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

import os
os.environ['DJANGO_SETTINGS_MODULE']='web.settings'
from web.library.models import *
from web.library.fileformat import read_actionlist, write_actionlist
from django.db.models import Q
from django.db import transaction
from util import *
import getopt
import sys
import types
import traceback
import search
import placement
import tempfile

file_encoding = 'utf8'

def show_book_or_person(ids, commit_format=False, tmp_file=False):
    objects = map(get_book_or_person, ids)
    for i in range(len(ids)):
        if not objects[i]:
            objects[i] = 'No book or person with id %s.\n' % ids[i]
        elif commit_format:
            objects[i] = objects[i].to_dict()
        else:
            objects[i] = objects[i].to_string()
    if commit_format:
        output = write_actionlist(objects)
    else:
        output = '\n'.join(objects)
    if tmp_file:
        filename = write_tmpfile('.'.join(ids), output)
        print filename
        return filename
    else:
        print output.strip()

def get_book_or_person(id):
    books = Book.objects.filter(Q(isbn=id)|Q(id__id=id)).all()
    persons = Person.objects.filter(id=id)
    if len(books) + len(persons) > 1:
        print 'Warning: More than one match for id %d.' % id
        print 'This should not happen.'
    if len(books) > 0:
        return books[0]
    if len(persons) > 0:
        return persons[0]

def remove_duplicates(list):
	d = {}
	for i in list:
		d[i]=None
	return d.keys()

def search_person_cmd(search_strings, search_description=False):
	people = search_person(search_strings, search_description)
	format = '%-20s %-10s %-70s'
	for person in people:
		name = cut_str(person.first_name+' '+person.last_name, 20)
		p_id = cut_str(person.id, 10)
		books = cut_str(', '.join(map(lambda x: x.book.title, person.books.all())), 70)
		print format % (name,p_id,books)

def search_person(search_strings, search_description=False):
	basic_query=Person.objects.select_related('books__book__alt_titles')
	for word in search_strings:
		basic_query=basic_query.filter(Q(first_name__icontains=word) |
		                               Q(last_name__icontains=word) |
					       Q(id__icontains=word) |
					       Q(books__book__isbn__icontains=word) |
					       Q(books__book__title__icontains=word) |
					       Q(books__book__alt_titles__alt_title=word) |
					       Q(books__book__id__id__icontains=word))
	return remove_duplicates(basic_query.all())

def commit(filename=None):
    if filename:
        try:
            f = file(filename, 'r')
            text = f.read()
            f.close()
        except IOError, e:
            print 'commit: Error reading file %s: %s' % (filename, e)
            print 'Exiting.'
            sys.exit(1)
    else:
        text = sys.stdin.read()

    actions = read_actionlist(text)
    commit_actions(actions)

@transaction.commit_manually
def commit_actions(actions):
    # Ensure that creation of new persons is performed first, so that
    # books in the same commit can refer to them:
    def action_cmp(a1, a2):
        if a1['action'] == 'new-person' and a2['action'] != 'new-person':
            return -1
        return cmp(a1, a2)
    actions.sort(action_cmp)

    try:
        for action in actions:
            perform_action(action)
        transaction.commit()
    except Exception, e:
        print 'Error when commiting.'
        print e
        traceback.print_exc()
        transaction.rollback()

def perform_action(a):
    if a['action'] == 'edit-book':
        b = Book.objects.get(isbn=a['isbn'])
        if 'title' in a: b.title = a['title']
        if 'subtitle' in a: b.subtitle = a['subtitle']
        if 'category' in a: b.category = Category.objects.get(id=a['category'])
        if 'publisher' in a: b.publisher = a['publisher']
        if 'published_year' in a: b.published_year = a['published_year']
        if 'edition' in a: b.edition = a['edition']
        if 'num_pages' in a: b.num_pages = a['num_pages']
        if 'series' in a:
            series_lst = BookSeries.objects.filter(Q(id=a['series']))
            if len(series_lst) > 0:
                b.series = series_lst[0]
            else:
                b.series = None
        if 'description' in a: b.description = a['description']
        if 'persons' in a:
            for bp in b.persons.all():
                if bp.person.id not in a['persons'][bp.relation.name]:
                    bp.delete()
            for rel, person_list in a['persons'].items():
                for person_id in person_list:
                    if person_id not in map(lambda p: p.id, b.get_persons(rel)):
                        BookPerson(book=b,
                                   person=Person.objects.get(id=person_id),
                                   relation=Relation.objects.get(name=rel)).save()
        if 'references' in a:
            for ref in b.references.all():
                if ref.text not in a['references'][ref.reference_type]:
                    ref.delete()
            for reftype, text_list in a['references'].items():
                for text in text_list:
                    if text not in map(lambda r: r.text, b.references.all()):
                        Reference(book=b,
                                  reference_type=ReferenceType.objects.get(name=reftype),
                                  text=text).save()
        # TODO pictures
        b.save()

