using System.IO;
using System.Windows.Controls;
using NAudio;
using NAudio.Wave;
using PCL.Core.App;
using PCL.Core.App.Localization;
using PCL.Core.Utils;

namespace PCL;

public static class ModMusic
{
    /// <summary>
    ///     当前正在播放的 NAudio.Wave.WaveOutEvent。
    /// </summary>
    public static WaveOutEvent musicNAudio;

    /// <summary>
    ///     当前播放的音乐地址。
    /// </summary>
    private static string musicCurrent = "";

    private static void MusicLoop(bool isFirstLoad = false)
    {
        WaveOutEvent currentWave = null;
        AudioFileReader reader = null;

        try
        {
            currentWave = new WaveOutEvent();
            musicNAudio = currentWave;
            currentWave.DeviceNumber = -1; // 使用默认设备

            reader = new AudioFileReader(musicCurrent);
            currentWave.Init(reader);
            currentWave.Play();

            // 首次加载且用户未启用自动播放，则暂停
            if (isFirstLoad && !Config.Preference.Music.StartOnStartup) currentWave.Pause();

            MusicRefreshUI();

            var lastVolume = Config.Preference.Music.Volume;
            currentWave.Volume = lastVolume / 1000.0f;

            // 播放主循环
            while (currentWave.Equals(musicNAudio) && currentWave.PlaybackState != PlaybackState.Stopped)
            {
                // 音量动态更新
                var currentVolume = Config.Preference.Music.Volume;
                if (currentVolume != lastVolume)
                {
                    lastVolume = currentVolume;
                    currentWave.Volume = currentVolume / 1000.0f;
                }

                // 更新进度条
                if (reader.TotalTime.TotalMilliseconds > 0d)
                {
                    var progress = reader.CurrentTime.TotalMilliseconds / reader.TotalTime.TotalMilliseconds;
                    ModBase.RunInUi(() => ModMain.frmMain.BtnExtraMusic.Progress = progress);
                }

                Thread.Sleep(100);
            }

            // 播放结束，继续下一首
            if (currentWave.PlaybackState == PlaybackState.Stopped &&
                (musicAllList?.Any() is { } arg5 ? arg5 : (bool?)null).GetValueOrDefault())
                MusicStartPlay(DequeueNextMusicAddress(), isFirstLoad);
        }

        catch (Exception ex)
        {
            ModBase.Log(ex, $"播放音乐出现内部错误（{musicCurrent}）", ModBase.LogLevel.Developer);

            // 错误处理：精准提示用户
            var fileName = ModBase.GetFileNameFromPath(musicCurrent);
            if (ex is MmException)
            {
                var msg = ex.Message;
                if (msg.Contains("AlreadyAllocated"))
                    HintService.Hint(Lang.Text("Music.Error.DeviceBusy"), HintType.Error);
                else if (msg.Contains("NoDriver") || msg.Contains("BadDeviceId"))
                    HintService.Hint(Lang.Text("Music.Error.DeviceChanged"), HintType.Error);
                else
                    ModBase.Log(
                        ex,
                        $"播放失败（{fileName}）",
                        ModBase.LogLevel.Hint,
                        userSummary: Lang.Text("Music.Error.PlaybackFailed", fileName));
            }
            else if (ex.Message.Contains("Got a frame at sample rate") ||
                     ex.Message.Contains("does not support changes to"))
            {
                HintService.Hint(
                    Lang.Text("Music.Error.PropertyChangeUnsupported", fileName),
                    HintType.Error);
            }
            else if ((!musicCurrent.EndsWithF(".wav", true) && !musicCurrent.EndsWithF(".mp3", true) &&
                      !musicCurrent.EndsWithF(".flac", true)) || ex.Message.Contains("0xC00D36C4"))
            {
                HintService.Hint(
                    Lang.Text("Music.Error.UnsupportedFormat", fileName),
                    HintType.Error);
            }
            else
            {
                ModBase.Log(
                    ex,
                    $"播放失败（{fileName}）",
                    ModBase.LogLevel.Hint,
                    userSummary: Lang.Text("Music.Error.PlaybackFailed", fileName));
            }

            // 移除无效文件
            musicAllList?.Remove(musicCurrent);
            musicWaitingList?.Remove(musicCurrent);
            MusicRefreshUI();

            Thread.Sleep(2000);

            // 尝试播放下一首
            if (ex is FileNotFoundException)
                MusicRefreshPlay(true, isFirstLoad);
            else
                MusicStartPlay(DequeueNextMusicAddress(), isFirstLoad);
        }
        finally
        {
            currentWave?.Dispose();
            reader?.Dispose();
            MusicRefreshUI();
        }
    }

