superstar_v2/DBObj/SongData.cs

using DualScreenDemo;
using System;
using System.IO;
using System.Net;
using System.Windows.Markup;
namespace DBObj
{
    public class SongData
    {
        private Song basic;
        private Artist A;
        private Artist B;
        public bool isPublicSong { get; set; }
        public PlayState state;

        public SongData()
        {
            basic = new("", "", "", "", 0, 1, "");
            A = new("", "");
            // B = new(null, null);
            isPublicSong = false;
        }
        public SongData(string songNumber, string song, string filename, int humanVoice, bool isPublic)
        {
            basic = new(songNumber, song, "", filename, humanVoice, 0, "");
            isPublicSong = isPublic;
        }
        public SongData(string songNumber, string song, string artistA, string artistB, string filename, string artistASimplified, string artistBSimplified, string songSimplified, int humanVoice, int dbChange, string situation)
        {
            basic = new(songNumber, song, songSimplified, filename, humanVoice, dbChange, situation);
            A = new Artist(artistA, artistASimplified);
            B = !artistB.Equals("") ? new Artist(artistB, artistBSimplified) : null;
            isPublicSong = false;
        }
        public SongData(SongData value, PlayState s)
        {
            basic = value.getBasic();
            A = value.getA();
            B = value.getB();
            state = s;
        }
        public Song getBasic() => basic;
        public Artist getA() => A;
        public Artist getB() => B;

        public string getNumber() => basic.getNumber();
        public string getName(bool IsSimplified = false) => basic.getName(IsSimplified);
        public string getName() => basic.getName();
        public string getArtist_A(bool IsSimplified) => A.getName(IsSimplified);
        public string getArtist_A() => A.getName();
        public string getArtist_B(bool IsSimplified) => B.getName(IsSimplified);
        public string getArtist_B() => B.getName();
        public int getNameLength() => basic.getName().Length;
        public string getFileName() => basic.getFileName();
        public string next_song_text()
        {
            var str = (state == PlayState.InsertPlayback) ? GetStateTxt(false) : "";
            return String.Format("下一首：{0}  {1}", basic.getName(false), str);
        }
        public string artist_text()
        {
            return B != null
                    ? $"{A.getName(false)} - {B.getName(false)}"
                    : A.getName(false);
        }
        public string name_text()
        {
            return B != null
                ? String.Format("{0} - {1} - {2}", A.getName(false), B.getName(false), basic.getName(false))
                : String.Format("{0} - {1}", A.getName(false), basic.getName(false));
        }
        public bool FileExistsInServers()
        {
            foreach (var server in Utils.Env.GetSongServers())
            {
                try
                {
                    // string fullPath = Path.Combine(server, basic.getFileName());
                    Uri fullUri = new Uri(new Uri(server), basic.getFileName());
                    // if (File.Exists(fullPath))
                    // {
                    //     Console.WriteLine($"找到檔案: {fullPath}");
                    return true;
                    // }
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"檢查檔案時發生錯誤: {ex.Message}");
                }
            }

            Console.WriteLine($"全部 server 都找不到檔案: {basic.getFileName()}");
            return false;
        }

        public string getFile()
        {
            return FindExistingPath(basic.getFileName());
        }
        private string FindExistingPath(string filename)
        {
            foreach (var server in Utils.Env.GetSongServers())
            {
                string fullPath = Path.Combine(server, filename);
                if (File.Exists(fullPath)) return fullPath;
            }
            return null; // 找不到就回原本的 filename，不加路徑
        }
        public Uri getFileUrl()
        {
            if (!isPublicSong)
            {
                return GetUri(basic.getFileName());
            }
            return null;
        }
        private Uri GetUri(string filename)
        {

            foreach (var server in Utils.Env.GetSongServers())
            {
                    var check = IsFtpUriReachable(new Uri(new Uri(server), filename).ToString());
                    if (!string.IsNullOrWhiteSpace(server) && check != false)
                    {
                        // Console.WriteLine(new Uri(new Uri(server), filename));
                        return new Uri(new Uri(server), filename);
                    }
            }

            // throw new InvalidOperationException("No valid server found.");
            if (!isPublicSong) Console.WriteLine("No valid server or file not found.");
            return null;
        }

        public Color GetStateColor() => state switch
        {
            PlayState.Played => Color.Gray,
            PlayState.Skipped => Color.Gray,
            PlayState.NoFile => Color.Gray,
            PlayState.Playing => Color.LimeGreen,
            PlayState.InsertPlayback => Color.Gold,
            _ => Color.White
        };
        public string GetStateTxt(bool IsSimplified) => (state == PlayState.NotPlayed) ? "" : $"({state.GetDescription(IsSimplified)})";
        public void SetState(PlayState s) => state = s;

        public PlayState GetState() => state;

        public int getHumanVoice() => basic.getHumanVoice();
        public override string ToString()
        {
            return String.Format("{0}  {1}", basic.getName(), state.GetDescription());
        }
        public bool IsFtpUriReachable(string ftpUri)
        {
            try
            {
#pragma warning disable SYSLIB0014 // 類型或成員已經過時
                var request = (FtpWebRequest)WebRequest.Create(ftpUri);
#pragma warning restore SYSLIB0014 // 類型或成員已經過時
                request.Method = WebRequestMethods.Ftp.ListDirectory; // Lightweight check
                // request.Credentials = new NetworkCredential("svr", "svr"); // Replace with actual username/password
                request.Timeout = 5000;

                using var response = (FtpWebResponse)request.GetResponse();
                return response.StatusCode == FtpStatusCode.OpeningData || response.StatusCode == FtpStatusCode.DataAlreadyOpen;
            }
            catch (WebException ex)
            {
                if (ex.Response is FtpWebResponse ftpResponse)
                {
                    Console.WriteLine($"FTP error: {ftpResponse.StatusDescription}");
                    return false;
                }

                Console.WriteLine($"Connection error: {ex.Message}");
                return false;
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Unexpected error: {ex.Message}");
                return false;
            }
        }

        public static bool IsFtpUri(Uri uri)
        {
            return uri != null && uri.Scheme == Uri.UriSchemeFtp;
        }

    }
}