import { useState, useCallback } from 'react';
import { useEditorStore } from '../store/editorStore';
import { Terminal, ChevronDown, ChevronUp, Play, Wifi } from 'lucide-react';

export default function DevPanel() {
  const [open, setOpen] = useState(false);
  const [pathInput, setPathInput] = useState('');
  const [testResult, setTestResult] = useState<string | null>(null);
  const [testing, setTesting] = useState(false);

  const { backendUrl, videoPath, loadVideo } = useEditorStore();

  const handleLoad = useCallback(() => {
    const p = pathInput.trim();
    if (p) loadVideo(p);
  }, [pathInput, loadVideo]);

  const testEndpoint = useCallback(async (endpoint: string) => {
    setTesting(true);
    setTestResult(null);
    try {
      const url = `${backendUrl}${endpoint}`;
      const res = await fetch(url);
      const text = res.headers.get('content-type')?.includes('json')
        ? JSON.stringify(await res.json(), null, 2)
        : `${res.status} ${res.statusText} (${res.headers.get('content-type') ?? 'no type'})`;
      setTestResult(`✓ ${url}\n${text}`);
    } catch (e) {
      setTestResult(`✗ ${e}`);
    } finally {
      setTesting(false);
    }
  }, [backendUrl]);

  const testWaveform = useCallback(async () => {
    const p = pathInput.trim() || videoPath;
    if (!p) { setTestResult('No path to test'); return; }
    setTesting(true);
    setTestResult(null);
    try {
      const url = `${backendUrl}/audio/waveform?path=${encodeURIComponent(p)}`;
      const res = await fetch(url);
      if (res.ok) {
        const buf = await res.arrayBuffer();
        setTestResult(`✓ Waveform OK — ${buf.byteLength} bytes\n${url}`);
      } else {
        const body = await res.text().catch(() => '');
        setTestResult(`✗ HTTP ${res.status}\n${body}`);
      }
    } catch (e) {
      setTestResult(`✗ ${e}`);
    } finally {
      setTesting(false);
    }
  }, [backendUrl, pathInput, videoPath]);

  return (
    <div className="fixed bottom-0 right-0 z-50 w-96 font-mono text-[11px]">
      {/* Header */}
      <button
        onClick={() => setOpen(o => !o)}
        className="w-full flex items-center justify-between px-3 py-1.5 bg-[#0d0f1a] border-t border-l border-[#2a2d3e] text-[#6b7280] hover:text-white"
      >
        <span className="flex items-center gap-1.5">
          <Terminal className="w-3 h-3" />
          DevPanel
          <span className="ml-2 text-[#4a4f6a]">{backendUrl}</span>
        </span>
        {open ? <ChevronDown className="w-3 h-3" /> : <ChevronUp className="w-3 h-3" />}
      </button>

      {open && (
        <div className="bg-[#0d0f1a] border-t border-l border-[#2a2d3e] p-3 space-y-3">
          {/* State */}
          <div className="space-y-0.5 text-[#4a4f6a]">
            <div>backendUrl: <span className="text-[#6366f1]">{backendUrl}</span></div>
            <div className="truncate">videoPath: <span className="text-[#6366f1]">{videoPath ?? 'null'}</span></div>
          </div>

          {/* Load file by path */}
          <div className="space-y-1">
            <div className="text-[#6b7280] uppercase tracking-wider text-[9px]">Load file</div>
            <div className="flex gap-1">
              <input
                type="text"
                value={pathInput}
                onChange={e => setPathInput(e.target.value)}
                onKeyDown={e => e.key === 'Enter' && handleLoad()}
                placeholder={videoPath ?? '/path/to/file.wav'}
                className="flex-1 bg-[#13141f] border border-[#2a2d3e] rounded px-2 py-1 text-white placeholder-[#2a2d3e] focus:outline-none focus:border-[#6366f1]"
              />
              <button
                onClick={handleLoad}
                disabled={!pathInput.trim()}
                className="px-2 py-1 bg-[#6366f1] hover:bg-[#4f52d4] disabled:opacity-30 rounded text-white"
              >
                <Play className="w-3 h-3" />
              </button>
            </div>
          </div>

          {/* Quick tests */}
          <div className="space-y-1">
            <div className="text-[#6b7280] uppercase tracking-wider text-[9px]">Test endpoints</div>
            <div className="flex flex-wrap gap-1">
              <button onClick={() => testEndpoint('/health')} className="px-2 py-0.5 bg-[#1e2030] hover:bg-[#2a2d3e] rounded text-[#6b7280] hover:text-white flex items-center gap-1">
                <Wifi className="w-2.5 h-2.5" />/health
              </button>
              <button onClick={() => testEndpoint('/audio/capabilities')} className="px-2 py-0.5 bg-[#1e2030] hover:bg-[#2a2d3e] rounded text-[#6b7280] hover:text-white">
                /audio/capabilities
              </button>
              <button onClick={testWaveform} disabled={testing} className="px-2 py-0.5 bg-[#1e2030] hover:bg-[#2a2d3e] disabled:opacity-40 rounded text-[#6b7280] hover:text-white">
                /audio/waveform
              </button>
            </div>
          </div>

          {/* Result */}
          {testResult && (
            <pre className="bg-[#13141f] border border-[#2a2d3e] rounded p-2 text-[10px] text-[#9ca3af] whitespace-pre-wrap break-all max-h-32 overflow-y-auto">
              {testResult}
            </pre>
          )}
        </div>
      )}
    </div>
  );
}