import json
from pathlib import Path

from led_platform.domain import PhysicalOutput, Tile


class TileStore:
    def __init__(self, config_path: Path, wall_width: int, wall_height: int) -> None:
        self.config_path = config_path
        self.wall_width = wall_width
        self.wall_height = wall_height
        self._tiles: dict[str, Tile] = {}
        self.reload()

    def reload(self) -> None:
        if self.config_path.exists():
            data = json.loads(self.config_path.read_text(encoding="utf-8"))
            tiles = [Tile(**item) for item in data["tiles"]]
        else:
            tiles = self._default_tiles()
        self._tiles = {tile.id: tile for tile in tiles}

    def all(self) -> list[Tile]:
        return list(self._tiles.values())

    def get(self, tile_id: str) -> Tile:
        if tile_id not in self._tiles:
            raise KeyError(tile_id)
        return self._tiles[tile_id]

    def ids(self) -> list[str]:
        return list(self._tiles.keys())

    def _default_tiles(self) -> list[Tile]:
        half_width = self.wall_width // 2
        return [
            Tile(
                id="left",
                name="Left output server",
                x=0,
                y=0,
                width=half_width,
                height=self.wall_height,
                wall_width=self.wall_width,
                wall_height=self.wall_height,
                desktop_width=7680,
                desktop_height=4320,
                physical_outputs=self._default_outputs("left"),
            ),
            Tile(
                id="right",
                name="Right output server",
                x=half_width,
                y=0,
                width=self.wall_width - half_width,
                height=self.wall_height,
                wall_width=self.wall_width,
                wall_height=self.wall_height,
                desktop_width=7680,
                desktop_height=4320,
                physical_outputs=self._default_outputs("right"),
            ),
        ]

    @staticmethod
    def _default_outputs(prefix: str) -> list[PhysicalOutput]:
        return [
            PhysicalOutput(id=f"{prefix}-1", index=1, x=0, y=0),
            PhysicalOutput(id=f"{prefix}-2", index=2, x=3840, y=0),
            PhysicalOutput(id=f"{prefix}-3", index=3, x=0, y=2160),
            PhysicalOutput(id=f"{prefix}-4", index=4, x=3840, y=2160),
        ]