// src/components/EventCommentSection/CommentItem.js
/**
 * 单条评论组件
 * 功能：显示用户头像、昵称、时间、评论内容、删除按钮
 */

import React, { useState } from 'react';
import {
  Box,
  HStack,
  VStack,
  Avatar,
  Text,
  IconButton,
  useColorModeValue,
  Tooltip,
  AlertDialog,
  AlertDialogBody,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogContent,
  AlertDialogOverlay,
  Button,
  useDisclosure,
} from '@chakra-ui/react';
import { Trash2 } from 'lucide-react';
import dayjs from 'dayjs';
import 'dayjs/locale/zh-cn';

dayjs.locale('zh-cn');

const CommentItem = ({ comment, currentUserId, onDelete }) => {
  const { isOpen, onOpen, onClose } = useDisclosure();
  const cancelRef = React.useRef();
  const [isDeleting, setIsDeleting] = useState(false);
  const itemBg = useColorModeValue('gray.50', 'gray.700');
  const usernameColor = useColorModeValue('gray.800', 'gray.100');
  const timeColor = useColorModeValue('gray.500', 'gray.400');
  const contentColor = useColorModeValue('gray.700', 'gray.300');

  // 判断当前用户是否可以删除此评论
  const canDelete = currentUserId && (
    comment.author?.id === currentUserId ||
    comment.user_id === currentUserId
  );

  // 处理删除
  const handleDelete = async () => {
    if (!onDelete) return;
    setIsDeleting(true);
    try {
      await onDelete(comment.id);
      onClose();
    } catch (error) {
      // 错误由父组件处理
    } finally {
      setIsDeleting(false);
    }
  };

  // 格式化时间
  const formatTime = (timestamp) => {
    const now = dayjs();
    const time = dayjs(timestamp);
    const diffMinutes = now.diff(time, 'minutes');
    const diffHours = now.diff(time, 'hours');
    const diffDays = now.diff(time, 'days');

    if (diffMinutes < 1) {
      return '刚刚';
    } else if (diffMinutes < 60) {
      return `${diffMinutes}分钟前`;
    } else if (diffHours < 24) {
      return `${diffHours}小时前`;
    } else if (diffDays < 7) {
      return `${diffDays}天前`;
    } else {
      return time.format('MM-DD HH:mm');
    }
  };

  return (
    <>
      <Box
        p={3}
        bg={itemBg}
        borderRadius="md"
        transition="all 0.2s"
        _hover={{
          transform: 'translateY(-2px)',
          boxShadow: 'sm',
        }}
        position="relative"
      >
        <HStack align="start" spacing={3}>
          {/* 用户头像 */}
          <Avatar
            size="sm"
            name={comment.author?.username || 'Anonymous'}
            src={comment.author?.avatar}
          />

          {/* 评论内容区 */}
          <VStack align="stretch" flex={1} spacing={1}>
            {/* 用户名和时间 */}
            <HStack spacing={2} justify="space-between">
              <HStack spacing={2}>
                <Text fontSize="sm" fontWeight="bold" color={usernameColor}>
                  {comment.author?.username || 'Anonymous'}
                </Text>
                <Text fontSize="xs" color={timeColor}>
                  {formatTime(comment.created_at)}
                </Text>
              </HStack>

              {/* 删除按钮 - 只对自己的评论显示 */}
              {canDelete && (
                <Tooltip label="删除评论" placement="top">
                  <IconButton
                    icon={<Trash2 size={14} />}
                    size="xs"
                    variant="ghost"
                    colorScheme="red"
                    aria-label="删除评论"
                    onClick={onOpen}
                    opacity={0.6}
                    _hover={{ opacity: 1 }}
                  />
                </Tooltip>
              )}
            </HStack>

            {/* 评论内容 */}
            <Text fontSize="sm" color={contentColor} lineHeight="1.6">
              {comment.content}
            </Text>
          </VStack>
        </HStack>
      </Box>

      {/* 删除确认对话框 */}
      <AlertDialog
        isOpen={isOpen}
        leastDestructiveRef={cancelRef}
        onClose={onClose}
        isCentered
      >
        <AlertDialogOverlay>
          <AlertDialogContent>
            <AlertDialogHeader fontSize="lg" fontWeight="bold">
              删除评论
            </AlertDialogHeader>

            <AlertDialogBody>
              确定要删除这条评论吗？此操作不可撤销。
            </AlertDialogBody>

            <AlertDialogFooter>
              <Button ref={cancelRef} onClick={onClose} isDisabled={isDeleting}>
                取消
              </Button>
              <Button
                colorScheme="red"
                onClick={handleDelete}
                ml={3}
                isLoading={isDeleting}
                loadingText="删除中..."
              >
                删除
              </Button>
            </AlertDialogFooter>
          </AlertDialogContent>
        </AlertDialogOverlay>
      </AlertDialog>
    </>
  );
};

export default CommentItem;