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

DEBUG = 1

def is_my_turn(req,form,gobandict):
	"""
	gets request and util.FiedStorage form.
	check wether or not the current this is the players turn.
	return true or false.
	"""
	me = form["username"]
	player1 = gobandict["player1"]
	player2 = gobandict["player2"]
	play = gobandict["play"]

	if ((player1 == me) and (play == "white")) or ((player2 == me) and (play == "black")):
		return True
	else:
		return False
		

def create_gobandict(req,form,gamename):
	"""
	gets a gamename
	loads sgf, transforms it to dict, writes stuff like player names to dict
	returns dict
	"""
	#read goban sgf  from database
	mygame = database.GobanTable.byName(gamename)
	sgf = mygame.sgf
	gobandict = gnugo.parse_static_gnugo_sgf(sgf)
	gobandict["player1"] = mygame.player1
	gobandict["player2"] = mygame.player2
	gobandict["turn_number"] = mygame.turn_number
	gobandict["name"] = mygame.name
	gobandict["sgf"] = sgf
	return gobandict

def main(req,form):
	"""
	display selected goban and manage user input.
	"""

	try:
		gamename = form["game"]
	except:
		gamename = ""
	if gamename != "":
		data = ""
		req.write(helper.header())
		#helper.debug(req,form,str(form.keys()))		
		gobandict = create_gobandict(req,form,gamename)
		#check if user has already clicked onto a field:
		click_on_field = False
		for item in form.keys():
			if string.find(item,").x") > 0:
				click_on_field = True
		if click_on_field:
			#if yes: is this the user's turn? then process form.
			if is_my_turn(req,form,gobandict):
				helper.debug(req,form,"its my turn , i am going to process the form: --")
				retstring = goban.process_form(req,form,gobandict)
				if retstring != "":
					helper.debug(req,form,"playgame.main says: "+str(retstring))
				else:
					#reload gobandict, it has been changed.
					gobandict = create_gobandict(req,form,gamename)
					
			else:
				helper.debug(req,form,"it's not my turn.")
		data += """<br>Turn number: %s. %s plays.\n
		""" % (str(gobandict["turn_number"]), (string.capitalize(gobandict["play"])))
		
		#check whether its our turn
		#if yes: print 'your move' and display goban and process move
		#if not: print '...s move' and display goban.
		if is_my_turn(req,form,gobandict):
			data += "<br>It's your turn.<br>\n"
		else:
			data += "<br>This is not your turn. You have to wait for the move of the other player.<br>\n"
		#print goban
		data += goban.display_goban(gobandict,req,form)
		data += login.navigation_bar(req,form)
		data += helper.footer(req,form,1)
		req.write(data)
	
	else:
		req.write('Error: You have to select a game to play it!')

class PlayGame:
	"""
	displays a game and processes user input.
	"""
	def index(self,game,coord=None):
		username = cpg.request.sessionMap["username"]
		myuser = database.Users.byUsername(username)
		sessionid = cpg.request.sessionMap["_sessionId"]
		if myuser.sessionid == sessionid:
			if coord != None:
				ret =  self.process_form(game,coord)
				if ret == "":
					return self.display_goban(game)
			else:
				return self.display_goban(game)
				
		else:
			httptools.redirect("/login")

	def display_goban(self,gamename):
		"""
		gets: dictionary containing the layout of the used goban.
		returns: string containing the HTML code for a clickable goban.
		"""
		data = helper.header()
		data += '<div id="board">'
		hoshis19x19 = [(4,4),(4,10),(4,16),(10,4),(10,10),(10,16),(16,4),(16,10),(16,16)]
		hoshis13x13 = [(4,4),(4,10),(7,7),(10,4),(10,10)]
		hoshis9x9 = [(3,3),(3,7),(5,5),(7,3),(7,7)]
	
