402 lines
11 KiB
Python
402 lines
11 KiB
Python
from helpers import *
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exit_commands = ['exit', 'abort', 'quit']
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class ExitMenu(Exception):
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pass
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class Menu():
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def __init__(self, name, items=[], prompt='> ', exit_msg=None):
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self.name = name
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self.items = items
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self.prompt = prompt
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self.exit_msg = exit_msg
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def at_exit(self):
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if self.exit_msg:
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print self.exit_msg
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def item_is_submenu(self, i):
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return isinstance(self.items[i], Menu)
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def item_name(self, i):
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if self.item_is_submenu(i):
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return self.items[i].name
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else:
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return str(self.items[i])
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def input_str(self, prompt=None):
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if prompt == None:
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prompt = self.prompt
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try:
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result = raw_input(prompt)
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except EOFError:
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print 'quit'
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raise ExitMenu()
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if result in exit_commands:
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raise ExitMenu()
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return result
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def input_int(self, prompt=None, allowed_range=(None,None)):
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if prompt == None:
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prompt = self.prompt
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while True:
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result = self.input_str(prompt)
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try:
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value = int(result)
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if ((allowed_range[0] and value < allowed_range[0]) or
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(allowed_range[1] and value > allowed_range[1])):
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if allowed_range[0] and allowed_range[1]:
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print 'Value must be in range [%d,%d]' % allowed_range
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elif allowed_range[0]:
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print 'Value must be at least %d' % allowed_range[0]
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else:
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print 'Value must be at most %d' % allowed_range[1]
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else:
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return value
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except ValueError:
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print 'Please enter an integer'
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def input_user(self, prompt=None):
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user = None
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while user == None:
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user = retrieve_user(self.input_str(prompt),
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self.session)
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return user
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def input_product(self, prompt=None):
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product = None
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while product == None:
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product = retrieve_product(self.input_str(prompt),
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self.session)
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return product
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def input_thing(self, prompt=None, permitted_things=('user','product'),
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empty_input_permitted=False):
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result = None
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while result == None:
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search_str = self.input_str(prompt)
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if search_str == '' and empty_input_permitted:
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return None
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result = self.search_for_thing(search_str, permitted_things)
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return result
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def search_for_thing(self, search_str, permitted_things=('user','product')):
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search_fun = {'user': search_user,
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'product': search_product}
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results = {}
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result_values = {}
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for thing in permitted_things:
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results[thing] = search_fun[thing](search_str, self.session)
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result_values[thing] = self.search_result_value(results[thing])
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selected_thing = argmax(result_values)
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return search_ui2(search_str, results[selected_thing],
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selected_thing, self.session)
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def search_result_value(self, result):
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if result == None:
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return 0
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if not isinstance(result, list):
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return 3
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if len(result) == 0:
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return 0
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if len(result) == 1:
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return 2
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return 1
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def print_header(self):
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print
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print '[%s]' % self.name
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def pause(self):
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self.input_str('.')
