize the schedule model
    def __init__(self, day, time, course, type, room):
        self.day = day
        self.time = time
        self.course = course
        self.type = type
        self.room = room

    ## Return the day of the lesson
    def getDay(self):
        return self.day
  
    ## Return the start time of the lesson
    def getTime(self):
        return self.time
    
    ## Return the course of the lesson
    def getCourse(self):
        return self.course
    
    ## Return the type of the lesson
    def getType(self):
        return self.type
    
    ## Return the room the lesson is in
    def getRoom(self):
        return self.room


### The Add Course dialog
class CourseDlg(QDialog):
        
    ## Initialize the Add Course dialog
    def __init__(self, parent=None):
        super(CourseDlg, self).__init__(parent)
        
        # The books
        self.books = []

        # Labels
        self.codeLabel = QLabel(self.trUtf8("&Code"))
        self.titleLabel = QLabel(self.trUtf8("&Title"))
        self.shortLabel = QLabel(self.trUtf8("&Short form"))
        self.booksLabel = QLabel(self.trUtf8("&Books"))        

        # Widgets
        self.codeEdit = QLineEdit()
        self.titleEdit = QLineEdit()
        self.shortEdit = QLineEdit()
        self.booksEdit = QListWidget()
        self.updateList()
        self.booksEdit.setSelectionMode(QAbstractItemView.ExtendedSelection)
        self.newBook = QPushButton("Add new book")
        self.buttonBox = QDialogButtonBox(QDialogButtonBox.Ok|QDialogButtonBox.Cancel)

        # Buddies
        self.codeLabel.setBuddy(self.codeEdit)
        self.titleLabel.setBuddy(self.titleEdit)
        self.shortLabel.setBuddy(self.shortEdit)
        self.booksLabel.setBuddy(self.booksEdit)

        # Layout
        self.layout = QGridLayout()
        self.layout.addWidget(self.codeLabel, 0, 0)
        self.layout.addWidget(self.titleLabel, 1, 0)
        self.layout.addWidget(self.shortLabel, 2, 0)
        self.layout.addWidget(self.booksLabel, 3, 0)
        self.layout.addWidget(self.codeEdit, 0, 1)
        self.layout.addWidget(self.titleEdit, 1, 1)
        self.layout.addWidget(self.shortEdit, 2, 1)
        self.layout.addWidget(self.booksEdit, 3, 1)
        self.layout.addWidget(self.newBook, 4, 0)
        self.layout.addWidget(self.buttonBox, 4, 1, 1, 2)
        self.setLayout(self.layout)

        # Connect statements
        self.connect(self.newBook, SIGNAL("pressed()"), getMain().addBook)
        self.connect(getMain(), SIGNAL("newBook"), self.updateList)
        self.connect(self.buttonBox, SIGNAL("accepted()"), self, SLOT("accept()"))
        self.connect(self.buttonBox, SIGNAL("rejected()"), self, SLOT("reject()"))

        # Set the title
        self.setWindowTitle(self.trUtf8("Add new course"))

    ## Update the book list
    def updateList(self):
        self.booksEdit.clear()
        booksDB = getBooksFromDB()
        booksStringList = QStringList()
        for book in booksDB:
		booksStringList.append(book.getAuthor() + u" : " + book.getTitle() + u", " + str(book.getEdition()) + self.trUtf8(". edition"))
        self.booksEdit.addItems(booksStringList)
        self.booksEdit.sortItems()	
        	    
    ## Add a new book to the course		   
    def addNewBookToCourse(self):
        book = getBookWithTitleFromDB(booktitle)
        self.books.append(book)	

    ## Accept the dialog and add the specified course
    def accept(self):
        courseCode = unicode(self.codeEdit.text())
        courseTitle = unicode(self.titleEdit.text())
        courseShort = unicode(self.shortEdit.text())	
        courseBooks = self.booksEdit.selectedItems()
        color = getRandomColor()
        global colors
        while color in colors:
            color = getRandomColor()			
        colors.append(color)		
        books = []	
        for book in courseBooks:
            books.append(getBookWithTitleFromDB("%s" % book.text()))
        course = CourseModel(courseCode, courseTitle, courseShort, color, books)
        addNewCourseToDB(courseCode, courseTitle, courseShort, color, books)
        self.close()


