(function () {
  'use strict';

  const NOTIFICATION_PRESETS = ['15m', '30m', '1h', '2h', '4h', '8h', '1d'];

  const NOTIFICATION_TAB_KEYS = {
    surge: [
      'surge_tickets',
      'surge_game',
      'surge_stale',
      'surge_needs_response',
      'surge_unclaimed',
      'surge_tier3_unclaimed',
      'surge_no_staff'
    ],
    patterns: [
      'user_tickets',
      'user_reopen',
      'user_crossgame',
      'game_surge',
      'game_backlog',
      'game_resolution',
      'game_spike',
      'tag_top',
      'tag_escalation',
      'untagged_closes',
      'tag_game_corr',
      'user_esc',
      'game_esc_rate',
      'rapid_t2_t3',
      'staff_no_close',
      'staff_overloaded',
      'staff_stale',
      'staff_transfer_rate',
      'staff_esc',
      'staff_game_esc',
      'game_tag_spike',
      'overnight_gap',
      'staff_always_esc'
    ],
    unclaimed: ['unclaimed_reminder'],
    chat: ['chat_messages', 'chat_time']
  };

  const NOTIFICATION_ALERT_DESCRIPTIONS = {
    surge_tickets: 'Fires when total active ticket volume exceeds configured surge thresholds, signaling broad queue pressure that needs staffing attention.',
    surge_game: 'Fires when one game accumulates tickets unusually fast within the configured window, indicating a localized incident that should be triaged.',
    surge_stale: 'Fires when too many tickets stay unresolved past the stale-time threshold, prompting staff to clear aging backlog.',
    surge_needs_response: 'Fires when tickets needing a staff reply exceed count and age limits, indicating response latency is building.',
    surge_unclaimed: 'Fires when the unclaimed queue crosses configured count/age thresholds, signaling ownership gaps that need pickup.',
    surge_tier3_unclaimed: "Fires when Tier 3 tickets have been sitting unclaimed past each threshold. Escalating intervals prevent spam while ensuring critical tickets don't go unnoticed.",
    surge_no_staff: 'Fires when open-ticket load is high while no staff are detected as available, prompting immediate coverage.',
    user_tickets: 'Detects users opening unusually high ticket counts in the active window, suggesting repeat-issue or abuse patterns.',
    user_reopen: 'Detects users who repeatedly reopen or recreate issues after closure, signaling unresolved root-cause patterns.',
    user_crossgame: 'Detects users reporting similar issues across multiple games in a short period, indicating broader account-level impact.',
    game_surge: 'Detects game-specific ticket spikes crossing thresholds in the pattern window, signaling service instability for that title.',
    game_backlog: 'Detects games accumulating unresolved backlog above threshold, implying triage capacity is lagging for that queue.',
    game_resolution: 'Detects unusual drops in resolution rate for a game, indicating tickets are staying open longer than expected.',
    game_spike: 'Detects abrupt short-window jumps in ticket volume for a game, flagging incidents that may need escalation.',
    tag_top: 'Detects tag frequency leaders above threshold so recurring issue types can be prioritized for fixes or macros.',
    tag_escalation: 'Detects tags with unusually high escalation rates, indicating categories that routinely require higher-tier handling.',
    untagged_closes: 'Detects elevated counts of closed tickets without tags, prompting cleanup to preserve reporting quality.',
    tag_game_corr: 'Detects strong tag-to-game concentration patterns, highlighting issue types tightly linked to specific games.',
    user_esc: 'Detects users whose tickets escalate unusually often, implying complex cases that may need proactive follow-up.',
    game_esc_rate: 'Detects games with escalating ticket-rate thresholds exceeded, signaling deeper technical issues for that title.',
    rapid_t2_t3: 'Fires at ticket count milestones (e.g. 3, 5, 10) when tickets have reached Tier 3 this week. Each milestone fires once per week.',
    staff_no_close: 'Detects staff with prolonged periods of claims but few closes, suggesting overloaded ownership or stuck work.',
    staff_overloaded: 'Detects staff carrying ticket loads beyond threshold, indicating balancing or reassignment may be needed.',
    staff_stale: 'Detects staff-owned tickets aging beyond stale limits, prompting review and unblock actions.',
    staff_transfer_rate: 'Detects unusually high transfer/reassignment rates by staff, signaling ownership churn that may hurt throughput.',
    staff_esc: 'Detects staff escalation counts above threshold, highlighting where extra support or training may be needed.',
    staff_game_esc: 'Detects high escalation concentration for specific staff/game combinations, indicating targeted expertise gaps.',
    game_tag_spike: 'Detects sudden spikes of specific tags within a game, flagging focused incident signatures.',
    overnight_gap: 'Detects recurring unattended overnight windows with active demand, suggesting staffing coverage gaps.',
    staff_always_esc: 'Detects staff whose handled tickets escalate at consistently high rates, implying sustained tier-fit issues.',
    unclaimed_reminder: 'Reminds all staff notification channels about unclaimed tickets. Thresholds are per-ticket age — each threshold fires once per ticket and resets on escalation.',
    chat_messages: 'Fires when pending user message volume in monitored chat channels crosses configured count thresholds without staff replies.',
    chat_time: 'Fires when a monitored chat channel has had no staff response for the given duration with pending user messages. Resets when staff responds.'
  };