    #region 播放列表

    /// <summary>
    ///     接下来要播放的音乐文件路径。未初始化时为 Nothing。
    /// </summary>
    public static List<string> musicWaitingList;

    /// <summary>
    ///     全部音乐文件路径。未初始化时为 Nothing。
    /// </summary>
    public static List<string> musicAllList;

    /// <summary>
    ///     初始化音乐播放列表。
    /// </summary>
    /// <param name="forceReload">强制全部重新载入列表。</param>
    /// <param name="preventFirst">在重载列表时避免让某项成为第一项。</param>
    private static void MusicListInit(bool forceReload, string preventFirst = null)
    {
        if (forceReload)
            musicAllList = null;

        try
        {
            if (musicAllList is null)
            {
                musicAllList = new List<string>();
                var musicDir = Path.Combine(ModBase.exePath, "PCL", "Musics");
                Directory.CreateDirectory(musicDir);
                foreach (var file in ModBase.EnumerateFiles(musicDir))
                {
                    var ext = file.Extension.ToLowerInvariant();
                    // 忽略非音频文件
                    if (new[] { ".ini", ".jpg", ".txt", ".cfg", ".lrc", ".db", ".png" }.Contains(ext))
                        continue;
                    musicAllList.Add(file.FullName);
                }
            }

            // 根据设置决定是否随机
            if (Config.Preference.Music.ShufflePlayback)
                musicWaitingList = RandomUtils.Shuffle(new List<string>(musicAllList));
            else
                musicWaitingList = new List<string>(musicAllList);

            // 避免 PreventFirst 成为第一项
            if (preventFirst is not null && musicWaitingList.Count > 0 && string.Equals(musicWaitingList[0],
                    preventFirst, StringComparison.OrdinalIgnoreCase))
            {
                musicWaitingList.RemoveAt(0);
                musicWaitingList.Add(preventFirst);
            }
        }

        catch (Exception ex)
        {
            ModBase.Log(
                ex,
                "初始化音乐列表失败",
                ModBase.LogLevel.Feedback,
                userSummary: Lang.Text("Music.Error.OperationFailed"));
        }
    }

    /// <summary>
    ///     获取下一首播放的音乐路径并将其从列表中移除。
    ///     如果没有，可能会返回 Nothing。
    /// </summary>
    private static string DequeueNextMusicAddress()
    {
        if (musicAllList is null || !musicAllList.Any() || !musicWaitingList.Any()) MusicListInit(false);

        if (musicWaitingList.Any())
        {
            var nextMusic = musicWaitingList[0];
            musicWaitingList.RemoveAt(0);
            if (!musicWaitingList.Any()) MusicListInit(false, nextMusic);
            return nextMusic;
        }

        return null;
    }

    #endregion

    #region UI 控制

    /// <summary>
    ///     刷新背景音乐按钮 UI 与设置页 UI。
    /// </summary>
    private static void MusicRefreshUI()
    {
        ModBase.RunInUi(() =>
        {
            try
            {
                if ((musicAllList?.Any() is { } arg1 ? arg1 : null) == false)
                {
                    ModMain.frmMain.BtnExtraMusic.Show = false;
                }
                else
                {
                    ModMain.frmMain.BtnExtraMusic.Show = true;
                    var fileName = ModBase.GetFileNameWithoutExtentionFromPath(musicCurrent);
                    var isSingle = musicAllList.Count == 1;
                    string tipText;
                    if (MusicState == MusicStates.Pause)
                    {
                        ModMain.frmMain.BtnExtraMusic.SvgIcon = "lucide/play";
                        ModMain.frmMain.BtnExtraMusic.LogoScale = 0.8d;
                        tipText = Lang.Text(
                            isSingle
                                ? "Music.ToolTip.Paused.Single"
                                : "Music.ToolTip.Paused.Multiple",
                            fileName);
                    }
                    else
                    {
                        ModMain.frmMain.BtnExtraMusic.SvgIcon = "lucide/music";
                        ModMain.frmMain.BtnExtraMusic.LogoScale = 1d;
                        tipText = Lang.Text(
                            isSingle
                                ? "Music.ToolTip.Playing.Single"
                                : "Music.ToolTip.Playing.Multiple",
                            fileName);
                    }

                    ModMain.frmMain.BtnExtraMusic.ToolTip = tipText;
                    ToolTipService.SetVerticalOffset(ModMain.frmMain.BtnExtraMusic,
                        tipText.Contains("\n") ? 10 : 16);
                }

