import { useTheme } from '@/components/ThemeContext';
import { products_api } from '@/screens/home/lib/api';
import { useQuery } from '@tanstack/react-query';
import React, { forwardRef, useEffect, useImperativeHandle, useState } from 'react';
import { useTranslation } from 'react-i18next';
import {
  Dimensions,
  FlatList,
  ListRenderItemInfo,
  ScrollView,
  StyleSheet,
  Text,
  TouchableOpacity,
  View,
} from 'react-native';
import { PriceCalculationRes } from '../lib/types';
import CategorySelectorBottomSheet from './CategorySelectorBottomSheet';

type StepProps = {
  formData: any;
  data: PriceCalculationRes | undefined;
  updateForm: (key: string, value: any) => void;
};

const SCREEN_WIDTH = Dimensions.get('window').width;
const GAP = 8;
const NUM_COLUMNS = 6;
const ITEM_SIZE = (SCREEN_WIDTH - GAP * (NUM_COLUMNS + 1)) / NUM_COLUMNS;

const StepThree = forwardRef(({ formData, updateForm, data }: StepProps, ref) => {
  const { isDark } = useTheme();
  const { t } = useTranslation();

  const theme = {
    background: isDark ? '#0f172a' : '#ffffff',
    cardBg: isDark ? '#1e293b' : '#f8fafc',
    cardBorder: isDark ? '#334155' : '#e2e8f0',
    text: isDark ? '#f8fafc' : '#0f172a',
    textSecondary: isDark ? '#cbd5e1' : '#64748b',
    primary: '#2563eb',
    error: '#ef4444',
    priceText: isDark ? '#dc2626' : '#ef4444',
    companyBg: isDark ? '#1e293b' : '#f1f5f9',
    companyBorder: isDark ? '#334155' : '#cbd5e1',
  };

  const { data: statesData } = useQuery({
    queryKey: ['country-detail'],
    queryFn: async () => products_api.getStates(),
    select: (res) => res.data.data || [],
  });

  const [showCountry, setShowCountry] = useState(false);
  const [showRegion, setShowRegion] = useState(false);
  const [showDistrict, setShowDistrict] = useState(false);
  const [regions, setRegions] = useState<any[]>([]);
  const [districts, setDistricts] = useState<any[]>([]);
  const [error, setError] = useState<string | null>(null);

  const corporations = Array.from({ length: 26 }).map((_, i) => ({
    id: i + 1,
    latter: String.fromCharCode(65 + i),
  }));

  const onCompanyPress = (item: { id: number; latter: string }) => {
    const selected = formData.company || [];
    const exists = selected.some((c: any) => c.id === item.id);

    if (exists) {
      updateForm(
        'company',
        selected.filter((c: any) => c.id !== item.id)
      );
    } else {
      updateForm('company', [...selected, item]);
    }
  };

  const toggleSelectAllCompanies = () => {
    const selected = formData.company || [];
    if (selected.length === corporations.length) {
      // Deselect all
      updateForm('company', []);
    } else {
      // Select all
      updateForm('company', corporations);
    }
  };

  useEffect(() => {
    const country = statesData?.find((c) => c.code === formData.country);
    setRegions(country?.region || []);
    if (!country?.region.some((r) => r.code === formData.region)) {
      updateForm('region', '');
      updateForm('district', '');
      setDistricts([]);
    }
  }, [formData.country, statesData]);

  useEffect(() => {
    const country = statesData?.find((c) => c.code === formData.country);
    const region = country?.region.find((r) => r.code === formData.region);
    setDistricts(region?.districts || []);

