/**
 * TeamsBot Modules View
 *
 * CRUD list of MeetingModules with expandable session lists per module.
 */
import React, { useState, useEffect, useCallback } from 'react';
import { useNavigate } from 'react-router-dom';
import { useCurrentInstance } from '../../../hooks/useCurrentInstance';
import * as teamsbotApi from '../../../api/teamsbotApi';
import { useLanguage } from '../../../providers/language/LanguageContext';
import styles from './Teamsbot.module.css';

const SERIES_TYPE_LABELS: Record<string, string> = {
  weekly: 'Wöchentlich',
  biweekly: 'Zweiwöchentlich',
  monthly: 'Monatlich',
  adhoc: 'Adhoc',
  project: 'Projekt',
};

const STATUS_LABELS: Record<string, string> = {
  active: 'Aktiv',
  archived: 'Archiviert',
  completed: 'Abgeschlossen',
};

export const TeamsbotModulesView: React.FC = () => {
  const { t } = useLanguage();
  const { instance, mandateId } = useCurrentInstance();
  const instanceId = instance?.id || '';
  const navigate = useNavigate();

  const [modules, setModules] = useState<any[]>([]);
  const [loading, setLoading] = useState(true);
  const [expandedId, setExpandedId] = useState<string | null>(null);
  const [moduleSessions, setModuleSessions] = useState<Record<string, any[]>>({});
  const [deleteConfirm, setDeleteConfirm] = useState<string | null>(null);
  const [editingModule, setEditingModule] = useState<any | null>(null);

  const _loadModules = useCallback(async () => {
    if (!instanceId) return;
    setLoading(true);
    try {
      const result = await teamsbotApi.listModules(instanceId);
      setModules(result || []);
    } catch (err) {
      console.error('Failed to load modules:', err);
    } finally {
      setLoading(false);
    }
  }, [instanceId]);

  useEffect(() => { _loadModules(); }, [_loadModules]);

  const _loadModuleSessions = useCallback(async (moduleId: string) => {
    if (!instanceId) return;
    try {
      const detail = await teamsbotApi.getModuleDetail(instanceId, moduleId);
      setModuleSessions(prev => ({ ...prev, [moduleId]: detail?.sessions || [] }));
    } catch (err) {
      console.error('Failed to load module sessions:', err);
    }
  }, [instanceId]);

  const _toggleExpand = (moduleId: string) => {
    if (expandedId === moduleId) {
      setExpandedId(null);
    } else {
      setExpandedId(moduleId);
      if (!moduleSessions[moduleId]) _loadModuleSessions(moduleId);
    }
  };

  const _handleDelete = async (moduleId: string) => {
    try {
      await teamsbotApi.deleteModule(instanceId, moduleId);
      setDeleteConfirm(null);
      _loadModules();
    } catch (err) {
      console.error('Delete failed:', err);
    }
  };

  const _handleUpdate = async (moduleId: string, updates: any) => {
    try {
      await teamsbotApi.updateModule(instanceId, moduleId, updates);
      setEditingModule(null);
      _loadModules();
    } catch (err) {
      console.error('Update failed:', err);
    }
  };

  return (
    <div className={styles.modulesContainer}>
      <div className={styles.modulesHeader}>
        <h2>{t('Meeting-Module')}</h2>
        <button
          className={styles.btnPrimary}
          onClick={() => navigate(`/mandates/${mandateId}/teamsbot/${instanceId}/assistant`)}
        >
          {t('Neues Modul')}
        </button>
      </div>

      {loading && <div className={styles.loading}>{t('Laden...')}</div>}

      <div className={styles.modulesList}>
        {modules.map(mod => (
          <div key={mod.id} className={`${styles.moduleCard} ${expandedId === mod.id ? styles.moduleExpanded : ''}`}>
            <div className={styles.moduleRow} onClick={() => _toggleExpand(mod.id)}>
              <span className={styles.moduleType}>{t(SERIES_TYPE_LABELS[mod.seriesType] || mod.seriesType)}</span>
              <span className={styles.moduleTitle}>{mod.title}</span>
              <span className={styles.moduleStatus}>{t(STATUS_LABELS[mod.status] || mod.status)}</span>
              <div className={styles.moduleActions}>
                <button className={styles.btnPrimary} style={{ padding: '0.3rem 0.7rem', fontSize: '0.8rem' }} onClick={e => {
                  e.stopPropagation();
                  navigate(`/mandates/${mandateId}/teamsbot/${instanceId}/assistant?moduleId=${mod.id}`);
                }}>{t('Meeting starten')}</button>
                <button className={styles.btnSmall} onClick={e => { e.stopPropagation(); setEditingModule(mod); }}>{t('Bearbeiten')}</button>
                <button className={styles.btnSmallDanger} onClick={e => { e.stopPropagation(); setDeleteConfirm(mod.id); }}>{t('Löschen')}</button>
              </div>
            </div>

            {expandedId === mod.id && (
              <div className={styles.moduleSessionsList}>
                {(moduleSessions[mod.id] || []).length === 0 ? (
                  <p className={styles.noSessions}>{t('Keine Sitzungen')}</p>
                ) : (
                  (moduleSessions[mod.id] || []).map((sess: any) => (
                    <div
                      key={sess.id}
                      className={styles.sessionRow}
                      onClick={() => navigate(`/mandates/${mandateId}/teamsbot/${instanceId}/sessions?sessionId=${sess.id}`)}
                    >
                      <span>{sess.botName || 'Bot'}</span>
                      <span className={styles.sessionStatus}>{sess.status}</span>
                      <span>{sess.startedAt ? new Date(sess.startedAt * 1000).toLocaleDateString() : '-'}</span>
                    </div>
                  ))
                )}
              </div>
            )}
          </div>
        ))}
      </div>

      {deleteConfirm && (
        <div className={styles.confirmOverlay}>
          <div className={styles.confirmDialog}>
            <p>{t('Modul wirklich löschen? Sessions werden dem Modul entkoppelt.')}</p>
            <div className={styles.confirmActions}>
              <button className={styles.btnSecondary} onClick={() => setDeleteConfirm(null)}>{t('Abbrechen')}</button>
              <button className={styles.btnDanger} onClick={() => _handleDelete(deleteConfirm)}>{t('Löschen')}</button>
            </div>
          </div>
        </div>
      )}

      {editingModule && (
        <div className={styles.confirmOverlay}>
          <div className={styles.editDialog}>
            <h3>{t('Modul bearbeiten')}</h3>
            <input
              type="text"
              defaultValue={editingModule.title}
              className={styles.wizardInput}
              onBlur={e => setEditingModule({ ...editingModule, title: e.target.value })}
            />
            <textarea
              defaultValue={editingModule.goals || ''}
              className={styles.wizardTextarea}
              placeholder={t('Ziele')}
              rows={3}
              onBlur={e => setEditingModule({ ...editingModule, goals: e.target.value })}
            />
            <div className={styles.confirmActions}>
              <button className={styles.btnSecondary} onClick={() => setEditingModule(null)}>{t('Abbrechen')}</button>
              <button className={styles.btnPrimary} onClick={() => _handleUpdate(editingModule.id, {
                title: editingModule.title,
                goals: editingModule.goals,
              })}>{t('Speichern')}</button>
            </div>
          </div>
        </div>
      )}
    </div>
  );
};