<?php
// ─── Galleries & images CRUD helpers ───────────────────────────────────────────
// galleries  — gallery names (id, name)
// gallery    — images (i_id, i_file_name, i_file_type, i_project_id, i_created_at)
// Also uses `images` table for standalone uploaded images (img_id, img_file_name).

function db_gallery_list(PDO $pdo): array {
    return $pdo->query("SELECT * FROM galleries ORDER BY name")->fetchAll(PDO::FETCH_ASSOC);
}

function db_gallery_get(PDO $pdo, int $id): ?array {
    $stmt = $pdo->prepare("SELECT * FROM galleries WHERE id = ? LIMIT 1");
    $stmt->execute([$id]);
    return $stmt->fetch(PDO::FETCH_ASSOC) ?: null;
}

function db_gallery_create(PDO $pdo, string $name): int {
    $stmt = $pdo->prepare("INSERT INTO galleries (name) VALUES (?)");
    $stmt->execute([$name]);
    return (int) $pdo->lastInsertId();
}

function db_gallery_update(PDO $pdo, int $id, string $name): bool {
    $stmt = $pdo->prepare("UPDATE galleries SET name = ? WHERE id = ?");
    $stmt->execute([$name, $id]);
    return $stmt->rowCount() > 0;
}

function db_gallery_delete(PDO $pdo, int $id): bool {
    // Delete associated images first, then the gallery record.
    $pdo->prepare("DELETE FROM gallery WHERE i_project_id = ?")->execute([$id]);
    $stmt = $pdo->prepare("DELETE FROM galleries WHERE id = ?");
    $stmt->execute([$id]);
    return $stmt->rowCount() > 0;
}

// Gallery images
function db_gallery_images(PDO $pdo, int $gallery_id): array {
    $stmt = $pdo->prepare("SELECT * FROM gallery WHERE i_project_id = ? ORDER BY i_created_at DESC");
    $stmt->execute([$gallery_id]);
    return $stmt->fetchAll(PDO::FETCH_ASSOC);
}

function db_gallery_image_upload(PDO $pdo, int $gallery_id, array $file): ?string {
    if ($file['error'] !== UPLOAD_ERR_OK) return null;

    $ext  = strtolower(pathinfo($file['name'], PATHINFO_EXTENSION));
    $allowed = ['jpg', 'jpeg', 'png', 'gif', 'webp'];
    if (!in_array($ext, $allowed)) return null;

    $upload_dir = __DIR__ . '/../uploads/gallery/' . $gallery_id . '/';
    if (!is_dir($upload_dir)) @mkdir($upload_dir, 0775, true);

    $filename = bin2hex(random_bytes(16)) . '.' . $ext;
    if (!move_uploaded_file($file['tmp_name'], $upload_dir . $filename)) return null;
    img_optimize($upload_dir . $filename, IMG_MAX_GALLERY);

    $stmt = $pdo->prepare("INSERT INTO gallery (i_file_name, i_file_type, i_project_id) VALUES (?, ?, ?)");
    $stmt->execute([$filename, $file['type'] ?? 'image/jpeg', $gallery_id]);
    return $filename;
}

function db_gallery_image_delete(PDO $pdo, int $image_id, int $gallery_id): bool {
    $stmt = $pdo->prepare("SELECT i_file_name FROM gallery WHERE i_id = ? AND i_project_id = ? LIMIT 1");
    $stmt->execute([$image_id, $gallery_id]);
    $img = $stmt->fetch(PDO::FETCH_ASSOC);
    if ($img) {
        $path = __DIR__ . '/../uploads/gallery/' . $gallery_id . '/' . $img['i_file_name'];
        if (is_file($path)) @unlink($path);
    }
    $stmt = $pdo->prepare("DELETE FROM gallery WHERE i_id = ? AND i_project_id = ?");
    $stmt->execute([$image_id, $gallery_id]);
    return $stmt->rowCount() > 0;
}