import { useState } from 'react';
import {
  View,
  Text,
  TextInput,
  TouchableOpacity,
  ActivityIndicator,
} from 'react-native';
import { useRouter } from 'expo-router';
import { SafeAreaView } from 'react-native-safe-area-context';
import { useTranslation } from 'react-i18next';
import { useAuthStore } from '../../stores/auth';
import { KeyboardAwareScreen } from '../../components/KeyboardAwareScreen';

const INPUT_STYLE = {
  fontSize: 16,
  lineHeight: 22,
  paddingVertical: 14,
  paddingHorizontal: 16,
  color: '#0a0a0a',
  fontFamily: 'Nunito_400Regular',
} as const;

export default function NewPasswordScreen() {
  const router = useRouter();
  const { t } = useTranslation();
  const { updatePassword, signOut } = useAuthStore();

  const [password, setPassword] = useState('');
  const [confirm, setConfirm] = useState('');
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [saved, setSaved] = useState(false);

  const onSubmit = async () => {
    if (!password || !confirm) return;
    if (password.length < 8) {
      setError(t('auth.passwordMin8'));
      return;
    }
    if (password !== confirm) {
      setError(t('auth.newPasswordMismatch'));
      return;
    }
    setError(null);
    setLoading(true);
    const res = await updatePassword(password);
    setLoading(false);
    if (res.error) {
      setError(res.error);
      return;
    }
    setSaved(true);
    router.replace('/(app)');
  };

  const onCancel = async () => {
    await signOut();
    router.replace('/(auth)/signin');
  };

  return (
    <SafeAreaView className="flex-1 bg-white">
      <KeyboardAwareScreen contentContainerStyle={{ paddingHorizontal: 24, justifyContent: 'center' }}>
        <Text className="text-3xl text-neutral-900 mb-2" style={{ fontFamily: 'Nunito_700Bold' }}>
          {t('auth.newPasswordTitle')}
        </Text>
        <Text className="text-base text-neutral-500 mb-8 leading-6" style={{ fontFamily: 'Nunito_400Regular' }}>
          {t('auth.newPasswordSubtitle')}
        </Text>

        <TextInput
          className="bg-neutral-100 rounded-xl mb-3"
          style={INPUT_STYLE}
          placeholder={t('auth.newPasswordPlaceholder')}
          placeholderTextColor="#a3a3a3"
          secureTextEntry
          autoComplete="new-password"
          autoCapitalize="none"
          value={password}
          onChangeText={setPassword}
          autoFocus
        />

        <TextInput
          className="bg-neutral-100 rounded-xl mb-3"
          style={INPUT_STYLE}
          placeholder={t('auth.newPasswordConfirmPlaceholder')}
          placeholderTextColor="#a3a3a3"
          secureTextEntry
          autoComplete="new-password"
          autoCapitalize="none"
          value={confirm}
          onChangeText={setConfirm}
        />

        {error && (
          <View className="bg-red-50 border border-red-200 rounded-xl px-4 py-3 mb-3">
            <Text className="text-red-600 text-sm" style={{ fontFamily: 'Nunito_400Regular' }}>{error}</Text>
          </View>
        )}

        {saved && (
          <View className="bg-green-50 border border-green-200 rounded-xl px-4 py-3 mb-3">
            <Text className="text-green-700 text-sm" style={{ fontFamily: 'Nunito_400Regular' }}>{t('auth.newPasswordSaved')}</Text>
          </View>
        )}

        <TouchableOpacity
          onPress={onSubmit}
          disabled={loading || !password || !confirm}
          activeOpacity={0.8}
          className="bg-rebreak-500 rounded-xl items-center mt-1 disabled:opacity-40"
          style={{ paddingVertical: 16 }}
        >
          {loading ? (
            <ActivityIndicator color="white" size="small" />
          ) : (
            <Text className="text-white text-base" style={{ fontFamily: 'Nunito_600SemiBold' }}>{t('auth.newPasswordSave')}</Text>
          )}
        </TouchableOpacity>

        <TouchableOpacity
          onPress={onCancel}
          activeOpacity={0.7}
          className="py-4 items-center mt-2"
        >
          <Text className="text-neutral-500 text-sm" style={{ fontFamily: 'Nunito_400Regular' }}>{t('auth.newPasswordCancelLink')}</Text>
        </TouchableOpacity>
      </KeyboardAwareScreen>
    </SafeAreaView>
  );
}