professor/components/editor/OutputPanel.tsx

'use client';

import { useState } from 'react';
import type { ExecutionResult } from '@/types';

interface Props {
  result: ExecutionResult | null;
  isLoading: boolean;
}

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

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

  const hasError = result?.error || (result?.stderr && result.stderr.trim());
  const hasOutput = result?.stdout && result.stdout.trim();

  return (
    <div className="border-t border-zinc-700 bg-zinc-900 text-sm font-mono">
      {/* Header bar */}
      <button
        onClick={() => setCollapsed((c) => !c)}
        className="flex w-full items-center gap-2 px-4 py-2 text-xs text-zinc-400 hover:text-zinc-200 transition-colors"
      >
        <span>{collapsed ? '▶' : '▼'}</span>
        <span className="font-sans font-medium uppercase tracking-wider">Output</span>
        {result && !isLoading && (
          <span
            className={`ml-auto rounded px-1.5 py-0.5 text-xs font-sans ${
              result.exitCode === 0 && !result.error
                ? 'bg-green-900/50 text-green-400'
                : 'bg-red-900/50 text-red-400'
            }`}
          >
            {result.timedOut
              ? 'timed out'
              : result.error
              ? 'error'
              : `exit ${result.exitCode}`}
          </span>
        )}
      </button>

      {/* Content */}
      {!collapsed && (
        <div className="max-h-48 overflow-y-auto px-4 pb-4 space-y-2">
          {isLoading && (
            <div className="flex items-center gap-2 text-zinc-500">
              <div className="h-3 w-3 animate-spin rounded-full border border-zinc-600 border-t-blue-400" />
              <span>Running…</span>
            </div>
          )}

          {result?.error && (
            <pre className="whitespace-pre-wrap text-red-400">{result.error}</pre>
          )}

          {result?.timedOut && !result.error && (
            <p className="text-yellow-400">Execution timed out after 15 seconds.</p>
          )}

          {hasOutput && (
            <pre className="whitespace-pre-wrap text-zinc-200">{result!.stdout}</pre>
          )}

          {hasError && !result?.error && (
            <pre className="whitespace-pre-wrap text-red-400">{result!.stderr}</pre>
          )}

          {result && !isLoading && !result.error && !hasOutput && !hasError && (
            <span className="text-zinc-500 italic">No output</span>
          )}
        </div>
      )}
    </div>
  );
}