from mod_python import *
import psql,helper

def display_game_creation_form(req,sessionid,username):
	"""
	prints a html form with multiple drop-down lists for choosing players,
	goban size and so on.
	gets a mod_python request, prints to req.write.
	"""
	data = helper.header()
	p1data = create_user_dropdown_list("playerone",username)
	p2data = create_user_dropdown_list("playertwo")
	gobansize = create_goban_size_dropdown_list("gobansize")
	#start form
	#choose player one (black)
	#choose player two (white)
	#choose goban size
	#'hidden' session id and username
	data += """
	<form  method="post">
	<p>Player One (Black): %s </p>
	<p>Player Two (White): %s </p>
	<p>Goban Size: %s fields </p>
	<input type="hidden" name="sessionid" value="%s"><p>
	<input type="hidden" name="username" value="%s"><p>
	<input type="submit" value="create game"></p>
	</form>
	""" % (p1data,p2data,gobansize,sessionid,username)


	
	data+=helper.footer()
	req.write(data)

def process_creation_form(req):
	"""
	validates and processes the game creation form. 
	If everything was ok, a game will be created.
	"""
	#check if at least one of the players is the current user
	#create game name
	#create_game
	#update entries for player one and player two
	pass

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 = psql.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

def main(req,form):
	"""
	display and process forms for game creation.
	gets a request object and a util.FieldStorage form.
	returns nothing.
	"""
	username 	= form["username"]
	#TODO:check if valid session id
	sessionid 	= form["sessionid"] 
	if "create" in form.keys():	#first call of this function
		display_game_creation_form(req,sessionid,username)
	else:
		process_creation_form(req)
	form = util.FieldStorage(req)
	req.write(str(form))