@page "/tafsir/{Slug}"
@page "/tafsir/{Slug}/surah/{SurahNumber:int}"
@page "/tafsir/{Slug}/surah/{SurahNumber:int}/ayah/{AyahNumber:int}"
@inject TafsirApiClient Api
@inject IDeviceIdStore DeviceStore
@inject NavigationManager Nav
@inject PlayerSessionService Player

<section class="tafsir-page">
    <header class="page-header page-header-row">
        @if (loadingMeta)
        {
            <SkeletonBlock Variant="lines" Lines="1" />
        }
        else
        {
            <h1 class="page-title-inline">
                <span>@title</span>
                @if (!string.IsNullOrWhiteSpace(author))
                {
                    <span class="title-author">(@author)</span>
                }
            </h1>
            <button type="button" class="back-btn" @onclick="GoBack" aria-label="بازگشت">←</button>
        }
    </header>

    @if (view == View.Surahs)
    {
        @if (loadingSurahs)
        {
            <SkeletonBlock Variant="cards" Lines="8" />
        }
        else
        {
            <div class="surah-grid">
                @foreach (var s in surahs)
                {
                    <div class="surah-card">
                        <button type="button" class="surah-main" @onclick="() => OpenSurah(s.Number)">
                            <span class="surah-num">@s.Number</span>
                            <span class="surah-names">
                                <strong>@s.NameFa</strong>
                                <span class="muted">@s.NameAr</span>
                            </span>
                            <span class="muted">@s.AyahCount آیه</span>
                        </button>
                        <button type="button" class="chip @(s.IsBookmarked ? "on" : null)"
                                @onclick="() => ToggleSurahBookmark(s)">نشان</button>
                    </div>
                }
            </div>
        }
    }
    else if (view == View.Ayahs)
    {
        <h2 class="section-title">سوره @(selectedSurah?.NameFa ?? "…")</h2>
        @if (loadingAyahs)
        {
            <SkeletonBlock Variant="cards" Lines="10" />
        }
        else
        {
            <div class="ayah-list">
                @foreach (var a in ayahs)
                {
                    <button type="button" class="ayah-row" @onclick="() => OpenAyah(a.AyahNumber)">
                        <span class="ayah-num">@a.AyahNumber</span>
                        <span class="ayah-preview">@(a.TextFaPreview ?? "آیه " + a.AyahNumber)</span>
                        <span class="ayah-flags">
                            @if (a.IsFavorite) { <span class="dot fav" title="علاقه"></span> }
                            @if (a.IsBookmarked) { <span class="dot mark" title="نشان"></span> }
                            @if (a.HasAudio) { <span class="dot audio" title="صوت"></span> }
                        </span>
                    </button>
                }
            </div>
        }
    }
    else if (view == View.Detail)
    {
        <div class="ayah-detail">
            <div class="ayah-nav">
                <button type="button" class="chip" disabled="@(detail?.PrevAyah is null)"
                        @onclick="() => GoPrevAyah()">آیه قبل</button>
                <button type="button" class="chip" @onclick="() => OpenSurah(SurahNumber ?? 1)">فهرست آیات</button>
                <button type="button" class="chip" disabled="@(detail?.NextAyah is null)"
                        @onclick="() => GoNextAyah()">آیه بعد</button>
            </div>

            @if (loadingDetail || detail is null)
            {
                <SkeletonBlock Variant="lines" Lines="5" />
                <SkeletonBlock Variant="cards" Lines="2" />
            }
            else
            {
                <div class="ayah-block">
                    <p class="ayah-ar">@detail.TextAr</p>
                    @if (!string.IsNullOrWhiteSpace(detail.TextFa))
                    {
                        <p class="ayah-fa">@detail.TextFa</p>
                    }
                </div>

                @if (!string.IsNullOrWhiteSpace(detail.NotesHtml))
                {
                    <details class="content-block">
                        <summary>نکته‌ها</summary>
                        <div class="html-body">@((MarkupString)detail.NotesHtml)</div>
                    </details>
                }
                @if (!string.IsNullOrWhiteSpace(detail.MessagesHtml))
                {
                    <details class="content-block">
                        <summary>پیام‌ها</summary>
                        <div class="html-body">@((MarkupString)detail.MessagesHtml)</div>
                    </details>
                }
                @if (!string.IsNullOrWhiteSpace(detail.VideoEmbedUrl))
                {
                    <details class="content-block">
                        <summary>فیلم</summary>
                        <div class="video-wrap">
                            <iframe src="@detail.VideoEmbedUrl" allowfullscreen loading="lazy"></iframe>
                        </div>
                    </details>
                }
            }
        </div>
    }
</section>

@code {
    private enum View { Surahs, Ayahs, Detail }

    [Parameter] public string Slug { get; set; } = "";
    [Parameter] public int? SurahNumber { get; set; }
    [Parameter] public int? AyahNumber { get; set; }

    private string title = "تفسیر";
    private string author = "";
    private Guid tafsirId;
    private bool loadingMeta = true;
    private bool loadingSurahs;
    private bool loadingAyahs;
    private bool loadingDetail;
    private string? routeKey;
    private View view = View.Surahs;
    private List<SurahListItemDto> surahs = [];
    private List<AyahListItemDto> ayahs = [];
    private SurahListItemDto? selectedSurah;
    private AyahDetailDto? detail;
    private string deviceId = "";
    private bool ready;

