const dashboardDateFormatter = new Intl.DateTimeFormat('en-US', {
  month: 'short',
  day: '2-digit',
  year: 'numeric',
  hour: 'numeric',
  minute: '2-digit',
  second: '2-digit'
});

function normalizeUploadRoot(uploadDir) {
  return require('path').resolve(String(uploadDir || '').trim());
}

function formatDashboardDate(value) {
  if (!value) {
    return '';
  }
  const date = new Date(value);
  if (Number.isNaN(date.getTime())) {
    return '';
  }
  return dashboardDateFormatter.format(date);
}

function buildDashboardPayload(state) {
  return JSON.stringify({
    type: 'dashboard-state',
    state: state
  });
}

function readArrayField(body, keys) {
  const searchKeys = Array.isArray(keys) ? keys : [keys];
  for (let i = 0; i < searchKeys.length; i += 1) {
    const key = searchKeys[i];
    const value = body && Object.prototype.hasOwnProperty.call(body, key) ? body[key] : undefined;
    if (Array.isArray(value)) {
      return value.filter(function (item) {
        return item !== undefined && item !== null && String(item).trim() !== '';
      }).map(function (item) {
        return String(item);
      });
    }
    if (value !== undefined && value !== null && String(value).trim() !== '') {
      return [String(value)];
    }
  }
  return [];
}

function parseDateTimeLocal(value) {
  if (!value) {
    return null;
  }
  const date = new Date(String(value));
  return Number.isNaN(date.getTime()) ? null : date;
}

function parseTimeLocal(value) {
  const raw = String(value || '').trim();
  if (!raw) {
    return null;
  }
  if (!/^\d{2}:\d{2}(:\d{2})?$/.test(raw)) {
    return null;
  }
  return raw.length === 5 ? raw + ':00' : raw;
}

function normalizeScheduleMode(value) {
  const mode = String(value || 'always');
  if (mode === 'dates' || mode === 'times') {
    return mode;
  }
  return 'always';
}

function getAuditUserId(req) {
  return req && req.currentUser ? Number(req.currentUser.id) : null;
}

function getCanvasSignature(width, height) {
  const normalizedWidth = Number(width);
  const normalizedHeight = Number(height);
  if (!Number.isFinite(normalizedWidth) || !Number.isFinite(normalizedHeight)) {
    return null;
  }
  return normalizedWidth + 'x' + normalizedHeight;
}

async function fetchPlaylistCanvasSignature(pool, playlistId) {
  const [rows] = await pool.query(
    `SELECT DISTINCT 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
     WHERE ps.playlist_id = ?
       AND cs.width IS NOT NULL
       AND cs.height IS NOT NULL`,
    [playlistId]
  );
  const signatures = Array.from(new Set(rows.map(function (row) {
    return getCanvasSignature(row.canvas_width, row.canvas_height);
  }).filter(Boolean)));
  if (!signatures.length) {
    return null;
  }
  return signatures.length === 1 ? signatures[0] : 'mismatch';
}

async function fetchScreensByPlaylistId(connection, playlistId) {
  const [rows] = await connection.query(
    'SELECT slug FROM screens WHERE playlist_id = ? AND slug IS NOT NULL',
    [playlistId]
  );
  return rows.map(function (row) {
    return row.slug;
  });
}

async function fetchScreensBySlideId(connection, slideId) {
  const [rows] = await connection.query(
    `SELECT DISTINCT s.slug
     FROM screens s
     JOIN playlist_slides ps ON ps.playlist_id = s.playlist_id
     WHERE ps.slide_id = ?
       AND s.slug IS NOT NULL`,
    [slideId]
  );
  return rows.map(function (row) {
    return row.slug;
  });
}

async function fetchScreensByTemplateId(connection, templateId) {
  const [rows] = await connection.query(
    `SELECT DISTINCT s.slug
     FROM screens s
     JOIN playlist_slides ps ON ps.playlist_id = s.playlist_id
     JOIN slides sl ON sl.id = ps.slide_id
     WHERE sl.template_id = ?
       AND s.slug IS NOT NULL`,
    [templateId]
  );
  return rows.map(function (row) {
    return row.slug;
  });
}

async function fetchOrderedPlaylistSlides(connection, playlistId) {
  const [rows] = await connection.query(
    'SELECT id, position FROM playlist_slides WHERE playlist_id = ? ORDER BY position ASC, id ASC',
    [playlistId]
  );
  return rows;
}

function redirectAfterSave(req, res, defaultUrl, options) {
  const safeOptions = options || {};
  const action = String((req && req.body && req.body.action) || req.query.action || '').toLowerCase();
  if (action === 'close') {
    return res.redirect(safeOptions.closeUrl || defaultUrl);
  }
  if (action === 'new') {
    return res.redirect(safeOptions.newUrl || defaultUrl);
  }
  const message = safeOptions.message || '';
  if (message) {
    const joiner = defaultUrl.indexOf('?') === -1 ? '?' : '&';
    return res.redirect(defaultUrl + joiner + 'message=' + encodeURIComponent(message));
  }
  return res.redirect(defaultUrl);
}

module.exports = {
  normalizeUploadRoot: normalizeUploadRoot,
  formatDashboardDate: formatDashboardDate,
  buildDashboardPayload: buildDashboardPayload,
  readArrayField: readArrayField,
  parseDateTimeLocal: parseDateTimeLocal,
  parseTimeLocal: parseTimeLocal,
  normalizeScheduleMode: normalizeScheduleMode,
  getAuditUserId: getAuditUserId,
  getCanvasSignature: getCanvasSignature,
  fetchPlaylistCanvasSignature: fetchPlaylistCanvasSignature,
  fetchScreensByPlaylistId: fetchScreensByPlaylistId,
  fetchScreensBySlideId: fetchScreensBySlideId,
  fetchScreensByTemplateId: fetchScreensByTemplateId,
  fetchOrderedPlaylistSlides: fetchOrderedPlaylistSlides,
  redirectAfterSave: redirectAfterSave
};