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def execute(self):
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try:
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return self._execute()
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except ExitMenu:
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self.at_exit()
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return None
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def _execute(self):
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while True:
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self.print_header()
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if len(self.items)==0:
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print '(empty menu)'
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self.pause()
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return None
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for i in range(len(self.items)):
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print '%d ) %s' % (i+1, self.item_name(i))
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item_i = self.input_int(self.prompt, (1,len(self.items)))-1
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if self.item_is_submenu(item_i):
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self.items[item_i].execute()
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else:
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return item_i
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class Selector(Menu):
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def print_header(self):
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print self.name
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def _execute(self):
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result = Menu._execute(self)
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if result != None:
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return self.items[result]
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return None
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class ChargeMenu(Menu):
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def __init__(self):
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self.name = "Add credits to a user account"
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def execute(self):
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self.session = Session()
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amount = self.input_int('Amount to be added> ')
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user = self.input_user('To user>')
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t = Transaction(user, -amount, 'Add '+str(amount)+' to user '+user.name)
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t.perform_transaction()
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self.session.add(t)
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self.session.commit()
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print 'Added %d kr to user %s\'s account' % (amount, user.name)
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print 'User %s\'s credit is now %d kr' % (user,user.credit)
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self.session.close()
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self.pause()
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class TransferMenu(Menu):
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def __init__(self):
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Menu.__init__(self, 'Transfer credit between users')
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def _execute(self):
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self.print_header()
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self.session = Session()
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amount = self.input_int('Transfer amount> ')
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user1 = self.input_user('From user> ')
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user2 = self.input_user('To user> ')
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t1 = Transaction(user1, amount,
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'Transfer to '+user2.name)
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t2 = Transaction(user2, -amount,
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'Transfer from '+user1.name)
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t1.perform_transaction()
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t2.perform_transaction()
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self.session.add(t1)
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self.session.add(t2)
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self.session.commit()
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print 'Transfered %d kr from %s to %s' % (amount, user1, user2)
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print 'User %s\'s credit is now %d kr' % (user1, user1.credit)
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print 'User %s\'s credit is now %d kr' % (user2, user2.credit)
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self.session.close()
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self.pause()
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class ShowUserMenu(Menu):
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def __init__(self):
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Menu.__init__(self, 'Show user')
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def _execute(self):
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self.session = Session()
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self.print_header()
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user = self.input_user('User name or card number> ')
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print 'User name: %s' % user.name
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print 'Card number: %s' % user.card
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print 'Credit: %s' % user.credit
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self.print_transactions(user)
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self.pause()
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def print_transactions(self, user):
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if len(user.transactions) == 0:
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print 'No transactions'
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return
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print 'Transactions:'
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for t in user.transactions:
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string = ' * %s: %d kr, ' % \
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(t.time.strftime('%Y-%m-%d %H:%M'), t.amount)
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if t.purchase:
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string += 'purchase ('
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string += ', '.join(map(lambda e: e.product.name,
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t.purchase.entries))
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string += ')'
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else:
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string += t.description
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print string
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class BuyMenu(Menu):
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def __init__(self):
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Menu.__init__(self, 'Buy')
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def _execute(self):
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self.print_header()
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self.session = Session()
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self.purchase = Purchase()
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while True:
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self.print_purchase()
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print {(False,False): 'Enter user or product identification',
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(False,True): 'Enter user identification or more products',
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(True,False): 'Enter product identification or more users',
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(True,True): 'Enter more products or users, or an empty line to confirm'
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}[(len(self.purchase.transactions) > 0,
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len(self.purchase.entries) > 0)]
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thing = self.input_thing(empty_input_permitted=True)
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if thing == None:
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if not self.complete_input():
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if confirm('Not enough information entered. Abort purchase? (y/n) '):
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return False
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continue
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break
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if isinstance(thing, User):
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Transaction(thing, purchase=self.purchase)
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elif isinstance(thing, Product):
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PurchaseEntry(self.purchase, thing, 1)
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# for user in self.users:
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# Transaction(user, purchase=self.purchase)
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# for product in self.products:
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# PurchaseEntry(self.purchase, product, 1)
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self.purchase.perform_purchase()
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self.session.add(self.purchase)
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self.session.commit()
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print 'Purchase stored.' # TODO print info about purchase
