const fs = require('fs');
const path = require('path');

const BOOTSTRAP_ICON_CSS_PATH = path.join(__dirname, '..', 'web', 'public', 'adminlte', 'bootstrap-icons', 'css', 'bootstrap-icons.min.css');

const DEFAULT_ANNOUNCEMENT_ICON_KEYS = [
  'megaphone-fill', 'megaphone', 'bell-fill', 'bell',
  'exclamation-triangle-fill', 'exclamation-triangle', 'info-circle-fill', 'info-circle',
  'check-circle-fill', 'check-circle', 'lightbulb-fill', 'lightbulb',
  'calendar-event-fill', 'calendar-event', 'clock-fill', 'clock',
  'wifi-off', 'wifi', 'hdd-network', 'hdd-network-fill',
  'speaker-fill', 'speaker', 'shield-fill', 'shield',
  'collection-play-fill', 'collection-play', 'broadcast', 'broadcast-pin',
  'plug-fill', 'plug', 'lightning-charge-fill', 'lightning-charge',
  'car-front-fill', 'car-front', 'lamp-fill', 'lamp',
  'envelope-fill', 'envelope', 'people-fill', 'people',
  'browser-chrome', 'browser-edge', 'browser-firefox', 'browser-safari',
  'cone', 'cone-striped', 'cup-straw', 'fire'
];

function humanizeBootstrapIconLabel(iconKey) {
  return String(iconKey || '')
    .trim()
    .replace(/[-_]+/g, ' ')
    .replace(/\b\w/g, function (character) {
      return character.toUpperCase();
    });
}

function loadBootstrapIconCatalog() {
  try {
    const css = fs.readFileSync(BOOTSTRAP_ICON_CSS_PATH, 'utf8');
    const keys = Array.from(new Set((css.match(/\.bi-([a-z0-9-]+)::?before/g) || []).map(function (match) {
      return String(match || '')
        .replace(/^\.bi-/, '')
        .replace(/::?before$/, '')
        .trim()
        .toLowerCase();
    }).filter(Boolean)));

    return keys.map(function (value) {
      return {
        value: value,
        label: humanizeBootstrapIconLabel(value)
      };
    }).sort(function (left, right) {
      return left.value.localeCompare(right.value);
    });
  } catch (_error) {
    return DEFAULT_ANNOUNCEMENT_ICON_KEYS.map(function (value) {
      return { value: value, label: humanizeBootstrapIconLabel(value) };
    });
  }
}

const ANNOUNCEMENT_ICON_CATALOG = loadBootstrapIconCatalog();
const ANNOUNCEMENT_ICON_OPTIONS = DEFAULT_ANNOUNCEMENT_ICON_KEYS.map(function (value) {
  const catalogOption = ANNOUNCEMENT_ICON_CATALOG.find(function (option) {
    return option.value === value;
  });
  return catalogOption || { value: value, label: humanizeBootstrapIconLabel(value) };
});

const ANNOUNCEMENT_ICON_KEYS = DEFAULT_ANNOUNCEMENT_ICON_KEYS.slice();

const ANNOUNCEMENT_ICON_CATALOG_KEYS = ANNOUNCEMENT_ICON_CATALOG.map(function (option) {
  return option.value;
});

const ANNOUNCEMENT_ICON_LABELS = ANNOUNCEMENT_ICON_OPTIONS.reduce(function (labels, option) {
  labels[option.value] = option.label;
  return labels;
}, Object.create(null));

ANNOUNCEMENT_ICON_CATALOG.forEach(function (option) {
  if (!Object.prototype.hasOwnProperty.call(ANNOUNCEMENT_ICON_LABELS, option.value)) {
    ANNOUNCEMENT_ICON_LABELS[option.value] = option.label;
  }
});

const DEFAULT_ANNOUNCEMENT_ICON = 'megaphone-fill';

function normalizeAnnouncementIcon(value) {
  const normalized = String(value || '').trim().toLowerCase();
  return ANNOUNCEMENT_ICON_CATALOG_KEYS.includes(normalized) ? normalized : DEFAULT_ANNOUNCEMENT_ICON;
}

module.exports = {
  DEFAULT_ANNOUNCEMENT_ICON_KEYS,
  ANNOUNCEMENT_ICON_OPTIONS,
  ANNOUNCEMENT_ICON_KEYS,
  ANNOUNCEMENT_ICON_CATALOG,
  ANNOUNCEMENT_ICON_CATALOG_KEYS,
  ANNOUNCEMENT_ICON_LABELS,
  DEFAULT_ANNOUNCEMENT_ICON,
  humanizeBootstrapIconLabel,
  normalizeAnnouncementIcon
};