webgo/gamecreation.py

import helper,login,database
from cherrypy import cpg
from cherrypy.lib import httptools




def create_user_dropdown_list(listname,selected = ""):
	"""
	gets a name for the generated list and, optionally, the preselected value.
	returns a <select> form as string.
	"""
	userlist = database.get_users_with_free_game_slots()
	data = '<select name="%s">' % listname
	for item in userlist:
		#check whether current item = item for preselection
		if item == selected:
			tmp = 'selected'
		else:
			tmp = ''
		data += '<option %s> %s </option>' % (tmp,item)
	data += '</select>'
	return data

class GameCreation:
	"""
	manages the creation of games.
	"""
	def index(self,player1 = None, player2 = None, description = None,gobansize = None):
		username = cpg.request.sessionMap["username"]
		myuser = database.Users.byUsername(username)
		sessionid = cpg.request.sessionMap["_sessionId"]
		if myuser.sessionid == sessionid:
			if player1 != None and player2 != None and gobansize != None:
				return self.process_creation_form(player1,player2,gobansize,description)
			else:
				return self.display_game_creation_form()
				
		else:
			return helper.cs_render("templates/not_logged_in.cs")

	def display_game_creation_form(self, message = ""):
		"""
		prints a html form with multiple drop-down lists for choosing players,
		goban size and so on.
		TODO: authentication?
		"""
		username = cpg.request.sessionMap["username"]
		myuser = database.Users.byUsername(username)
		sessionid = cpg.request.sessionMap["_sessionId"]



		#p1data = create_user_dropdown_list("player1",username)
		#p2data = create_user_dropdown_list("player2")

		settings = {}
		settings["Data.Message"] = message
		userlist = database.get_users_with_free_game_slots()
		i = 0
		for item in userlist:
			settings["Data.Userlist.%d" % i] = item
			i += 1
		
		settings["Data.Username"] = username
		
		return helper.cs_render("templates/gamecreation.cs",settings)
		
	def process_creation_form(self,player1,player2,gobansize,description=None):
		"""
		validates and processes the game creation form. 
		If everything was ok, a game will be created.
		TODO: change this function, so that the original database state canbe 
		restored, if for example one of the users does not have a free game slot.
		"""
		username = cpg.request.sessionMap["username"]
		myuser = database.Users.byUsername(username)
		sessionid = cpg.request.sessionMap["_sessionId"]
		
		#check if at least one of the players is the current user
		if (player1 == username) or (player2 == username):
			#create game
			mygame = database.GobanTable(player1=player1,player2=player2,size=gobansize,description = description)
			gamename = mygame.id
			#update entries for player one and player two
			for player in [player1,player2]:
				myplayer = database.Users.byUsername(player)
				if myplayer.free_slot_left:
					myplayer.add_game(gamename)
				else:#should not happen: no free game slot.
					#display form with  error msg
					return self.display_game_creation_form("Error: No free game slots for player %s!<br>" % player)
			
			httptools.redirect("/overview")
		else:#display form with  error msg
			return self.display_game_creation_form("Sorry, but you must be one of the players!<br>")
	
	index.exposed = True