import os

import libtcodpy as libtcod

#---Variables
screen_w = 80
screen_h = 50
limit_fps = 20
playerx = screen_w/2
playery = screen_h/2
ROOM_MAX_SIZE = 10
ROOM_MIN_SIZE = 6
MAX_ROOMS = 30

#Size of map
map_w = 80
map_h = 45
#colors of unlit tiles
color_dark_wall = libtcod.Color(0, 0, 100)
color_dark_ground = libtcod.Color(50, 50, 150)


#---Functions
def handle_keys():

    #Keys to quit and make fullscreen
    key = libtcod.console_wait_for_keypress(True)
    if key.vk == libtcod.KEY_ENTER and libtcod.KEY_ALT:
        #Alt + Enter to toggle fullscreen
        libtcod.console_set_fullscreen(not libtcod.console_is_fullscreen())
    #ESC to exit game
    elif key.vk == libtcod.KEY_ESCAPE:
        return True

    #Movement keys
    if libtcod.console_is_key_pressed(libtcod.KEY_UP):
        player.move(0, -1)
    elif libtcod.console_is_key_pressed(libtcod.KEY_DOWN):
        player.move(0, 1)
    elif libtcod.console_is_key_pressed(libtcod.KEY_LEFT):
        player.move(-1, 0)
    elif libtcod.console_is_key_pressed(libtcod.KEY_RIGHT):
        player.move(1, 0)

def create_room(room):
    global map
    #go through the tiles in the rectangle and make them passable
    for x in range(room.x1 + 1, room.x2):
        for y in range(room.y1 + 1, room.y2):
            map[x][y].blocked = False
            map[x][y].block_sight = False

def make_map():
    global map, player

    #fill map with "blocked" tiles
    map = [[ Tile(True)
        for y in range(map_h) ]
            for x in range(map_w) ]

    rooms = []
    num_rooms = 0

    for r in range(MAX_ROOMS):
        #random width and height
        w = libtcod.random_get_int(0, ROOM_MIN_SIZE, ROOM_MAX_SIZE)
        h = libtcod.random_get_int(0, ROOM_MIN_SIZE, ROOM_MAX_SIZE)
        #random position without going out of the boundaries of the map
        x = libtcod.random_get_int(0, 0, map_w - w - 1)
        y = libtcod.random_get_int(0, 0, map_h - h - 1)

        #"Rect" class makes rectangles easier to work with
        new_room = Rect(x, y, w, h)

        #run through the other rooms and see if they intersect with this one
        failed = False
        for other_room in rooms:
            if new_room.intersect(other_room):
                failed = True
                break

        if not failed:
            #this means there are no intersections, so this room is valid

            #"paint" it to the map's tiles
            create_room(new_room)

            #center coordinates of new room, will be useful later
            (new_x, new_y) = new_room.center()

            if num_rooms == 0:
                #this is the first room, where the player starts at
                player.x = new_x
                player.y = new_y
            else:
                #all rooms after the first:
                #connect it to the previous room with a tunnel

                #center coordinates of previous room
                (prev_x, prev_y) = rooms[num_rooms-1].center()

                #draw a coin (random number that is either 0 or 1)
                if libtcod.random_get_int(0, 0, 1) == 1:
                    #first move horizontally, then vertically
                    create_h_tunnel(prev_x, new_x, prev_y)
                    create_v_tunnel(prev_y, new_y, new_x)
                else:
                    #first move vertically, then horizontally
                    create_v_tunnel(prev_y, new_y, prev_x)
                    create_h_tunnel(prev_x, new_x, new_y)

            #finally, append the new room to the list
            rooms.append(new_room)
            num_rooms += 1

def render_all():
    global color_light_wall
    global color_light_ground
    #Draw all objects in the list
    for y in range(map_h):
        for x in range(map_w):
            wall = map[x][y].block_sight
            if wall:
                libtcod.console_set_back(con, x, y, color_dark_wall, libtcod.BKGND_SET )
            else:
                libtcod.console_set_back(con, x, y, color_dark_ground, libtcod.BKGND_SET )
    for object in objects:
        object.draw()
    libtcod.console_blit(con, 0, 0, screen_w, screen_h, 0, 0, 0)

def create_h_tunnel(x1, x2, y):
    global map
    for x in range(min(x1, x2), max(x1, x2) + 1):
        map[x][y].blocked = False
        map[x][y].block_sight = False
def create_v_tunnel(y1, y2, x):
    global map
    #vertical tunnel
    for y in range(min(y1, y2), max(y1, y2) + 1):
        map[x][y].blocked = False
        map[x][y].block_sight = False
#---Main Class
class Object:
    #This is a generic object: the player, a monster, an item, the stairs...
    #it's always represented by a character on screen.
    def __init__(self, x, y, char, color):
        self.x = x
        self.y = y
        self.char = char
        self.color = color

    def move(self, dx, dy):
        #Move by the given amount, if the destination is not blocked
            if not map[self.x + dx][self.y + dy].blocked:
                self.x += dx
                self.y += dy

    def draw(self):
        #Set the color and then draw the character that represents this object at its position
        libtcod.console_set_foreground_color(con, self.color)
        libtcod.console_put_char(con, self.x, self.y, self.char, libtcod.BKGND_NONE)

    def clear(self):
        #Erase the character that represents this object
        libtcod.console_put_char(con, self.x, self.y, ' ', libtcod.BKGND_NONE)

#---Tile Class
class Tile:
    #A tile of the map and its properties
    def __init__(self, blocked, block_sight = None):
        self.blocked = blocked

        #By default, if a tile is blocked, it also blocks sight
        if block_sight is None: block_sight = blocked
        self.block_sight = block_sight

class Rect:
    #A rectangle on the map. Used to characterize a room.
    def __init__(self, x, y, w, h):
        self.x1 = x
        self.y1 = y
        self.x2 = x + w
        self.y2 = y + h
    def center(self):
        center_x = (self.x1 + self.x2) / 2
        center_y = (self.y1 + self.y2) / 2
        return (center_x, center_y)

    def intersect(self, other):
        #returns true if this rectangle intersects with another one
        return (self.x1 <= other.x2 and self.x2 >= other.x1 and self.y1 <= other.y2 and self.y2 >= other.y1)

#This sets up the fonts
libtcod.console_set_custom_font('arial10x10.png', libtcod.FONT_TYPE_GREYSCALE | libtcod.FONT_LAYOUT_TCOD)

#This sets up the window
libtcod.console_init_root(screen_w, screen_h, 'Sida the Adventurer', False)

#This is a second console used for buffering certain things
con = libtcod.console_new(screen_w, screen_h)

player = Object(screen_w/2, screen_h/2, '@', libtcod.white)

npc = Object(screen_w/2, screen_h/2, '@', libtcod.yellow)

objects = [npc, player]

make_map()

#---Main Loop
while not libtcod.console_is_window_closed():

    #Render the screen
    render_all()

    #This prints the @ symbol
    libtcod.console_flush()

    #Erase all objects at their old locations before they move
    for object in objects:
        object.clear()

    #Handle keys and exit game if needed
    exit = handle_keys()
    if exit:
        break