@model List<CatherineLynwood.Models.SoundtrackTrackModel>
@{
    ViewData["Title"] = "Alpha Flame • Soundtrack";
}

<section class="container my-4" id="soundtrack">
    <header class="mb-4">
        <h1 class="h2">The Alpha Flame • Soundtrack</h1>
        <p class="text-muted mb-0">Eight original tracks inspired by key chapters; listen while you read…</p>
    </header>

    <div class="row gy-4">
        @if (Model != null && Model.Any())
        {
            var index = 0;
            foreach (var track in Model)
            {
                var id = $"track-{index++}";
                <div class="col-12">
                    <article class="card shadow-sm h-100">
                        <div class="row g-0 align-items-stretch">
                            <!-- Image + Play/Pause -->
                            <div class="col-12 col-md-5 col-lg-3">
                                <div class="position-relative h-100">
                                    <responsive-image src="@track.ImageUrl" class="img-fluid w-100 h-100 object-fit-cover rounded-start" alt="@track.Title image" display-width-percentage="50"></responsive-image>
                                    <button type="button"
                                            class="btn btn-light btn-lg rounded-circle position-absolute top-50 start-50 translate-middle track-toggle"
                                            aria-label="Play @track.Title"
                                            data-audio-id="@id">
                                        <i class="fad fa-play"></i>
                                    </button>
                                </div>
                            </div>

                            <!-- Text -->
                            <div class="col-12 col-md-7 col-lg-9">
                                <div class="card-body d-flex flex-column">
                                    <h2 class="h4 mb-2">@track.Title</h2>
                                    @if (!string.IsNullOrWhiteSpace(track.Chapter) || !string.IsNullOrWhiteSpace(track.Description))
                                    {
                                        <p class="text-muted small mb-3">
                                            @if (!string.IsNullOrWhiteSpace(track.Chapter))
                                            {
                                                <span><strong>Chapter:</strong> @track.Chapter</span>
                                            }
                                            @if (!string.IsNullOrWhiteSpace(track.Chapter) && !string.IsNullOrWhiteSpace(track.Description))
                                            {
                                                <span> • </span>
                                            }
                                            @if (!string.IsNullOrWhiteSpace(track.Description))
                                            {
                                                <span>@track.Description</span>
                                            }
                                        </p>
                                    }

                                    <div class="lyrics border rounded p-3 mb-3 overflow-auto"
                                         style="max-height: 300px;">
                                        @if (!string.IsNullOrWhiteSpace(track.LyricsHtml))
                                        {
                                            @Html.Raw(track.LyricsHtml)
                                        }
                                    </div>

                                    <div class="mt-auto">
                                        <button type="button"
                                                class="btn btn-outline-dark me-2 track-toggle"
                                                aria-label="Play @track.Title"
                                                data-audio-id="@id">
                                            <i class="fad fa-play me-1"></i> <span>Play</span>
                                        </button>
                                        <span class="text-muted small" data-duration-for="@id"></span>
                                    </div>

                                    <!-- Hidden audio element -->
                                    <audio id="@id"
                                           preload="metadata"
                                           src="\audio\soundtrack\@track.AudioUrl"
                                           data-title="@track.Title"></audio>
                                </div>
                            </div>
                        </div>
                    </article>
                </div>
            }
        }
        else
        {
            <div class="col-12">
                <div class="alert alert-info">
                    Tracks will appear here soon.
                </div>
            </div>
        }
    </div>

    <noscript>
        <div class="alert alert-warning mt-4">Enable JavaScript to play the soundtrack.</div>
    </noscript>
</section>

<style>
    /* Keep images nicely cropped */
    .object-fit-cover { object-fit: cover; }

    /* Make the overlay button stand out on varied artwork */
    .track-toggle.btn-light {
        --bs-btn-bg: rgba(255,255,255,.9);
        --bs-btn-border-color: rgba(0,0,0,.05);
        box-shadow: 0 0.5rem 1rem rgba(0,0,0,.15);
        width: 3.25rem;
        height: 3.25rem;
        display: grid;
        place-items: center;
    }
    .track-toggle .fa-play, .track-toggle .fa-pause { font-size: 1.25rem; }
</style>

@section Scripts {
    <script>
        (function () {
            const cards = document.querySelectorAll('#soundtrack article.card');
            const toggles = document.querySelectorAll('.track-toggle');
            const audios = Array.from(document.querySelectorAll('#soundtrack audio'));

            function setAllToStopped(exceptId) {
                audios.forEach(a => {
                    if (a.id !== exceptId) {
                        a.pause();
                        a.currentTime = a.currentTime; // stop updating without resetting
                        updateUI(a, false);
                    }
                });
            }

            function formatTime(seconds) {
                const s = Math.round(seconds);
                const m = Math.floor(s / 60);
                const r = s % 60;
                return `${m}:${r.toString().padStart(2, '0')}`;
            }

            function updateUI(audio, isPlaying) {
                // Update both toggles for this track
                const buttons = document.querySelectorAll(`.track-toggle[data-audio-id="${audio.id}"]`);
                buttons.forEach(btn => {
                    const icon = btn.querySelector('i');
                    const labelSpan = btn.querySelector('span');
                    if (isPlaying) {
                        btn.setAttribute('aria-label', `Pause ${audio.dataset.title}`);
                        if (icon) { icon.classList.remove('fa-play'); icon.classList.add('fa-pause'); }
                        if (labelSpan) { labelSpan.textContent = 'Pause'; }
                    } else {
                        btn.setAttribute('aria-label', `Play ${audio.dataset.title}`);
                        if (icon) { icon.classList.remove('fa-pause'); icon.classList.add('fa-play'); }
                        if (labelSpan) { labelSpan.textContent = 'Play'; }
                    }
                });
            }

            // Wire up buttons
            toggles.forEach(btn => {
                btn.addEventListener('click', () => {
                    const id = btn.getAttribute('data-audio-id');
                    const audio = document.getElementById(id);
                    if (!audio) return;

                    if (audio.paused) {
                        setAllToStopped(id);
                        audio.play().then(() => updateUI(audio, true)).catch(() => { /* ignore */ });
                    } else {
                        audio.pause();
                        updateUI(audio, false);
                    }
                });
            });

            // Keep UI in sync with media events
            audios.forEach(audio => {
                audio.addEventListener('play', () => {
                    setAllToStopped(audio.id);
                    updateUI(audio, true);
                });
                audio.addEventListener('pause', () => updateUI(audio, false));
                audio.addEventListener('ended', () => {
                    audio.currentTime = 0;
                    updateUI(audio, false);
                });
                audio.addEventListener('loadedmetadata', () => {
                    const slot = document.querySelector(`[data-duration-for="${audio.id}"]`);
                    if (slot && isFinite(audio.duration)) {
                        slot.textContent = `Length: ${formatTime(audio.duration)}`;
                    }
                });
            });
        })();
    </script>
}