/** Native input while a real progressive copy is still publishing. */
import assert from 'node:assert/strict';

export async function editDuringCopy({call,evaluate,wait,count}){
  assert.ok(count>=1000,'concurrent input probe requires at least 1000 source nodes');
  await wait('window.__canvasPerformance.read().firstPresentedFrameMs!==null','copy did not present before native input');
  assert.equal(await evaluate('window.__canvasPerformance.read().localCompleteMs===null'),true,'copy finished before input probe');
  // Copied cards overlap originals. Find an actually exposed point; never send a
  // synthetic double-click through the copied card to the original underneath.
  const point=await evaluate(`(()=>{
    const label=document.querySelector('.react-flow__node[data-id="perf-0"] [aria-label^="单击选中"]');
    if(!label)throw Error('original text label is missing');
    const rect=label.getBoundingClientRect();
    for(let y=Math.max(0,rect.top)+3;y<Math.min(innerHeight,rect.bottom);y+=6)
      for(let x=Math.max(0,rect.left)+3;x<Math.min(innerWidth,rect.right);x+=6)
        if(label.contains(document.elementFromPoint(x,y)))return{x,y};
    throw Error('original text has no exposed native input point');
  })()`);
  await call('Input.dispatchMouseEvent',{type:'mousePressed',...point,button:'left',buttons:1,clickCount:2});
  await call('Input.dispatchMouseEvent',{type:'mouseReleased',...point,button:'left',buttons:0,clickCount:2});
  await wait(`document.activeElement===document.querySelector('.react-flow__node[data-id="perf-0"] textarea')&&!document.activeElement.readOnly`,'original text did not enter editing during copy');
  await evaluate(`(()=>{
    const element=document.activeElement,samples=[];
    const input=()=>{
      const sample={inputAt:performance.now(),value:element.value,copyActive:window.__canvasPerformance.read().localCompleteMs===null};
      samples.push(sample);
      requestAnimationFrame(()=>requestAnimationFrame(()=>{
        sample.frameAt=performance.now();sample.frameDelayMs=sample.frameAt-sample.inputAt;
        sample.retained=element.isConnected&&document.activeElement===element;
        sample.presentedValue=element.value;sample.mountedNodes=document.querySelectorAll('.react-flow__node').length;
      }));
    };
    element.addEventListener('input',input);
    window.__copyInputProbe={element,samples,dispose(){element.removeEventListener('input',input);}};
  })()`);
  await call('Input.imeSetComposition',{text:'复',selectionStart:1,selectionEnd:1});
  await call('Input.insertText',{text:'复制期间输入'});
  for(const text of [' A',' B',' C']){
    await call('Input.insertText',{text});
    await wait(`window.__copyInputProbe.samples.at(-1)?.frameAt!==undefined`,'native input did not reach its next frame');
  }
  const result=await evaluate(`(()=>{
    const probe=window.__copyInputProbe,result={samples:probe.samples,value:probe.element.value,retained:probe.element.isConnected&&document.activeElement===probe.element};
    probe.dispose();probe.element.blur();delete window.__copyInputProbe;return result;
  })()`);
  assert.equal(result.retained,true,'copy discarded native input DOM or focus');
  assert.ok(result.value.endsWith('复制期间输入 A B C'),'native composition/typing was overwritten');
  assert.ok(result.samples.some(sample=>sample.copyActive),'all native input happened after copy completion');
  assert.ok(result.samples.every(sample=>sample.retained),'copy interrupted an input presentation frame');
  assert.ok(result.samples.every(sample=>sample.mountedNodes<100),'native editing mounted offscreen nodes during copy');
  return result;
}