<?php
/**
 * Per-gallery editor: settings, share link, proxied bulk uploader
 * (browser → webhost → S3), and image removal.
 */
require dirname(__DIR__) . '/app/bootstrap.php';
auth_require();

$gallery = gallery_load((string)($_GET['g'] ?? ''));
if ($gallery === null) {
    flash_set('Gallery not found.', 'error');
    redirect('galleries.php');
}
$slug = $gallery['slug'];

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    csrf_verify();
    $action = $_POST['action'] ?? '';

    if ($action === 'settings') {
        $gallery['title'] = trim((string)($_POST['title'] ?? '')) ?: $gallery['title'];
        $gallery['expires_at'] = trim((string)($_POST['expires_at'] ?? '')) ?: null;
        // Unlike the fields above there is no keep-current fallback: the select
        // always posts, and an empty value genuinely means "back to Original".
        $gallery['max_resolution'] = parse_max_resolution($_POST);
        if (!empty($_POST['remove_password'])) {
            $gallery['password_hash'] = null;
        } elseif (($pw = (string)($_POST['password'] ?? '')) !== '') {
            $gallery['password_hash'] = password_hash($pw, PASSWORD_DEFAULT);
        }
        gallery_save($gallery);
        flash_set('Gallery settings saved.');
        redirect('gallery-edit.php?g=' . rawurlencode($slug));
    }

    if ($action === 'uploads') {
        $mode = (string)($_POST['mode'] ?? '');
        if ($mode === 'enable' && empty($gallery['upload_key'])) {
            $gallery['upload_key'] = random_token(24);
            gallery_save($gallery);
            flash_set('Guest uploads enabled.');
        } elseif ($mode === 'regenerate') {
            $gallery['upload_key'] = random_token(24);
            gallery_save($gallery);
            flash_set('New upload link generated; the old link no longer works.');
        } elseif ($mode === 'disable') {
            $gallery['upload_key'] = null;
            gallery_save($gallery);
            flash_set('Guest uploads disabled.');
        }
        redirect('gallery-edit.php?g=' . rawurlencode($slug));
    }

    if ($action === 'downloads') {
        $gallery['downloads_enabled'] = !empty($_POST['enabled']);
        gallery_save($gallery);
        if ($gallery['downloads_enabled']) {
            // Queue the first build; the background worker picks it up once the
            // gallery has been quiet for archive.settle_seconds.
            archive_mark_dirty($slug, $gallery);
            flash_set('Downloads enabled. The archive will be built in the background.');
        } else {
            archive_delete($slug);
            flash_set('Downloads disabled and the archive removed.');
        }
        redirect('gallery-edit.php?g=' . rawurlencode($slug));
    }

    if ($action === 'delete-image') {
        $key = (string)($_POST['key'] ?? '');
        foreach ($gallery['images'] ?? [] as $i => $img) {
            if (($img['key'] ?? '') === $key) {
                s3_delete($img['key']);
                if (!empty($img['thumb'])) {
                    s3_delete($img['thumb']);
                }
                array_splice($gallery['images'], $i, 1);
                gallery_save($gallery);
                // The archive no longer matches the gallery's contents.
                archive_mark_dirty($slug, $gallery);
                flash_set('Image deleted.');
                break;
            }
        }
        redirect('gallery-edit.php?g=' . rawurlencode($slug));
    }
}

// Build the share link from the page the admin is currently on, not from config,
// so it matches whatever host/path this app is actually served under.
$scheme  = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') ? 'https' : 'http';
$host    = $_SERVER['HTTP_HOST'] ?? 'localhost';
// The site root is one directory up from admin/ (cf. the "../gallery/" link below).
$basePath = str_replace('\\', '/', dirname(dirname($_SERVER['SCRIPT_NAME'] ?? '/admin/gallery-edit.php')));
$basePath = rtrim($basePath, '/');
$shareUrl = $scheme . '://' . $host . $basePath . '/gallery/?g=' . rawurlencode($slug);
// Guest upload link (only when a key is set). Same host/path derivation as above.
$uploadUrl = !empty($gallery['upload_key'])
    ? $scheme . '://' . $host . $basePath . '/upload.php?g=' . rawurlencode($slug)
        . '&k=' . rawurlencode($gallery['upload_key'])
    : '';

admin_header($gallery['title'], 'galleries');
flash_render();
?>
<h1><?= e($gallery['title']) ?></h1>
<p class="help" style="margin-bottom:1.5rem">
    Share link: <a href="../gallery/?g=<?= e(rawurlencode($slug)) ?>" target="_blank" rel="noopener"><?= e($shareUrl) ?></a>
</p>

