@using Microsoft.Extensions.Options
@using LANCommander.Server.Settings
@using LANCommander.Server.Services.Abstractions
@using LANCommander.Server.Services.Models
@using Microsoft.EntityFrameworkCore
@using System.Net.Mime
@using LANCommander.UI.Providers
@inject MediaService MediaService
@inject GameService GameService
@inject IMediaGrabberService MediaGrabberService
@inject ModalService ModalService
@inject IMessageService MessageService
@inject IOptions<Settings> Settings
@inject ILogger<GameDetailPreview> Logger
@inject ScriptProvider ScriptProvider

<div class="game-detail-preview">
    <!-- ══ Hero Section ═══════════════════════════════════════════ -->
    <div class="game-detail-preview__hero">
        @{
            var bgMedia = GetMedia(MediaType.Background);
            var bgUrl = GetMediaUrl(bgMedia);
        }

        @if (bgUrl != null)
        {
            <img class="game-detail-preview__hero-bg" src="@bgUrl" />
        }

        <div class="game-detail-preview__hero-gradient-top"></div>
        <div class="game-detail-preview__hero-gradient-bottom"></div>

        <!-- Background upload overlay -->
        <div class="game-detail-preview__media-overlay game-detail-preview__media-overlay--hero">
            <div class="game-detail-preview__media-overlay-actions">
                @{ var bgInputId = "bg-upload-" + Guid.NewGuid(); }
                <InputFile id="@bgInputId" OnChange="(e) => UploadMediaByType(e, MediaType.Background)" hidden accept=".jpg,.jpeg,.png,.gif,.webp" />
                <label class="game-detail-preview__overlay-btn" for="@bgInputId" title="Upload Background">
                    <Icon Type="@IconType.Outline.Upload" />
                </label>
                <button class="game-detail-preview__overlay-btn" @onclick="() => SearchMediaByType(MediaType.Background)" title="Search Background">
                    <Icon Type="@IconType.Outline.Search" />
                </button>
                @if (bgMedia != null)
                {
                    <button class="game-detail-preview__overlay-btn game-detail-preview__overlay-btn--danger" @onclick="() => RemoveMediaByType(MediaType.Background)" title="Remove Background">
                        <Icon Type="@IconType.Outline.Delete" />
                    </button>
                }
            </div>
            <span class="game-detail-preview__media-overlay-label">Background</span>
        </div>

        <!-- Logo (bottom-left) -->
        <div class="game-detail-preview__logo-area">
            @{
                var logoMedia = GetMedia(MediaType.Logo);
                var logoUrl = GetMediaUrl(logoMedia);
            }

            @if (logoUrl != null)
            {
                <img class="game-detail-preview__logo-img" src="@logoUrl" />
            }
            else
            {
                <span class="game-detail-preview__title-fallback">@_game?.Title</span>
            }

            <!-- Logo upload overlay -->
            <div class="game-detail-preview__media-overlay game-detail-preview__media-overlay--logo">
                <div class="game-detail-preview__media-overlay-actions">
                    @{ var logoInputId = "logo-upload-" + Guid.NewGuid(); }
                    <InputFile id="@logoInputId" OnChange="(e) => UploadMediaByType(e, MediaType.Logo)" hidden accept=".jpg,.jpeg,.png,.gif,.webp" />
                    <label class="game-detail-preview__overlay-btn" for="@logoInputId" title="Upload Logo">
                        <Icon Type="@IconType.Outline.Upload" />
                    </label>
                    <button class="game-detail-preview__overlay-btn" @onclick="() => SearchMediaByType(MediaType.Logo)" title="Search Logo">
                        <Icon Type="@IconType.Outline.Search" />
                    </button>
                    @if (logoMedia != null)
                    {
                        <button class="game-detail-preview__overlay-btn game-detail-preview__overlay-btn--danger" @onclick="() => RemoveMediaByType(MediaType.Logo)" title="Remove Logo">
                            <Icon Type="@IconType.Outline.Delete" />
                        </button>
                    }
                </div>
                <span class="game-detail-preview__media-overlay-label">Logo</span>
            </div>
        </div>
    </div>

    <!-- ══ Content Grid ═══════════════════════════════════════════ -->
    <div class="game-detail-preview__content">

        <!-- Left Column -->
        <div class="game-detail-preview__left">
            <!-- Description -->
            @if (!string.IsNullOrWhiteSpace(_game?.Description))
            {
                <p class="game-detail-preview__description">@_game.Description</p>
            }

