import pygame, json

class Tilemap:
    def __init__(self, game, tile=16):
        self.game = game
        self.tile_size = tile
        self.tilemap = {}

    def save(self, path):
        f = open(path, 'w')
        json.dump({'tilemap': self.tilemap, 'tile_size': self.tile_size}, f)
        f.close()

    def load(self, path):
        f = open(path, 'r')
        map_data = json.load(f)
        f.close()

        self.tilemap = map_data['tilemap']
        self.tile_size = map_data['tile_size']            
    

    def render(self, surf, offset=(0, 0)):
        for x in range(offset[0] // self.tile_size, (offset[0] + surf.get_width()) // self.tile_size + 1):
            for y in range(offset[1] // self.tile_size, (offset[1] + surf.get_height()) // self.tile_size + 1):
                loc = str(x) + ';' + str(y)
                if loc in self.tilemap:
                    tile = self.tilemap[loc]
                    surf.blit(self.game.assets[tile['type']][tile['variant']], (tile['pos'][0] * self.tile_size - offset[0], tile['pos'][1] * self.tile_size - offset[1]))