/**
 * 长按菜单组件 - 气泡旁边弹出形式（类似手机QQ）
 */

import React, { useRef, useEffect } from 'react';
import {
  View,
  Modal,
  TouchableOpacity,
  Pressable,
  Animated,
  Alert,
  Clipboard,
  Dimensions,
  Platform,
} from 'react-native';
import { MaterialCommunityIcons } from '@expo/vector-icons';
import { useChatScreenStyles } from './styles';
import { LongPressMenuProps } from './types';
import { RECALL_TIME_LIMIT } from './constants';
import { extractTextFromSegments, ImageSegmentData } from '../../../../types/dto';
import { isStickerExists, addStickerFromUrl } from '../../../../services/stickerService';

const { width: SCREEN_WIDTH, height: SCREEN_HEIGHT } = Dimensions.get('window');

export const LongPressMenu: React.FC<LongPressMenuProps> = ({
  visible,
  message,
  currentUserId,
  position,
  onClose,
  onReply,
  onRecall,
  onDelete,
  onAddSticker,
}) => {
  const styles = useChatScreenStyles();
  const scaleAnimation = useRef(new Animated.Value(0)).current;
  const opacityAnimation = useRef(new Animated.Value(0)).current;
  const blurActiveElementOnWeb = () => {
    if (Platform.OS !== 'web') return;
    const active = (globalThis as any)?.document?.activeElement as { blur?: () => void } | undefined;
    active?.blur?.();
  };

  // 显示动画 - 缩放弹出
  useEffect(() => {
    if (visible) {
      blurActiveElementOnWeb();
      Animated.parallel([
        Animated.spring(scaleAnimation, {
          toValue: 1,
          useNativeDriver: Platform.OS !== 'web',
          friction: 8,
          tension: 100,
        }),
        Animated.timing(opacityAnimation, {
          toValue: 1,
          duration: 150,
          useNativeDriver: Platform.OS !== 'web',
        }),
      ]).start();
    } else {
      blurActiveElementOnWeb();
      Animated.parallel([
        Animated.timing(scaleAnimation, {
          toValue: 0,
          duration: 150,
          useNativeDriver: Platform.OS !== 'web',
        }),
        Animated.timing(opacityAnimation, {
          toValue: 0,
          duration: 150,
          useNativeDriver: Platform.OS !== 'web',
        }),
      ]).start();
    }
  }, [visible, scaleAnimation, opacityAnimation]);

  if (!message) return null;

  const isMyMessage = message.sender_id === currentUserId;
  const messageTime = new Date(message.created_at).getTime();
  const now = Date.now();
  const canRecall = isMyMessage &&
                    message.status !== 'recalled' &&
                    (now - messageTime) < RECALL_TIME_LIMIT;

  // 检查是否是图片消息
  const segments = Array.isArray(message.segments) ? message.segments : [];
  const imageSegment = segments.find(s => s.type === 'image');
  const isImageMessage = !!imageSegment;
  const imageUrl = imageSegment ? (imageSegment.data as ImageSegmentData)?.url : null;

  // 复制文本到剪贴板
  const handleCopy = () => {
    const text = extractTextFromSegments(message.segments);
    if (text) {
      Clipboard.setString(text);
      onClose();
    }
  };

  // 多选功能（这里简化为复制全部）
  const handleMultiSelect = () => {
    const text = extractTextFromSegments(message.segments);
    if (text) {
      Clipboard.setString(text);
      onClose();
    }
  };

  const handleDelete = () => {
    Alert.alert(
      '确认删除',
      '删除后，该消息将从你的设备上移除。确定要删除吗？',
      [
        { text: '取消', style: 'cancel' },
        {
          text: '删除',
          style: 'destructive',
          onPress: () => {
            onDelete(message.id);
            onClose();
          },
        },
      ]
    );
  };

  // 添加到表情
  const handleAddSticker = async () => {
    if (!imageUrl) return;

    onClose();