    // If region is 'all', automatically set district to 'all'
    if (formData.region === 'all') {
      updateForm('district', 'all');
    } else if (!region?.districts.some((d) => d.code === formData.district)) {
      updateForm('district', '');
    }
  }, [formData.region, formData.country, statesData]);

  const getLabel = (arr: { name: string; code: string }[], val: string) => {
    if (val === 'all') return t('Hammasi');
    return arr.find((item) => item.code === val)?.name || t('— Tanlang —');
  };

  const renderCompanyItem = ({ item }: ListRenderItemInfo<{ id: number; latter: string }>) => {
    const isSelected = formData.company?.some((c: any) => c.id === item.id);

    return (
      <TouchableOpacity
        style={[
          styles.companyItem,
          {
            backgroundColor: isSelected ? theme.primary : theme.companyBg,
            borderColor: isSelected ? theme.primary : theme.companyBorder,
          },
        ]}
        onPress={() => onCompanyPress(item)}
      >
        <Text
          style={[
            styles.companyText,
            { color: isSelected ? '#fff' : theme.text },
            isSelected && styles.companyTextActive,
          ]}
        >
          {item.latter}
        </Text>
      </TouchableOpacity>
    );
  };

  const validate = () => {
    if (!formData.country) {
      setError('Iltimos, davlat tanlang');
      return false;
    }
    if (!formData.region) {
      setError('Iltimos, viloyat tanlang');
      return false;
    }
    if (!formData.district) {
      setError('Iltimos, tuman/shahar tanlang');
      return false;
    }
    setError(null);
    return true;
  };

  useImperativeHandle(ref, () => ({
    validate,
  }));

  return (
    <ScrollView
      contentContainerStyle={[styles.container, { backgroundColor: theme.background }]}
      showsVerticalScrollIndicator={false}
    >
      {error && <Text style={[styles.error, { color: theme.error }]}>{t(error)}</Text>}

      <Text style={[styles.label, { color: theme.text }]}>{t('Davlat')}</Text>
      <TouchableOpacity
        style={[
          styles.pickerButton,
          {
            backgroundColor: theme.cardBg,
            borderColor: theme.cardBorder,
            flexDirection: 'row',
            alignItems: 'center',
            gap: 10,
          },
        ]}
        onPress={() => setShowCountry(true)}
      >
        <Text style={[styles.pickerText, { color: theme.text }]}>
          {statesData &&
            getLabel(
              statesData.map((c) => ({ name: c.name, code: c.code })),
              formData.country
            )}
        </Text>
      </TouchableOpacity>

      <Text style={[styles.label, { color: theme.text }]}>{t('Viloyat')}</Text>
      <TouchableOpacity
        style={[
          styles.pickerButton,
          { backgroundColor: theme.cardBg, borderColor: theme.cardBorder },
        ]}
        onPress={() => setShowRegion(true)}
      >
        <Text style={[styles.pickerText, { color: theme.text }]}>
          {getLabel(
            regions.map((r) => ({ name: r.name, code: r.code })),
            formData.region
          )}
        </Text>
      </TouchableOpacity>

      <Text style={[styles.label, { color: theme.text }]}>{t('Tuman / Shahar')}</Text>
      <TouchableOpacity
        style={[
          styles.pickerButton,
          {
            backgroundColor: theme.cardBg,
            borderColor: theme.cardBorder,
            opacity: formData.region === 'all' ? 0.5 : 1,
          },
        ]}
        onPress={() => {
          if (formData.region !== 'all') {
            setShowDistrict(true);
          }
        }}
        disabled={formData.region === 'all'}
      >
        <Text style={[styles.pickerText, { color: theme.text }]}>
          {getLabel(
            districts.map((d) => ({ name: d.name, code: d.code })),
            formData.district
          )}
        </Text>
      </TouchableOpacity>