<div class="card">
    <h2 style="margin-top:0">Upload images</h2>
    <div class="dropzone" id="dropzone"
         data-api="api.php"
         data-slug="<?= e($slug) ?>"
         data-csrf="<?= e(csrf_token()) ?>"
         data-thumb-size="<?= (int)config('uploads.thumb_size', 600) ?>"
         data-thumb-quality="<?= e((string)config('uploads.thumb_quality', 0.8)) ?>"
         data-concurrency="<?= (int)config('uploads.concurrency', 3) ?>"
         data-max-resolution="<?= (int)($gallery['max_resolution'] ?? 0) ?>"
         data-resize-quality="<?= e((string)config('uploads.resize_quality', 0.9)) ?>">
        Drop images here or click to select.<br>
        <small>
            <?php if (isset($gallery['max_resolution'])): ?>
                Uploaded through the site to S3, downscaled to <?= (int)$gallery['max_resolution'] ?> px on the longest edge.
            <?php else: ?>
                Uploaded through the site to S3, in full resolution, unmodified.
            <?php endif; ?>
        </small>
    </div>
    <input type="file" id="file-input" accept="image/*" multiple style="display:none">
    <div class="upload-list" id="upload-list"></div>
</div>

<div class="card">
    <h2 style="margin-top:0">Guest uploads</h2>
    <?php if ($uploadUrl !== ''): ?>
        <p class="help" style="margin-bottom:1rem">
            Share this link so guests can upload into this gallery without an admin
            account. It is key-protected and honors the gallery's password and
            expiry, if set.
        </p>
        <p style="margin-bottom:1rem">
            <a href="<?= e($uploadUrl) ?>" target="_blank" rel="noopener"><?= e($uploadUrl) ?></a>
        </p>
        <form method="post" style="display:inline"
              onsubmit="return confirm('Generate a new link? The current link will stop working.')">
            <?= csrf_field() ?>
            <input type="hidden" name="action" value="uploads">
            <input type="hidden" name="mode" value="regenerate">
            <button style="margin:0">Regenerate link</button>
        </form>
        <form method="post" style="display:inline"
              onsubmit="return confirm('Disable guest uploads? The link will stop working.')">
            <?= csrf_field() ?>
            <input type="hidden" name="action" value="uploads">
            <input type="hidden" name="mode" value="disable">
            <button class="btn-danger" style="margin:0">Disable</button>
        </form>
    <?php else: ?>
        <p class="help" style="margin-bottom:1rem">
            Guest uploads are disabled. Enable them to get a shareable link that
            lets people upload into this gallery without an admin account.
        </p>
        <form method="post">
            <?= csrf_field() ?>
            <input type="hidden" name="action" value="uploads">
            <input type="hidden" name="mode" value="enable">
            <button style="margin:0">Enable guest uploads</button>
        </form>
    <?php endif; ?>
</div>

<?php $status = archive_status($gallery); ?>
<div class="card" id="archive-card"
     data-api="archive-api.php"
     data-slug="<?= e($slug) ?>"
     data-csrf="<?= e(csrf_token()) ?>">
    <h2 style="margin-top:0">Download all</h2>
    <p class="help" style="margin-bottom:1rem">
        Offers visitors a single ZIP of every photo. It is assembled once and
        stored on S3, so the download itself never runs through this webhost —
        and it is rebuilt automatically whenever images are added or removed.
        While a rebuild is pending the button on the gallery is disabled, so
        nobody receives an archive that is missing the newest photos.
    </p>