### The course model
class CourseModel():

    code = ""
    title = ""
    short = ""
    full = ""
    books = []

    ## Initialize the course model
    def __init__(self, code, title, short, color, books):
        self.code = code
        self.title = title
        self.short = short
        self.setFull(code, title)
        self.color = color
        self.books = books

    ## Return the code of the course
    def getCode(self):
        return self.code

    ## Return the title of the course
    def getTitle(self):
        return self.title

    ## Return the short form of the course
    def getShort(self):
        return self.short

    ## Set the full form of the course
    def setFull(self, code, title):
        self.full = code + ' ' + title

    ## Return the full form of the course
    def getFull(self):
        return self.full

    ## Return the color of the course
    def getColor(self):
        return self.color	    

    ## Add a book to the course
    def addBook(self, book):
        books.append(book)

    ## Return the books of the course
    def getBooks(self):
        return self.books	    


### The Add Book dialog 
class BookDlg(QDialog):
        
    ## Initialize the Add Book dialog
    def __init__(self, parent=None):
        super(BookDlg, self).__init__(parent)

        # Labels
        self.titleLabel = QLabel(self.trUtf8("&Title"))
        self.authorLabel = QLabel(self.trUtf8("&Author"))
        self.editionLabel = QLabel(self.trUtf8("&Edition"))
        self.isbnLabel = QLabel(self.trUtf8("&ISBN"))
        
        # Widgets
        self.titleEdit = QLineEdit()
        self.authorEdit = QLineEdit()
        self.editionEdit = QSpinBox()
        self.editionEdit.setRange(1, 50)
        self.isbnEdit = QLineEdit()
        self.buttonBox = QDialogButtonBox(QDialogButtonBox.Ok|QDialogButtonBox.Cancel)

        # Buddies
        self.titleLabel.setBuddy(self.titleEdit)
        self.authorLabel.setBuddy(self.authorEdit)
        self.editionLabel.setBuddy(self.editionEdit)
        self.isbnLabel.setBuddy(self.isbnEdit)
        
        # Layout
        self.layout = QGridLayout()
        self.layout.addWidget(self.titleLabel, 0, 0)
        self.layout.addWidget(self.authorLabel, 1, 0)
        self.layout.addWidget(self.editionLabel, 2, 0)
        self.layout.addWidget(self.isbnLabel, 3, 0)
        self.layout.addWidget(self.titleEdit, 0, 1)
        self.layout.addWidget(self.authorEdit, 1, 1)
        self.layout.addWidget(self.editionEdit, 2, 1)
        self.layout.addWidget(self.isbnEdit, 3, 1)
        self.layout.addWidget(self.buttonBox, 4, 0, 1, 2)
        self.setLayout(self.layout)

        # Connect statements 
        self.connect(self.buttonBox, SIGNAL("accepted()"), self, SLOT("accept()"))
        self.connect(self.buttonBox, SIGNAL("rejected()"), self, SLOT("reject()"))
        
        # Set the title
        self.setWindowTitle(self.trUtf8("Add new book"))

    # Accept the dialog and add the specified book
    def accept(self):
        bookTitle = unicode(self.titleEdit.text())
        bookAuthor = unicode(self.authorEdit.text())
        bookEdition = self.editionEdit.value()
        bookIsbn = unicode(self.isbnEdit.text())
        addNewBookToDB(bookIsbn, bookTitle, bookAuthor, bookEdition)	
        getMain().emit(SIGNAL("newBook"))
        self.close()


### The book model
class BookModel():

    title = ""
    author = ""
    edition = 0
    isbn = ""

    ## Initialize the book model
    def __init__(self, isbn, title, author, edition):
        self.isbn = isbn
        self.title = title
        self.author = author
        self.edition = edition

