import pygame as pg
import json

NEIGHBOR_OFFSETS = [
    (0, 0),
    (-1, 0),
    (-1, -1),
    (-1, 1),
    (0, 1),
    (0, -1),
    (1, 1),
    (1, 0),
    (1, -1),
]
PHYSICS_TILES = {"grass", "stone"}
AUTOTILE_TYPES = {"grass", "stone"}
AUTOTILE_MAP = {
    tuple(sorted([(1, 0), (0, 1)])): 0,
    tuple(sorted([(1, 0), (0, 1), (-1, 0)])): 1,
    tuple(sorted([(-1, 0), (0, 1)])): 2,
    tuple(sorted([(-1, 0), (0, -1), (0, 1)])): 3,
    tuple(sorted([(-1, 0), (0, -1)])): 4,
    tuple(sorted([(-1, 0), (0, -1), (1, 0)])): 5,
    tuple(sorted([(1, 0), (0, -1)])): 6,
    tuple(sorted([(1, 0), (0, -1), (0, 1)])): 7,
    tuple(sorted([(1, 0), (-1, 0), (0, 1), (0, -1)])): 8,
}


class Tilemap:
    """Eine Map aus Tiles."""

    def __init__(self, game, tile_size: int = 16):
        self.game = game
        self.tile_size = tile_size
        self.tilemap = {}
        self.offgrid_tiles = []
        for i in range(10):
            self.tilemap[str(3 + i) + ";10"] = {
                "type": "grass",
                "variant": 1,
                "pos": (3 + i, 10),
            }
            self.tilemap["10;" + str(5 + i)] = {
                "type": "stone",
                "variant": 1,
                "pos": (10, i + 5),
            }

    def render(self, surface: pg.Surface, offset: tuple = (0, 0)):
        for tile in self.offgrid_tiles:
            surface.blit(
                self.game.assets[tile["type"]][tile["variant"]],
                (tile["pos"][0] - offset[0], tile["pos"][1] - offset[1]),
            )
        for x in range(
            offset[0] // self.tile_size,
            (offset[0] + surface.get_width()) // self.tile_size + 1,
        ):
            for y in range(
                offset[1] // self.tile_size,
                (offset[1] + surface.get_height()) // self.tile_size + 1,
            ):
                location_key = f"{x};{y}"
                if location_key in self.tilemap:
                    tile = self.tilemap[location_key]
                    surface.blit(
                        self.game.assets[tile["type"]][tile["variant"]],
                        (
                            tile["pos"][0] * self.tile_size - offset[0],
                            tile["pos"][1] * self.tile_size - offset[1],
                        ),
                    )

    def tiles_around(self, pos: list):
        tiles = []
        tile_location = (int(pos[0] // self.tile_size), int(pos[1] // self.tile_size))
        for offset in NEIGHBOR_OFFSETS:
            check_location = (
                str(tile_location[0] + offset[0])
                + ";"
                + str(tile_location[1] + offset[1])
            )
            if check_location in self.tilemap:
                tiles.append(self.tilemap[check_location])

        return tiles

    def physics_rects_around(self, pos: list) -> list:
        # Erzeuge eine leere Liste für die Rechtecke
        rects = []
        # Durchlaufe alle Tiles aus der Umgebung (tiles_around)
        for tile in self.tiles_around(pos):
            # Prüfe, ob der Tile-Typ in PHYSICS_TILES enthalten ist
            # (nur diese Tiles sollen kollidieren)
            if tile["type"] in PHYSICS_TILES:
                # Rechne die Tile-Position in Pixel-Koordinaten um
                x_pixel = tile["pos"][0] * self.tile_size
                y_pixel = tile["pos"][1] * self.tile_size

                # Erzeuge ein pygame.Rect mit:
                # - x_pixel
                # - y_pixel
                # - Breite = self.tile_size
                # - Höhe   = self.tile_size
                rect = pg.Rect(x_pixel, y_pixel, self.tile_size, self.tile_size)
                # Füge das Rechteck der Liste rects hinzu
                rects.append(rect)

        # Gib die Liste der Rechtecke zurück
        return rects

    def autotile(self):

        for loc in self.tilemap:
            tile = self.tilemap[loc]

            neighbors = set()

            for shift in [(1, 0), (-1, 0), (0, -1), (0, 1)]:
                check_loc = (
                    str(tile["pos"][0] + shift[0])
                    + ";"
                    + str(tile["pos"][1] + shift[1])
                )

                if check_loc in self.tilemap:
                    if self.tilemap[check_loc]["type"] == tile["type"]:
                        neighbors.add(shift)

            neighbors = tuple(sorted(neighbors))

            if (tile["type"] in AUTOTILE_TYPES) and (neighbors in AUTOTILE_MAP):
                tile["variant"] = AUTOTILE_MAP[neighbors]

    def save(self, path: str) -> None:
        data = {
            "tilemap": self.tilemap,
            "tile_size": self.tile_size,
            "offgrid": self.offgrid_tiles,
        }

        with open(path, "w") as f:
            json.dump(data, f)

    def load(self, path: str) -> None:
        """Lädt die gespeicherte Tilemap."""

        with open(path, "r") as f:
            map_data: dict = json.load(f)

        self.tilemap: dict[str, dict] = map_data["tilemap"]
        self.tile_size: int = map_data["tile_size"]
        self.offgrid_tiles: list[dict] = map_data["offgrid"]