import { useTheme } from '@/components/ThemeContext';
import { BottomSheetBackdrop, BottomSheetModal, BottomSheetScrollView } from '@gorhom/bottom-sheet';
import { useMutation, useQuery } from '@tanstack/react-query';
import { AxiosError } from 'axios';
import { router, useFocusEffect } from 'expo-router';
import React, { useCallback, useRef, useState } from 'react';
import {
  Alert,
  Image,
  KeyboardAvoidingView,
  Linking,
  ScrollView,
  StyleSheet,
  Text,
  TouchableOpacity,
  View,
} from 'react-native';

import PAYME from '@/assets/images/Payme_NEW.png';
import { useTranslation } from 'react-i18next';
import { price_calculation } from '../lib/api';
import { CreateAdsResponse } from '../lib/types';
import StepFour from './StepFour';
import StepOne from './StepOne';
import StepThree from './StepThree';
import StepTwo from './StepTwo';

type MediaFile = {
  uri: string;
  type: string;
  name: string;
};

interface formDataType {
  title: string;
  description: string;
  phone: string;
  media: MediaFile[];
  category: any[];
  country: string;
  region: string;
  district: string;
  company: any[];
}

const getMimeType = (uri: string) => {
  const ext = uri.split('.').pop()?.toLowerCase();
  switch (ext) {
    case 'jpg':
    case 'jpeg':
      return 'image/jpeg';
    case 'png':
      return 'image/png';
    case 'webp':
      return 'image/webp';
    case 'heic':
      return 'image/heic';
    default:
      return 'application/octet-stream';
  }
};

export default function CreateAdsScreens() {
  const { isDark } = useTheme();
  const { t } = useTranslation();
  const [paymentType, setPaymentType] = useState<'PAYME' | 'REFFERAL'>('PAYME');
  const [ads, setAds] = useState<CreateAdsResponse | null>(null);
  const [currentStep, setCurrentStep] = useState(1);

  const stepOneRef = useRef<{ validate: () => boolean } | null>(null);
  const stepTwoRef = useRef<{ validate: () => boolean } | null>(null);
  const stepThreeRef = useRef<{ validate: () => boolean } | null>(null);

  const bottomSheetModalRef = useRef<BottomSheetModal>(null);
  const renderBackdrop = useCallback(
    (props: any) => (
      <BottomSheetBackdrop {...props} disappearsOnIndex={-1} appearsOnIndex={0} opacity={0.5} />
    ),
    []
  );

  const [formData, setFormData] = useState<formDataType>({
    title: '',
    description: '',
    phone: '',
    media: [],
    category: [],
    country: '',
    region: '',
    district: 'all',
    company: [],
  });

  useFocusEffect(
    useCallback(() => {
      return () => {
        setFormData({
          title: '',
          description: '',
          phone: '',
          media: [],
          category: [],
          country: '',
          region: '',
          district: 'all',
          company: [],
        });
        setCurrentStep(1);
      };
    }, [])
  );

  const { data } = useQuery({
    queryKey: ['price-calculation', formData],
    queryFn: () =>
      price_calculation.calculation({
        country: formData.country,
        district: formData.district,
        region: formData.region,
        types: formData.category.map((c: any) => c.id).join(','),
        letters: formData.company.map((c: any) => c.latter).join(','),
      }),
    enabled: formData.company.length > 0,
  });

  const updateForm = (key: string, value: any) => setFormData((p) => ({ ...p, [key]: value }));

  const { mutate, isPending } = useMutation({
    mutationFn: (body: FormData) => price_calculation.ad(body),
    onSuccess: (res) => {
      setAds(res.data);
      setCurrentStep(4);
    },
    onError: (err: AxiosError) => {
      Alert.alert('Xatolik', err.message);
    },
  });

  const handleSubmit = () => {
    const form = new FormData();

    form.append('title', formData.title);
    form.append('description', formData.description);