    # Return the ISBN number of the book
    def getIsbn(self):
        return self.isbn

    # Return the title of the book
    def getTitle(self):
        return self.title

    # Return the author(s) of the book
    def getAuthor(self):
        return self.author

    # Return the edition of the book
    def getEdition(self):
        return self.edition


# Database 

# Initialization

## Connect to the database and return the cursor and connection
def initDB():
    if 'HOME' in os.environ:
        home = os.environ['HOME']
    else:
        home = ""
    path = home+"/.egon/egon.db"
    conn = sqlite.connect(path)
    cursor = conn.cursor()

    cursor.execute('''
        SELECT name FROM sqlite_master
        WHERE type='table'
        ORDER BY name
     ''')

    if cursor.fetchall() == []:
        initSemesterDB(cursor)
        initAssignmentDB(cursor)
        initReadingDB(cursor)
        initScheduleDB(cursor)
        initBookDB(cursor)
        initCourseDB(cursor)
        initCourseUsesBook(cursor)

    return cursor, conn

    exitDB(conn)

# Create the database

## Create the Semester table
def initSemesterDB(cursor):
    cursor.execute('''
        CREATE TABLE Semester (
            term TEXT,
            year INT,
            PRIMARY KEY (term, year)
        )
    ''')

## Create the Assignment table
def initAssignmentDB(cursor):
    cursor.execute('''
        CREATE TABLE Assignment (
            date DATETIME,
            course TEXT,
            number INT,
            description TEXT,
            status TEXT,
            term TEXT,
            year INT,	    
            PRIMARY KEY (course, number)
        )
    ''')

## Create the Reading table
def initReadingDB(cursor):
    cursor.execute('''
        CREATE TABLE Reading (
            week INT,
            course TEXT,
            book INT,
            chapter TEXT,
            pages TEXT,
            done BOOLEAN,	    
            term TEXT,
            year INT,	    
            PRIMARY KEY (week, course, book, chapter)
        )
    ''')

## Create the Lesson table
def initScheduleDB(cursor):
    cursor.execute('''
        CREATE TABLE Lesson (
            day TEXT,
            time INT,
            course TEXT,
            type TEXT,
            room TEXT,
            term TEXT,
            year INT,	    
            PRIMARY KEY (course, day, time)
        )
    ''')

## Create the Course table
def initCourseDB(cursor):
    cursor.execute('''
        CREATE TABLE Course (
            code TEXT PRIMARY KEY,
            title TEXT,
            short TEXT,
            red INT, 
            green INT,
            blue INT	    
        )
    ''')

## Create the Book table
def initBookDB(cursor):
    cursor.execute('''
        CREATE TABLE Book (
            isbn TEXT PRIMARY KEY,
            title TEXT,
            author TEXT,
            edition INTEGER
        )
    ''')

## Create the Course-Book relation
def initCourseUsesBook(cursor):
    cursor.execute('''
        CREATE TABLE CourseUsesBook (
            courseCode TEXT,
            bookIsbn TEXT,
            PRIMARY KEY (courseCode, bookIsbn)
        )
    ''')

# Add things to the database

## Add new semester to the database
def addNewSemesterToDB(term, year):
    cursor, conn = initDB()
        
    cursor.execute('''
        INSERT INTO Semester (term, year)
        VALUES (?, ?)	
    ''', (term, year))

    exitDB(conn)

## Add new assignment to the database
def addNewAssignmentToDB(semester, datetime, course, number, description, status):
    cursor, conn = initDB()

    day = datetime.date().day()
    month = datetime.date().month()
    year = datetime.date().year()
    hour = datetime.time().hour()
    minute = datetime.time().minute()
    timestring = "%02i-%02i-%02i %02i:%02i" % (year, month, day, hour, minute)
    term = "%s" % semester.getTerm()
    year = semester.getYear() 

    cursor.execute('''
        INSERT INTO Assignment (date, course, number, description, status, term, year)
        VALUES (datetime(?), ?, ?, ?, ?, ?, ?)
    ''', (timestring, course.getCode(), number, description, status, term, year))

    exitDB(conn)

