#!/usr/bin/env python
# -*- encoding: utf-8 -*-
##
## Copyright (C) 2011 Thibaut Girka <thib@sitedethib.com>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published
## by the Free Software Foundation; version 3 only.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##

import sys
import os

import struct
from math import degrees, radians
from itertools import chain

import pygame

from pytouhou.resource.loader import Loader
from pytouhou.game.background import Background
from pytouhou.opengl.texture import TextureManager
from pytouhou.game.game import Game
from pytouhou.game.player import Player

import OpenGL
OpenGL.FORWARD_COMPATIBLE_ONLY = True
from OpenGL.GL import *
from OpenGL.GLU import *


def main(path, stage_num):
    # Initialize pygame
    pygame.init()
    window = pygame.display.set_mode((384, 448), pygame.OPENGL | pygame.DOUBLEBUF)

    # Initialize OpenGL
    glMatrixMode(GL_PROJECTION)
    glLoadIdentity()
    gluPerspective(30, float(window.get_width())/window.get_height(), 101010101./2010101., 101010101./10101.)

    glEnable(GL_BLEND)
    glEnable(GL_TEXTURE_2D)
    glEnable(GL_FOG)
    glHint(GL_FOG_HINT, GL_NICEST)
    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST)
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
    glEnableClientState(GL_COLOR_ARRAY)
    glEnableClientState(GL_VERTEX_ARRAY)
    glEnableClientState(GL_TEXTURE_COORD_ARRAY)

    resource_loader = Loader()
    texture_manager = TextureManager(resource_loader)
    resource_loader.scan_archives(os.path.join(path, name)
                                    for name in ('CM.DAT', 'ST.DAT'))
    game = Game(resource_loader, [Player()], stage_num, 3, 16)

    # Load common data
    etama_anm_wrappers = (resource_loader.get_anm_wrapper(('etama3.anm',)),
                          resource_loader.get_anm_wrapper(('etama4.anm',)))
    effects_anm_wrapper = resource_loader.get_anm_wrapper(('eff00.anm',))

    # Load stage data
    stage = resource_loader.get_stage('stage%d.std' % stage_num)
    enemies_anm_wrapper = resource_loader.get_anm_wrapper2(('stg%denm.anm' % stage_num,
                                                            'stg%denm2.anm' % stage_num))

    background_anm_wrapper = resource_loader.get_anm_wrapper(('stg%dbg.anm' % stage_num,))
    background = Background(stage, background_anm_wrapper)

    # Preload textures
    for anm_wrapper in chain(etama_anm_wrappers,
                             (background_anm_wrapper, enemies_anm_wrapper,
                              effects_anm_wrapper)):
        texture_manager.preload(anm_wrapper)

    # Let's go!
    print(stage.name)

    # Main loop
    clock = pygame.time.Clock()
    while True:
        # Check events
        for event in pygame.event.get():
            if event.type == pygame.QUIT or (event.type == pygame.KEYDOWN and event.key in (pygame.K_ESCAPE, pygame.K_q)):
                sys.exit(0)
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_RETURN and event.mod & pygame.KMOD_ALT:
                    pygame.display.toggle_fullscreen()
        keystate = 0 #TODO

        # Update game
        background.update(game.game_state.frame) #TODO
        game.run_iter(keystate)

        # Draw everything
#            glClearColor(0.0, 0.0, 1.0, 0)
        glClear(GL_DEPTH_BUFFER_BIT)

        fog_b, fog_g, fog_r, _, fog_start, fog_end = background.fog_interpolator.values
        x, y, z = background.position_interpolator.values
        dx, dy, dz = background.position2_interpolator.values

        glFogi(GL_FOG_MODE, GL_LINEAR)
        glFogf(GL_FOG_START, fog_start)
        glFogf(GL_FOG_END,  fog_end)
        glFogfv(GL_FOG_COLOR, (fog_r / 255., fog_g / 255., fog_b / 255., 1.))

        #TODO
        glMatrixMode(GL_MODELVIEW)
        glLoadIdentity()
        # Some explanations on the magic constants:
        # 192. = 384. / 2. = width / 2.
        # 224. = 448. / 2. = height / 2.
        # 835.979370 = 224./math.tan(math.radians(15)) = (height/2.)/math.tan(math.radians(fov/2))
        # This is so that objects on the (O, x, y) plane use pixel coordinates
        gluLookAt(192., 224., - 835.979370 * dz,
                  192. + dx, 224. - dy, 0., 0., -1., 0.)
        glTranslatef(-x, -y, -z)

        glEnable(GL_DEPTH_TEST)
        for (texture_key, blendfunc), (nb_vertices, vertices, uvs, colors) in background.objects_by_texture.items():
            glBlendFunc(GL_SRC_ALPHA, (GL_ONE_MINUS_SRC_ALPHA, GL_ONE)[blendfunc])
            glBindTexture(GL_TEXTURE_2D, texture_manager[texture_key])
            glVertexPointer(3, GL_FLOAT, 0, vertices)
            glTexCoordPointer(2, GL_FLOAT, 0, uvs)
            glColorPointer(4, GL_UNSIGNED_BYTE, 0, colors)
            glDrawArrays(GL_QUADS, 0, nb_vertices)
        glDisable(GL_DEPTH_TEST)

        #TODO
        glMatrixMode(GL_MODELVIEW)
        glLoadIdentity()
        # Some explanations on the magic constants:
        # 192. = 384. / 2. = width / 2.
        # 224. = 448. / 2. = height / 2.
        # 835.979370 = 224./math.tan(math.radians(15)) = (height/2.)/math.tan(math.radians(fov/2))
        # This is so that objects on the (O, x, y) plane use pixel coordinates
        gluLookAt(192., 224., - 835.979370,
                  192., 224., 0., 0., -1., 0.)

        glDisable(GL_FOG)
        objects_by_texture = {}
        game.get_objects_by_texture(objects_by_texture)
        for (texture_key, blendfunc), (vertices, uvs, colors) in objects_by_texture.items():
            nb_vertices = len(vertices)
            glBlendFunc(GL_SRC_ALPHA, (GL_ONE_MINUS_SRC_ALPHA, GL_ONE)[blendfunc])
            glBindTexture(GL_TEXTURE_2D, texture_manager[texture_key])
            glVertexPointer(3, GL_FLOAT, 0, struct.pack(str(3 * nb_vertices) + 'f', *chain(*vertices)))
            glTexCoordPointer(2, GL_FLOAT, 0, struct.pack(str(2 * nb_vertices) + 'f', *chain(*uvs)))
            glColorPointer(4, GL_UNSIGNED_BYTE, 0, struct.pack(str(4 * nb_vertices) + 'B', *chain(*colors)))
            glDrawArrays(GL_QUADS, 0, nb_vertices)
        glEnable(GL_FOG)

        pygame.display.flip()
        clock.tick(120)



try:
    file_path, stage_num = sys.argv[1:]
    stage_num = int(stage_num)
except ValueError:
    print('Usage: %s game_dir_path stage_num' % sys.argv[0])
else:
    main(file_path, stage_num)