      <View style={{ flexDirection: 'row', justifyContent: 'space-between', alignItems: 'center' }}>
        <Text style={[styles.sectionTitle, { color: theme.text }]}>
          {t('Reklama joylashtirish kompaniyasi')}
        </Text>
        <TouchableOpacity
          style={[
            styles.selectAllButton,
            {
              backgroundColor:
                formData.company?.length === corporations.length ? theme.primary : theme.cardBg,
              borderColor: theme.primary,
            },
          ]}
          onPress={toggleSelectAllCompanies}
        >
          <Text
            style={[
              styles.selectAllText,
              {
                color:
                  formData.company?.length === corporations.length ? '#fff' : theme.primary,
              },
            ]}
          >
            {formData.company?.length === corporations.length ? t('Bekor qilish') : t('Hammasi')}
          </Text>
        </TouchableOpacity>
      </View>
      <FlatList
        data={corporations}
        renderItem={renderCompanyItem}
        keyExtractor={(item) => item.id.toString()}
        numColumns={6}
        columnWrapperStyle={{ gap: 2, marginBottom: GAP, justifyContent: 'flex-start' }}
        scrollEnabled={false}
      />

      <View
        style={[styles.priceCard, { backgroundColor: theme.cardBg, borderColor: theme.cardBorder }]}
      >
        <Text style={[styles.priceLine, { color: theme.text }]}>
          {t('Jami kampaniyalar soni')}: {data ? data.user_count : '0'}
        </Text>
        <Text style={[styles.priceLine, { color: theme.text }]}>
          {t('Reklama narxi')}: {data ? data.one_person_price : '0'}
        </Text>
        <Text style={[styles.totalPrice, { color: theme.priceText }]}>
          {t('Umumiy narx')}: {data ? data.total_price : '0'}
        </Text>
      </View>

      <CategorySelectorBottomSheet
        isOpen={showCountry}
        onClose={() => setShowCountry(false)}
        selectedValue={formData.country}
        data={
          statesData ? statesData.map((c) => ({ label: c.name, value: c.code, flag: c.flag })) : []
        }
        onSelect={(v) => updateForm('country', v)}
      />
      <CategorySelectorBottomSheet
        isOpen={showRegion}
        onClose={() => setShowRegion(false)}
        selectedValue={formData.region}
        data={[
          { label: t('Hammasi'), value: 'all' },
          ...regions.map((r) => ({ label: r.name, value: r.code })),
        ]}
        onSelect={(v) => updateForm('region', v)}
      />
      <CategorySelectorBottomSheet
        isOpen={showDistrict}
        onClose={() => setShowDistrict(false)}
        selectedValue={formData.district}
        data={[
          { label: t('Hammasi'), value: 'all' },
          ...districts.map((d) => ({ label: d.name, value: d.code })),
        ]}
        onSelect={(v) => updateForm('district', v)}
      />
    </ScrollView>
  );
});

export default StepThree;

const styles = StyleSheet.create({
  container: { flexGrow: 1 },
  label: { fontSize: 14, fontWeight: '700', marginBottom: 6, marginTop: 10 },
  pickerButton: {
    borderWidth: 1,
    borderRadius: 12,
    padding: 16,
    marginBottom: 12,
  },
  pickerText: { fontSize: 16 },
  sectionTitle: { fontSize: 16, fontWeight: '700', marginVertical: 12 },
  companyItem: {
    width: 55,
    height: 55,
    borderRadius: ITEM_SIZE / 2,
    borderWidth: 1,
    alignItems: 'center',
    justifyContent: 'center',
  },
  companyText: { fontSize: 14 },
  companyTextActive: { fontWeight: '600' },
  priceCard: {
    marginTop: 24,
    padding: 20,
    borderRadius: 16,
    borderWidth: 1,
    gap: 8,
  },
  priceLine: { fontSize: 15 },
  totalPrice: { fontSize: 18, fontWeight: '700', marginTop: 6 },
  error: { fontWeight: '600', marginBottom: 10 },
  selectAllButton: {
    paddingHorizontal: 16,
    paddingVertical: 8,
    borderRadius: 8,
    borderWidth: 1,
  },
  selectAllText: {
    fontSize: 14,
    fontWeight: '600',
  },
});