## Add new reading to the database
def addNewReadingToDB(semester, week, course, book, chapter, pages, done):
    cursor, conn = initDB()

    term = "%s" % semester.getTerm()
    year = semester.getYear() 

    cursor.execute('''
        INSERT INTO Reading (week, course, book, chapter, pages, done, term, year)
        VALUES (?, ?, ?, ?, ?, ?, ?, ?)	
    ''', (week, course.getCode(), book.getIsbn(), chapter, pages, done, term, year))

    exitDB(conn)

## Add new lesson to the database
def addNewLessonToDB(semester, day, time, course, type, room):
    cursor, conn = initDB()

    term = "%s" % semester.getTerm()
    year = semester.getYear() 

    cursor.execute('''
        INSERT INTO Lesson (day, time, course, type, room, term, year)
        VALUES (?, ?, ?, ?, ?, ?, ?)	
    ''', (day, time, course.getCode(), type, room, term, year))

    exitDB(conn)

## Add new course to the database
def addNewCourseToDB(code, title, short, color, books):
    cursor, conn = initDB()
   
    red = color.red()
    green = color.green()
    blue = color.blue()    

    cursor.execute('''
        INSERT INTO Course (code, title, short, red, green, blue)
        VALUES (?, ?, ?, ?, ?, ?)
    ''', (code, title, short, red, green, blue))
    
    for book in books:
        cursor.execute('''
            INSERT INTO CourseUsesBook (courseCode, bookIsbn)
            VALUES (?, ?)	    
        ''', (code, book))

    exitDB(conn)

## Add new book to the database
def addNewBookToDB(isbn, title, author, edition):
    cursor, conn = initDB()
    
    cursor.execute('''
        INSERT INTO Book 
        VALUES (?, ?, ?, ?)
    ''', (isbn, title, author, edition))
    
    exitDB(conn)

# Get things from the database

## Get all the semesters form the database
def getSemestersFromDB():
    cursor, conn = initDB()
  
    cursor.execute('''
        SELECT * 
        FROM Semester	
    ''')

    semesters = []
    for row in cursor.fetchall():
        semesters.append(SemesterModel(row[0], row[1]))	    

    exitDB(conn)

    return semesters

## Get the assignments of the specified semester from the database
def getAssignmentsFromDB(semester):
    cursor, conn = initDB()

    term = "%s" % semester.getTerm()
    year = (semester.getYear())

    cursor.execute('''
        SELECT * 
        FROM Assignment	
        WHERE term = ?
        AND year = ?	
    ''', (term, year))

    assignments = []
    for row in cursor.fetchall():
        assignments.append(AssignmentModel(getQDateTime(row[0]), getCourseFromDB(row[1]), row[2], row[3], row[4]))

    exitDB(conn)

    return assignments

## Get the readings of the specified semester from the database
def getReadingsFromDB(semester):
    cursor, conn = initDB()

    term = "%s" % semester.getTerm()
    year = semester.getYear() 

    cursor.execute('''
        SELECT * 
        FROM Reading
        WHERE term = ?
        AND year = ?	
    ''', (term, year))

    readings = []
    for row in cursor.fetchall():
        readings.append(ReadingModel(row[0], getCourseFromDB(row[1]), getBookFromDB(row[2]), row[3], row[4], row[5]))

    exitDB(conn)

    return readings

## Get the lessons of the specified semester from the database
def getLessonsFromDB(semester):
    cursor, conn = initDB()

    term = "%s" % semester.getTerm()
    year = semester.getYear()

    cursor.execute('''
        SELECT * 
        FROM Lesson
        WHERE term = ?
        AND year = ?	
    ''', (term, year))

    lessons = []
    for row in cursor.fetchall():
        lessons.append(ScheduleModel(row[0], row[1], getCourseFromDB(row[2]), row[3], row[4]))

    exitDB(conn)

    return lessons

## Get all the courses from the database
def getCoursesFromDB():
    cursor, conn = initDB()

    cursor.execute('''
        SELECT *
        FROM Course
    ''')

    courses = []
    for row in cursor.fetchall():
        courses.append(CourseModel(row[0], row[1], row[2], QColor(row[3], row[4], row[5]), []))

