/*
 * Copyright (C) 2009-2011 Ferreri Alessio
 * Copyright (C) 2009-2019 PCSX2 Dev Team
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

using System.Collections.Generic;
using System.IO;
using GSDumpGUI.Forms.Entities;

namespace GSDumpGUI.Forms.Helper
{
    public class GsDumpFinder : IGsDumpFinder
    {
        private readonly ILogger _logger;

        public GsDumpFinder(ILogger logger)
        {
            _logger = logger;
        }

        public IEnumerable<GsDumpFile> GetValidGsdxDumps(DirectoryInfo directory)
        {
            var dumps = new FileInfo[0];

            try
            {
                dumps = directory.GetFiles("*.gs", SearchOption.TopDirectoryOnly);
            }
            catch (DirectoryNotFoundException)
            {
                _logger.Warning($"Failed to open folder '{directory}'.");
                yield break;
            }

            foreach (var dump in dumps)
            {
                int crc;
                using (var fileStream = File.OpenRead(dump.FullName))
                {
                    using (var br = new BinaryReader(fileStream))
                    {
                        crc = br.ReadInt32();
                        br.Close();
                    }
                }

                var extensions = new[] {".png", ".bmp"};
                var dumpPreview = default(FileInfo);
                foreach (var extension in extensions)
                {
                    var imageFile = new FileInfo(Path.ChangeExtension(dump.FullName, extension));
                    if (!imageFile.Exists)
                        continue;
                    dumpPreview = imageFile;
                    break;
                }

                _logger.Information($"Identified Dump for game ({crc:X}) with filename '{dump}'");
                yield return new GsDumpFile
                {
                        DisplayText = dump.Name + " | CRC : " + crc.ToString("X"),
                        File = dump,
                        PreviewFile = dumpPreview
                };
            }
        }
    }
}