import { useState, useEffect } from 'react';
import { Link, useNavigate } from 'react-router-dom';
import { useAuth } from '../context/AuthContext.jsx';
import PasswordStrength from '../components/PasswordStrength.jsx';
import AuthBgCol from '../components/AuthBgCol.jsx';
import PasswordInput from '../components/PasswordInput.jsx';

export default function Register() {
  const { register } = useAuth();
  const navigate = useNavigate();
  const [form, setForm] = useState({ email: '', password: '', displayName: '' });
  const [err, setErr] = useState(null);
  const [busy, setBusy] = useState(false);
  const [appInfo, setAppInfo] = useState({ appName: 'Crowdlending Tracker', iconUrl: null, minPasswordLength: 8 });

  useEffect(() => {
    fetch('/api/app-info')
      .then(r => r.json())
      .then(d => setAppInfo(d))
      .catch(() => {});
  }, []);

  const set = (k) => (e) => setForm({ ...form, [k]: e.target.value });

  const [verifyEmail, setVerifyEmail] = useState(null); // email à vérifier

  const submit = async (e) => {
    e.preventDefault();
    setErr(null); setBusy(true);
    try {
      const result = await register(form.email, form.password, form.displayName || undefined);
      if (result?.requiresVerification) {
        setVerifyEmail(result.email);
      } else {
        navigate('/');
      }
    } catch (e) { setErr(e.message); }
    finally { setBusy(false); }
  };

  return (
    <div style={{ display: 'flex', minHeight: '100dvh' }}>

      <AuthBgCol appInfo={appInfo} />


      {/* ── Colonne droite — formulaire ──────────────────────── */}
      <div style={{
        flex: '1 1 50%',
        display: 'flex',
        flexDirection: 'column',
        alignItems: 'center',
        justifyContent: 'center',
        padding: '48px 24px',
        background: 'var(--background, #fff)',
        minWidth: 0,
      }}>

        {/* Logo + nom */}
        <div style={{
          display: 'flex',
          flexDirection: 'column',
          alignItems: 'center',
          gap: 10,
          marginBottom: 32,
        }}>
          {appInfo.iconUrl && (
            <img src={appInfo.iconUrl} alt={appInfo.appName}
                 width={52} height={52} style={{ borderRadius: 12 }} />
          )}
          <span style={{
            fontSize: 20, fontWeight: 700,
            color: 'var(--text)', letterSpacing: '-0.4px',
          }}>
            {appInfo.appName}
          </span>
        </div>

        <div style={{ width: '100%', maxWidth: 360 }}>

          {/* ── Écran vérification email ── */}
          {verifyEmail ? (
            <div style={{ textAlign: 'center' }}>
              <div style={{
                width: 56, height: 56, borderRadius: '50%',
                background: 'var(--primary-bg, #eff6ff)',
                display: 'flex', alignItems: 'center', justifyContent: 'center',
                margin: '0 auto 20px',
              }}>
                <svg width="26" height="26" viewBox="0 0 24 24" fill="none">
                  <path d="M3 8l7.89 5.26a2 2 0 002.22 0L21 8M5 19h14a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v10a2 2 0 002 2z"
                    stroke="var(--primary, #1e40af)" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"/>
                </svg>
              </div>
              <h1 style={{ margin: '0 0 10px', fontSize: 22, fontWeight: 700, color: 'var(--text)' }}>
                Vérifiez votre email
              </h1>
              <p style={{ margin: '0 0 6px', color: 'var(--text-muted)', fontSize: 14, lineHeight: 1.6 }}>
                Un email de vérification a été envoyé à
              </p>
              <p style={{ margin: '0 0 24px', fontWeight: 600, color: 'var(--text)', fontSize: 14 }}>
                {verifyEmail}
              </p>
              <p style={{ margin: '0 0 28px', color: 'var(--text-muted)', fontSize: 13, lineHeight: 1.6 }}>
                Cliquez sur le lien dans l'email pour activer votre compte. Vérifiez aussi vos spams.
              </p>
              <Link to="/login" style={{
                display: 'block', width: '100%', padding: '11px 0',
                background: 'var(--primary, #1e40af)', color: '#fff',
                borderRadius: 8, fontSize: 15, fontWeight: 600,
                textDecoration: 'none', textAlign: 'center',
              }}>
                Retour à la connexion
              </Link>
            </div>
          ) : (
          <>

          {/* En-tête */}
          <div style={{ marginBottom: 28 }}>
            <h1 style={{
              margin: '0 0 6px',
              fontSize: 26, fontWeight: 700,
              letterSpacing: '-0.5px',
              color: 'var(--text)',
            }}>
              Créer un compte
            </h1>
            <p style={{ margin: 0, color: 'var(--text-muted)', fontSize: 14 }}>
              Rejoignez {appInfo.appName}
            </p>
          </div>

          {/* Formulaire */}
          <form onSubmit={submit} style={{ display: 'flex', flexDirection: 'column', gap: 16 }}>

            {err && (
              <div style={{
                padding: '10px 14px', borderRadius: 8, fontSize: 14,
                background: 'var(--danger-bg, #fef2f2)',
                color: 'var(--danger, #dc2626)',
                border: '1px solid var(--danger-light, #fca5a5)',
              }}>
                {err}
              </div>
            )}

            <div style={{ display: 'flex', flexDirection: 'column', gap: 6 }}>
              <label style={{ fontSize: 14, fontWeight: 500, color: 'var(--text)' }}>
                Nom d'affichage
              </label>
              <input
                className="form-input"
                type="text"
                autoComplete="name"
                placeholder="Olivier"
                value={form.displayName}
                onChange={set('displayName')}
                style={{ width: '100%' }}
              />
            </div>

            <div style={{ display: 'flex', flexDirection: 'column', gap: 6 }}>
              <label style={{ fontSize: 14, fontWeight: 500, color: 'var(--text)' }}>
                Adresse email
              </label>
              <input
                className="form-input"
                type="email" required
                autoComplete="email"
                placeholder="vous@exemple.com"
                value={form.email}
                onChange={set('email')}
                style={{ width: '100%' }}
              />
            </div>

            <div style={{ display: 'flex', flexDirection: 'column', gap: 6 }}>
              <label style={{ fontSize: 14, fontWeight: 500, color: 'var(--text)' }}>
                Mot de passe
              </label>
              <PasswordInput
                className="form-input"
                required
                minLength={appInfo.minPasswordLength || 8}
                autoComplete="new-password"
                placeholder="••••••••"
                value={form.password}
                onChange={set('password')}
                style={{ width: '100%' }}
              />
              <PasswordStrength password={form.password} minLength={appInfo.minPasswordLength || 8} />
            </div>

            <button
              type="submit"
              disabled={busy}
              style={{
                marginTop: 4, width: '100%',
                padding: '11px 0',
                background: busy ? 'var(--text-muted)' : 'var(--primary, #1e40af)',
                color: '#fff',
                border: 'none', borderRadius: 8,
                fontSize: 15, fontWeight: 600,
                cursor: busy ? 'not-allowed' : 'pointer',
                transition: 'background 0.15s',
              }}
            >
              {busy ? 'Création…' : 'Créer le compte'}
            </button>

          </form>

          <p style={{
            marginTop: 24, textAlign: 'center',
            fontSize: 13, color: 'var(--text-muted)',
          }}>
            Déjà inscrit ?{' '}
            <Link to="/login" style={{
              color: 'var(--text)', fontWeight: 500, textDecoration: 'underline',
            }}>
              Se connecter
            </Link>
          </p>

          </>)} {/* fin verifyEmail ternaire */}
        </div>
      </div>
    </div>
  );
}
