import React, { useState, useCallback } from 'react';
import {
  View,
  Text,
  FlatList,
  TouchableOpacity,
  StatusBar,
  ToastAndroid,
  Platform,
} from 'react-native';
import { useFocusEffect } from '@react-navigation/native';
import { getStyles } from './offersScreen.styles';
import { Header } from '@components';
import { useAppTheme } from '@theme';
import { useAppDispatch, useAppSelector, getAllOffersThunk } from '@store';
import { Promotion, PromotionType } from '@interfaces';
import Clipboard from '@react-native-clipboard/clipboard';

const getPromoVisuals = (type: PromotionType) => {
  switch (type) {
    case 'FREE_DELIVERY':
      return {
        emoji: '🛵',
        bgColor: '#E8F5E9',
        badgeBg: '#C8E6C9',
        textColor: '#1B5E20',
      };
    case 'PERCENTAGE_DISCOUNT':
      return {
        emoji: '🏷️',
        bgColor: '#FFF3E0',
        badgeBg: '#FFE0B2',
        textColor: '#E65100',
      };
    case 'FLAT_DISCOUNT':
      return {
        emoji: '💰',
        bgColor: '#E3F2FD',
        badgeBg: '#BBDEFB',
        textColor: '#0D47A1',
      };
    case 'BUY_ONE_GET_ONE':
      return {
        emoji: '🎁',
        bgColor: '#F3E5F5',
        badgeBg: '#E1BEE7',
        textColor: '#4A148C',
      };
    default:
      return {
        emoji: '🎉',
        bgColor: '#F5F5F5',
        badgeBg: '#E0E0E0',
        textColor: '#333333',
      };
  }
};

export const OffersScreen: React.FC = () => {
  const { colors, isDarkMode } = useAppTheme();
  const styles = getStyles(colors);
  const dispatch = useAppDispatch();
  const { offers, isLoading } = useAppSelector(state => state.offer);

  const [copiedId, setCopiedId] = useState<string | null>(null);

  useFocusEffect(
    useCallback(() => {
      dispatch(getAllOffersThunk());
    }, [dispatch]),
  );

  const handleCopy = (item: Promotion) => {

    Clipboard.setString(item.badgeText);
    setCopiedId(item.id);
    // const textToCopy = item.badgeText || item.title;
    // if (Platform.OS === 'android') {
    //   ToastAndroid.show(`Copied "${textToCopy}"`, ToastAndroid.SHORT);
    // }
    setTimeout(() => {
      setCopiedId(prev => (prev === item.id ? null : prev));
    }, 2000);
  };

  const renderOfferCard = ({ item }: { item: Promotion }) => {
    const visuals = getPromoVisuals(item.promotionType);
    const isCopied = copiedId === item.id;

    const hasFooter =
      (item.minimumOrderAmount && item.minimumOrderAmount > 0) ||
      (item.maximumDiscount && item.maximumDiscount > 0) ||
      (item.applicableCategories && item.applicableCategories.length > 0) ||
      (item.applicableProducts && item.applicableProducts.length > 0);

    return (
      <View style={styles.offerCard}>
        {/* Main Card Header */}
        <View style={styles.cardHeaderRow}>
          <View style={[styles.iconWrap, { backgroundColor: visuals.bgColor }]}>
            <Text style={styles.iconEmoji}>{visuals.emoji}</Text>
          </View>

          <View style={styles.offerInfo}>
            {!!item.badgeText && (
              <View
                style={[
                  styles.badgeContainer,
                  { backgroundColor: visuals.badgeBg },
                ]}
              >
                <Text style={[styles.badgeText, { color: visuals.textColor }]}>
                  {item.badgeText}
                </Text>
              </View>
            )}
            <Text style={styles.offerTitle}>{item.title}</Text>
            {!!item.description && (
              <Text style={styles.offerDescription}>{item.description}</Text>
            )}
          </View>

          <TouchableOpacity
            style={[styles.copyButton, isCopied && styles.copyButtonSuccess]}
            onPress={() => handleCopy(item)}
            // onPress={() => { }}
            activeOpacity={0.8}
          >
            <Text style={styles.copyButtonText}>
              {isCopied ? 'Copied ✓' : 'Copy'}
            </Text>
          </TouchableOpacity>
        </View>

        {/* Dynamic Meta Details Footer (Only if real data exists) */}
        {hasFooter && (
          <View style={styles.cardFooter}>
            {!!item.minimumOrderAmount && item.minimumOrderAmount > 0 && (
              <View style={styles.metaChip}>
                <Text style={styles.metaChipText}>
                  Min order ₹{item.minimumOrderAmount}
                </Text>
              </View>
            )}

            {!!item.maximumDiscount && item.maximumDiscount > 0 && (
              <View style={styles.metaChip}>
                <Text style={styles.metaChipText}>
                  Max discount ₹{item.maximumDiscount}
                </Text>
              </View>
            )}

            {!!item.applicableCategories?.length && (
              <View style={styles.metaChip}>
                <Text style={styles.metaChipText}>
                  {item.applicableCategories.length}{' '}
                  {item.applicableCategories.length === 1
                    ? 'category'
                    : 'categories'}
                </Text>
              </View>
            )}

            {!!item.applicableProducts?.length && (
              <View style={styles.metaChip}>
                <Text style={styles.metaChipText}>
                  {item.applicableProducts.length}{' '}
                  {item.applicableProducts.length === 1 ? 'item' : 'items'}
                </Text>
              </View>
            )}
          </View>
        )}
      </View>
    );
  };

  const renderSkeleton = () => (
    <View style={styles.list}>
      {[1, 2, 3].map(key => (
        <View key={key} style={styles.skeletonCard}>
          <View style={styles.skeletonLineShort} />
          <View style={styles.skeletonLineLong} />
          <View style={styles.skeletonLineSub} />
        </View>
      ))}
    </View>
  );

  const renderEmpty = () => (
    <View style={styles.emptyWrap}>
      <View style={styles.emptyIconWrap}>
        <Text style={styles.emptyEmoji}>🏷️</Text>
      </View>
      <Text style={styles.emptyTitle}>No Offers Available</Text>
      <Text style={styles.emptySubtitle}>
        There are currently no active promotions.{'\n'}Check back later for
        exciting discounts and deals!
      </Text>
    </View>
  );

  return (
    <View style={styles.container}>
      <StatusBar
        barStyle={isDarkMode ? 'light-content' : 'dark-content'}
        backgroundColor={colors.background}
      />
      <Header title="Offers" />

      {isLoading && (!offers || offers.length === 0) ? (
        renderSkeleton()
      ) : (
        <FlatList
          data={offers || []}
          keyExtractor={item => item.id}
          renderItem={renderOfferCard}
          ListEmptyComponent={renderEmpty}
          contentContainerStyle={styles.list}
          showsVerticalScrollIndicator={false}
        />
      )}
    </View>
  );
};