@using Microsoft.JSInterop
@inject IAudioPlayerService AudioPlayerService
@inject IJSRuntime JS
@inject TokenStorage TokenStorage
@inject PlayerStorage PlayerStorage
@inject AuthenticationStateProvider AuthProvider
@inject ISnackbar Snackbar
@inject HttpClient Http

<MudPaper Class="pa-4" Elevation="0" Width="100%" Style="background-color: rgba(0,0,0,0.05); border-radius: 8px;">
    <div style="display: flex; align-items: center; gap: 12px; flex-wrap: wrap;">
        <div style="display: flex; align-items: center; gap: 12px;">
            @if (!string.IsNullOrEmpty(_currentTrackCoverUrl))
            {
                <MudImage Src="@_currentTrackCoverUrl" Height="40" Width="40" Class="rounded" />
            }
            <MudText Typo="Typo.body1" Style="font-weight: 500;">@_currentTrackTitle</MudText>
        </div>

        <div style="display: flex; gap: 8px;">
            <MudIconButton Icon="@(_isPlaying? Icons.Material.Filled.Pause : Icons.Material.Filled.PlayArrow)"
                           Size="Size.Medium"
                           Color="Color.Primary"
                           OnClick="TogglePlayPause" />
            <MudIconButton Icon="@Icons.Material.Filled.Stop"
                           Size="Size.Medium"
                           Color="Color.Default"
                           OnClick="Stop" />
        </div>

        <div style="flex-grow: 1; min-width: 150px;">
            <MudSlider @bind-Value="_currentProgress"
                       @bind-Value:event="oninput"
                       Min="0"
                       Max="100"
                       Size="Size.Small"
                       ValueChanged="@((double newValue) => SeekTo(newValue))" />
        </div>

        <div style="display: flex; align-items: center; gap: 12px;">
            <MudText Typo="Typo.body2">@_currentTime / @_totalTime</MudText>
            <div style="display: flex; align-items: center; gap: 8px; width: 120px;">
                <MudIconButton Icon="@(_currentVolume == 0 ? Icons.Material.Filled.VolumeOff : Icons.Material.Filled.VolumeUp)"
                               Size="Size.Small"
                               Color="Color.Default"
                               OnClick="ToggleMute" />
                <MudSlider @bind-Value="_currentVolume"
                           @bind-Value:event="oninput"
                           Min="0"
                           Max="100"
                           Size="Size.Small"
                           ValueChanged="@((double newValue) => ChangeVolume(newValue))" />
            </div>
        </div>
    </div>
</MudPaper>

<audio id="@_audioId" style="display: none;"></audio>

@code {
    private const double _defaultVolume = 50;

    private string _audioId = $"audio_{Guid.NewGuid():N}";
    private IJSObjectReference? _audioModule;
    private IJSObjectReference? _audioElement;
    private double _currentProgress;
    private double _currentVolume = _defaultVolume;
    private string _currentTime = "0:00";
    private string _totalTime = "0:00";
    private bool _isPlaying;
    private Timer? _progressTimer;
    private bool _isMuted;
    private string? _currentAccessToken;
    private string? _currentSharedPlaylistId;
    private string? _currentTrackCoverUrl;
    private string? _currentTrackTitle;

    protected override async Task OnInitializedAsync()
    {
        AudioPlayerService.OnLoadAndPlayRequested += OnLoadAndPlay;
        AudioPlayerService.OnPlayRequested += OnPlay;
        AudioPlayerService.OnPauseRequested += OnPause;
        AudioPlayerService.OnStopRequested += OnStop;
        AudioPlayerService.OnSeekRequested += OnSeek;
        AudioPlayerService.OnVolumeChangeRequested += OnVolumeChange;
        AudioPlayerService.OnStateChanged += OnStateChanged;
    
        await LoadSavedVolume();
        await AudioPlayerService.SetVolumeAsync(_currentVolume); // синхронизация
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
        {
            await EnsureAudioModuleAsync();
        }
    }
    
    private void OnStateChanged()
    {
        _currentTrackTitle = AudioPlayerService.CurrentTrackTitle;
        _currentTrackCoverUrl = AudioPlayerService.CurrentTrackCoverUrl?.FormatCoverUrl(40, 40);
        InvokeAsync(StateHasChanged);
    }

    private async Task LoadSavedVolume()
    {
        var savedVolume = await PlayerStorage.GetVolumeAsync() ?? _defaultVolume;
        _currentVolume = savedVolume;
        await AudioPlayerService.SetVolumeAsync(savedVolume);
    }

    private async Task EnsureAudioModuleAsync()
    {
        if (_audioModule == null)
            _audioModule = await JS.InvokeAsync<IJSObjectReference>("import", "/js/AudioPlayer.js");
        if (_audioElement == null)
            _audioElement = await _audioModule.InvokeAsync<IJSObjectReference>("init", _audioId, DotNetObjectReference.Create(this));
    }

    [JSInvokable]
    public async Task OnAudioEnded()
    {
        AudioPlayerService.NotifyTrackEnded();
        _isPlaying = false;
        _currentProgress = 0;
        StopProgressTimer();
        StateHasChanged();
    }

    [JSInvokable]
    public async Task OnTimeUpdate(double currentTime, double duration)
    {
        if (double.IsNaN(currentTime) || double.IsNaN(duration) || duration <= 0) return;
        var progress = (currentTime / duration) * 100;
        var currentTimeStr = FormatTime(currentTime);
        var totalTimeStr = FormatTime(duration);
        AudioPlayerService.UpdateProgress(progress, currentTimeStr, totalTimeStr);
        _currentProgress = progress;
        _currentTime = currentTimeStr;
        _totalTime = totalTimeStr;
        await InvokeAsync(StateHasChanged);
    }