    for course in courses:
        cursor.execute('''
            SELECT bookIsbn 
            FROM CourseUsesBook	
            WHERE courseCode = ?
        ''', (course.getCode(),))
        fetched = cursor.fetchall()
        for fetchedRow in fetched:
            cursor.execute('''
                SELECT *
                FROM Book
                WHERE isbn = ?		
            ''', (fetchedRow[0],))
            for row in cursor:
                course.addBook(BookModel(row[0], row[1], row[2], row[3]))

    return courses

## Get the course specified by the course code from the database
def getCourseFromDB(courseCode):
    cursor, conn = initDB()

    cursor.execute('''
        SELECT * 
        FROM Course
        WHERE code = ?	
    ''', (courseCode,))

    course = None

    for row in cursor.fetchall():
        course = CourseModel(row[0], row[1], row[2], QColor(row[3], row[4], row[5]), [])

    cursor.execute('''
        SELECT bookIsbn 
        FROM CourseUsesBook
        WHERE courseCode = ?	
    ''', (courseCode,))
    fetched = cursor.fetchall()
    for fetchedRow in fetched:
        cursor.execute('''
            SELECT *
            FROM Book
            WHERE isbn = ?	    
        ''', (fetchedRow[0],))
        for row in cursor:
            course.addBook(BookModel(row[0], row[1], row[2], row[3]))		

    exitDB(conn)

    return course

## Get all the books from the database
def getBooksFromDB():
    cursor, conn = initDB()

    cursor.execute('''
        SELECT * 
        FROM Book
    ''')

    books = []
    for row in cursor.fetchall():
        books.append(BookModel(row[0], row[1], row[2], row[3])) 
       	    
    exitDB(conn)
    
    return books

## Get the book specified by the ISBN number from the database
def getBookFromDB(isbn):
    cursor, conn = initDB()

    cursor.execute('''
        SELECT * 
        FROM Book
        WHERE isbn = ?	
    ''', (isbn,))
    
    for row in cursor.fetchall():
        book = BookModel(row[0], row[1], row[2], row[3])

    exitDB(conn)

    return book	

## Get the book specified by the title from the database
def getBookWithTitleFromDB(booktitle):
    cursor, conn = initDB()

    book = "%s" % booktitle

    cursor.execute('''
        SELECT * 
        FROM Book
        WHERE title = ?	
    ''', (book,))

    for row in cursor.fetchall():
        book = BookModel(row[0], row[1], row[2], row[3])	    

    exitDB(conn)

    return book

# Update things in the database

## Update the completion level of the specified assignment
def updateAssignmentCompletion(coursecode, num, completion):
    cursor, conn = initDB()

    status = "%s" % completion
    course = "%s" % coursecode
    number = (num.toInt())[0]

    cursor.execute('''
        UPDATE Assignment
        SET complete = ? 
        WHERE course = ?
        AND number = ?	
    ''', (status, course, number))

    exitDB(conn)

## Update whether the specified reading is done or not
def updateReadingDone(week, coursecode, bookisbn, chapter, done):
    cursor, conn = initDB()

    course = "%s" % coursecode
    book = "%s" % bookisbn
    ch = "%s" % chapter

    cursor.execute('''
        UPDATE Reading
        SET done = ?
        WHERE week = ?
        AND course = ?
        AND book = ?	
	AND chapter = ?
    ''', (done, week, course, book, ch))    

    exitDB(conn)    

# Remove things from the database

## Remove the specified assignment from the database
def removeAssignmentFromDB(coursecode, num):
    cursor, conn = initDB()
    
    course = "%s" % coursecode
    number = (num.toInt())[0]

    cursor.execute('''
        DELETE
        FROM Assignment
        WHERE course = ?
        AND number = ?	
    ''', (course, number))

    exitDB(conn)

## Remove the specified reading from the database
def removeReadingFromDB(week, coursecode, bookisbn, chapter):
    cursor, conn = initDB()

    course = "%s" % coursecode
    book = "%s" % bookisbn
    ch = "%s" % chapter

    cursor.execute('''
        DELETE
        FROM Reading
        WHERE week = ?
        AND course = ?
        AND book = ?	
	AND chapter = ?
    ''', (week, course, book, ch))

    exitDB(conn)