  let notificationThresholdsState = {};

  function initNotificationsEditor(config) {
    const section = document.getElementById('s-notifications');
    if (!section) return;

    const hiddenField = section.querySelector('[data-key="NOTIFICATION_THRESHOLDS_JSON"]');
    if (!hiddenField) return;

    notificationThresholdsState = parseNotificationThresholdsConfig(config);
    hiddenField.value = serializeNotificationThresholds(notificationThresholdsState);

    section.querySelectorAll('.notif-tab-btn').forEach(btn => {
      btn.addEventListener('click', () => setNotificationTab(btn.dataset.notifTab));
    });

    Object.entries(NOTIFICATION_TAB_KEYS).forEach(([category, keys]) => {
      const select = section.querySelector(`[data-notif-category="${category}"]`);
      const chipsWrap = section.querySelector(`[data-notif-chips="${category}"]`);
      const input = section.querySelector(`[data-notif-input="${category}"]`);
      const addBtn = section.querySelector(`[data-notif-add="${category}"]`);
      const presetsWrap = section.querySelector(`[data-notif-presets="${category}"]`);
      if (!select || !chipsWrap || !input || !addBtn || !presetsWrap) return;

      keys.forEach(key => {
        const option = document.createElement('option');
        option.value = key;
        option.textContent = toHumanLabel(key);
        select.appendChild(option);
      });

      if (keys.length) select.value = keys[0];

      select.addEventListener('change', () => {
        renderThresholdChips(category);
        renderAlertDescription(category);
      });
      addBtn.addEventListener('click', () => addThresholdFromInput(category));
      input.addEventListener('keydown', (evt) => {
        if (evt.key === 'Enter') {
          evt.preventDefault();
          addThresholdFromInput(category);
        }
      });

      NOTIFICATION_PRESETS.forEach(preset => {
        const btn = document.createElement('button');
        btn.type = 'button';
        btn.textContent = preset;
        btn.addEventListener('click', () => addThresholdValue(category, preset));
        presetsWrap.appendChild(btn);
      });

      renderThresholdChips(category);
      renderAlertDescription(category);
    });

    setNotificationTab('surge');
  }

  function parseNotificationThresholdsConfig(config) {
    const rawJson = config.NOTIFICATION_THRESHOLDS_JSON;
    if (rawJson && String(rawJson).trim()) {
      try {
        const parsed = JSON.parse(rawJson);
        if (parsed && typeof parsed === 'object' && !Array.isArray(parsed)) return parsed;
      } catch (_) {}
    }
    if (config.NOTIFICATION_THRESHOLDS && typeof config.NOTIFICATION_THRESHOLDS === 'object' && !Array.isArray(config.NOTIFICATION_THRESHOLDS)) {
      return config.NOTIFICATION_THRESHOLDS;
    }
    return {};
  }

  function serializeNotificationThresholds(obj) {
    const ordered = {};
    Object.keys(obj).sort().forEach(key => {
      const arr = Array.isArray(obj[key]) ? obj[key].map(v => String(v).trim()).filter(Boolean) : [];
      ordered[key] = arr;
    });
    return JSON.stringify(ordered);
  }

