import { useTheme } from '@/components/ThemeContext';
import { useGlobalRefresh } from '@/components/ui/RefreshContext';
import { useInfiniteQuery } from '@tanstack/react-query';
import { router } from 'expo-router';
import { ArrowLeft, Award, Percent } from 'lucide-react-native';
import { useTranslation } from 'react-i18next';
import { ActivityIndicator, FlatList, Pressable, StyleSheet, Text, View } from 'react-native';
import { RefreshControl } from 'react-native-gesture-handler';
import { user_api } from '../lib/api';

const PAGE_SIZE = 10;

export default function BonusesScreen() {
  const { onRefresh, refreshing } = useGlobalRefresh();
  const { t } = useTranslation();

  const { isDark } = useTheme();

  const formatAmount = (amount: number) => {
    return new Intl.NumberFormat('uz-UZ').format(amount) + " so'm";
  };

  const { data, isLoading, isError, fetchNextPage, hasNextPage } = useInfiniteQuery({
    queryKey: ['my_bonuses'],
    queryFn: async ({ pageParam = 1 }) => {
      const res = await user_api.my_bonuses({
        page: pageParam,
        page_size: PAGE_SIZE,
      });

      const d = res?.data?.data;
      return {
        results: d?.results ?? [],
        current_page: d?.current_page ?? 1,
        total_pages: d?.total_pages ?? 1,
      };
    },
    getNextPageParam: (lastPage) =>
      lastPage.current_page < lastPage.total_pages ? lastPage.current_page + 1 : undefined,
    initialPageParam: 1,
  });

  const allBonuses = data?.pages.flatMap((p) => p.results) ?? [];

  if (isLoading) {
    return (
      <View style={[styles.center, { backgroundColor: isDark ? '#0f172a' : '#f8fafc' }]}>
        <ActivityIndicator size={'large'} />
      </View>
    );
  }

  if (isError) {
    return (
      <View style={[styles.center, { backgroundColor: isDark ? '#0f172a' : '#f8fafc' }]}>
        <Text style={styles.error}>{t('Xatolik yuz berdi')}</Text>
      </View>
    );
  }

  return (
    <View style={[styles.container, { backgroundColor: isDark ? '#0f172a' : '#f8fafc' }]}>
      <View style={[styles.topHeader, { backgroundColor: isDark ? '#0f172a' : '#ffffff' }]}>
        <Pressable onPress={() => router.push('/profile')}>
          <ArrowLeft color={isDark ? '#fff' : '#0f172a'} />
        </Pressable>
        <Text style={[styles.headerTitle, { color: isDark ? '#fff' : '#0f172a' }]}>
          {t('Bonuslar')}
        </Text>
      </View>
      <FlatList
        data={allBonuses}
        keyExtractor={(item) => item.id.toString()}
        onEndReached={() => hasNextPage && fetchNextPage()}
        refreshControl={
          <RefreshControl
            refreshing={refreshing}
            onRefresh={onRefresh}
            colors={['#2563eb']}
            tintColor="#2563eb"
          />
        }
        contentContainerStyle={styles.list}
        renderItem={({ item }) => (
          <View
            style={[
              styles.card,
              {
                backgroundColor: isDark ? '#1e293b' : '#ffffff',
                borderColor: isDark ? '#fbbf2420' : '#e2e8f0',
                shadowColor: isDark ? '#000' : '#0f172a',
                shadowOffset: { width: 0, height: 4 },
                shadowOpacity: isDark ? 0.3 : 0.08,
                shadowRadius: 12,
                elevation: 4,
              },
            ]}
          >
            <View style={styles.header}>
              <View
                style={[
                  styles.iconContainer,
                  { backgroundColor: isDark ? '#3b82f614' : '#dbeafe' },
                ]}
              >
                <Award size={28} color="#3b82f6" />
              </View>
              <View
                style={[
                  styles.percentageBadge,
                  { backgroundColor: isDark ? '#10b98120' : '#d1fae5' },
                ]}
              >
                <Text style={[styles.percentageText, { color: isDark ? '#10b981' : '#059669' }]}>
                  {item.percent}
                </Text>
                <Percent size={16} color={isDark ? '#10b981' : '#059669'} />
              </View>
            </View>

