// Announcement data access helpers.

const { fetchPagedRows } = require('./utils');
const {
  ANNOUNCEMENT_ICON_KEYS,
  DEFAULT_ANNOUNCEMENT_ICON,
  normalizeAnnouncementIcon: normalizeAnnouncementIconFromConfig
} = require('./announcement-icons');
const { validateMaxLength } = require('./utils');

const SHORT_LABEL_MAX_LENGTH = 255;

const ANNOUNCEMENT_TYPES = ['lower-third', 'fullscreen', 'top-banner'];
const ANNOUNCEMENT_COLORS = ['primary', 'secondary', 'success', 'info', 'warning', 'danger', 'dark', 'light'];

function normalizeAnnouncementType(value) {
  const normalized = String(value || '').trim().toLowerCase();
  if (normalized === 'center-card') {
    return 'fullscreen';
  }
  return ANNOUNCEMENT_TYPES.includes(normalized) ? normalized : 'lower-third';
}

function normalizeAnnouncementColor(value) {
  const normalized = String(value || '').trim().toLowerCase();
  return ANNOUNCEMENT_COLORS.includes(normalized) ? normalized : 'primary';
}

function normalizeAnnouncementMessage(value) {
  return String(value || '').replace(/\r\n/g, '\n').trim();
}

function normalizeAnnouncementShortLabel(value) {
  return String(value || '').replace(/\r\n/g, ' ').trim();
}

function normalizeAnnouncementDurationSeconds(value) {
  const seconds = Math.max(0, Math.round(Number(value) || 0));
  return seconds > 0 ? seconds : null;
}

function normalizeAnnouncementScreenIds(value) {
  if (Array.isArray(value)) {
    return value.map(function (screenId) {
      return Number(screenId) || 0;
    }).filter(function (screenId) {
      return screenId > 0;
    });
  }

  return String(value || '')
    .split(',')
    .map(function (screenId) {
      return Number(screenId) || 0;
    })
    .filter(function (screenId) {
      return screenId > 0;
    });
}

function buildAnnouncementPayload(input) {
  const message = normalizeAnnouncementMessage(input && input.message);
  const shortLabel = validateMaxLength(normalizeAnnouncementShortLabel(input && input.short_label), SHORT_LABEL_MAX_LENGTH, 'Announcement short description');
  const announcementType = normalizeAnnouncementType(input && input.announcement_type);
  const colorKey = normalizeAnnouncementColor(input && input.color_key);
  const iconKey = normalizeAnnouncementIconFromConfig(input && input.icon_key);
  const durationSeconds = normalizeAnnouncementDurationSeconds(input && input.duration_seconds);

  return {
    message,
    shortLabel,
    announcementType,
    colorKey,
    iconKey,
    durationSeconds,
    expiresAt: durationSeconds ? new Date(Date.now() + (durationSeconds * 1000)) : null
  };
}

function normalizeAnnouncementRow(row) {
  if (!row) {
    return null;
  }

  return {
    id: Number(row.id) || null,
    message: normalizeAnnouncementMessage(row.message),
    short_label: normalizeAnnouncementShortLabel(row.short_label),
    announcement_type: normalizeAnnouncementType(row.announcement_type),
    color_key: normalizeAnnouncementColor(row.color_key),
    icon_key: normalizeAnnouncementIconFromConfig(row.icon_key),
    duration_seconds: row.duration_seconds === null || row.duration_seconds === undefined
      ? null
      : Math.max(0, Math.round(Number(row.duration_seconds) || 0)),
    expires_at: row.expires_at || null,
    screen_target_count: row.screen_target_count === null || row.screen_target_count === undefined
      ? null
      : Math.max(0, Math.round(Number(row.screen_target_count) || 0)),
    total_screen_count: row.total_screen_count === null || row.total_screen_count === undefined
      ? null
      : Math.max(0, Math.round(Number(row.total_screen_count) || 0)),
    screen_targets_label: String(row.screen_targets_label || '').trim(),
    screen_ids: normalizeAnnouncementScreenIds(row.screen_ids),
    created_at: row.created_at || null,
    modified_at: row.modified_at || null,
    created_by: row.created_by || null,
    modified_by: row.modified_by || null
  };
}

