professor/components/chat/TaskCard.tsx

'use client';

import { useState } from 'react';
import ReactMarkdown from 'react-markdown';
import remarkGfm from 'remark-gfm';
import type { Task } from '@/types';

interface Props {
  task: Task | null;
  isLoading: boolean;
  streamingContent: string;
}

export default function TaskCard({ task, isLoading, streamingContent }: Props) {
  const [collapsed, setCollapsed] = useState(false);

  if (!isLoading && !task) return null;

  return (
    <div className="border-b border-zinc-700 bg-zinc-800/50">
      <button
        onClick={() => setCollapsed((c) => !c)}
        className="flex w-full items-center gap-2 px-4 py-3 text-left hover:bg-zinc-800 transition-colors"
      >
        <span className="text-xs text-zinc-400">{collapsed ? '▶' : '▼'}</span>
        <span className="text-xs font-semibold uppercase tracking-wider text-blue-400">
          {isLoading ? 'Generating task…' : task?.title ?? 'Task'}
        </span>
      </button>

      {!collapsed && (
        <div className="px-4 pb-4 text-sm text-zinc-300">
          {isLoading ? (
            <div className="space-y-2">
              {/* Skeleton shimmer while task streams in */}
              {streamingContent ? (
                <p className="whitespace-pre-wrap text-xs text-zinc-400 font-mono">{streamingContent}</p>
              ) : (
                <>
                  <div className="h-3 w-3/4 animate-pulse rounded bg-zinc-700" />
                  <div className="h-3 w-full animate-pulse rounded bg-zinc-700" />
                  <div className="h-3 w-2/3 animate-pulse rounded bg-zinc-700" />
                </>
              )}
            </div>
          ) : task ? (
            <div className="space-y-3">
              <ReactMarkdown
                remarkPlugins={[remarkGfm]}
                components={{
                  p: ({ children }) => <p className="leading-relaxed text-zinc-300">{children}</p>,
                  ul: ({ children }) => <ul className="list-disc pl-5 space-y-1">{children}</ul>,
                  li: ({ children }) => <li className="text-zinc-400">{children}</li>,
                  strong: ({ children }) => <strong className="font-semibold text-zinc-200">{children}</strong>,
                  code: ({ children }) => (
                    <code className="rounded bg-zinc-700 px-1 py-0.5 text-xs font-mono text-zinc-300">
                      {children}
                    </code>
                  ),
                }}
              >
                {task.description}
              </ReactMarkdown>

              {task.hints.length > 0 && (
                <div>
                  <p className="mb-1 text-xs font-semibold text-zinc-500 uppercase tracking-wider">Hints</p>
                  <ul className="list-disc pl-5 space-y-1">
                    {task.hints.map((hint, i) => (
                      <li key={i} className="text-xs text-zinc-500">{hint}</li>
                    ))}
                  </ul>
                </div>
              )}
            </div>
          ) : null}
        </div>
      )}
    </div>
  );
}