    formData.media.forEach((file, index) => {
      form.append(`files[${index}]`, {
        uri: file.uri,
        type: getMimeType(file.uri),
        name: file.uri.split('/').pop(),
      } as any);
    });

    formData.category.forEach((e, index) => {
      form.append(`types[${index}]`, e.id);
    });

    if (data) {
      form.append('total_price', data.data.total_price.toString());
    }

    form.append('phone_number', `998${formData.phone}`);

    const letters = formData.company.map((c: any) => c.latter).join(',');

    form.append('company_selections[0]continent', 'Asia');
    form.append('company_selections[0]country', formData.country);
    form.append('company_selections[0]region', formData.region);
    form.append('company_selections[0]district', formData.district);
    form.append('company_selections[0]letters', letters);
    form.append('company_selections[0]total_companies', data?.data.user_count.toString() || '0');
    form.append('company_selections[0]ad_price', data?.data.one_person_price.toString() || '0');
    form.append('company_selections[0]total_price', data?.data.total_price.toString() || '0');

    mutate(form);
  };

  const handlePresentModalPress = useCallback(() => {
    bottomSheetModalRef.current?.present();
  }, []);

  const { mutate: payment } = useMutation({
    mutationFn: (body: { return_url: string; adId: number; paymentType: 'payme' | 'referral' }) =>
      price_calculation.payment(body),
    onSuccess: async (res, variables) => {
      if (variables.paymentType === 'payme') {
        await Linking.openURL(res.data.url);
        router.push('/(dashboard)/announcements');
      } else {
        router.push('/(dashboard)/announcements');
      }
    },
    onError: (err) => {
      Alert.alert('Xatolik yuz berdi', err.message);
    },
  });

  const sendPayment = (type: 'payme' | 'referral') => {
    if (ads) {
      payment({
        adId: ads.data.id,
        paymentType: type,
        return_url: 'https://infotarget.uz/en/main/dashboard',
      });
    }
  };

  return (
    <KeyboardAvoidingView
      behavior="padding"
      style={[styles.safeArea, isDark ? styles.darkBg : styles.lightBg]}
    >
      <ScrollView contentContainerStyle={styles.container}>
        <Text style={[styles.title, isDark ? styles.darkText : styles.lightText]}>
          {currentStep === 1
            ? t("E'lon ma'lumotlari")
            : currentStep === 2
              ? t('Sohalar')
              : currentStep === 3
                ? t('Manzil')
                : t("To'lov")}
        </Text>

        {currentStep === 1 && (
          <StepOne ref={stepOneRef} formData={formData} updateForm={updateForm} />
        )}
        {currentStep === 2 && (
          <StepTwo ref={stepTwoRef} formData={formData} updateForm={updateForm} />
        )}
        {currentStep === 3 && (
          <StepThree
            ref={stepThreeRef}
            formData={formData}
            updateForm={updateForm}
            data={data?.data}
          />
        )}
        {currentStep === 4 && <StepFour data={ads} setPayment={setPaymentType} />}
      </ScrollView>

      {/* FOOTER */}
      <View style={styles.footer}>
        {currentStep > 1 && currentStep !== 4 && (
          <TouchableOpacity
            style={[styles.back, isDark ? styles.darkBack : styles.lightBack]}
            onPress={() => setCurrentStep((s) => s - 1)}
          >
            <Text style={[styles.btnText, isDark ? styles.darkBtnText : styles.lightBtnText]}>
              {t('Orqaga')}
            </Text>
          </TouchableOpacity>
        )}

        <TouchableOpacity
          style={styles.next}
          disabled={isPending}
          onPress={() => {
            let isValid = true;

            if (currentStep === 1) isValid = stepOneRef.current?.validate() ?? false;
            if (currentStep === 2) isValid = stepTwoRef.current?.validate() ?? false;
            if (currentStep === 3) isValid = stepThreeRef.current?.validate() ?? false;

            if (!isValid) return;

            if (currentStep < 3) setCurrentStep((s) => s + 1);
            if (currentStep === 3) handleSubmit();
            if (currentStep === 4) handlePresentModalPress();
          }}
        >
          <Text style={styles.btnText}>
            {currentStep === 3 ? t('Yaratish') : currentStep === 4 ? t("To'lash") : t('Keyingisi')}
          </Text>
        </TouchableOpacity>
      </View>

