import os
from typing import Optional

from lmm.config import LMMConfig
from lmm.const import LMM_GAMES_PATH
from lmm.games.config import load_game_configs
from lmm.games.game import Game
from lmm.games.bg3 import GAME_NAME as BG3
from lmm.mods.bg3 import install_mod as bg3_install_mod

import click


def get_game_by_name(name: str) -> Optional[Game]:
    games = load_game_configs()
    for game in games:
        if game.name == name:
            return game
    return None


@click.group()
@click.pass_context
def cli(ctx):
    if ctx.invoked_subcommand is None:
        click.echo("Invoked without a subcommand")


@cli.command()
@click.option("-g", "--game", required=True)
@click.option("-p", "--profile", required=True)
def launch(game: str, profile: str):
    game = get_game_by_name(game)
    if game is None:
        click.echo("Game not found")
        return

    profile = game.get_profile_by_name(profile)
    if profile is None:
        click.echo("Profile not found")
        return

    # Check if the game can start.
    if not game.can_start():
        click.echo("Cannot start game:")

        for issue in game.cannot_start_reasons():
            click.echo(issue)
        return

    # Check if we have a runner available.
    runner = None
    if profile.runner is not None:
        runner = profile.runner
    elif game.default_runner is not None:
        runner = game.default_runner
    if runner is None:
        click.echo("Cannot launch profile as no runner or default runner is configured")
        return

    # Prepare mounts
    mounts_ok = True
    mounts = game.prepare_overlays(profile)
    for mount in mounts:
        result = mount.mount()
        if result is None:
            click.echo("Mount failed")
            mounts_ok = False
            break

        print(f"Mounted overlayfs at {result}")

    # Launch the game
    if mounts_ok:
        runner.run(game)
        game.wait()

    # Unmount (with retries)
    failed = False
    for retry in range(5):
        failed = any(not mount.unmount() for mount in mounts)
        if not failed:
            break

        print(f"Unmounting failed ({retry +1 }/5). Waiting 3s...")
        time.sleep(3)
    if failed:
        print("Unmounting failed!")


@cli.command()
@click.option("-g", "--game", required=True)
@click.option("-P", "--path", required=True)
def install(game: str, path: str):
    install = {
        BG3: bg3_install_mod,
    }.get(game, None)
    if install is None:
        click.echo(f'Unknown game "{game}"')
        return

    install(Path(path))


@cli.command()
@click.option("-g", "--game")
def mods(game: Optional[str]):
    if game is not None:
        games = [game]
    else:
        games = [
            item
            for item in os.listdir(LMM_GAMES_PATH)
            if (LMM_GAMES_PATH / item).is_dir()
        ]

    for idx, game_name in enumerate(games):
        click.echo(f"Installed mods for {game_name}:")
        for item in os.listdir(LMM_GAMES_PATH / game_name):
            path = LMM_GAMES_PATH / game_name / item
            if not path.is_dir():
                continue

            click.echo(f"- {item}")

        if idx < len(games) - 1:
            click.echo()


@cli.command
def list():
    games = load_game_configs()
    for idx, game in enumerate(games):
        if game.default_runner is not None:
            default_runner_name = game.default_runner.__class__.__name__
        else:
            default_runner_name = "None"

        click.echo(f"- {game.name}")
        click.echo(f"  {game.installation_path}")
        click.echo(f"  Can start: {game.can_start()}")
        click.echo(f"  Default runner: {default_runner_name}")
        click.echo("  Profiles:")
        for profile in game.profiles:
            mods = ", ".join(profile.get_mod_names())
            if profile.runner is not None:
                runner_name = profile.runner.__class__.__name__
            else:
                runner_name = "None"

            click.echo(f"  - {profile.name}")
            click.echo(f"    Runner: {runner_name}")
            click.echo(f"    Mods: {mods}")

        if idx < len(games) - 1:
            click.echo()


def main():
    LMMConfig.init()
    cli()


if __name__ == "__main__":
    cli()