async function fetchAdminData(pool) {
  const [playlists] = await pool.query('SELECT id, name, fade_between_slides, created_at, modified_at, created_by, modified_by FROM playlists ORDER BY id DESC');
  const [canvasSizes] = await pool.query('SELECT id, name, width, height, created_at, modified_at, created_by, modified_by FROM canvas_sizes ORDER BY width ASC, height ASC, name ASC');
  const [templates] = await pool.query(`
    SELECT st.id, st.name, st.canvas_size_id, st.background_image_path, st.background_color, st.created_at, st.modified_at,
           cs.name AS canvas_size_name, cs.width AS canvas_size_width, cs.height AS canvas_size_height
    FROM slide_templates st
    LEFT JOIN canvas_sizes cs ON cs.id = st.canvas_size_id
    ORDER BY st.id DESC
  `);
  const [templateRegions] = await pool.query('SELECT id, template_id, region_key, region_type, label, font_family, x, y, width, height, z_index, created_at, modified_at, created_by, modified_by FROM slide_template_regions ORDER BY template_id ASC, z_index ASC, id ASC');
  const [slides] = await pool.query(`
    SELECT s.id, s.title, s.body, s.template_id, s.content_json, s.media_path, s.media_type, s.created_at, s.modified_at, s.created_by, s.modified_by, st.name AS template_name, cs.width AS canvas_width, cs.height AS canvas_height
    FROM slides s
    LEFT JOIN slide_templates st ON st.id = s.template_id
    LEFT JOIN canvas_sizes cs ON cs.id = st.canvas_size_id
    ORDER BY s.id DESC
  `);
  const [screens] = await pool.query(`
    SELECT s.id, s.name, s.slug, s.playlist_id, s.created_at, s.modified_at, s.created_by, s.modified_by, p.name AS playlist_name
    FROM screens s
    LEFT JOIN playlists p ON p.id = s.playlist_id
    ORDER BY s.id DESC
  `);
  const [playlistSlides] = await pool.query(`
    SELECT ps.id, ps.playlist_id, ps.position, ps.duration_seconds, ps.schedule_mode, ps.schedule_start_datetime, ps.schedule_end_datetime, ps.schedule_start_time, ps.schedule_end_time, ps.schedule_days_json, sl.id AS slide_id, sl.title, sl.media_path, sl.media_type, cs.width AS canvas_width, cs.height AS canvas_height
    FROM playlist_slides ps
    JOIN slides sl ON sl.id = ps.slide_id
    LEFT JOIN slide_templates st ON st.id = sl.template_id
    LEFT JOIN canvas_sizes cs ON cs.id = st.canvas_size_id
    ORDER BY ps.playlist_id ASC, ps.position ASC, ps.id ASC
  `);
  return { playlists, canvasSizes, templates, templateRegions, slides, screens, playlistSlides };
}

module.exports = {
  fetchAdminData
};