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (!firstRender) return;
        ready = true;
        deviceId = await DeviceStore.GetOrCreateAsync();
        await LoadRouteAsync();
    }

    protected override async Task OnParametersSetAsync()
    {
        if (!ready) return;
        await LoadRouteAsync();
    }

    private async Task LoadRouteAsync()
    {
        var key = $"{Slug}|{SurahNumber}|{AyahNumber}";
        if (routeKey == key) return;
        routeKey = key;

        if (AyahNumber is not null && SurahNumber is not null) view = View.Detail;
        else if (SurahNumber is not null) view = View.Ayahs;
        else view = View.Surahs;

        loadingMeta = true;
        loadingSurahs = view == View.Surahs;
        loadingAyahs = view == View.Ayahs;
        loadingDetail = view == View.Detail;
        detail = null;
        await InvokeAsync(StateHasChanged);

        try
        {
            if (string.IsNullOrWhiteSpace(deviceId))
                deviceId = await DeviceStore.GetOrCreateAsync();

            var tafsirs = await Api.GetTafsirsAsync();
            var tafsir = tafsirs.FirstOrDefault(t => t.Slug == Slug);
            title = tafsir?.Title ?? "تفسیر";
            author = tafsir?.Author ?? "";
            tafsirId = tafsir?.Id ?? Guid.Empty;
            loadingMeta = false;
            await InvokeAsync(StateHasChanged);

            if (view == View.Detail && SurahNumber is int s && AyahNumber is int a)
                await LoadDetail(s, a);
            else if (view == View.Ayahs && SurahNumber is int sn)
                await LoadAyahs(sn);
            else
                await LoadSurahs();
        }
        finally
        {
            loadingMeta = false;
            loadingSurahs = false;
            loadingAyahs = false;
            loadingDetail = false;
            await InvokeAsync(StateHasChanged);
        }
    }

    private void GoBack()
    {
        if (view == View.Detail && SurahNumber is int s)
            Nav.NavigateTo($"/tafsir/{Slug}/surah/{s}");
        else if (view == View.Ayahs)
            Nav.NavigateTo($"/tafsir/{Slug}");
        else
            Nav.NavigateTo("/");
    }

    private void OpenSurah(int n) => Nav.NavigateTo($"/tafsir/{Slug}/surah/{n}");

    private void OpenAyah(int n)
    {
        var s = SurahNumber ?? detail?.SurahNumber ?? selectedSurah?.Number ?? 1;
        Nav.NavigateTo($"/tafsir/{Slug}/surah/{s}/ayah/{n}");
    }

    private void GoPrevAyah()
    {
        if (detail?.PrevAyah is int p) OpenAyah(p);
    }

    private void GoNextAyah()
    {
        if (detail?.NextAyah is int n) OpenAyah(n);
    }

    private async Task LoadSurahs()
    {
        loadingSurahs = true;
        await InvokeAsync(StateHasChanged);
        surahs = (await Api.GetSurahsAsync(deviceId, tafsirId == Guid.Empty ? null : tafsirId)).ToList();
        loadingSurahs = false;
    }

    private async Task LoadAyahs(int surahNumber)
    {
        loadingAyahs = true;
        await InvokeAsync(StateHasChanged);
        if (surahs.Count == 0)
            surahs = (await Api.GetSurahsAsync(deviceId, tafsirId == Guid.Empty ? null : tafsirId)).ToList();
        selectedSurah = surahs.FirstOrDefault(x => x.Number == surahNumber);
        ayahs = (await Api.GetAyahsAsync(Slug, surahNumber, deviceId)).ToList();
        loadingAyahs = false;
    }

    private async Task LoadDetail(int surahNumber, int ayahNumber)
    {
        loadingDetail = true;
        await InvokeAsync(StateHasChanged);
        detail = await Api.GetAyahAsync(Slug, surahNumber, ayahNumber);
        loadingDetail = false;
        await InvokeAsync(StateHasChanged);

        if (detail is null) return;
        tafsirId = detail.TafsirId;

        var resumePos = Player.HasTrack
                        && Player.SurahNumber == surahNumber
                        && Player.AyahNumber == ayahNumber
            ? Player.PositionSeconds
            : 0;
        await Player.SetTrackAsync(detail, resumePos);
    }

    private async Task ToggleSurahBookmark(SurahListItemDto s)
    {
        if (tafsirId == Guid.Empty) return;
        if (s.IsBookmarked)
            await Api.RemoveSurahBookmarkAsync(tafsirId, s.Number, deviceId);
        else
            await Api.AddSurahBookmarkAsync(new ToggleSurahBookmarkRequest(tafsirId, s.Number, deviceId));
        surahs = (await Api.GetSurahsAsync(deviceId, tafsirId)).ToList();
    }
}