    [JSInvokable]
    public async Task OnDurationReady(double duration)
    {
        if (duration <= 0) return;
        _totalTime = FormatTime(duration);
        await InvokeAsync(StateHasChanged);
    }

    private async Task<bool> CheckAuthAsync()
    {
        var authState = await AuthProvider.GetAuthenticationStateAsync();
        if (!authState.User.Identity?.IsAuthenticated == true)
        {
            Snackbar.Add("Воспроизведение доступно только авторизованным пользователям", Severity.Warning);
            return false;
        }
        return true;
    }

    private async Task OnLoadAndPlay(string trackId, string? accessToken, string? sharedPlaylistId)
    {
        //if (!await CheckAuthAsync()) return;
        
        var tokens = await TokenStorage.GetTokensAsync();
        _currentAccessToken = accessToken ?? tokens.token;
        _currentSharedPlaylistId = sharedPlaylistId;
        
        if (string.IsNullOrWhiteSpace(_currentAccessToken) && string.IsNullOrWhiteSpace(_currentSharedPlaylistId))
        {
            Snackbar.Add("Токен авторизации не найден. Пожалуйста, войдите заново.", Severity.Error);
            return;
        }
        
        var streamUrl = new Uri(Http.BaseAddress!, $"/api/audio/track/{trackId}").ToString();
        await EnsureAudioModuleAsync();
        await _audioElement!.InvokeVoidAsync("loadAndPlay", streamUrl, _currentAccessToken, _currentSharedPlaylistId);
        _isPlaying = true;
        StartProgressTimer();
        StateHasChanged();
    }

    private async Task OnPlay()
    {
        if (_audioElement == null) return;
        await _audioElement.InvokeVoidAsync("play");
        _isPlaying = true;
        StartProgressTimer();
        StateHasChanged();
    }

    private async Task OnPause()
    {
        if (_audioElement == null) return;
        await _audioElement.InvokeVoidAsync("pause");
        _isPlaying = false;
        StopProgressTimer();
        StateHasChanged();
    }

    private async Task OnStop()
    {
        if (_audioElement == null) return;
        await _audioElement.InvokeVoidAsync("stop");
        _isPlaying = false;
        _currentProgress = 0;
        StopProgressTimer();
        StateHasChanged();
    }

    private async Task OnSeek(double percent)
    {
        if (_audioElement == null) return;
        try
        {
            var duration = await _audioElement.InvokeAsync<double>("getDuration");
            if (duration > 0 && !double.IsNaN(duration))
            {
                var newTime = (percent / 100) * duration;
                await _audioElement.InvokeVoidAsync("setCurrentTime", newTime);
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Seek error: {ex.Message}");
        }
    }

    private async Task OnVolumeChange(double volume)
    {
        if (_audioElement == null) return;
        try
        {
            await _audioElement.InvokeVoidAsync("setVolume", volume / 100);
            _isMuted = false;
            _currentVolume = volume;
            await PlayerStorage.SetVolumeAsync(volume);
            StateHasChanged();
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Volume change error: {ex.Message}");
        }
    }

    private async Task TogglePlayPause()
    {
        if (_isPlaying)
            await AudioPlayerService.PauseAsync();
        else
            await AudioPlayerService.PlayAsync();
    }

    private async Task Stop()
    {
        await AudioPlayerService.StopAsync();
    }

    private async Task SeekTo(double value)
    {
        await AudioPlayerService.SeekToAsync(value);
    }

    private async Task ChangeVolume(double value)
    {
        await AudioPlayerService.SetVolumeAsync(value);
    }

    private async Task ToggleMute()
    {
        _isMuted = !_isMuted;
        var newVolume = _isMuted ? 0 : _currentVolume;
        await AudioPlayerService.SetVolumeAsync(newVolume);
    }

    private void StartProgressTimer()
    {
        StopProgressTimer();
        _progressTimer = new Timer(async _ => await UpdateProgress(), null, 0, 500);
    }

    private void StopProgressTimer() => _progressTimer?.Dispose();

    private async Task UpdateProgress()
    {
        if (_audioElement == null) return;
        try
        {
            var current = await _audioElement.InvokeAsync<double>("getCurrentTime");
            var duration = await _audioElement.InvokeAsync<double>("getDuration");
            if (duration > 0 && !double.IsNaN(duration) && !double.IsNaN(current))
            {
                var progress = (current / duration) * 100;
                var currentTime = FormatTime(current);
                var totalTime = FormatTime(duration);
                AudioPlayerService.UpdateProgress(progress, currentTime, totalTime);
                _currentProgress = progress;
                _currentTime = currentTime;
                _totalTime = totalTime;
                await InvokeAsync(StateHasChanged);
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"UpdateProgress error: {ex.Message}");
        }
    }

    private string FormatTime(double seconds)
    {
        var total = (int)seconds;
        var mins = total / 60;
        var secs = total % 60;
        return $"{mins}:{secs:D2}";
    }

    public async ValueTask DisposeAsync()
    {
        try
        {
            StopProgressTimer();
            if (_audioElement != null)
                await _audioElement.DisposeAsync();
            if (_audioModule != null)
                await _audioModule.DisposeAsync();
        }
        catch { }
    }
}