/**
 * CommCoach Assistant View
 *
 * Wizard flow: Module type → Topic → Persona → KPIs → "Start first session"
 */
import React, { useState } from 'react';
import { useNavigate } from 'react-router-dom';
import { useCurrentInstance } from '../../../hooks/useCurrentInstance';
import * as commcoachApi from '../../../api/commcoachApi';
import { useLanguage } from '../../../providers/language/LanguageContext';
import styles from './Commcoach.module.css';

type WizardStep = 'type' | 'topic' | 'persona' | 'kpis' | 'confirm';

const STEPS: WizardStep[] = ['type', 'topic', 'persona', 'kpis', 'confirm'];

const MODULE_TYPES = [
  { value: 'coaching', label: 'Coaching', icon: '🎯' },
  { value: 'training', label: 'Training', icon: '📚' },
  { value: 'exam', label: 'Prüfung', icon: '✍️' },
  { value: 'elearning', label: 'E-Learning', icon: '💻' },
];

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

  const [step, setStep] = useState<WizardStep>('type');
  const [moduleType, setModuleType] = useState('coaching');
  const [title, setTitle] = useState('');
  const [goals, setGoals] = useState('');
  const [personaId, setPersonaId] = useState<string | null>(null);
  const [_personas, _setPersonas] = useState<any[]>([]);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const stepIdx = STEPS.indexOf(step);

  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 _handleCreate = async () => {
    if (!title.trim()) {
      setError(t('Bitte einen Titel eingeben'));
      return;
    }
    setLoading(true);
    setError(null);
    try {
      const apiRequest = commcoachApi.getApiRequest();
      const module = await commcoachApi.createModuleApi(apiRequest, instanceId, {
        title: title.trim(),
        moduleType,
        goals: goals.trim() || undefined,
        personaId: personaId || undefined,
      });
      navigate(`/mandates/${mandateId}/commcoach/${instanceId}/session?moduleId=${module.id}`);
    } catch (err: any) {
      setError(err?.message || t('Fehler beim Erstellen'));
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className={styles.assistantContainer}>
      <div className={styles.wizardHeader}>
        <h2>{t('Neues Modul erstellen')}</h2>
        <div className={styles.wizardHeaderRight}>
          <div className={styles.stepIndicator}>
            {STEPS.map((s, i) => (
              <div key={s} className={`${styles.stepDot} ${i <= stepIdx ? styles.stepActive : ''}`} />
            ))}
          </div>
          <div className={styles.wizardActions}>
            {stepIdx > 0 && (
              <button className={styles.btnSecondary} onClick={_handleBack}>{t('Zurück')}</button>
            )}
            {step !== 'confirm' ? (
              <button className={styles.btnPrimary} onClick={_handleNext}>{t('Weiter')}</button>
            ) : (
              <button className={styles.btnPrimary} onClick={_handleCreate} disabled={loading}>
                {loading ? t('Erstelle...') : t('Modul erstellen & erste Session starten')}
              </button>
            )}
          </div>
        </div>
      </div>

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

      <div className={styles.wizardContent}>
        {step === 'type' && (
          <div className={styles.wizardStep}>
            <h3>{t('Modul-Typ wählen')}</h3>
            <div className={styles.typeGrid}>
              {MODULE_TYPES.map(mt => (
                <button
                  key={mt.value}
                  className={`${styles.typeCard} ${moduleType === mt.value ? styles.typeCardActive : ''}`}
                  onClick={() => setModuleType(mt.value)}
                >
                  <span className={styles.typeIcon}>{mt.icon}</span>
                  <span>{t(mt.label)}</span>
                </button>
              ))}
            </div>
          </div>
        )}

        {step === 'topic' && (
          <div className={styles.wizardStep}>
            <h3>{t('Thema & Titel')}</h3>
            <input
              type="text"
              className={styles.wizardInput}
              placeholder={t('z.B. Konfliktgespräche, Sales Training...')}
              value={title}
              onChange={e => setTitle(e.target.value)}
              autoFocus
            />
            <textarea
              className={styles.wizardTextarea}
              placeholder={t('Ziele beschreiben (optional)')}
              value={goals}
              onChange={e => setGoals(e.target.value)}
              rows={4}
            />
          </div>
        )}

        {step === 'persona' && (
          <div className={styles.wizardStep}>
            <h3>{t('Persona wählen (optional)')}</h3>
            <p className={styles.wizardHint}>{t('Eine Persona bestimmt den Coaching-Stil. Du kannst dies später ändern.')}</p>
            <button
              className={`${styles.typeCard} ${!personaId ? styles.typeCardActive : ''}`}
              onClick={() => setPersonaId(null)}
            >
              {t('Standard (kein Persona-Override)')}
            </button>
          </div>
        )}

        {step === 'kpis' && (
          <div className={styles.wizardStep}>
            <h3>{t('KPIs (optional)')}</h3>
            <p className={styles.wizardHint}>{t('KPI-Ziele können später in den Modul-Einstellungen definiert werden.')}</p>
          </div>
        )}

        {step === 'confirm' && (
          <div className={styles.wizardStep}>
            <h3>{t('Zusammenfassung')}</h3>
            <div className={styles.confirmSummary}>
              <div><strong>{t('Typ')}:</strong> {MODULE_TYPES.find(m => m.value === moduleType)?.label}</div>
              <div><strong>{t('Titel')}:</strong> {title || t('(kein Titel)')}</div>
              {goals && <div><strong>{t('Ziele')}:</strong> {goals}</div>}
            </div>
          </div>
        )}
      </div>

    </div>
  );
};