    // 检查是否已存在
    const exists = await isStickerExists(imageUrl);
    if (exists) {
      Alert.alert('提示', '该表情已存在');
      return;
    }

    try {
      const sticker = await addStickerFromUrl(imageUrl);
      if (sticker) {
        Alert.alert('成功', '已添加到表情');
        onAddSticker?.(imageUrl);
      } else {
        Alert.alert('提示', '该表情已存在');
      }
    } catch (error) {
      Alert.alert('失败', '添加表情失败，请重试');
    }
  };

  // 菜单项配置 - 类似QQ的横向排列
  const menuItems = [
    {
      id: 'reply',
      label: '回复',
      icon: 'reply',
      onPress: () => {
        onReply(message);
        onClose();
      },
      show: true,
    },
    {
      id: 'copy',
      label: '复制',
      icon: 'content-copy',
      onPress: handleCopy,
      show: !message.is_system_notice && message.status !== 'recalled',
    },
    {
      id: 'multiSelect',
      label: '多选',
      icon: 'checkbox-multiple-marked-outline',
      onPress: handleMultiSelect,
      show: true,
    },
    {
      id: 'addSticker',
      label: '添加表情',
      icon: 'emoticon-happy-outline',
      onPress: handleAddSticker,
      show: isImageMessage && message.status !== 'recalled',
    },
    {
      id: 'recall',
      label: '撤回',
      icon: 'undo',
      onPress: () => {
        onRecall(message.id);
        onClose();
      },
      show: canRecall,
    },
    {
      id: 'delete',
      label: '删除',
      icon: 'delete-outline',
      onPress: handleDelete,
      show: true,
    },
  ].filter(item => item.show);

  // 计算菜单位置 - 紧贴手指位置显示在气泡上方
  const calculatePosition = () => {
    if (!position) {
      // 默认居中显示
      return {
        top: SCREEN_HEIGHT / 2 - 50,
        left: SCREEN_WIDTH / 2 - 120,
      };
    }

    const menuWidth = Math.max(menuItems.length * 56, 180);
    const menuHeight = 54;
    
    // 使用按压点位置（手指位置）
    const pressX = position.pressX ?? position.x + position.width / 2;
    const pressY = position.pressY ?? position.y;
    
    // 在手指位置上方显示菜单，留出 8px 间距
    let top = pressY - menuHeight - 8;
    
    // 水平居中于手指位置
    let left = pressX - menuWidth / 2;
    
    // 如果上方空间不足，显示在手指位置下方
    if (top < 50) {
      top = pressY + 8;
    }
    
    // 确保不超出屏幕左右边界
    const minLeft = 8;
    const maxLeft = SCREEN_WIDTH - menuWidth - 8;
    
    if (left < minLeft) left = minLeft;
    if (left > maxLeft) left = maxLeft;
    
    return { top, left };
  };

  const { top, left } = calculatePosition();

  return (
    <Modal
      visible={visible}
      transparent
      animationType="none"
      onShow={blurActiveElementOnWeb}
      onRequestClose={onClose}
    >
      <Pressable
        onPress={() => {
          blurActiveElementOnWeb();
          onClose();
        }}
        style={styles.qqMenuOverlay}
      >
        <View>
          <Pressable onPress={() => {}}>
            <Animated.View
              style={[
                styles.qqMenuContainer,
                {
                  top,
                  left,
                  opacity: opacityAnimation,
                  transform: [
                    { scale: scaleAnimation },
                  ],
                },
              ]}
            >
              {/* 操作按钮横向排列 */}
              <View style={styles.qqMenuItemsRow}>
                {menuItems.map((item, index) => (
                  <TouchableOpacity
                    key={item.id}
                    style={[
                      styles.qqMenuItem,
                      index < menuItems.length - 1 && styles.qqMenuItemWithBorder,
                    ]}
                    onPress={item.onPress}
                    activeOpacity={0.6}
                  >
                    <MaterialCommunityIcons
                      name={item.icon as any}
                      size={20}
                      color="#FFFFFF"
                    />
                    <View style={styles.qqMenuItemLabelContainer}>
                      <Animated.Text style={styles.qqMenuItemLabel}>
                        {item.label}
                      </Animated.Text>
                    </View>
                  </TouchableOpacity>
                ))}
              </View>
            </Animated.View>
          </Pressable>
        </View>
      </Pressable>
    </Modal>
  );
};

export default LongPressMenu;
