using System;
using System.Collections.Generic;
using System.Linq;
using GameFinder.StoreHandlers.EGS;
using GameFinder.StoreHandlers.GOG;
using GameFinder.StoreHandlers.Origin;
using GameFinder.StoreHandlers.Steam;
using Microsoft.Extensions.Logging;
using Wabbajack.DTOs;
using Wabbajack.Paths;

namespace Wabbajack.Installer
{
    public class GameLocator : IGameLocator
    {
        private readonly Dictionary<Game, AbsolutePath> _locationCache;
        private readonly ILogger<GameLocator> _logger;
        private readonly SteamHandler _steam;
        private readonly OriginHandler? _origin;
        private readonly GOGHandler _gog;
        private readonly EGSHandler _egs;

        public GameLocator(ILogger<GameLocator> logger)
        {
            _logger = logger;
            _steam = new SteamHandler(logger);
            
            if (OperatingSystem.IsWindows())
            {
                _origin = new OriginHandler(true, false, logger);
            }

            _gog = new GOGHandler(logger);
            _egs = new EGSHandler(logger);
            
            _locationCache = new Dictionary<Game, AbsolutePath>();

            _steam.FindAllGames();
            _origin?.FindAllGames();
            _gog.FindAllGames();
            _egs.FindAllGames();
        }

        public AbsolutePath GameLocation(Game game)
        {
            if (TryFindLocation(game, out var path))
                return path;
            throw new Exception($"Can't find game {game}");
        }

        public bool IsInstalled(Game game)
        {
            return TryFindLocation(game, out _);
        }

        public bool TryFindLocation(Game game, out AbsolutePath path)
        {
            lock (_locationCache)
            {
                if (_locationCache.TryGetValue(game, out path))
                    return true;

                if (TryFindLocationInner(game, out path))
                {
                    _locationCache.Add(game, path);
                    return true;
                }
            }

            return false;
        }

        private bool TryFindLocationInner(Game game, out AbsolutePath path)
        {
            var metaData = game.MetaData();
            foreach (var steamGame in _steam.Games.Where(steamGame => metaData.SteamIDs.Contains(steamGame.ID)))
            {
                path = steamGame!.Path.ToAbsolutePath();
                return true;
            }

            foreach (var gogGame in _gog.Games.Where(gogGame => metaData.GOGIDs.Contains(gogGame.GameID)))
            {
                path = gogGame!.Path.ToAbsolutePath();
                return true;
            }
            
            foreach (var egsGame in _egs.Games.Where(egsGame => metaData.EpicGameStoreIDs.Contains(egsGame.CatalogItemId)))
            {
                path = egsGame!.Path.ToAbsolutePath();
                return true;
            }

            if (_origin != null)
            {
                foreach (var originGame in _origin.Games.Where(originGame => metaData.EpicGameStoreIDs.Contains(originGame.Id)))
                {
                    path = originGame.Path.ToAbsolutePath();
                    return true;
                }
            }

            path = default;
            return false;
        }
    }
}