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

const COOLDOWN_SECS = 60;

/**
 * Tela de Verificação de E-mail — RU-0
 * Mostrada após o cadastro bem-sucedido.
 */
export default function CheckEmailScreen(): React.ReactElement {
  const { email } = useLocalSearchParams<{ email: string }>();
  const [isLoading, setIsLoading] = useState(false);
  const [cooldown, setCooldown] = useState(0);
  const [sent, setSent] = useState(false);

  useEffect(() => {
    if (cooldown <= 0) return;
    const timer = setTimeout(() => setCooldown((c) => c - 1), 1000);
    return () => clearTimeout(timer);
  }, [cooldown]);

  async function handleResend(): Promise<void> {
    if (!email || cooldown > 0) return;
    setIsLoading(true);
    try {
      await resendVerificationUseCase.execute(email);
      setSent(true);
      setCooldown(COOLDOWN_SECS);
    } finally {
      setIsLoading(false);
    }
  }

  return (
    <Screen>
      <Header title="Verificar e-mail" showBack />

      <View style={styles.content}>
        <View style={styles.iconWrapper}>
          <Ionicons name="mail-outline" size={64} color={colors.accent} />
        </View>

        <Text style={styles.title}>Confirme seu e-mail</Text>
        <Text style={styles.description}>
          Enviamos um link de verificação para o seu e-mail. Clique no link para ativar sua conta e poder fazer login.
        </Text>

        {email && (
          <Button
            label={
              cooldown > 0
                ? `Reenviar em ${cooldown}s`
                : sent
                ? 'Reenviar e-mail'
                : 'Reenviar e-mail'
            }
            variant="secondary"
            onPress={handleResend}
            isLoading={isLoading}
            disabled={cooldown > 0}
            style={styles.resendButton}
          />
        )}

        {sent && cooldown > 0 && (
          <Text style={styles.sentText}>E-mail reenviado! Verifique sua caixa de entrada.</Text>
        )}

        <View style={styles.hint}>
          <Ionicons name="information-circle-outline" size={16} color={colors.textSecondary} />
          <Text style={styles.hintText}>Não recebeu? Verifique sua pasta de spam.</Text>
        </View>
      </View>
    </Screen>
  );
}

const styles = StyleSheet.create({
  content: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    gap: spacing[5],
    paddingHorizontal: spacing[4],
  },
  iconWrapper: {
    width: 100,
    height: 100,
    borderRadius: radius.xl,
    backgroundColor: colors.bgSurface,
    alignItems: 'center',
    justifyContent: 'center',
    marginBottom: spacing[2],
  },
  title: {
    fontFamily: typography.fontFamily.ui,
    fontSize: typography.fontSize.xl,
    fontWeight: typography.fontWeight.bold,
    color: colors.textPrimary,
    textAlign: 'center',
  },
  description: {
    fontFamily: typography.fontFamily.ui,
    fontSize: typography.fontSize.base,
    color: colors.textSecondary,
    textAlign: 'center',
    lineHeight: typography.fontSize.base * 1.6,
  },
  resendButton: {
    width: '100%',
  },
  sentText: {
    fontFamily: typography.fontFamily.ui,
    fontSize: typography.fontSize.sm,
    color: colors.accent,
    textAlign: 'center',
  },
  hint: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: spacing[2],
    marginTop: spacing[2],
  },
  hintText: {
    fontFamily: typography.fontFamily.ui,
    fontSize: typography.fontSize.sm,
    color: colors.textSecondary,
  },
});