import pygame
import os
import numpy as np
TILE_DICT = {
    1 : ('iso',0,True),
    2 : ('iso',1,False),
    3 : ('iso',2,False),
    4 : ('iso',3,False),
    5 : ('iso',4,False),
    6 : ('iso',5,False)
}
BASE_IMG_PATH = 'data/images/'
def load_image(path):
    img = pygame.image.load(BASE_IMG_PATH + path).convert()
    img.set_colorkey((0,0,0))
    return img

def load_images(path):
    images = []
    for img_name in sorted(os.listdir(BASE_IMG_PATH + path)):
        images.append(load_image(path + '/' + img_name))
    return images
def to_isometric(coord, tilesize):
    #(1,0) -> (+tilesize[0]/2,+tilesize[1]/2)
    #(0,1) -> (-tilesize[0]/2,+tilesize[1]/2)
    #a must be (+tilesize[0]/2,-tilesize[0]/2)
    #          (+tilesize[1]/2,+tilesize[1]/2)
    a = np.array([[1,-1],[1,1]])
    a = 0.5 * a * tilesize[:,np.newaxis]
    return np.squeeze(np.matmul(a,coord[:,np.newaxis]))
def to_cartesian(coord, tilesize):
    #manually calculated the inverse of a in to_isometric
    a = np.array([[1,1],[-1,1]])
    a = a * (1/tilesize)
    return np.squeeze(np.matmul(a,coord[:,np.newaxis]))
def to_isometric_pixel(coord):
    a = np.array([[1,-1],[1,1]])
    a = 0.5 * a
    return np.squeeze(np.matmul(a,coord[:,np.newaxis]))

class Animation:
    def __init__(self, images, img_dur=5, loop=True):
        self.images = images
        self.img_duration = img_dur
        self.loop = loop
        self.done = False
        self.frame = 0 #in the sense of gameframe, not current frame of the animation

    def copy(self):
        return Animation(self.images, self.img_duration, self.loop)

    def update(self):
        if self.loop:
            self.frame = (self.frame + 1) % (self.img_duration * len(self.images))
        else:
            self.frame = min(self.frame + 1, self.img_duration * len(self.images) - 1)
            if self.frame >= self.img_duration * len(self.images) - 1:
                self.done = True
    def img(self):
        return self.images[int(self.frame / self.img_duration)]