import React, { useState } from 'react';
import { View, Text, StyleSheet, TouchableOpacity, Alert } from 'react-native';
import { Link, useRouter } from 'expo-router';
import { useForm, Controller } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import { z } from 'zod';
import { Ionicons } from '@expo/vector-icons';
import { Screen } from '@presentation/components/layout/Screen';
import { Header } from '@presentation/components/layout/Header';
import { Input } from '@presentation/components/ui/Input';
import { Button } from '@presentation/components/ui/Button';
import { colors, typography, spacing } from '@shared/theme';
import { registerUseCase } from '@infrastructure/container';

const schema = z.object({
  email: z.string().email('E-mail inválido'),
  password: z
    .string()
    .min(8, 'Mínimo 8 caracteres'),
  confirmPassword: z.string(),
}).refine((d) => d.password === d.confirmPassword, {
  message: 'As senhas não coincidem',
  path: ['confirmPassword'],
});

type FormData = z.infer<typeof schema>;

/**
 * Tela de Cadastro — IX-0
 */
export default function RegisterScreen(): React.ReactElement {
  const router = useRouter();
  const [isLoading, setIsLoading] = useState(false);

  const { control, handleSubmit, formState: { errors } } = useForm<FormData>({
    resolver: zodResolver(schema),
    defaultValues: { email: '', password: '', confirmPassword: '' },
  });

  async function onSubmit(data: FormData): Promise<void> {
    setIsLoading(true);
    try {
      await registerUseCase.execute({ email: data.email, password: data.password });
      router.replace(`/(auth)/check-email?email=${encodeURIComponent(data.email)}`);
    } catch {
      Alert.alert('Erro', 'Não foi possível criar sua conta.');
    } finally {
      setIsLoading(false);
    }
  }

  return (
    <Screen scrollable keyboardAvoiding>
      <Header title="Criar conta" showBack />

      <View style={styles.form}>
        <Controller
          control={control}
          name="email"
          render={({ field }) => (
            <Input
              label="E-MAIL"
              placeholder="seu@email.com"
              keyboardType="email-address"
              autoComplete="email"
              leftIcon={<Ionicons name="mail-outline" size={18} color={colors.textSecondary} />}
              error={errors.email?.message}
              onChangeText={field.onChange}
              value={field.value}
            />
          )}
        />

        <Controller
          control={control}
          name="password"
          render={({ field }) => (
            <Input
              label="SENHA"
              placeholder="Mínimo 8 caracteres"
              isPassword
              leftIcon={<Ionicons name="lock-closed-outline" size={18} color={colors.textSecondary} />}
              error={errors.password?.message}
              onChangeText={field.onChange}
              value={field.value}
            />
          )}
        />

        <Controller
          control={control}
          name="confirmPassword"
          render={({ field }) => (
            <Input
              label="CONFIRMAR SENHA"
              placeholder="Repita a senha"
              isPassword
              leftIcon={<Ionicons name="lock-closed-outline" size={18} color={colors.textSecondary} />}
              error={errors.confirmPassword?.message}
              onChangeText={field.onChange}
              value={field.value}
            />
          )}
        />

        <Button label="Criar conta" onPress={handleSubmit(onSubmit)} isLoading={isLoading} style={styles.cta} />

        <View style={styles.footer}>
          <Text style={styles.footerText}>Já tem uma conta? </Text>
          <Link href="/(auth)/login" asChild>
            <TouchableOpacity>
              <Text style={styles.footerLink}>Entrar</Text>
            </TouchableOpacity>
          </Link>
        </View>
      </View>
    </Screen>
  );
}

const styles = StyleSheet.create({
  form: {
    gap: spacing[4],
    paddingTop: spacing[6],
    paddingBottom: spacing[8],
  },
  cta: {
    marginTop: spacing[2],
  },
  footer: {
    flexDirection: 'row',
    justifyContent: 'center',
    marginTop: spacing[4],
  },
  footerText: {
    fontFamily: typography.fontFamily.ui,
    fontSize: typography.fontSize.sm,
    color: colors.textSecondary,
  },
  footerLink: {
    fontFamily: typography.fontFamily.ui,
    fontSize: typography.fontSize.sm,
    color: colors.accent,
    fontWeight: typography.fontWeight.semibold,
  },
});