## Remove the specified lesson from the database
def removeLessonFromDB(daystring, coursecode, fromTime):
    cursor, conn = initDB()

    day = "%s" % daystring
    course = "%s" % coursecode
    time = "%s" % fromTime

    cursor.execute('''
        DELETE
        FROM Lesson
        WHERE day = ?
        AND course = ?
        AND time = ?	
    ''', (day, course, time))

    exitDB(conn)

# Exit the database

## Commit and close the connection
def exitDB(conn):
    conn.commit()
    conn.close()

# Course

## Get the course code from the full name of the course
def getCourseCode(courseFull):
    course = courseFull.split(' ')
    return course[0]

## Add a new course to the list of courses
def addNewCourse(course):
    courses.append(course)
    addNewCourseToDB(course.getCode(), course.getTitle(), course.getShort(), course.getColor(), course.getBooks())
    addNewCourseString(course)

## Return the list of courses
def getCourses():
    global courses
    return courses

## Add the course as a course string
def addNewCourseString(course):
    global coursesString
    coursesString.append(course.getFull())

## Make the courses string list and return it
def makeCoursesString():
    emptyCourses()
    cs = getCoursesFromDB()
    if cs:
        for c in cs:
            addNewCourseString(c)
    s = getCoursesString()	  
    return s

## Return the courses string list
def getCoursesString():
    global coursesString	
    return coursesString

## Empty the courses list and the courses string list    
def emptyCourses():
    global courses
    global coursesString
    courses = []
    coursesString = []

# Book

## Add a new book to the list of books
def addNewBook(book):
    books.append(book)
    addNewBookToDB(book.getISBN(), book.getTitle(), book.getAuthor(), book.getEdition(), book.getCourse())
    addNewBookString(book)

## Return the list of books
def getBooks():
    global books
    return books

## Add the book as a book string
def addNewBookString(book):
    global booksString
    booksString.append(book.getTitle())

## Make the books string list and return it
def makeBooksString():
    emptyBooks()
    bs = getBooksFromDB()
    if bs:
        for b in bs:
            addNewBookString(b)   
    s = getBooksString()
    return s

## Return the books string list
def getBooksString():
    global booksString
    return booksString
       
## Empty the books list and the books string list      
def emptyBooks():
    global books
    global booksString
    books = []
    booksString = []

# Color

## Return a random color, RGB
def getRandomColor():
    return QColor(getRandomColorPart(), getRandomColorPart(), getRandomColorPart())

## Return a random number between 0 and 255
def getRandomColorPart():
    return random.random()*256		    

# General

## Convert a SQL timestamp to a QDateTime object
def getQDateTime(timestamp):
    if not timestamp:
        return None		
    datetimeList = timestamp.split()
    dateString = datetimeList[0]
    timeString = datetimeList[1]
    dateList = dateString.split('-')
    timeList = timeString.split(':')
    year = string.atoi(dateList[0])
    month = string.atoi(dateList[1])
    day = string.atoi(dateList[2])
    hour = string.atoi(timeList[0])
    minute = string.atoi(timeList[1])
    date = QDate(year, month, day)
    time = QTime(hour, minute)
    datetime = QDateTime(date, time)
    return datetime

## Return the main window
def getMain():
    global main
    return main    

## Run the program
def main():
    app = QApplication(sys.argv)
    locale = QLocale.system().name()
    qtTranslator = QTranslator()
    if qtTranslator.load("qt_" + locale, ":/"):
        app.installTranslator(qtTranslator)
    appTranslator = QTranslator()
    if appTranslator.load("imagechanger_" + locale, ":/"):
        app.installTranslator(appTranslator)

    form = MainWindow()
    app.setOrganizationName("PVV")
    app.setOrganizationDomain("pvv.ntnu.no")
    app.setApplicationName(form.title)
    form.show()
    app.exec_()


main()
#initNewDB()