using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace DataCheck
{
    public class DataChecker
    {
        public DataChecker()
        {
            // 加入你要同步的資料夾
            SyncFolder(Utils.Env.GetPath("video", ""), @"D:\video", "video", new[] { ".mpg" });
            
        }

        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)
            {
                bool needsCopy = !localFiles.ContainsKey(serverFile.Key) ||
                                 serverFile.Value.LastWriteTime > localFiles[serverFile.Key].LastWriteTime;

                if (needsCopy)
                {
                    try
                    {
                        string dest = Path.Combine(localPath, serverFile.Key);
                        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}");
                    }
                }
            }

            // 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}");
                    }
                }
            }
        }
    }
}