import os
from pathlib import Path
from enum import Enum, auto
from dataclasses import dataclass
from typing import Generator, Any

from lmm.const import LMM_GAMES_PATH
from lmm.profile import Profile
from lmm.overlayfs import OverlayFSMount
from lmm.games.game import ProtonGame, CannotStartReason, PathNotExistingReason
from lmm.runners.base import runner_from_config

GAME_NAME = "BaldursGate3"


class BaldursGate3ModType(Enum):
    # Override the game files
    ROOT = 1

    # Override the Paks in the compatdata prefix
    PAK = 2


@dataclass
class BaldursGate3Mod:
    # The directory name
    name: str

    # The type of mod
    type: BaldursGate3ModType


@dataclass
class BaldursGate3Profile(Profile):
    mods: list[BaldursGate3Mod]

    def __init__(self, name: str, mods: list[BaldursGate3Mod], **kwargs):
        super().__init__(GAME_NAME, name, **kwargs)
        self.mods = mods

    def get_mods(
        self, type: BaldursGate3ModType
    ) -> Generator[BaldursGate3Mod, None, None]:
        """Yields all mods of type @type"""
        for mod in self.mods:
            if not mod.type == type:
                continue

            yield mod

    def has_mods_of_type(self, type: BaldursGate3ModType) -> bool:
        """Returns whether the profile has any mods of type @type"""
        return any(self.get_mods(type))

    def get_mod_names(self) -> list[str]:
        return [mod.name for mod in self.mods]


class BaldursGate3Game(ProtonGame):
    def __init__(self, profiles: list[BaldursGate3Profile], **kwargs):
        super().__init__(GAME_NAME, "1086940", profiles, **kwargs)

    @property
    def installation_path(self) -> Path:
        return self.steam_library / "steamapps" / "common" / "Baldurs Gate 3"

    @property
    def compat_path(self) -> Path:
        return self.steam_library / "steamapps" / "compatdata" / self.appid

    @property
    def user_mods_path(self) -> Path:
        return (
            self.compat_path
            / "pfx"
            / "drive_c"
            / "users"
            / "steamuser"
            / "AppData"
            / "Local"
            / "Larian Studios"
            / "Baldur's Gate 3"
            / "Mods"
        )

    def can_start(self) -> bool:
        return self.user_mods_path.exists() and self.installation_path.exists()

    def cannot_start_reasons(self) -> list[CannotStartReason]:
        issues = []
        if not self.user_mods_path.exists():
            issues.append(
                PathNotExistingReason(self.user_mods_path),
            )
        if not self.installation_path.exists():
            issues.append(
                PathNotExistingReason(self.installation_path),
            )
        return issues

    def prepare_overlays(self, profile: BaldursGate3Profile) -> list[OverlayFSMount]:
        overlays = []

        if profile.has_mods_of_type(BaldursGate3ModType.ROOT):
            mods = list(profile.get_mods(BaldursGate3ModType.ROOT))
            mod_paths = [LMM_GAMES_PATH / GAME_NAME / mod.name for mod in mods]
            overlays.append(
                OverlayFSMount(
                    self.installation_path,
                    mod_paths,
                    mount=self.installation_path,
                ),
            )

            mod_names = ", ".join([mod.name for mod in mods])
            print(f"Loaded root mods: {mod_names}")
        if profile.has_mods_of_type(BaldursGate3ModType.PAK):
            mods = list(profile.get_mods(BaldursGate3ModType.PAK))
            mod_paths = [os.path.join("./", mod.name) for mod in mods]

            # Merge all mods
            overlays.append(
                OverlayFSMount(
                    self.user_mods_path,
                    mod_paths,
                    self.user_mods_path,
                    cd=LMM_GAMES_PATH / self.name,
                ),
            )

            mod_names = ", ".join([mod.name for mod in mods])
            print(f"Loaded PAK mods: {mod_names}")

        return overlays

    @property
    def game_executable(self) -> Path:
        return self.installation_path / "bin" / "bg3.exe"

    def to_dict(self) -> dict[str, Any]:
        return {
            "profiles": [
                {
                    "name": profile.name,
                    "mods": [
                        {
                            "name": mod.name,
                            "type": mod.type.value,
                        }
                        for mod in profile.mods
                    ],
                }
                for profile in self.profiles
            ]
        }

    @classmethod
    def from_dict(cls, data: dict[str, Any]) -> "BaldursGate3Game":
        profiles = []
        for profile in data["profiles"]:
            mods = []
            for mod in profile["mods"]:
                mods.append(
                    BaldursGate3Mod(
                        mod["name"],
                        BaldursGate3ModType.ROOT
                        if mod["type"] == 1
                        else BaldursGate3ModType.PAK,
                    ),
                )

            if "runner" in profile:
                runner = runner_from_config(profile["runner"])
            else:
                runner = None

            profiles.append(
                BaldursGate3Profile(
                    profile["name"],
                    mods,
                    runner=runner,
                ),
            )

        if "default_runner" in data:
            default_runner = runner_from_config(data["default_runner"])
        else:
            default_runner = None

        return BaldursGate3Game(profiles, default_runner=default_runner)