import { Image } from 'expo-image';
import React, { forwardRef, useImperativeHandle, useState } from 'react';
import { Modal, ScrollView, StyleSheet, Text, TouchableOpacity, View } from 'react-native';

import { Images } from '@/constants/images';

interface BoxItem {
  boxNumber: number;
  leftQuantity: number;
  quantity: number;
  isCompleted: boolean;
}

interface BoxPopupProps {
  onSelect: (item: BoxItem) => void;
}

export interface BoxPopupRef {
  open: (list: BoxItem[]) => void;
  close: () => void;
}

export const BoxPopup = forwardRef<BoxPopupRef, BoxPopupProps>(({ onSelect }, ref) => {
  const [activeBucket, setActiveBucket] = useState(0);
  const [list, setList] = useState<BoxItem[]>([]);
  const [visible, setVisible] = useState(false);

  useImperativeHandle(ref, () => ({
    open: (data: BoxItem[]) => {
      setList(data);
      setActiveBucket(0); // Reset to first bucket
      setVisible(true);
    },
    close: () => setVisible(false),
  }));

  const handleSelect = (item: BoxItem) => {
    onSelect(item);
    setVisible(false);
  };

  // Bucket logic
  const BUCKET_SIZE = 100;
  const buckets = Math.ceil(list.length / BUCKET_SIZE);
  const displayList = list.slice(activeBucket * BUCKET_SIZE, (activeBucket + 1) * BUCKET_SIZE);

  return (
    <Modal visible={visible} transparent animationType="slide" onRequestClose={() => setVisible(false)}>
      <View style={styles.overlay}>
        <View style={styles.container}>
          {/* 标题区域 */}
          <View style={styles.titleSection}>
            <View style={styles.titleBg}>
              <Text style={styles.titleText}>选择盒子</Text>
            </View>
            <TouchableOpacity style={styles.closeBtn} onPress={() => setVisible(false)}>
              <Text style={styles.closeBtnText}>×</Text>
            </TouchableOpacity>
          </View>

          {/* 区间选择器 (仅当数量超过100时显示) */}
          {buckets > 1 && (
            <View style={styles.bucketContainer}>
              <ScrollView horizontal showsHorizontalScrollIndicator={false} contentContainerStyle={styles.bucketScroll}>
                {Array.from({ length: buckets }).map((_, index) => {
                  const start = index * BUCKET_SIZE + 1;
                  const end = Math.min((index + 1) * BUCKET_SIZE, list.length);
                  const isActive = activeBucket === index;
                  return (
                    <TouchableOpacity 
                      key={index} 
                      style={[styles.bucketItem, isActive && styles.bucketItemActive]} 
                      onPress={() => setActiveBucket(index)}
                    >
                      <Text style={[styles.bucketText, isActive && styles.bucketTextActive]}>
                        {start}~{end}
                      </Text>
                    </TouchableOpacity>
                  );
                })}
              </ScrollView>
            </View>
          )}

          {/* 盒子列表 */}
          <View style={styles.content}>
            <ScrollView style={styles.scrollView} showsVerticalScrollIndicator={false}>
              <View style={styles.grid}>
                {displayList.map((item, index) => (
                  <TouchableOpacity key={item.boxNumber} style={styles.item} onPress={() => handleSelect(item)}>
                    <View style={styles.imgBox}>
                      <Image
                        source={{ uri: item.isCompleted ? Images.box.detail.packagingBox2 : Images.box.detail.packagingBox1 }}
                        style={styles.boxImg}
                        contentFit="contain"
                      />
                    </View>
                    <View style={styles.numBadge}>
                      <Text style={styles.numText}>{item.boxNumber}箱</Text>
                    </View>
                    <Text style={styles.remaining}>
                      {item.leftQuantity}/{item.quantity}
                    </Text>
                  </TouchableOpacity>
                ))}
              </View>
            </ScrollView>
          </View>
        </View>
      </View>
    </Modal>
  );
});

const styles = StyleSheet.create({
  overlay: {
    flex: 1,
    backgroundColor: 'rgba(0,0,0,0.5)',
    justifyContent: 'flex-end',
  },
  container: {
    backgroundColor: '#ffc901',
    borderTopLeftRadius: 10,
    borderTopRightRadius: 10,
    maxHeight: '85%', // Increased slightly
    paddingBottom: 20,
  },
  titleSection: {
    position: 'relative',
    alignItems: 'center',
    paddingVertical: 15,
  },
  titleBg: {
    backgroundColor: '#ff8c16',
    paddingHorizontal: 40,
    paddingVertical: 10,
    borderRadius: 20,
  },
  titleText: {
    color: '#fff',
    fontSize: 16,
    fontWeight: 'bold',
  },
  closeBtn: {
    position: 'absolute',
    right: 15,
    top: 10,
    width: 30,
    height: 30,
    justifyContent: 'center',
    alignItems: 'center',
  },
  closeBtnText: {
    fontSize: 24,
    color: '#333',
    fontWeight: 'bold',
  },
  // Bucket Styles
  bucketContainer: {
    marginBottom: 10,
    height: 40,
  },
  bucketScroll: {
    paddingHorizontal: 10,
  },
  bucketItem: {
    paddingHorizontal: 15,
    paddingVertical: 6,
    borderRadius: 15,
    backgroundColor: '#fff',
    marginRight: 10,
    borderWidth: 1,
    borderColor: '#eee',
    justifyContent: 'center',
  },
  bucketItemActive: {
    backgroundColor: '#ff8c16',
    borderColor: '#ff8c16',
  },
  bucketText: {
    fontSize: 12,
    color: '#333',
    fontWeight: '500',
  },
  bucketTextActive: {
    color: '#fff',
    fontWeight: 'bold',
  },
  content: {
    backgroundColor: '#fff',
    marginHorizontal: 10,
    borderRadius: 13,
    borderWidth: 1,
    borderColor: '#000',
    flex: 1, // Let it take remaining space
  },
  scrollView: {
    padding: 10,
  },
  grid: {
    flexDirection: 'row',
    flexWrap: 'wrap',
    paddingBottom: 20,
  },
  item: {
    width: '25%',
    alignItems: 'center',
    marginBottom: 15,
  },
  imgBox: {
    width: 50, // Slightly smaller to fit better
    height: 50,
  },
  boxImg: {
    width: '100%',
    height: '100%',
  },
  numBadge: {
    backgroundColor: '#959595',
    borderRadius: 15,
    paddingHorizontal: 8,
    paddingVertical: 2,
    marginTop: 5,
  },
  numText: {
    color: '#fff',
    fontSize: 10, // Smaller font
    fontWeight: '500',
  },
  remaining: {
    fontSize: 10,
    color: '#999',
    fontWeight: 'bold',
    marginTop: 3,
  },
});