using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using System.IO;
using System.Linq;
using DBObj;

namespace DataCheck
{
    public class SongChecker
    {
        private static List<SongData> playingSongList= new();
        //public static List<PlayState> playStates;
        private static List<SongData> publicSongList = new();
        private SongData welcome = new SongData("0", "歡迎光臨", @"D:\video\welcome.mpg", 1 ,true);
        private SongData close = new SongData("0", "結束播放", @"D:\video\CLOSE.MPG", 1 ,true);

        public SongChecker()
        {
            string serverPath = Utils.Env.GetPath("video", "");
            string localPath = @"D:\video";
            // 加入你要同步的資料夾
            SyncFolder(serverPath, localPath, "video", new[] { ".mpg" });
        }
        public static bool AddSongToPlayList(SongData song)
        {
            playingSongList.Add(song);
            return true;
        }
        public static bool isPlayingUserSong()
        {
            return playingSongList.Count == 0;
        }
        public static SongData GetCurrentSong()
        {
            SongData song = null;
            int count = playingSongList.Count;
            if (count == 0)
            {
                song = publicSongList[0];
                publicSongList.RemoveAt(0);
                publicSongList.Add(song);
            }
            else
            {
                song = playingSongList[0];
                playingSongList.RemoveAt(0);
            }
            return song;
        }
        public static SongData GetNextSong()
        {
             return playingSongList.Count > 1 ? playingSongList[1] : null;
        }

        private void SyncFolder(string serverPath, string localPath, string label, string[] extensions)
        {

            if (!Directory.Exists(localPath)) Directory.CreateDirectory(localPath);
            if (!Directory.Exists(serverPath))
            {
                Console.WriteLine($"找不到伺服器資料夾：{serverPath}");
                return;
            }

            var serverFiles = Directory.GetFiles(serverPath)
                .Where(f => extensions.Contains(Path.GetExtension(f), StringComparer.OrdinalIgnoreCase))
                .Select(f => new FileInfo(f))
                .ToDictionary(f => f.Name, f => f);

            var localFiles = Directory.GetFiles(localPath)
                .Where(f => extensions.Contains(Path.GetExtension(f), StringComparer.OrdinalIgnoreCase))
                .Select(f => new FileInfo(f))
                .ToDictionary(f => f.Name, f => f);

            // 1. 複製或更新檔案
            foreach (var serverFile in serverFiles)
            {
                string dest = Path.Combine(localPath, serverFile.Key);
                bool needsCopy = !localFiles.ContainsKey(serverFile.Key) ||
                                 serverFile.Value.LastWriteTime > localFiles[serverFile.Key].LastWriteTime;
                if (needsCopy)
                {
                    try
                    {
                        File.Copy(serverFile.Value.FullName, dest, true);
                        Console.WriteLine($"✅ 更新 {label}: {serverFile.Key}");
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine($"❌ 複製 {label} 失敗 {serverFile.Key}: {ex.Message}");
                        continue; // 如果複製失敗就不加入 SongData
                    }
                }
                string fileName = Path.GetFileNameWithoutExtension(serverFile.Key);
                Match match = Regex.Match(fileName, @"^(?<songNumber>\d+)-.*?-(?<songName>[^-]+)-");
                if (match.Success)
                {
                    publicSongList.Add(new SongData(
                        match.Groups["songNumber"].Value,           // songNumber
                        match.Groups["songName"].Value,            // song
                        Path.Combine(localPath, serverFile.Key),            // songFilePathHost1
                        1,                    // priority
                        true
                    ));
                }
            }

            // 2. 刪除多餘的本地檔案
            foreach (var localFile in localFiles)
            {
                if (!serverFiles.ContainsKey(localFile.Key))
                {
                    try
                    {
                        File.Delete(localFile.Value.FullName);
                        Console.WriteLine($"刪除多餘{label}: {localFile.Key}");
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine($"刪除{label}失敗 {localFile.Key}: {ex.Message}");
                    }
                }
            }
        }
    }
}