def edit_book_or_person(ids):
    filename = show_book_or_person(ids, commit_format=True, tmp_file=True)
    print filename
    run_editor(filename)
    commit(filename)

commands = { 'show':
             { 'args': [('ids', (1,None))],
               'options': ['commit_format', 'tmp_file'],
               'fun': show_book_or_person },
             'search':
             { 'args': [('search_strings', (1,None))],
               'options': ['search_description'],
               'fun': search.search_book_cmd },
             'search-person':
             { 'args': [('search_strings', (1,None))],
               'options': [],
               'fun': search_person_cmd },
             'commit':
             { 'args': [('filename', (0,1))],
               'options': [],
               'fun': commit },
             'edit':
             { 'args': [('ids', (1,None))],
               'options': [],
               'fun': edit_book_or_person },
	     'map':
	     { 'args': [('shelfname', (0,1)), ('category', (0,1))],
	       'options': [],
	       'fun': placement.print_shelf_cmd }
             }

flags = { 'commit_format':
          { 'help': 'output data in the format expected by the commit command' },
          'tmp_file':
          { 'help': 'output data to a new temporary file instead of to stdout' },
          'search_description':
          { 'help': 'include description field when searching' }
        }

general_options = [] # options applicable to all commands

class BadCommandLine(Exception):
    def __init__(self, msg):
        Exception.__init__(self, 'Bad command line: ' + msg)

def check_command_args(args, command):
    cmd_decl = commands[command]
    min_num_args = sum(map(lambda a: a[1][0], cmd_decl['args']))
    unlimited = any(map(lambda a: a[1][1] == None, cmd_decl['args']))
    if not unlimited:
        max_num_args = sum(map(lambda a: a[1][1], cmd_decl['args']))
    if len(args) < min_num_args:
        raise BadCommandLine('Too few arguments for command %s (expects at least %d, %d given).'
                             % (command, min_num_args, len(args)))
    if (not unlimited) and (len(args) > max_num_args):
        raise BadCommandLine('Too many arguments for command %s (expects at most %d, %d given).'
                             % (command, max_num_args, len(args)))

def check_command_opts(opts, command):
    cmd_decl = commands[command]
    for opt,val in opts:
        if ((opt not in cmd_decl['options']) and
            (opt not in general_options)):
            raise BadCommandLine('Option %s not applicable to command %s.'
                                 % (opt, command))

def assign_command_args(args, command):
    cmd_decl = commands[command]
    d = {}
    i = 0
    for param in cmd_decl['args']:
        pname = param[0]
        pmin = param[1][0]
        pmax = param[1][1]
        if pmax == 1:
            if i < len(args):
                d[pname] = args[i]
                i += 1
            else:
                d[pname] = None
        else:
            d[pname] = []
            j = 0
            while i + j < len(args) and (pmax == None or j < pmax):
                d[pname].append(args[i + j])
                j += 1
            i = i + j
    return d

def assign_command_opts(opts, command):
    d = {}
    for option, value in opts:
        if option in flags:
            d[option] = True
        else:
            d[option] = value
    return d

def parse_cmdline(args):
    def getopt_option_name(internal_name):
        return internal_name.replace('_', '-')
    def internal_option_name(getopt_ret_name):
        return getopt_ret_name[2:].replace('-', '_')

    option_names = map(getopt_option_name, flags)

    options, args = getopt.getopt(args, '', option_names)
    
    if len(args) == 0:
        raise BadCommandLine('No command specified.')
    cmd_name = args[0]
    if cmd_name not in commands:
        raise BadCommandLine('Nonexisting command %s.' % cmd_name)
    cmd_decl = commands[cmd_name]
    cmd_args = args[1:]
    cmd_opts = map(lambda (opt,val): (internal_option_name(opt), val),
                   options)

    check_command_args(cmd_args, cmd_name)
    check_command_opts(cmd_opts, cmd_name)

    return { 'command': cmd_name,
             'args': combine_dicts(assign_command_args(cmd_args, cmd_name),
                                   assign_command_opts(cmd_opts, cmd_name)) }

def invoke_command(command, args):
    cmd_decl = commands[command]
    cmd_decl['fun'](**args)

def combine_dicts(*dicts):
    res = {}
    for d in dicts:
        res.update(d)
    return res

def run_editor(filename):
	if os.path.exists(filename):
		os.system("%s %s || /usr/bin/env vi %s" %(os.getenv("EDITOR"), filename, filename))
	else:
		exit("Error: %s: File does not exist!" % filename)

def write_tmpfile(pfix='', content=''):
    file = tempfile.NamedTemporaryFile(prefix=pfix+'-', dir='/tmp', delete=False)
    file.write(content.encode(file_encoding))
    name = file.name
    file.close()
    return name
    

cmdline_parsed = parse_cmdline(sys.argv[1:])
print 'command line parsed to:', cmdline_parsed
invoke_command(cmdline_parsed['command'],
               cmdline_parsed['args'])