            <!-- Screenshots & Videos Carousel -->
            <div class="game-detail-preview__media-section">
                <div class="game-detail-preview__media-section-header">
                    <span class="game-detail-preview__media-section-title">Media</span>
                    <div class="game-detail-preview__media-section-actions">
                        <InputFile id="@_ssInputId" OnChange="(e) => UploadMediaByType(e, MediaType.Screenshot)" hidden accept=".jpg,.jpeg,.png,.gif,.webp" multiple />
                        <InputFile id="@_vidInputId" OnChange="(e) => UploadMediaByType(e, MediaType.Video)" hidden accept=".mp4,.webm,.mkv" multiple />

                        <Dropdown>
                            <Overlay>
                                <Menu Mode="MenuMode.Vertical">
                                    <SubMenu Key="screenshot" Title="Screenshot">
                                        <MenuItem OnClick="() => ClickFileInput(_ssInputId)">
                                            <Icon Type="@IconType.Outline.Upload" /> Upload
                                        </MenuItem>
                                        <MenuItem OnClick="() => SearchMediaByType(MediaType.Screenshot)">
                                            <Icon Type="@IconType.Outline.Search" /> Search
                                        </MenuItem>
                                    </SubMenu>
                                    <SubMenu Key="video" Title="Video">
                                        <MenuItem OnClick="() => ClickFileInput(_vidInputId)">
                                            <Icon Type="@IconType.Outline.Upload" /> Upload
                                        </MenuItem>
                                        <MenuItem OnClick="() => SearchMediaByType(MediaType.Video)">
                                            <Icon Type="@IconType.Outline.Search" /> Search
                                        </MenuItem>
                                    </SubMenu>
                                </Menu>
                            </Overlay>
                            <ChildContent>
                                <Button Size="@ButtonSize.Small" Type="ButtonType.Text">
                                    <Icon Type="@IconType.Outline.Plus" />
                                </Button>
                            </ChildContent>
                        </Dropdown>
                    </div>
                </div>

                <div class="game-detail-preview__carousel">
                    @foreach (var media in GetMediaList(MediaType.Screenshot, MediaType.Video))
                    {
                        <div class="game-detail-preview__carousel-item">
                            @if (media.Type == MediaType.Video)
                            {
                                <video class="game-detail-preview__carousel-video" src="@GetMediaDownloadUrl(media)" muted loop />
                                <div class="game-detail-preview__carousel-video-badge">
                                    <Icon Type="@IconType.Outline.PlayCircle" />
                                </div>
                            }
                            else
                            {
                                <img class="game-detail-preview__carousel-img" src="@GetMediaDownloadUrl(media)" />
                            }
                            <div class="game-detail-preview__carousel-item-overlay">
                                <button class="game-detail-preview__overlay-btn" @onclick="() => MoveMediaLeft(media)" title="Move Left">
                                    <Icon Type="@IconType.Outline.Left" />
                                </button>
                                <button class="game-detail-preview__overlay-btn" @onclick="() => MoveMediaRight(media)" title="Move Right">
                                    <Icon Type="@IconType.Outline.Right" />
                                </button>
                                <Popconfirm Title="Remove this media?" OnConfirm="() => RemoveMedia(media)">
                                    <button class="game-detail-preview__overlay-btn game-detail-preview__overlay-btn--danger" title="Remove">
                                        <Icon Type="@IconType.Outline.Delete" />
                                    </button>
                                </Popconfirm>
                            </div>
                        </div>
                    }

                    @if (!GetMediaList(MediaType.Screenshot, MediaType.Video).Any())
                    {
                        <div class="game-detail-preview__carousel-empty">
                            <Empty Description="@("No screenshots or videos")" Simple />
                        </div>
                    }
                </div>
            </div>
        </div>

        <!-- Right Column -->
        <div class="game-detail-preview__right">
            <!-- Cover Image -->
            <div class="game-detail-preview__cover-wrapper">
                @{
                    var coverMedia = GetMedia(MediaType.Cover);
                    var coverUrl = GetMediaUrl(coverMedia);
                }

                @if (coverUrl != null && coverMedia?.MimeType?.StartsWith("video/") == true)
                {
                    <video class="game-detail-preview__cover-img" src="@coverUrl" autoplay muted loop />
                }
                else if (coverUrl != null)
                {
                    <img class="game-detail-preview__cover-img" src="@coverUrl" />
                }
                else
                {
                    <div class="game-detail-preview__cover-placeholder">
                        <span>@_game?.Title</span>
                    </div>
                }

