/**
 * UserMessage — 用户消息卡片
 *
 * 全宽卡片流布局，左侧头像。
 * 支持附件可视化：图片缩略图、文件卡片。
 */

import { useState, useCallback, useRef, useEffect } from 'react';
import { Box, Typography, Avatar, Stack, TextareaAutosize } from '@mui/material';
import { User, FileText, Image as ImageIcon, X } from 'lucide-react';
import type { ChatMessage, AttachmentInfo } from '@renderer/stores/agent-store';
import { useAgentStore } from '@renderer/stores/agent-store';
import { formatTime, formatFileSize } from '@renderer/lib/formatters';
import { ContextMenu, createContextMenuItems } from '@renderer/components/ContextMenu';

interface UserMessageProps { message: ChatMessage; }

export function UserMessage({ message }: UserMessageProps): React.JSX.Element {
  const [editing, setEditing] = useState(false);
  const [editContent, setEditContent] = useState(message.content);
  const [contextMenu, setContextMenu] = useState<{ x: number; y: number } | null>(null);
  const textareaRef = useRef<HTMLTextAreaElement>(null);
  const updateMessage = useAgentStore((s) => s.updateMessage);

  const handleDoubleClick = useCallback(() => { setEditing(true); setEditContent(message.content); }, [message.content]);
  const handleEditSave = useCallback(() => {
    if (editContent.trim() && editContent !== message.content) updateMessage(message.id, { content: editContent.trim() });
    setEditing(false);
  }, [editContent, message.content, message.id, updateMessage]);
  const handleEditKeyDown = useCallback((e: React.KeyboardEvent) => {
    if (e.key === 'Escape') { setEditing(false); setEditContent(message.content); }
    if (e.key === 'Enter' && (e.ctrlKey || e.metaKey)) handleEditSave();
  }, [handleEditSave, message.content]);
  useEffect(() => { if (editing) textareaRef.current?.focus(); }, [editing]);

  const hasAttachments = message.attachments && message.attachments.length > 0;

  return (
    <Stack direction="row" spacing={1.5} sx={{ animation: 'fadeInUp 300ms ease-out' }}>
      <Avatar sx={{ width: 32, height: 32, bgcolor: 'action.hover', color: 'primary.main', flexShrink: 0 }}><User size={16} /></Avatar>
      <Box
        sx={{ maxWidth: 768, borderRadius: 3, px: 2, py: 1.5, cursor: 'default', bgcolor: 'background.paper', border: '1px solid', borderColor: 'divider' }}
        onDoubleClick={handleDoubleClick}
        onContextMenu={(e: React.MouseEvent) => { e.preventDefault(); setContextMenu({ x: e.clientX, y: e.clientY }); }}
      >
        {/* 附件预览区 */}
        {hasAttachments && (
          <Stack direction="row" spacing={1} sx={{ mb: message.content ? 1.5 : 0, flexWrap: 'wrap', gap: 1 }}>
            {message.attachments!.map((att) => (
              <AttachmentPreview key={att.id} attachment={att} />
            ))}
          </Stack>
        )}

        {/* 文本内容 */}
        {editing ? (
          <TextareaAutosize ref={textareaRef} value={editContent} onChange={(e) => setEditContent(e.target.value)} onKeyDown={handleEditKeyDown} onBlur={handleEditSave} minRows={3} style={{ width: '100%', background: 'transparent', border: 'none', outline: 'none', color: 'inherit', fontSize: 13, lineHeight: 1.7, resize: 'none', fontFamily: 'inherit' }} />
        ) : message.content ? (
          <Typography sx={{ whiteSpace: 'pre-wrap', fontSize: 13, lineHeight: 1.7, color: 'text.primary' }}>{message.content}</Typography>
        ) : null}

        <Typography variant="caption" sx={{ mt: 0.75, display: 'block', color: 'text.disabled' }}>{formatTime(message.timestamp)}</Typography>
      </Box>
      {contextMenu && <ContextMenu x={contextMenu.x} y={contextMenu.y} items={createContextMenuItems('message', { content: message.content })} onClose={() => setContextMenu(null)} />}
    </Stack>
  );
}

// ===== 附件预览组件 =====

function AttachmentPreview({ attachment }: { attachment: AttachmentInfo }) {
  const { type, name, size, preview } = attachment;

  if (type === 'image' && preview) {
    return (
      <Box sx={{ position: 'relative', width: 120, height: 120, borderRadius: 2, overflow: 'hidden', border: '1px solid', borderColor: 'divider', flexShrink: 0 }}>
        <Box component="img" src={preview} alt={name} sx={{ width: '100%', height: '100%', objectFit: 'cover' }} />
        <Box sx={{ position: 'absolute', bottom: 0, left: 0, right: 0, bgcolor: 'rgba(0,0,0,0.6)', px: 1, py: 0.5 }}>
          <Typography variant="caption" sx={{ color: '#fff', fontSize: 10, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap', display: 'block' }}>
            {name}
          </Typography>
        </Box>
      </Box>
    );
  }

  // 文本文件
  if (type === 'text') {
    return (
      <Box sx={{ display: 'flex', alignItems: 'center', gap: 1, px: 1.5, py: 1, borderRadius: 1.5, bgcolor: 'action.hover', border: '1px solid', borderColor: 'divider', maxWidth: 200, flexShrink: 0 }}>
        <FileText size={20} style={{ color: '#22d3ee', flexShrink: 0 }} />
        <Box sx={{ minWidth: 0 }}>
          <Typography variant="caption" sx={{ display: 'block', overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap', fontSize: 11, color: 'text.primary' }}>{name}</Typography>
          <Typography variant="caption" sx={{ fontSize: 9, color: 'text.secondary' }}>{formatFileSize(size)}</Typography>
        </Box>
      </Box>
    );
  }

  // 其他文件
  return (
    <Box sx={{ display: 'flex', alignItems: 'center', gap: 1, px: 1.5, py: 1, borderRadius: 1.5, bgcolor: 'action.hover', border: '1px solid', borderColor: 'divider', maxWidth: 200, flexShrink: 0 }}>
      <ImageIcon size={20} style={{ color: '#8b8fa7', flexShrink: 0 }} />
      <Box sx={{ minWidth: 0 }}>
        <Typography variant="caption" sx={{ display: 'block', overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap', fontSize: 11, color: 'text.primary' }}>{name}</Typography>
        <Typography variant="caption" sx={{ fontSize: 9, color: 'text.secondary' }}>{formatFileSize(size)}</Typography>
      </Box>
    </Box>
  );
}