async function fetchAnnouncementById(pool, id) {
  const [rows] = await pool.query(`
    SELECT a.id, a.message, a.short_label, a.announcement_type, a.color_key, a.icon_key, a.duration_seconds, a.expires_at, a.created_at, a.modified_at, a.created_by, a.modified_by,
           GROUP_CONCAT(DISTINCT aas.screen_id ORDER BY aas.screen_id SEPARATOR ',') AS screen_ids
    FROM d_announcements a
    LEFT JOIN d_announcement_screens aas ON aas.announcement_id = a.id
    WHERE a.id = ?
    GROUP BY a.id
  `, [id]);
  return normalizeAnnouncementRow(rows[0] || null);
}

async function fetchAnnouncementsPage(pool, page, pageSize, searchTerm, sortKey, sortDirection) {
  const paged = await fetchPagedRows(pool, {
    selectSql: `SELECT a.id, a.message, a.short_label, a.announcement_type, a.color_key, a.icon_key, a.duration_seconds, a.expires_at, a.created_at, a.modified_at, a.created_by, a.modified_by,
                       COUNT(DISTINCT aas.screen_id) AS screen_target_count,
                       (SELECT COUNT(*) FROM d_screens) AS total_screen_count,
                       COALESCE(
                         GROUP_CONCAT(DISTINCT COALESCE(NULLIF(TRIM(s.name), ''), s.slug) ORDER BY COALESCE(NULLIF(TRIM(s.name), ''), s.slug) SEPARATOR ', '),
                         ''
                       ) AS screen_targets_label
                FROM d_announcements a
                LEFT JOIN d_announcement_screens aas ON aas.announcement_id = a.id
                LEFT JOIN d_screens s ON s.id = aas.screen_id
                GROUP BY a.id`,
    countSql: 'SELECT COUNT(*) AS count FROM d_announcements',
    searchColumns: ['message', 'short_label', 'announcement_type', 'color_key'],
    searchTerm: searchTerm,
    sortColumns: {
      description: 'short_label',
      message: 'message',
      type: 'announcement_type',
      color: 'color_key',
      status: 'expires_at',
      expires: 'expires_at',
      created: 'created_at',
      modified: 'modified_at'
    },
    sortKey: sortKey,
    sortDirection: sortDirection,
    page: page,
    pageSize: pageSize
  });

  return Object.assign({ announcements: (paged.rows || []).map(normalizeAnnouncementRow) }, paged);
}

async function fetchActiveAnnouncement(pool, screenSlug) {
  const [rows] = await pool.query(`
    SELECT a.id, a.message, a.short_label, a.announcement_type, a.color_key, a.icon_key, a.duration_seconds, a.expires_at, a.created_at, a.modified_at, a.created_by, a.modified_by,
           GROUP_CONCAT(DISTINCT aas.screen_id ORDER BY aas.screen_id SEPARATOR ',') AS screen_ids
    FROM d_announcements a
    LEFT JOIN d_announcement_screens aas ON aas.announcement_id = a.id
    WHERE (a.expires_at IS NULL OR a.expires_at > CURRENT_TIMESTAMP)
      AND EXISTS (
        SELECT 1
        FROM d_announcement_screens restriction
        JOIN d_screens screen ON screen.id = restriction.screen_id
        WHERE restriction.announcement_id = a.id
          AND screen.slug = ?
      )
    GROUP BY a.id
    ORDER BY a.modified_at DESC, a.created_at DESC, a.id DESC
    LIMIT 1
  `, [screenSlug]);
  return normalizeAnnouncementRow(rows[0] || null);
}

module.exports = {
  ANNOUNCEMENT_TYPES,
  ANNOUNCEMENT_COLORS,
  ANNOUNCEMENT_ICONS: ANNOUNCEMENT_ICON_KEYS,
  DEFAULT_ANNOUNCEMENT_ICON,
  normalizeAnnouncementType,
  normalizeAnnouncementColor,
  normalizeAnnouncementIcon: normalizeAnnouncementIconFromConfig,
  normalizeAnnouncementShortLabel,
  buildAnnouncementPayload,
  fetchAnnouncementById,
  fetchAnnouncementsPage,
  fetchActiveAnnouncement
};