    <form method="post" style="margin-bottom:1rem">
        <?= csrf_field() ?>
        <input type="hidden" name="action" value="downloads">
        <input type="hidden" name="enabled" value="<?= empty($gallery['downloads_enabled']) ? '1' : '0' ?>">
        <?php if (empty($gallery['downloads_enabled'])): ?>
            <button style="margin:0">Enable downloads</button>
        <?php else: ?>
            <button class="btn-danger" style="margin:0"
                    onclick="return confirm('Disable downloads and delete the archive from S3?')">
                Disable downloads
            </button>
        <?php endif; ?>
    </form>

    <?php if (!empty($gallery['downloads_enabled'])): ?>
        <p id="archive-status" class="help" style="margin-bottom:.6rem">
            <?php if ($status['archive'] && !$status['stale']): ?>
                Ready · <?= e(human_bytes((int)$status['archive']['size'])) ?>
                · <?= (int)$status['archive']['count'] ?> photos
                · built <?= e($status['archive']['built_at']) ?>
            <?php elseif ($status['building']): ?>
                Building — <?= (int)$status['done'] ?> of <?= (int)$status['total'] ?> photos done.
            <?php elseif ($status['queued'] && $status['due_in'] > 0): ?>
                Queued — the rebuild starts in about <?= (int)ceil($status['due_in'] / 60) ?> min.
            <?php elseif ($status['queued']): ?>
                Queued — the rebuild starts shortly.
            <?php elseif ($status['archive']): ?>
                Out of date — the archive does not match the current images.
            <?php else: ?>
                No archive yet.
            <?php endif; ?>
        </p>

        <div id="archive-bar" class="archive-bar" hidden><span></span></div>

        <button id="archive-build" style="margin:0"
                <?= $status['building'] ? 'data-resume="1"' : '' ?>>
            <?= $status['building'] ? 'Resume build' : ($status['archive'] ? 'Rebuild now' : 'Build now') ?>
        </button>
        <button id="archive-cancel" class="btn-ghost" style="margin:0" hidden>Cancel</button>
        <script src="../assets/archive.js" defer></script>
    <?php endif; ?>
</div>

<form method="post" class="card">
    <?= csrf_field() ?>
    <input type="hidden" name="action" value="settings">
    <h2 style="margin-top:0">Settings</h2>
    <label for="t">Title</label>
    <input type="text" id="t" name="title" value="<?= e($gallery['title']) ?>">
    <label for="ex">Expiry date (blank = never)</label>
    <input type="date" id="ex" name="expires_at" value="<?= e($gallery['expires_at'] ?? '') ?>">
    <?php resolution_field(isset($gallery['max_resolution']) ? (int)$gallery['max_resolution'] : null) ?>
    <label for="p">Set new password (blank = keep current)</label>
    <input type="text" id="p" name="password" autocomplete="off">
    <?php if (!empty($gallery['password_hash'])): ?>
        <p class="help"><label style="display:inline;text-transform:none;letter-spacing:0">
            <input type="checkbox" name="remove_password" value="1"> Remove password protection
        </label></p>
    <?php endif; ?>
    <button type="submit">Save settings</button>
</form>

<h2>Images (<span id="img-count"><?= count($gallery['images'] ?? []) ?></span>)</h2>
<div class="thumb-row">
    <?php foreach ($gallery['images'] ?? [] as $img): ?>
    <figure>
        <img src="<?= e(s3_presign_get($img['thumb'] ?? $img['key'])) ?>" alt="" loading="lazy">
        <figcaption title="<?= e($img['name'] ?? '') ?>"><?= e($img['name'] ?? '') ?></figcaption>
        <form method="post" onsubmit="return confirm('Delete this image from S3?')">
            <?= csrf_field() ?>
            <input type="hidden" name="action" value="delete-image">
            <input type="hidden" name="key" value="<?= e($img['key']) ?>">
            <button>✕</button>
        </form>
    </figure>
    <?php endforeach; ?>
</div>

<script src="../assets/admin.js"></script>
<?php admin_footer(); ?>