import React, { useState, useEffect } from 'react';
import { View, StyleSheet, Alert } from 'react-native';
import { useTranslation } from 'react-i18next';
import Text from '~/components/atoms/Text';
import Input from '~/components/atoms/Input';
import Button from '~/components/atoms/Button';
import { useUserSettings } from '../hooks/useUserSettings';
import { useAuth } from '~/features/auth';
import { useTheme } from '~/features/theme/ThemeProvider';

export function ProfileSettings() {
  const { t } = useTranslation();
  const { isDark } = useTheme();
  const { user } = useAuth();
  const { updateUserProfile, loading, error } = useUserSettings();
  
  const [firstName, setFirstName] = useState('');
  const [lastName, setLastName] = useState('');
  const [isUpdating, setIsUpdating] = useState(false);
  const [hasChanges, setHasChanges] = useState(false);

  // Initialize with current user data
  useEffect(() => {
    if (user) {
      setFirstName(user.user_metadata?.first_name || user.first_name || '');
      setLastName(user.user_metadata?.last_name || user.last_name || '');
    }
  }, [user]);

  // Check if there are changes to enable/disable save button
  useEffect(() => {
    const originalFirstName = user?.user_metadata?.first_name || user?.first_name || '';
    const originalLastName = user?.user_metadata?.last_name || user?.last_name || '';
    
    setHasChanges(
      firstName.trim() !== originalFirstName ||
      lastName.trim() !== originalLastName
    );
  }, [firstName, lastName, user]);

  const handleSaveProfile = async () => {
    if (!firstName.trim() && !lastName.trim()) {
      Alert.alert(
        t('settings.error', 'Error'),
        t('settings.profile_empty_error', 'Please enter at least a first or last name.')
      );
      return;
    }

    setIsUpdating(true);
    try {
      await updateUserProfile({
        firstName: firstName.trim() || undefined,
        lastName: lastName.trim() || undefined,
      });
      
      Alert.alert(
        t('settings.profile_updated', 'Profile Updated'),
        t('settings.profile_updated_message', 'Your profile has been updated successfully.')
      );
      
      setHasChanges(false);
    } catch (err) {
      Alert.alert(
        t('settings.error', 'Error'),
        t('settings.profile_error', 'Failed to update profile. Please try again.')
      );
    } finally {
      setIsUpdating(false);
    }
  };

  const styles = StyleSheet.create({
    container: {
      marginBottom: 24,
    },
    title: {
      fontSize: 18,
      fontWeight: '600',
      marginBottom: 16,
      color: isDark ? '#FFFFFF' : '#000000',
    },
    inputContainer: {
      marginBottom: 16,
    },
    inputLabel: {
      fontSize: 14,
      fontWeight: '500',
      marginBottom: 8,
      color: isDark ? 'rgba(255, 255, 255, 0.8)' : 'rgba(0, 0, 0, 0.8)',
    },
    saveButton: {
      marginTop: 8,
    },
    errorText: {
      fontSize: 12,
      color: isDark ? '#FF6B6B' : '#DC3545',
      marginTop: 4,
    },
    currentEmail: {
      fontSize: 14,
      color: isDark ? 'rgba(255, 255, 255, 0.6)' : 'rgba(0, 0, 0, 0.6)',
      marginBottom: 16,
    },
  });

  return (
    <View style={styles.container}>
      <Text style={styles.title}>
        {t('settings.profile_information', 'Profile Information')}
      </Text>
      
      {user?.email && (
        <Text style={styles.currentEmail}>
          {t('settings.email', 'Email')}: {user.email}
        </Text>
      )}
      
      <View style={styles.inputContainer}>
        <Text style={styles.inputLabel}>
          {t('settings.first_name', 'First Name')}
        </Text>
        <Input
          value={firstName}
          onChangeText={setFirstName}
          placeholder={t('settings.first_name_placeholder', 'Enter your first name')}
          autoCapitalize="words"
          autoCorrect={false}
          editable={!isUpdating}
        />
      </View>
      
      <View style={styles.inputContainer}>
        <Text style={styles.inputLabel}>
          {t('settings.last_name', 'Last Name')}
        </Text>
        <Input
          value={lastName}
          onChangeText={setLastName}
          placeholder={t('settings.last_name_placeholder', 'Enter your last name')}
          autoCapitalize="words"
          autoCorrect={false}
          editable={!isUpdating}
        />
      </View>
      
      <Button
        title={t('settings.save_profile', 'Save Profile')}
        onPress={handleSaveProfile}
        disabled={!hasChanges || isUpdating || loading}
        loading={isUpdating}
        variant="primary"
        style={styles.saveButton}
      />
      
      {error && (
        <Text style={styles.errorText}>
          {t('settings.profile_error', 'Failed to update profile')}
        </Text>
      )}
    </View>
  );
}