                <!-- Cover upload overlay -->
                <div class="game-detail-preview__media-overlay game-detail-preview__media-overlay--cover">
                    <div class="game-detail-preview__media-overlay-actions">
                        @{ var coverInputId = "cover-upload-" + Guid.NewGuid(); }
                        <InputFile id="@coverInputId" OnChange="(e) => UploadMediaByType(e, MediaType.Cover)" hidden accept=".jpg,.jpeg,.png,.gif,.webp,.apng,.mp4,.webm,.mkv" />
                        <label class="game-detail-preview__overlay-btn" for="@coverInputId" title="Upload Cover">
                            <Icon Type="@IconType.Outline.Upload" />
                        </label>
                        <button class="game-detail-preview__overlay-btn" @onclick="() => SearchMediaByType(MediaType.Cover)" title="Search Cover">
                            <Icon Type="@IconType.Outline.Search" />
                        </button>
                        @if (coverMedia != null)
                        {
                            <button class="game-detail-preview__overlay-btn game-detail-preview__overlay-btn--danger" @onclick="() => RemoveMediaByType(MediaType.Cover)" title="Remove Cover">
                                <Icon Type="@IconType.Outline.Delete" />
                            </button>
                        }
                    </div>
                    <span class="game-detail-preview__media-overlay-label">Cover</span>
                </div>
            </div>

            <!-- Metadata Badges -->
            @if (_game?.Singleplayer == true || (_game?.MultiplayerModes?.Any() ?? false))
            {
                <div class="game-detail-preview__badge-section">
                    <span class="game-detail-preview__badge-header">Players</span>
                    <div class="game-detail-preview__badge-wrap">
                        @if (_game.Singleplayer)
                        {
                            <span class="game-detail-preview__badge">Singleplayer</span>
                        }
                        @if (_game.MultiplayerModes != null)
                        {
                            @foreach (var mode in _game.MultiplayerModes)
                            {
                                <span class="game-detail-preview__badge">
                                    @mode.Type.GetDisplayName()
                                    @if (mode.MinPlayers > 0 && mode.MaxPlayers > 0)
                                    {
                                        <text> &middot; @mode.MinPlayers–@mode.MaxPlayers players</text>
                                    }
                                </span>
                            }
                        }
                    </div>
                </div>
            }

            @if (_game?.Developers?.Any() == true)
            {
                <div class="game-detail-preview__badge-section">
                    <span class="game-detail-preview__badge-header">Developers</span>
                    <div class="game-detail-preview__badge-wrap">
                        @foreach (var dev in _game.Developers)
                        {
                            <span class="game-detail-preview__badge">@dev.Name</span>
                        }
                    </div>
                </div>
            }

            @if (_game?.Publishers?.Any() == true)
            {
                <div class="game-detail-preview__badge-section">
                    <span class="game-detail-preview__badge-header">Publishers</span>
                    <div class="game-detail-preview__badge-wrap">
                        @foreach (var pub in _game.Publishers)
                        {
                            <span class="game-detail-preview__badge">@pub.Name</span>
                        }
                    </div>
                </div>
            }

            @if (_game?.Genres?.Any() == true)
            {
                <div class="game-detail-preview__badge-section">
                    <span class="game-detail-preview__badge-header">Genres</span>
                    <div class="game-detail-preview__badge-wrap">
                        @foreach (var genre in _game.Genres)
                        {
                            <span class="game-detail-preview__badge">@genre.Name</span>
                        }
                    </div>
                </div>
            }

            @if (_game?.Tags?.Any() == true)
            {
                <div class="game-detail-preview__badge-section">
                    <span class="game-detail-preview__badge-header">Tags</span>
                    <div class="game-detail-preview__badge-wrap">
                        @foreach (var tag in _game.Tags)
                        {
                            <span class="game-detail-preview__badge">@tag.Name</span>
                        }
                    </div>
                </div>
            }
        </div>
    </div>
</div>

