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

def create_goban_size_dropdown_list(listname):
	"""
	gets a name, returns a string with a html form for selecting the goban size.
	"""
	data = """
	<select name="%s">
	<option> 9 </option>
	<option> 13 </option>
	<option> 19 </option>
	</select>
	""" % listname
	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:
			httptools.redirect("/login")

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


		data = helper.header()
		p1data = create_user_dropdown_list("player1",username)
		p2data = create_user_dropdown_list("player2")
		gobansize = create_goban_size_dropdown_list("gobansize")
		#start form
		#choose player one (black),choose player two (white),choose goban size
		data += """
		<form  method="post">
		<p>Player One (Black): %s </p>
		<p>Player Two (White): %s </p>
		<p>Goban Size: %s fields </p>
		<p>Optional name for game: <input type="text" name="description" size="20" class="text"></p>
		<input type="submit" class="submit" value="create game">
		</form>
		""" % (p1data,p2data,gobansize)
		data += helper.footer()
		return data
		
	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"]
		
		data = helper.header()
		#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.
					#print error msg
					data += "Error: No free game slots for player %s!<br>" % player
					#display form again
					return self.display_game_creation_form()
			
			httptools.redirect("/overview")
		else:
			#give error message
			data += "Sorry, you must be one of the players!<br>"
			#display form again
			return self.display_game_creation_form()
	
		data+=helper.footer(req,form)
		return data
	index.exposed = True