      {/* PAYMENT BOTTOM SHEET */}
      <BottomSheetModal
        ref={bottomSheetModalRef}
        index={0}
        snapPoints={['70%', '95%']}
        backdropComponent={renderBackdrop}
        handleIndicatorStyle={{ backgroundColor: '#94a3b8', width: 50 }}
        backgroundStyle={{ backgroundColor: isDark ? '#0f172a' : '#ffffff' }}
        enablePanDownToClose
      >
        <BottomSheetScrollView
          style={styles.sheetContent}
          contentContainerStyle={styles.sheetContentContainer}
        >
          <View style={{ padding: 20 }}>
            <Text style={[styles.sheetTitle, isDark ? styles.darkText : styles.lightText]}>
              {t("To'lov turini tanlang")}
            </Text>

            <TouchableOpacity
              style={[
                styles.paymentItem,
                isDark ? styles.darkPaymentItem : styles.lightPaymentItem,
                { flexDirection: 'row', justifyContent: 'flex-start', alignItems: 'center' },
              ]}
              onPress={() => sendPayment('payme')}
            >
              <Image source={PAYME} style={{ width: 80, height: 80 }} />
            </TouchableOpacity>

            <TouchableOpacity
              style={[
                styles.paymentItem,
                isDark ? styles.darkPaymentItem : styles.lightPaymentItem,
              ]}
              onPress={() => sendPayment('referral')}
            >
              <Text style={[styles.paymentText, isDark ? styles.darkText : styles.lightText]}>
                {t('Referal orqali')}
              </Text>
            </TouchableOpacity>
          </View>
        </BottomSheetScrollView>
      </BottomSheetModal>
    </KeyboardAvoidingView>
  );
}

const styles = StyleSheet.create({
  safeArea: { flex: 1 },
  darkBg: {
    backgroundColor: '#0f172a',
  },
  lightBg: {
    backgroundColor: '#f8fafc',
  },
  container: { padding: 20, paddingBottom: 140 },
  title: { fontSize: 22, fontWeight: '800', marginBottom: 20 },
  darkText: {
    color: '#f1f5f9',
  },
  lightText: {
    color: '#0f172a',
  },

  footer: {
    position: 'absolute',
    bottom: 80,
    left: 20,
    right: 20,
    flexDirection: 'row',
    gap: 10,
  },
  back: {
    flex: 1,
    height: 56,
    borderRadius: 16,
    justifyContent: 'center',
    alignItems: 'center',
  },
  darkBack: {
    backgroundColor: '#1e293b',
  },
  lightBack: {
    backgroundColor: '#ffffff',
    borderWidth: 1,
    borderColor: '#e2e8f0',
  },
  sheetContent: { flex: 1 },
  sheetContentContainer: { paddingBottom: 40 },
  next: {
    flex: 2,
    height: 56,
    backgroundColor: '#3b82f6',
    borderRadius: 16,
    justifyContent: 'center',
    alignItems: 'center',
  },
  btnText: { color: '#ffffff', fontWeight: '700', fontSize: 16 },
  darkBtnText: {
    color: '#f1f5f9',
  },
  lightBtnText: {
    color: '#0f172a',
  },

  sheetTitle: {
    fontSize: 18,
    fontWeight: '700',
    marginBottom: 16,
  },
  paymentItem: {
    height: 56,
    borderRadius: 14,
    justifyContent: 'center',
    paddingHorizontal: 16,
    marginBottom: 12,
  },
  darkPaymentItem: {
    backgroundColor: '#1e293b',
  },
  lightPaymentItem: {
    backgroundColor: '#f8fafc',
  },
  paymentText: {
    fontSize: 16,
    fontWeight: '600',
  },
});