            <Text style={[styles.title, { color: isDark ? '#f8fafc' : '#0f172a' }]}>
              {item.ad.title}
            </Text>
            <Text style={[styles.description, { color: isDark ? '#94a3b8' : '#64748b' }]}>
              {item.ad.description}
            </Text>

            <View style={[styles.footer, { borderTopColor: isDark ? '#334155' : '#e2e8f0' }]}>
              <View style={styles.amountContainer}>
                <Text style={[styles.amountLabel, { color: isDark ? '#64748b' : '#94a3b8' }]}>
                  {t('Bonus miqdori')}
                </Text>
                <Text style={styles.amount}>{formatAmount(item.amount)}</Text>
              </View>
              <View style={styles.dateContainer}>
                <Text style={[styles.dateLabel, { color: isDark ? '#64748b' : '#94a3b8' }]}>
                  {t('Yaratilgan sana')}
                </Text>
                <Text style={[styles.date, { color: isDark ? '#94a3b8' : '#64748b' }]}>
                  {new Date(item.created_at).toLocaleDateString('uz-UZ')}
                </Text>
              </View>
            </View>
          </View>
        )}
        ListEmptyComponent={
          <View style={styles.emptyContainer}>
            <Award size={64} color={isDark ? '#334155' : '#cbd5e1'} />
            <Text style={[styles.emptyText, { color: isDark ? '#64748b' : '#94a3b8' }]}>
              {t("Hozircha bonuslar yo'q")}
            </Text>
          </View>
        }
      />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
  },
  list: {
    padding: 16,
    gap: 16,
    paddingBottom: 30,
    flexGrow: 1
  },
  card: {
    borderRadius: 20,
    padding: 20,
    gap: 16,
    borderWidth: 1.5,
  },
  header: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
  },
  iconContainer: {
    width: 64,
    height: 64,
    borderRadius: 32,
    alignItems: 'center',
    justifyContent: 'center',
  },
  percentageBadge: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: 4,
    paddingHorizontal: 16,
    paddingVertical: 10,
    borderRadius: 20,
  },
  percentageText: {
    fontSize: 17,
    fontWeight: '700' as const,
  },
  title: {
    fontSize: 20,
    fontWeight: '700' as const,
    lineHeight: 26,
  },
  description: {
    fontSize: 15,
    lineHeight: 22,
  },
  footer: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'flex-start',
    paddingTop: 12,
    borderTopWidth: 1,
  },
  amountContainer: {
    gap: 6,
  },
  amountLabel: {
    fontSize: 12,
    fontWeight: '500' as const,
  },
  amount: {
    fontSize: 22,
    fontWeight: '700' as const,
    color: '#3b82f6',
  },
  dateContainer: {
    gap: 6,
    alignItems: 'flex-end',
  },
  dateLabel: {
    fontSize: 12,
    fontWeight: '500' as const,
  },
  date: {
    fontSize: 14,
    fontWeight: '600' as const,
  },
  emptyContainer: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    paddingVertical: 80,
    gap: 16,
  },
  emptyText: {
    fontSize: 17,
    fontWeight: '600' as const,
  },
  topHeader: {
    flexDirection: 'row',
    gap: 10,
    padding: 16,
    alignItems: 'center',
    shadowColor: '#000',
    shadowOffset: { width: 0, height: 2 },
    shadowOpacity: 0.1,
    shadowRadius: 4,
    elevation: 3,
  },
  headerTitle: {
    fontSize: 18,
    fontWeight: '700',
    flex: 1,
  },
  themeToggle: {
    padding: 8,
  },
  center: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
  loading: {
    fontSize: 16,
    fontWeight: '500',
  },
  error: {
    color: '#ef4444',
    fontSize: 16,
    fontWeight: '500',
  },
});