@code {
    [CascadingParameter(Name = "GameId")] public Guid GameId { get; set; }

    string _ssInputId = "ss-upload-" + Guid.NewGuid();
    string _vidInputId = "vid-upload-" + Guid.NewGuid();

    string[] ValidImageMimeTypes = [
        MediaTypeNames.Image.Png,
        MediaTypeNames.Image.Jpeg,
        MediaTypeNames.Image.Gif,
        MediaTypeNames.Image.Webp,
        "image/apng",
    ];

    string[] ValidVideoMimeTypes = [
        "video/mp4",
        "video/webm",
        "video/x-matroska"
    ];

    string[] ValidCoverMimeTypes = [
        MediaTypeNames.Image.Png,
        MediaTypeNames.Image.Jpeg,
        MediaTypeNames.Image.Gif,
        MediaTypeNames.Image.Webp,
        "image/apng",
        "video/mp4",
        "video/webm",
        "video/x-matroska"
    ];

    List<Media> _media = new();
    Game _game;
    IJSObjectReference _domHelper;

    protected override async Task OnInitializedAsync()
    {
        _game = await GameService.Query(q =>
            {
                return q
                    .Include(g => g.Media)
                    .ThenInclude(m => m.StorageLocation)
                    .Include(g => g.Developers)
                    .Include(g => g.Publishers)
                    .Include(g => g.Genres)
                    .Include(g => g.Tags)
                    .Include(g => g.MultiplayerModes);
            })
            .GetAsync(GameId);

        _media = _game.Media?.ToList() ?? new();
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
            _domHelper = await ScriptProvider.ImportModuleAsync("DomHelper");
    }

    async Task ClickFileInput(string inputId) =>
        await _domHelper.InvokeVoidAsync("ClickElement", inputId);

    Media? GetMedia(MediaType type) =>
        _media.FirstOrDefault(m => m.Type == type);

    string? GetMediaUrl(Media? media) =>
        media != null && MediaService.FileExists(media)
            ? $"/api/Media/{media.Id}/Download?fileId={media.FileId}&v={media.UpdatedOn.Ticks}"
            : null;

    string GetMediaDownloadUrl(Media media) =>
        $"/api/Media/{media.Id}/Download?fileId={media.FileId}&v={media.UpdatedOn.Ticks}";

    List<Media> GetMediaList(params MediaType[] types) =>
        _media.Where(m => types.Contains(m.Type) && MediaService.FileExists(m))
              .OrderBy(m => m.SortOrder)
              .ToList();

    async Task UploadMediaByType(InputFileChangeEventArgs e, MediaType type)
    {
        var validTypes = type switch
        {
            MediaType.Video => ValidVideoMimeTypes,
            MediaType.Cover => ValidCoverMimeTypes,
            _ => ValidImageMimeTypes
        };
        var config = Settings.Value.Server.Media.GetMediaTypeConfig(type);
        var isSingular = type != MediaType.Screenshot && type != MediaType.Video;

        foreach (var file in e.GetMultipleFiles())
        {
            if (!validTypes.Contains(file.ContentType))
            {
                MessageService.Error($"Unsupported file type: {file.Name}");
                continue;
            }

            if (file.Size > config.MaxFileSize)
            {
                MessageService.Error($"File size must be smaller than {ByteSizeLib.ByteSize.FromBytes(config.MaxFileSize)}: {file.Name}");
                continue;
            }

            // For singular types (Background, Logo, Cover), replace existing
            var existing = isSingular ? GetMedia(type) : null;

            Media media;

            if (existing != null)
            {
                media = existing;
                media.MimeType = file.ContentType;
                media.SourceUrl = "";

                MediaService.DeleteLocalMediaFile(media);
                media = await MediaService.WriteToFileAsync(media, file.OpenReadStream(maxAllowedSize: config.MaxFileSize));
                await MediaService.UpdateAsync(media);
            }
            else
            {
                media = new Media
                {
                    GameId = GameId,
                    Type = type,
                    MimeType = file.ContentType,
                    SourceUrl = "",
                    StorageLocation = await MediaService.GetDefaultStorageLocationAsync(),
                    Crc32 = string.Empty,
                    SortOrder = GetNextSortOrder(type)
                };

                media = await MediaService.WriteToFileAsync(media, file.OpenReadStream(maxAllowedSize: config.MaxFileSize));
            }
        }

        await RefreshMedia();
        MessageService.Success($"{type} uploaded!");
    }

    async Task SearchMediaByType(MediaType type)
    {
        var multiSelect = type == MediaType.Screenshot || type == MediaType.Video;

        var modalOptions = new ModalOptions
        {
            Title = $"Download {type}",
            Maximizable = false,
            DefaultMaximized = true,
            Closable = true,
            OkText = "Select",
        };

        var grabberOptions = new MediaGrabberOptions
        {
            Type = type,
            Search = _game.Title,
            MultiSelect = multiSelect
        };

