#!/usr/bin/python

DEBUG = 1

import sys,string
import cgi
import psql,helper,gnugo

picklefile = "goban.pickledump"

###############################################################################



def display_goban(goban,req,form):
	"""
	gets: dictionary containing the layout of the used goban.
	returns: string containing the HTML code for a clickable goban.
	"""
	data = ""

	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)]
	
	
	data += '\n<p>\n<form method="post">\n'
	data += """<input type="hidden" name="sessionid" value="%s">
	<input type="hidden" name="username" value="%s">
	<input type="hidden" name="game" value="%s">
	""" % (form["sessionid"],form["username"],form["game"])
	
	sgf = psql.get_sgf(form["game"])
	helper.debug(req,form,sgf)
	gobandict = gnugo.parse_static_gnugo_sgf(sgf)
	
	try:
		size = goban["size"]
	except:
		#TODO: proper error management
		raise "[EE] display_goban: got broken goban dictionary."
		sys.exit(1)
	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 id="goban" src="img/topleftline'+stone+'.png" name="('+sx+','+sy+')"\n>'
			elif (x == 1) and (y == size): # upper right
				data += '<input type=image id="goban" src="img/toprightline'+stone+'.png" name="('+sx+','+sy+')"\n><br\n>'
			elif (x == size) and (y == size): # lower right
				data += '<input type=image id="goban" src="img/bottomrightline'+stone+'.png" name="('+sx+','+sy+')"\n><br>\n'	
			elif (x == size) and (y == 1): # lower left
				data += '<input type=image id="goban" src="img/bottomleftline'+stone+'.png" name="('+sx+','+sy+')"\n>'
			elif (y == 1): #left line
				data += '<input type=image id="goban" src="img/leftline'+stone+'.png" name="('+sx+','+sy+')"\n>'
			elif (x == 1): # top line
				data += '<input type=image id="goban" src="img/topline'+stone+'.png" name="('+sx+','+sy+')"\n>'
			elif (y == size): # right line
				data += '<input type=image id="goban" src="img/rightline'+stone+'.png" name="('+sx+','+sy+')"\n><br\n>'
			elif (x == size): #bottom line 
				data += '<input type=image id="goban" src="img/bottomline'+stone+'.png" name="('+sx+','+sy+')"\n>'
			else: # hoshi or empty inner field
				defaultfield = '<input type=image id="goban" src="img/centerline'+stone+'.png" name="('+sx+','+sy+')"\n>'
				#too lazy to make special images for hoshi fields with stones:
				if gobandict[(x,y)] == 1:
					hoshifield = '<input type=image id="goban" src="img/centerline_white.png" name="('+sx+','+sy+')"\n>'
				elif gobandict[(x,y)] == 2:
					hoshifield = '<input type=image id="goban" src="img/centerline_black.png" name="('+sx+','+sy+')"\n>'
				else: #empty hoshi
					hoshifield = '<input type=image id="goban" src="img/hoshi.png" name="('+sx+','+sy+')"\n>'			
				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 += '\n<input type="hidden" name="play" value="foo">'
	data += '\n</form></p>'		
	return data






				
		
def process_form(req,form,gobandict):
	"""
	gets a goban dictionary.
	
	reads out the returned CGI form.
	if the goban has been clicked, return a (x,y) tuple of the position.
	
	"""
	ret = ""
	#if form == empty (which means if page is displayed for the first time):
	if form.keys() != []:
		#cut out the name of the clicked button
		for item in form.keys():
			if string.find(item,").x")>0:
				coordstring =  string.split(item,".x")[0]
		position =  helper.string_to_tuple(coordstring)
		ret = set_stone(gobandict, position,req,form)
	return ret
			
		
def set_stone(gobandict, position,req,form):
	"""gets a goban dictionary and a (x,y)-tuple. Returns a modified goban."""
	size = gobandict["size"]
	name = gobandict["name"]
	turn = gobandict["turn_number"]
	if (gobandict[position] == 0): #empty field
		if gnugo.is_legal(gobandict,position,req,form): #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(req,form,gobandict,position)			
			#write new sgf file into database
			psql.update_goban_table_field(name,"x1","sgf",new_sgf)
			psql.update_turn_number(name,turn+1)
			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."

def update_goban_dict_and_table(gobandict,gobanlite):
	"""
	gets a gobandict and a gobdict light (just coordinates and size).
	updates the fields in gobandict and database.
	returns changed gobandict and True (or False) if something has been changed (or not).
	"""
	tf = False
	for key in gobanlite.keys():
		if gobandict[key] != gobanlite[key]:
			#found difference in dicts.
			#update gobandict
			gobandict[key] = gobanlite[key]
			#update databse table. the only valid difference can be changed goban field positions.
			psql.update_goban_field(gobandict["name"],key[0],key[1],gobandict[key])
			tf = True
	return gobandict,tf


			
###############################################################################

def main(gamename):
	# Print the required header that tells the browser how to render the text.
	#(currently done by error logger)
	#print "Content-Type: text/plain\n\n"
	
	#do stuff
	data = 	helper.header()

	#read goban table from database
	tmplist = psql.read_table(gamename)
	#make a dictionary out of the list
	goban = psql.fetchall_list_to_goban_dict(tmplist)
	#print goban

	(goban,retstring) = process_form(goban)
	data += "<p> Turn number: %s, %s Player's Move.</p>" % (goban["turn_number"],("White","Black")[goban["turn_number"] % 2]) #eleet ;>
	data += display_goban(goban)
	if retstring != "":
		data +="\n<p>"+retstring+"</p>\n"

	
	data += helper.footer()
	print data