	
		#TODO: check form[game] before the following asignment
		mygame = database.GobanTable.get(gamename)
		sgf = mygame.sgf
		gobandict = gnugo.parse_static_gnugo_sgf(sgf)
		size = mygame.size

		for x in range(1,size+1):
			for y in range(1,size+1):
				# check for white or black stone
				if gobandict[(x,y)] == 1:
					stone = "_white"
				elif gobandict[(x,y)] == 2:					
					stone = "_black"
				else:
					stone = ""
				sx = str(x)
				sy = str(y)
				# check position:
				if (x == 1) and (y == 1): # upper left
					#data += '<input type=image class="goban" src="/img/topleftline'+stone+'.png" name="coord" value="('+sx+','+sy+')"\n>'
					data += '<a href="/playgame/?coord=%s,%s&game=%s"><img src="/img/topleftline%s.png"\n></a>' % (sx,sy,gamename,stone)
				elif (x == 1) and (y == size): # upper right
					data += '<a href="/playgame/?coord=%s,%s&game=%s"><img src="/img/toprightline%s.png"\n></a><br>' % (sx,sy,gamename,stone)
				elif (x == size) and (y == size): # lower right
					data += '<a href="/playgame/?coord=%s,%s&game=%s"><img src="/img/bottomrightline%s.png"\n></a><br>' % (sx,sy,gamename,stone)
				elif (x == size) and (y == 1): # lower left
					data += '<a href="/playgame/?coord=%s,%s&game=%s"><img src="/img/bottomleftline%s.png"\n></a>' % (sx,sy,gamename,stone)
				elif (y == 1): #left line
					data += '<a href="/playgame/?coord=%s,%s&game=%s"><img src="/img/leftline%s.png"\n></a>' % (sx,sy,gamename,stone)
				elif (x == 1): # top line
					data += '<a href="/playgame/?coord=%s,%s&game=%s"><img src="/img/topline%s.png"\n></a>' % (sx,sy,gamename,stone)
				elif (y == size): # right line
					data += '<a href="/playgame/?coord=%s,%s&game=%s"><img src="/img/rightline%s.png"\n></a><br>' % (sx,sy,gamename,stone)
				elif (x == size): #bottom line 
					data += '<a href="/playgame/?coord=%s,%s&game=%s"><img src="/img/bottomline%s.png"\n></a>' % (sx,sy,gamename,stone)
				else: # hoshi or empty inner field
					defaultfield = '<a href="/playgame/?coord=%s,%s&game=%s"><img src="/img/centerline%s.png"\n></a>' % (sx,sy,gamename,stone)
					#too lazy to make special images for hoshi fields with stones:
					if gobandict[(x,y)] == 1:
						hoshifield = '<a href="/playgame/?coord=%s,%s&game=%s"><img src="/img/centerline_white.png"\n></a>' % (sx,sy,gamename)
					elif gobandict[(x,y)] == 2:
						hoshifield = '<a href="/playgame/?coord=%s,%s&game=%s"><img src="/img/centerline_black.png"\n></a>' % (sx,sy,gamename)
					else: #empty hoshi
						hoshifield = '<a href="/playgame/?coord=%s,%s&game=%s"><img src="/img/hoshi.png"\n></a>' % (sx,sy,gamename)
					if size == 19: # 9 hoshis
						if (x,y) in hoshis19x19:
							data += hoshifield
						else:
							data += defaultfield
					elif size == 13:
						if (x,y) in hoshis13x13:
							data += hoshifield
						else:
							data += defaultfield
					elif size == 9:
						if (x,y) in hoshis9x9:
							data += hoshifield
						else:
							data += defaultfield
		data += '</div>'
		data += helper.footer()
		return data

	def process_form(self,gamename,coord):
		"""
		gets name of a go game, coordinates of user's move.
		processes move.
		"""
		x,y = string.split(coord,",")
		position = (int(x),int(y))
		mygame = database.GobanTable.get(gamename)
		size = mygame.size
		turn = mygame.turn_number
		sgf = mygame.sgf
		gobandict = gnugo.parse_static_gnugo_sgf(sgf)
		gobandict["name"] = gamename
		gobandict["turn_number"] = turn
		gobandict["sgf"] = sgf
		if (gobandict[position] == 0): #empty field
			if gnugo.is_legal(gobandict,position): #gnugo says the move is ok
				#let gnugo make the above move, let gnugo write move to file
				new_sgf = gnugo.make_move_in_sgf(gobandict,position)			
				#write new sgf file into database				
				mygame.sgf = new_sgf
				mygame.turn_number = turn + 1
				mygame.set_time()
				return ""
			else: #move not ok
				return "This is not a legal move (says Gnugo)."
		else: #position not empty
			return "Could not make move: Field not empty."
	index.exposed = True