import React, { useEffect, useState } from 'react';
import { View, Text, StyleSheet, ActivityIndicator } from 'react-native';
import { useLocalSearchParams, useRouter } from 'expo-router';
import { Ionicons } from '@expo/vector-icons';
import { Screen } from '@presentation/components/layout/Screen';
import { Button } from '@presentation/components/ui/Button';
import { colors, typography, spacing, radius } from '@shared/theme';
import { verifyEmailUseCase } from '@infrastructure/container';

type Status = 'loading' | 'success' | 'error';

/**
 * Handler de deep link: meowspool://verify-email?token=xxx
 * Chama o backend para confirmar o e-mail e exibe o resultado.
 */
export default function VerifyEmailDeepLink(): React.ReactElement {
  const { token } = useLocalSearchParams<{ token: string }>();
  const router = useRouter();
  const [status, setStatus] = useState<Status>('loading');
  const [errorMessage, setErrorMessage] = useState('Não foi possível verificar o e-mail.');

  useEffect(() => {
    if (!token) {
      setErrorMessage('Link inválido ou expirado.');
      setStatus('error');
      return;
    }

    verifyEmailUseCase.execute(token)
      .then(() => setStatus('success'))
      .catch((e: unknown) => {
        const msg = e instanceof Error ? e.message : 'Erro desconhecido.';
        setErrorMessage(msg);
        setStatus('error');
      });
  }, [token]);

  return (
    <Screen>
      <View style={styles.content}>
        {status === 'loading' && (
          <>
            <ActivityIndicator size="large" color={colors.accent} />
            <Text style={styles.message}>Verificando e-mail…</Text>
          </>
        )}

        {status === 'success' && (
          <>
            <View style={[styles.iconWrapper, styles.iconSuccess]}>
              <Ionicons name="checkmark-circle-outline" size={64} color={colors.accent} />
            </View>
            <Text style={styles.title}>E-mail verificado!</Text>
            <Text style={styles.message}>Sua conta está ativa. Faça login para continuar.</Text>
            <Button
              label="Ir para o login"
              onPress={() => router.replace('/(auth)/login')}
              style={styles.cta}
            />
          </>
        )}

        {status === 'error' && (
          <>
            <View style={[styles.iconWrapper, styles.iconError]}>
              <Ionicons name="close-circle-outline" size={64} color={colors.error ?? '#FF6B6B'} />
            </View>
            <Text style={styles.title}>Falha na verificação</Text>
            <Text style={styles.message}>{errorMessage}</Text>
            <Button
              label="Voltar ao login"
              onPress={() => router.replace('/(auth)/login')}
              style={styles.cta}
            />
          </>
        )}
      </View>
    </Screen>
  );
}

const styles = StyleSheet.create({
  content: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    gap: spacing[4],
    paddingHorizontal: spacing[6],
  },
  iconWrapper: {
    width: 100,
    height: 100,
    borderRadius: radius.xl,
    backgroundColor: colors.bgSurface,
    alignItems: 'center',
    justifyContent: 'center',
    marginBottom: spacing[2],
  },
  iconSuccess: {},
  iconError: {},
  title: {
    fontFamily: typography.fontFamily.ui,
    fontSize: typography.fontSize.xl,
    fontWeight: typography.fontWeight.bold,
    color: colors.textPrimary,
    textAlign: 'center',
  },
  message: {
    fontFamily: typography.fontFamily.ui,
    fontSize: typography.fontSize.base,
    color: colors.textSecondary,
    textAlign: 'center',
    lineHeight: typography.fontSize.base * 1.6,
  },
  cta: { marginTop: spacing[2], width: '100%' },
});