/**
 * TeamsBot Assistant View
 *
 * Wizard: Select/create module → Meeting link → Bot selection → "Start bot"
 */
import React, { useState, useEffect, useCallback } from 'react';
import { useNavigate, useSearchParams } 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';

type WizardStep = 'module' | 'meeting' | 'bot' | 'confirm';
const STEPS: WizardStep[] = ['module', 'meeting', 'bot', 'confirm'];

export const TeamsbotAssistantView: React.FC = () => {
  const { t } = useLanguage();
  const { instance, mandateId } = useCurrentInstance();
  const instanceId = instance?.id || '';
  const navigate = useNavigate();
  const [searchParams] = useSearchParams();
  const preselectedModuleId = searchParams.get('moduleId');

  const [step, setStep] = useState<WizardStep>(preselectedModuleId ? 'meeting' : 'module');
  const [modules, setModules] = useState<any[]>([]);
  const [selectedModuleId, setSelectedModuleId] = useState<string | null>(preselectedModuleId);
  const [newModuleTitle, setNewModuleTitle] = useState('');
  const [createNewModule, setCreateNewModule] = useState(false);
  const [meetingLink, setMeetingLink] = useState('');
  const [botName, setBotName] = useState('AI Assistant');
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const stepIdx = STEPS.indexOf(step);

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

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

  const _handleNext = () => {
    const nextIdx = stepIdx + 1;
    if (nextIdx < STEPS.length) setStep(STEPS[nextIdx]);
  };

  const _handleBack = () => {
    const prevIdx = stepIdx - 1;
    if (prevIdx >= 0) setStep(STEPS[prevIdx]);
  };

  const _handleStart = async () => {
    if (!meetingLink.trim()) {
      setError(t('Meeting-Link erforderlich'));
      return;
    }
    setLoading(true);
    setError(null);
    try {
      let moduleId = selectedModuleId;
      if (createNewModule && newModuleTitle.trim()) {
        const mod = await teamsbotApi.createModule(instanceId, { title: newModuleTitle.trim() });
        moduleId = mod.id;
      }

      const result = await teamsbotApi.startSession(instanceId, {
        meetingLink: meetingLink.trim(),
        botName,
        moduleId: moduleId || undefined,
      } as any);

      navigate(`/mandates/${mandateId}/teamsbot/${instanceId}/sessions?sessionId=${result.session.id}`);
    } catch (err: any) {
      setError(err?.message || t('Fehler beim Starten'));
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className={styles.assistantContainer}>
      <div className={styles.wizardHeader}>
        <h2>{t('Neues Meeting starten')}</h2>
        <div className={styles.stepIndicator}>
          {STEPS.map((s, i) => (
            <div key={s} className={`${styles.stepDot} ${i <= stepIdx ? styles.stepActive : ''}`} />
          ))}
        </div>
      </div>

      {error && <div className={styles.errorBanner}>{error}</div>}

      <div className={styles.wizardContent}>
        {step === 'module' && (
          <div className={styles.wizardStep}>
            <h3>{t('Meeting-Modul wählen')}</h3>
            <div className={styles.moduleChoice}>
              <label>
                <input type="radio" checked={!createNewModule} onChange={() => setCreateNewModule(false)} />
                {t('Bestehendes Modul')}
              </label>
              {!createNewModule && (
                <select
                  value={selectedModuleId || ''}
                  onChange={e => setSelectedModuleId(e.target.value || null)}
                  className={styles.wizardSelect}
                >
                  <option value="">{t('Kein Modul (Adhoc)')}</option>
                  {modules.map(m => (
                    <option key={m.id} value={m.id}>{m.title}</option>
                  ))}
                </select>
              )}
              <label>
                <input type="radio" checked={createNewModule} onChange={() => setCreateNewModule(true)} />
                {t('Neues Modul erstellen')}
              </label>
              {createNewModule && (
                <input
                  type="text"
                  className={styles.wizardInput}
                  placeholder={t('z.B. Weekly Standup, Q3 Review...')}
                  value={newModuleTitle}
                  onChange={e => setNewModuleTitle(e.target.value)}
                />
              )}
            </div>
          </div>
        )}

        {step === 'meeting' && (
          <div className={styles.wizardStep}>
            <h3>{t('Meeting-Link')}</h3>
            <input
              type="text"
              className={styles.wizardInput}
              placeholder="https://teams.microsoft.com/l/meetup-join/..."
              value={meetingLink}
              onChange={e => setMeetingLink(e.target.value)}
              autoFocus
            />
          </div>
        )}

        {step === 'bot' && (
          <div className={styles.wizardStep}>
            <h3>{t('Bot-Name')}</h3>
            <input
              type="text"
              className={styles.wizardInput}
              value={botName}
              onChange={e => setBotName(e.target.value)}
            />
          </div>
        )}

        {step === 'confirm' && (
          <div className={styles.wizardStep}>
            <h3>{t('Zusammenfassung')}</h3>
            <div className={styles.confirmSummary}>
              <div><strong>{t('Modul')}:</strong> {createNewModule ? newModuleTitle : (modules.find(m => m.id === selectedModuleId)?.title || t('Adhoc'))}</div>
              <div><strong>{t('Meeting')}:</strong> {meetingLink}</div>
              <div><strong>{t('Bot')}:</strong> {botName}</div>
            </div>
          </div>
        )}
      </div>

      <div className={styles.wizardActions}>
        {stepIdx > 0 && (
          <button className={styles.btnSecondary} onClick={_handleBack}>{t('Zurück')}</button>
        )}
        <div style={{ flex: 1 }} />
        {step !== 'confirm' ? (
          <button className={styles.btnPrimary} onClick={_handleNext}>{t('Weiter')}</button>
        ) : (
          <button className={styles.btnPrimary} onClick={_handleStart} disabled={loading}>
            {loading ? t('Starte...') : t('Bot starten')}
          </button>
        )}
      </div>
    </div>
  );
};