  function setNotificationTab(category) {
    document.querySelectorAll('#s-notifications .notif-tab-btn').forEach(btn => {
      btn.classList.toggle('active', btn.dataset.notifTab === category);
    });
    document.querySelectorAll('#s-notifications .notif-panel').forEach(panel => {
      panel.classList.toggle('hidden', panel.dataset.notifPanel !== category);
    });
  }

  function addThresholdFromInput(category) {
    const input = document.querySelector(`#s-notifications [data-notif-input="${category}"]`);
    if (!input) return;
    const value = input.value.trim().toLowerCase();
    if (addThresholdValue(category, value)) input.value = '';
  }

  function addThresholdValue(category, rawValue) {
    const value = String(rawValue || '').trim().toLowerCase();
    if (!isValidThresholdValue(value)) {
      Util.showToast('Invalid threshold format. Use 15m, 1h, 1d6h, or whole numbers.', 'error');
      return false;
    }

    const alertKey = getSelectedAlertKey(category);
    if (!alertKey) return false;

    const current = Array.isArray(notificationThresholdsState[alertKey]) ? [...notificationThresholdsState[alertKey]] : [];
    if (current.includes(value)) return false;
    current.push(value);
    notificationThresholdsState[alertKey] = current;
    syncNotificationThresholdsField();
    renderThresholdChips(category);
    return true;
  }

  function removeThresholdValue(category, valueToRemove) {
    const alertKey = getSelectedAlertKey(category);
    if (!alertKey) return;
    const current = Array.isArray(notificationThresholdsState[alertKey]) ? [...notificationThresholdsState[alertKey]] : [];
    notificationThresholdsState[alertKey] = current.filter(v => String(v) !== String(valueToRemove));
    syncNotificationThresholdsField();
    renderThresholdChips(category);
  }

  function renderThresholdChips(category) {
    const chipsWrap = document.querySelector(`#s-notifications [data-notif-chips="${category}"]`);
    if (!chipsWrap) return;
    const alertKey = getSelectedAlertKey(category);
    const thresholds = alertKey && Array.isArray(notificationThresholdsState[alertKey])
      ? notificationThresholdsState[alertKey]
      : [];

    chipsWrap.replaceChildren();
    thresholds.forEach(value => {
      const chip = document.createElement('span');
      chip.className = 'notif-chip';
      chip.textContent = value;

      const remove = document.createElement('button');
      remove.type = 'button';
      remove.title = `Remove ${value}`;
      remove.textContent = '×';
      remove.addEventListener('click', () => removeThresholdValue(category, value));

      chip.appendChild(remove);
      chipsWrap.appendChild(chip);
    });
  }

  function renderAlertDescription(category) {
    const descriptionEl = document.querySelector(`#s-notifications [data-notif-description="${category}"]`);
    if (!descriptionEl) return;
    const alertKey = getSelectedAlertKey(category);
    descriptionEl.textContent = NOTIFICATION_ALERT_DESCRIPTIONS[alertKey] || 'No description available for this alert key yet.';
  }

  function syncNotificationThresholdsField() {
    const hiddenField = document.querySelector('#s-notifications [data-key="NOTIFICATION_THRESHOLDS_JSON"]');
    if (!hiddenField) return;
    const serialized = serializeNotificationThresholds(notificationThresholdsState);
    hiddenField.value = serialized;
    Fields.markChanged('NOTIFICATION_THRESHOLDS_JSON', serialized);
    hiddenField.classList.toggle('changed', Fields.isChanged('NOTIFICATION_THRESHOLDS_JSON'));
  }

  function getSelectedAlertKey(category) {
    const select = document.querySelector(`#s-notifications [data-notif-category="${category}"]`);
    return select ? select.value : '';
  }

  function isValidThresholdValue(value) {
    if (!value) return false;
    if (/^\d+$/.test(value)) return true;
    return /^(\d+[mhd])+$/.test(value);
  }

  function toHumanLabel(key) {
    return String(key)
      .split('_')
      .map(part => part.toUpperCase() === 'T2' || part.toUpperCase() === 'T3'
        ? part.toUpperCase()
        : part.charAt(0).toUpperCase() + part.slice(1))
      .join(' ');
  }

  window.Notifications = {
    initNotificationsEditor,
    isValidThresholdValue,
    toHumanLabel,
    NOTIFICATION_PRESETS,
    NOTIFICATION_TAB_KEYS,
    NOTIFICATION_ALERT_DESCRIPTIONS
  };
})();