@page "/tracks/mixes"
@using DeepDrftManager.Services
@using DeepDrftModels.DTOs
@using DeepDrftModels.Enums
@attribute [Authorize]
@inject ICmsReleaseService CmsReleaseService
@inject ISnackbar Snackbar
@inject ILogger<CmsMixBrowser> Logger

<PageTitle>Mixes — DeepDrft CMS</PageTitle>

<MudContainer MaxWidth="MaxWidth.Large" Class="mt-8">
    <MudButton Variant="Variant.Text"
               StartIcon="@Icons.Material.Filled.ArrowBack"
               Href="/tracks/archive"
               Class="mb-4">
        Back to Release Archive
    </MudButton>

    <MudText Typo="Typo.h4" GutterBottom="true">Mixes</MudText>

    @if (_loading)
    {
        <MudProgressCircular Indeterminate="true" Class="mt-4" />
    }
    else if (_rows.Count == 0)
    {
        <MudText Typo="Typo.body1" Class="mt-4">No mixes found.</MudText>
    }
    else
    {
        <MudTable T="MixRow" Items="_rows" Hover="true" Striped="true" Dense="true" Bordered="false" FixedHeader="true">
            <HeaderContent>
                <MudTh Style="width: 1%;">Cover</MudTh>
                <MudTh>Mix</MudTh>
                <MudTh>Artist</MudTh>
                <MudTh Style="width: 1%; white-space: nowrap;">Waveform</MudTh>
                <MudTh Style="width: 1%; white-space: nowrap;">Actions</MudTh>
            </HeaderContent>
            <RowTemplate>
                <MudTd DataLabel="Cover">
                    @if (!string.IsNullOrEmpty(context.Release.ImagePath))
                    {
                        <div class="cms-album-thumb" style="background-image: url('@ThumbUrl(context.Release.ImagePath)');"></div>
                    }
                    else
                    {
                        <div class="cms-album-thumb cms-album-thumb--fallback"></div>
                    }
                </MudTd>
                <MudTd DataLabel="Mix">@context.Release.Title</MudTd>
                <MudTd DataLabel="Artist">@context.Release.Artist</MudTd>
                <MudTd DataLabel="Waveform">
                    @if (context.HasWaveform)
                    {
                        <MudTooltip Text="Waveform generated">
                            <MudIcon Icon="@Icons.Material.Filled.CheckCircle" Color="Color.Success" Size="Size.Small" />
                        </MudTooltip>
                    }
                    else
                    {
                        <MudTooltip Text="No waveform — incomplete">
                            <MudIcon Icon="@Icons.Material.Filled.Cancel" Color="Color.Warning" Size="Size.Small" />
                        </MudTooltip>
                    }
                </MudTd>
                <MudTd DataLabel="Actions">
                    <MudButton Variant="Variant.Outlined"
                               Size="Size.Small"
                               StartIcon="@Icons.Material.Filled.GraphicEq"
                               Disabled="@context.IsGenerating"
                               OnClick="@(() => GenerateWaveformAsync(context))">
                        @if (context.IsGenerating)
                        {
                            <MudProgressCircular Class="mr-2" Size="Size.Small" Indeterminate="true" />
                            <span>Generating…</span>
                        }
                        else
                        {
                            <span>@(context.HasWaveform ? "Regenerate" : "Generate")</span>
                        }
                    </MudButton>
                </MudTd>
            </RowTemplate>
        </MudTable>
    }
</MudContainer>

@code {
    private List<MixRow> _rows = new();
    private bool _loading = true;

    protected override async Task OnInitializedAsync() => await LoadAsync();

    private async Task LoadAsync()
    {
        _loading = true;
        // Mixes are single-track releases; a single generous page covers the CMS catalogue.
        var result = await CmsReleaseService.GetPagedAsync(
            ReleaseMedium.Mix, page: 1, pageSize: 100,
            sortColumn: "Title", sortDescending: false);

        if (result.Success && result.Value is not null)
        {
            _rows = result.Value.Items
                .Select(r => new MixRow
                {
                    Release = r,
                    HasWaveform = !string.IsNullOrEmpty(r.MixMetadata?.WaveformEntryKey)
                })
                .ToList();
        }
        else
        {
            var error = result.Messages.FirstOrDefault()?.Message ?? "Unknown error";
            Snackbar.Add($"Failed to load mixes: {error}", Severity.Error);
            _rows = new List<MixRow>();
        }
        _loading = false;
    }

    // Relative path — resolves against the Manager's own origin, proxied by ImageProxyController.
    private static string ThumbUrl(string entryKey) =>
        $"/api/image/{Uri.EscapeDataString(entryKey)}";

    private async Task GenerateWaveformAsync(MixRow row)
    {
        row.IsGenerating = true;
        StateHasChanged();
        try
        {
            var result = await CmsReleaseService.GenerateMixWaveformAsync(row.Release.Id);
            if (result.Success)
            {
                // Optimistic update: the trigger succeeded, so the waveform is stored. Unlike SessionBrowser's
                // re-fetch (which retrieves the server-generated HeroImageEntryKey), there is nothing to reflect
                // back here — HasWaveform is derived from WaveformEntryKey being non-null, which we know is now set.
                row.HasWaveform = true;
                Snackbar.Add($"Generated waveform for '{row.Release.Title}'.", Severity.Success);
            }
            else
            {
                var error = result.Messages.FirstOrDefault()?.Message ?? "Unknown error";
                Snackbar.Add($"Waveform generation failed for '{row.Release.Title}': {error}", Severity.Error);
            }
        }
        catch (Exception ex)
        {
            Logger.LogError(ex, "Waveform generation failed for release {ReleaseId}", row.Release.Id);
            Snackbar.Add($"Waveform generation failed for '{row.Release.Title}' — please try again.", Severity.Error);
        }
        finally
        {
            row.IsGenerating = false;
            StateHasChanged();
        }
    }

    private sealed class MixRow
    {
        public required ReleaseDto Release { get; set; }
        public bool HasWaveform { get; set; }
        public bool IsGenerating { get; set; }
    }
}