                ModMain.frmSetupUI?.MusicRefreshUI();
            }
            catch (Exception ex)
            {
                ModBase.Log(
                    ex,
                    "刷新背景音乐 UI 失败",
                    ModBase.LogLevel.Feedback,
                    userSummary: Lang.Text("Music.Error.OperationFailed"));
            }
        });
    }

    public static void MusicControlPause()
    {
        if (musicNAudio is null)
        {
            HintService.Hint(Lang.Text("Music.Error.NotStarted"), HintType.Error);
            return;
        }

        switch (MusicState)
        {
            case MusicStates.Pause:
            {
                MusicResume();
                break;
            }
            case MusicStates.Play:
            {
                MusicPause(); // Stop
                break;
            }

            default:
            {
                ModBase.Log("[Music] 音乐目前为停止状态，已强制尝试开始播放", ModBase.LogLevel.Debug);
                MusicRefreshPlay(false);
                break;
            }
        }
    }

    public static void MusicControlNext()
    {
        if (musicAllList?.Count is { } arg2 && arg2 == 1)
        {
            MusicStartPlay(musicCurrent);
            HintService.Hint(Lang.Text("Music.Hint.Replaying", ModBase.GetFileNameFromPath(musicCurrent)),
                HintType.Success);
        }
        else
        {
            var addr = DequeueNextMusicAddress();
            if (addr is null)
            {
                HintService.Hint(Lang.Text("Music.Error.NoAvailable"), HintType.Error);
            }
            else
            {
                MusicStartPlay(addr);
                HintService.Hint(Lang.Text("Music.Hint.Playing", ModBase.GetFileNameFromPath(addr)),
                    HintType.Success);
            }
        }

        MusicRefreshUI();
    }

    #endregion

    #region 主状态控制

    public static MusicStates MusicState
    {
        get
        {
            if (musicNAudio is null)
                return MusicStates.Stop;
            return musicNAudio.PlaybackState == PlaybackState.Paused ? MusicStates.Pause :
                musicNAudio.PlaybackState == PlaybackState.Stopped ? MusicStates.Stop : MusicStates.Play;
        }
    }

    public enum MusicStates
    {
        Stop,
        Play,
        Pause
    }

    public static void MusicRefreshPlay(bool showHint, bool isFirstLoad = false)
    {
        try
        {
            MusicListInit(true);

            if ((musicAllList?.Any() is { } arg3 ? arg3 : null) == false)
            {
                if (musicNAudio is not null)
                {
                    musicNAudio = null;
                    if (showHint)
                        HintService.Hint(Lang.Text("Music.Hint.Cleared"), HintType.Success);
                }
                else if (showHint)
                {
                    HintService.Hint(Lang.Text("Music.Error.NotDetected"), HintType.Error);
                }
            }
            else
            {
                var addr = DequeueNextMusicAddress();
                if (addr is null)
                {
                    if (showHint)
                        HintService.Hint(Lang.Text("Music.Error.NoAvailable"), HintType.Error);
                }
                else
                {
                    try
                    {
                        MusicStartPlay(addr, isFirstLoad);
                        if (showHint)
                            HintService.Hint(
                                Lang.Text("Music.Hint.Refreshed", ModBase.GetFileNameFromPath(addr)),
                                HintType.Success,
                                false);
                    }
                    catch
                    {
                        // 容错：播放失败已在 MusicLoop 中处理
                    }
                }
            }

            MusicRefreshUI();
        }

        catch (Exception ex)
        {
            ModBase.Log(
                ex,
                "刷新背景音乐播放失败",
                ModBase.LogLevel.Feedback,
                userSummary: Lang.Text("Music.Error.OperationFailed"));
        }
    }

    private static void MusicStartPlay(string address, bool isFirstLoad = false)
    {
        if (string.IsNullOrEmpty(address))
            return;
        ModBase.Log("[Music] 播放开始：" + address);
        musicCurrent = address;
        ModBase.RunInNewThread(() => MusicLoop(isFirstLoad), "Music", ThreadPriority.BelowNormal);
    }

    public static bool MusicPause()
    {
        if (MusicState != MusicStates.Play)
        {
            ModBase.Log($"[Music] 无需暂停播放，当前状态为 {MusicState}");
            return false;
        }

        ModBase.RunInThread(() =>
        {
            ModBase.Log("[Music] 已暂停播放");
            musicNAudio?.Pause();
            MusicRefreshUI();
        });
        return true;
    }

    public static bool MusicResume()
    {
        if (MusicState == MusicStates.Play || musicAllList.Count == 0)
        {
            ModBase.Log($"[Music] 无需继续播放，当前状态为 {MusicState}");
            return false;
        }

        ModBase.RunInThread(() =>
        {
            ModBase.Log("[Music] 已恢复播放");
            try
            {
                musicNAudio?.Play();
            }
            catch
            {
                // 参考 PR #5415：设备变更后需 Stop + Play
                musicNAudio?.Stop();
                musicNAudio?.Play();
            }

            MusicRefreshUI();
        });
        return true;
    }

    #endregion
}