import { useState } from 'react';
import {
  View,
  StyleSheet,
  ScrollView,
  KeyboardAvoidingView,
} from 'react-native';

import { Text } from '@/components/ui/Text';
import { router } from 'expo-router';
import { StatusBar } from 'expo-status-bar';
import { SafeAreaView } from 'react-native-safe-area-context';
import { useThemeColor } from '@/hooks/use-theme-color';
import { Button, Input } from '@/components/ui';
import { useAuth } from '@/context/AuthContext';
import { apiClient, ApiError, User } from '@/lib/api'
import { useToast } from '@/context/ToastContext';
import { translateError, translateFields } from '@/lib/errors/translations';
import { Card } from '@/components/ui/Cards';
import AvatarUpload  from '@/components/ui/AvatarUpload';
import { Typography, Spacing, Colors } from '@/constants/theme';

export default function Profile() {
  const { user, updateAuthUser } = useAuth();
  const { showToast } = useToast();
  const [firstName, setFirstName] = useState(user?.firstName ?? '');
  const [lastName, setLastName] = useState(user?.lastName ?? '');
  const [email, setEmail] = useState(user?.email ?? '');
  const [password, setPassword] = useState('');
  const [confirmPassword, setConfirmPassword] = useState('');
  const [loading] = useState(false);
  const [errors, setErrors] = useState<{
    firstName?: string;
    lastName?: string;
    email?: string;
    password?: string;
    confirmPassword?: string;
  }>({});

  const backgroundColor = useThemeColor({}, 'background');

  const validateForm = () => {
    const newErrors: {
      firstName?: string;
      email?: string;
      password?: string;
      confirmPassword?: string
    } = {};

    if (password) {
      if (!confirmPassword) {
        newErrors.confirmPassword = 'Precisa confirmar a senha';
      } else {
        if (password !== confirmPassword) {
          newErrors.confirmPassword = "Senhas não conferem";
        }
      }
    }

    if (!/\S+@\S+\.\S+/.test(email)) {
      newErrors.email = 'Por favor, use um email válido';
    }

    if (!firstName) {
      newErrors.firstName = 'É necessário ter um nome';
    }

    setErrors(newErrors);

    return Object.keys(newErrors).length === 0;
  }

  const handleUpdate = async () => {
    if (!user) return;
    if (!validateForm()) return;

    try {
      const id = user.id;

      const response = await apiClient.updateUser({
        id,
        firstName,
        lastName,
        email,
        ...(password ? { password } : {}),
      });

      updateAuthUser(response.user);

      router.replace('/(tabs)/insights');
    } catch (error) {
      console.error("[PROFILE]", error)
      if (error instanceof ApiError && error.fields) {
        setErrors(translateFields(error.fields));
      } else {
        showToast(translateError(error) || 'Falha ao atualizar o perfil', 'error');
      }
    }
  }

  const onChangeAvatar = (user: User) => {
    updateAuthUser(user);
  }

  return (
    <SafeAreaView style={[styles.container, { backgroundColor }]}>
      <StatusBar style={'dark'} />
      <KeyboardAvoidingView
        behavior='height'
        style={styles.keyboardView}
      >
        <ScrollView
          contentContainerStyle={styles.scrollContainer}
          showsVerticalScrollIndicator={false}
        >
          <AvatarUpload
            currentAvatar={user?.avatarURL}
            onUploadSuccess={onChangeAvatar}
            onRemoveSuccess={onChangeAvatar} />

          <View style={styles.form}>
            <Card style={styles.cardBlock}>
              <Input
                label="Primeiro Nome"
                type="text"
                value={firstName}
                onChangeText={setFirstName}
                placeholder="Qual seu nome?"
                variant="darkGhost"
                error={errors.firstName}
              />

              <Input
                label="Sobrenome"
                type="text"
                value={lastName}
                variant="darkGhost"
                onChangeText={setLastName}
                placeholder="Qual seu sobrenome?"
                error={errors.lastName}
              />
            </Card>

            <Card style={styles.cardBlock}>
              <Input
                label="Email"
                type="text"
                value={email}
                variant="darkGhost"
                onChangeText={setEmail}
                placeholder="Qual seu email?"
                error={errors.email}
              />
            </Card>

            <Card style={styles.cardBlock}>
              <Input
                label="Nova senha"
                type="password"
                value={password}
                onChangeText={setPassword}
                placeholder="Digite uma nova senha"
                error={errors.password}
                variant="darkGhost"
                showPasswordToggle
              />

              <Input
                label="Confirmar nova senha"
                type="password"
                value={confirmPassword}
                onChangeText={setConfirmPassword}
                placeholder="Confirme a nova senha"
                error={errors.confirmPassword}
                variant="darkGhost"
                showPasswordToggle
              />

              <Text style={styles.cardBlockHint}>
                Preencha apenas se quiser mudar a sua senha
              </Text>
            </Card>

            <Button
              title="Atualizar perfil"
              onPress={handleUpdate}
              loading={loading}
              style={styles.resetButton}
            />
          </View>

        </ScrollView>
      </KeyboardAvoidingView>
    </SafeAreaView>
  )
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
  },
  keyboardView: {
    flex: 1,
  },
  scrollContainer: {
    flexGrow: 1,
    paddingHorizontal: 24,
    justifyContent: 'flex-start',
    minHeight: '100%',
  },
  header: {
    alignItems: 'flex-start',
    marginBottom: 40,
  },
  title: {
    fontSize: 28,
    fontWeight: 'bold',
    marginBottom: 8,
  },
  subtitle: {
    fontSize: 16,
    textAlign: 'left',
  },
  form: {
    marginBottom: 32,
  },
  resetButton: {
    marginTop: 8,
  },
  link: {
    textAlign: 'center',
    fontSize: 14,
    fontWeight: '500',
  },
  footer: {
    flexDirection: 'row',
    justifyContent: 'center',
    alignItems: 'center',
    marginTop: 'auto',
    paddingBottom: 20,
  },
  footerText: {
    fontSize: 14,
  },
  cardBlock: {
    padding: Spacing.cardGap
  },
  cardBlockHint: {
    ...Typography.cardHint,
    color: Colors.light.textSecondary
  }
});