@page "/playlist/{slug}"
@using System.Security.Claims
@using Microsoft.AspNetCore.Components.Authorization
@using Microsoft.EntityFrameworkCore
@using PlaylistShared.Data.Entities
@inject AuthenticationStateProvider AuthenticationStateProvider
@inject AppDbContext Db
@inject IYandexMusicService YandexService
@inject IJSRuntime Js
@inject HttpClient Http

<h3>@playlist?.Title</h3>
<p>Владелец: @playlist?.Owner?.UserName</p>
<p>Описание: @playlist?.Description</p>

@if (canAdd)
{
    <div class="mb-3">
        <input type="text" id="trackId" placeholder="ID трека Яндекс.Музыки" class="form-control" />
        <input type="text" id="trackTitle" placeholder="Название трека" class="form-control mt-1" />
        <input type="text" id="artistName" placeholder="Исполнитель" class="form-control mt-1" />
        <button class="btn btn-primary mt-2" id="addTrackBtn">Добавить</button>
    </div>
}

<ul id="trackList" class="list-group">
    @foreach (var track in tracks)
    {
        <li class="list-group-item d-flex justify-content-between align-items-center" data-track-id="@track.YandexTrackId">
            <div>
                <strong>@track.Title</strong> - @track.Artist
            </div>
            @if (canDelete(track))
            {
                <button class="btn btn-sm btn-danger deleteTrackBtn" data-track-id="@track.YandexTrackId">Удалить</button>
            }
        </li>
    }
</ul>

@code {
    [Parameter] public string slug { get; set; } = "";

    private SharedPlaylist? playlist;
    private List<PlaylistTrack> tracks = new();
    private bool canAdd;
    private string? currentUserId;

    protected override async Task OnInitializedAsync()
    {
        var authState = await AuthenticationStateProvider.GetAuthenticationStateAsync();
        currentUserId = authState.User.FindFirst(ClaimTypes.NameIdentifier)?.Value;

        playlist = await Db.SharedPlaylists
            .Include(p => p.Owner)
            .Include(p => p.Tracks)
            .FirstOrDefaultAsync(p => p.ShareSlug == slug);
        if (playlist == null) return;

        canAdd = playlist.Permissions.Add switch
        {
            AccessLevel.All => true,
            AccessLevel.Authorized => currentUserId != null,
            _ => false
        };

        // Здесь можно при желании синхронизировать с Яндекс API, но пока используем локальный кеш
        // var yandexTracks = await YandexService.GetPlaylistTracksAsync(playlist.OwnerUserId, playlist.YandexPlaylistId);
        tracks = playlist.Tracks.OrderBy(t => t.AddedAt).ToList();
    }

    private bool canDelete(PlaylistTrack track)
    {
        if (currentUserId == playlist?.OwnerUserId) return true;
        return playlist?.Permissions.Delete switch
        {
            DeleteAccessLevel.All => true,
            DeleteAccessLevel.Authorized => currentUserId != null,
            DeleteAccessLevel.AdderOnly => currentUserId != null && currentUserId == track.AddedByUserId,
            DeleteAccessLevel.OwnerOnly => false,
            _ => false
        };
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender && playlist != null)
        {
            await Js.InvokeVoidAsync("initPlaylistInteractions", playlist.Id);
        }
    }
}