        var modalRef = await ModalService.CreateModalAsync<MediaGrabberDialog, MediaGrabberOptions, MediaGrabberDownloadResult>(modalOptions, grabberOptions);

        modalRef.OnOk = async (downloadResult) =>
        {
            if (multiSelect && downloadResult.Results.Any())
            {
                foreach (var entry in downloadResult.Results)
                {
                    using var download = entry.Download;

                    var media = new Media
                    {
                        GameId = GameId,
                        Type = type,
                        SourceUrl = entry.Result.SourceUrl,
                        MimeType = download.MimeType,
                        StorageLocation = await MediaService.GetDefaultStorageLocationAsync(),
                        Crc32 = string.Empty,
                        SortOrder = GetNextSortOrder(type)
                    };

                    await MediaService.WriteToFileAsync(media, download.Stream);
                }

                await RefreshMedia();
                return;
            }

            using var singleDownload = downloadResult.Download;

            var isSingular = type != MediaType.Screenshot && type != MediaType.Video;
            var existing = isSingular ? GetMedia(type) : null;

            Media singleMedia;

            if (existing != null)
            {
                singleMedia = existing;
                singleMedia.SourceUrl = downloadResult.Result.SourceUrl;
                singleMedia.MimeType = singleDownload.MimeType;

                MediaService.DeleteLocalMediaFile(singleMedia);
                singleMedia = await MediaService.WriteToFileAsync(singleMedia, singleDownload.Stream);
            }
            else
            {
                singleMedia = new Media
                {
                    GameId = GameId,
                    Type = type,
                    SourceUrl = downloadResult.Result.SourceUrl,
                    MimeType = singleDownload.MimeType,
                    StorageLocation = await MediaService.GetDefaultStorageLocationAsync(),
                    Crc32 = string.Empty,
                    SortOrder = GetNextSortOrder(type)
                };

                singleMedia = await MediaService.WriteToFileAsync(singleMedia, singleDownload.Stream);
            }

            await RefreshMedia();
        };
    }

    async Task RemoveMediaByType(MediaType type)
    {
        var media = GetMedia(type);

        if (media != null)
            await RemoveMedia(media);
    }

    async Task RemoveMedia(Media media)
    {
        _media.Remove(media);

        if (media.Id != Guid.Empty)
            await MediaService.DeleteAsync(media);

        await InvokeAsync(StateHasChanged);
    }

    int GetNextSortOrder(MediaType type)
    {
        var existing = _media.Where(m => m.Type == type).ToList();
        return existing.Any() ? existing.Max(m => m.SortOrder) + 1 : 0;
    }

    async Task NormalizeSortOrders()
    {
        var list = _media
            .Where(m => m.Type == MediaType.Screenshot || m.Type == MediaType.Video)
            .OrderBy(m => m.SortOrder)
            .ThenBy(m => m.CreatedOn)
            .ToList();

        for (int i = 0; i < list.Count; i++)
        {
            if (list[i].SortOrder != i)
            {
                list[i].SortOrder = i;
                await MediaService.UpdateAsync(list[i]);
            }
        }
    }

    async Task MoveMediaLeft(Media media)
    {
        await NormalizeSortOrders();

        var list = GetMediaList(MediaType.Screenshot, MediaType.Video);
        var index = list.IndexOf(media);

        if (index <= 0)
            return;

        // Swap sort orders
        (list[index].SortOrder, list[index - 1].SortOrder) = (list[index - 1].SortOrder, list[index].SortOrder);

        await MediaService.UpdateAsync(list[index]);
        await MediaService.UpdateAsync(list[index - 1]);
        await RefreshMedia();
    }

    async Task MoveMediaRight(Media media)
    {
        await NormalizeSortOrders();

        var list = GetMediaList(MediaType.Screenshot, MediaType.Video);
        var index = list.IndexOf(media);

        if (index < 0 || index >= list.Count - 1)
            return;

        // Swap sort orders
        (list[index].SortOrder, list[index + 1].SortOrder) = (list[index + 1].SortOrder, list[index].SortOrder);

        await MediaService.UpdateAsync(list[index]);
        await MediaService.UpdateAsync(list[index + 1]);
        await RefreshMedia();
    }

    async Task RefreshMedia()
    {
        _media = (await MediaService.Include(m => m.StorageLocation).GetAsync(m => m.GameId == GameId)).ToList();
        await InvokeAsync(StateHasChanged);
    }
}