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self.print_purchase()
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for t in self.purchase.transactions:
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print 'User %s\'s credit is now %d kr' % (t.user.name, t.user.credit)
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self.session.close()
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self.pause()
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return True
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def complete_input(self):
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return self.purchase.is_complete()
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def format_purchase(self):
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self.purchase.set_price()
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transactions = self.purchase.transactions
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entries = self.purchase.entries
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if len(transactions) == 0 and len(entries) == 0:
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return None
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string = 'Purchase:'
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string += '\n buyers: '
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if len(transactions) == 0:
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string += '(empty)'
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else:
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string += ', '.join(map(lambda t: t.user.name, transactions))
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string += '\n products: '
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if len(entries) == 0:
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string += '(empty)'
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else:
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string += ', '.join(map(lambda e: '%s (%d kr)'%(e.product.name, e.product.price),
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entries))
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if len(transactions) > 1:
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string += '\n price per person: %d kr' % self.purchase.price_per_transaction()
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string += '\n total price: %d kr' % self.purchase.price
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return string
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def print_purchase(self):
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info = self.format_purchase()
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if info != None:
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print info
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class ProductListMenu(Menu):
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def __init__(self):
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Menu.__init__(self, 'Product list')
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def _execute(self):
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self.print_header()
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session = Session()
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product_list = session.query(Product).all()
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line_format = '%-20s %6s %-15s'
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print line_format % ('name', 'price', 'bar code')
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for p in product_list:
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print line_format % (p.name, p.price, p.bar_code)
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self.pause()
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class AddProductMenu(Menu):
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def __init__(self):
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Menu.__init__(self, 'Add product')
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def _execute(self):
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name = self.input_str('Product name> ')
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bar_code = self.input_int('Bar code> ')
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price = self.input_int('Price> ')
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product = Product(bar_code,name,price)
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session = Session()
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session.add(product)
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session.commit()
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session.close()
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print 'Added product %s, price %d, bar code %d' % (name,price,bar_code)
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self.pause()
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#class MainMenu():
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# def __init__(self):
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# self.menu_list = [Menu("Buy"),ChargeMenu(), Menu("Add User"), Menu("Add Product")]
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# def execute(self):
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# while 1:
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# print "Main Menu: \nWhat do you want to do? \n"
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# for i in range(len(self.menu_list)):
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# print i+1," ) ",self.menu_list[i].name
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# result = raw_input('\nEnter a number corresponding to your action, or "exit" to exit \n')
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# if result in ["1","2","3","4"]:
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# self.menu_list[int(result)-1].execute()
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# elif result in ["quit", "exit", "abort"]:
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# print "OK, quitting"
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# break
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# else:
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# print "This does not make sense"
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def dwim_search(string, session):
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typ = guess_data_type(string)
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if typ == None:
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print 'This does not make sense'
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return
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retriever = {'card': retrieve_user,
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'username': retrieve_user,
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'bar_code': retrieve_product,
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'product_name': retrieve_product}
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value_type = {'card': 'user',
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'username': 'user',
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'bar_code': 'product',
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'product_name': 'product'}
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value = retriever[typ](string, session)
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# if value == None:
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# print 'Input "%s" interpreted as %s; no matching %s found.' \
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# % (string, typ, value_type[typ])
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return (value_type[typ], value)
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def search_ui(search_fun, search_str, thing, session):
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result = search_fun(search_str, session)
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return search_ui2(search_str, result, thing, session)
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def search_ui2(search_str, result, thing, session):
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if not isinstance(result, list):
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return result
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if len(result) == 0:
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print 'No %ss matching "%s"' % (thing, search_str)
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return None
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if len(result) == 1:
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msg = 'One %s matching "%s": %s. Use this? (y/n) ' %\
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(thing, search_str, result[0])
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if confirm(msg):
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return result[0]
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return None
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selector = Selector('%d %ss matching "%s":' % (len(result), thing, search_str),
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items=result,
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prompt='select> ')
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return selector.execute()
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def retrieve_user(search_str, session):
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return search_ui(search_user, search_str, 'user', session)
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def retrieve_product(search_str, session):
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return search_ui(search_product, search_str, 'product', session)
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#main = MainMenu()
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main = Menu('Dibbler main menu',
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items=[BuyMenu(), ChargeMenu(), TransferMenu(), Menu('Add user'), AddProductMenu(),
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ShowUserMenu(), ProductListMenu()],
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exit_msg='happy happy joy joy')
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main.execute()
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