function challengeOptions(job){
  let raw=job&&job.payload;
  if(!raw) return [];
  if(typeof raw==='string'){ try{ raw=JSON.parse(raw); }catch(e){ return []; } }
  const opts=raw&&raw.challenge_options;
  return Array.isArray(opts)?opts.filter(o=>o&&o.id):[];
}
function challengeLabel(opt){
  const label=String((opt&&opt.label)||(opt&&opt.kind)||'验证方式');
  const hint=String((opt&&opt.hint)||'').trim();
  if(!hint || label.indexOf(hint)>=0) return label;
  return label+'（'+hint+'）';
}
async function solve(id){
  const j0=await api('/api/jobs/'+id);
  const hint=String((j0&&j0.challenge_hint)||'');
  const kind=String((j0&&j0.challenge_type)||'');
  const opts=challengeOptions(j0);
  if(kind==='2sv' && opts.length){
    const picked=await askChallenge(j0, opts);
    if(!picked) return;
    const body={choice:String(picked.id||'')};
    if(picked.code) body.code=String(picked.code).trim();
    const j=await api('/api/jobs/'+id+'/challenge',{method:'POST',body:JSON.stringify(body)});
    if(j.error) return fail('无法提交', j.error);
    notice('已选择验证方式', challengeLabel(picked));
    render();
    return;
  }
  if(kind==='prompt'){
    const promptOpt=opts.find(o=>o&&String(o.prompt||'').trim())||opts[0]||{};
    const ok=await askDevicePrompt(j0, promptOpt, hint);
    if(!ok) return;
    const j=await api('/api/jobs/'+id+'/challenge',{method:'POST',body:JSON.stringify({choice:'done'})});
    if(j.error) return fail('无法继续', j.error);
    notice('已确认', '继续登录');
    render();
    return;
  }
  const lines=hint.split('\n').map(s=>s.trim()).filter(Boolean);
  const url=lines.filter(s=>/^https?:\/\//.test(s)).pop()||'';
  const text=lines.filter(s=>s!==url).join('\n')||(kind==='3ds'?'需要 3DS 验证':'请输入验证码');
  const message=text+(url?('\n'+url):'');
  const code=await ask(kind==='3ds'?'3DS 验证':'填写验证码', message, '', '验证码');
  if(code===null) return;
  const j=await api('/api/jobs/'+id+'/challenge',{method:'POST',body:JSON.stringify({code:String(code||'').trim()})});
  if(j.error) return fail('无法提交', j.error);
  notice('已提交验证码', '任务 #'+(j.job_id||id));
  const account=(j0&&j0.account_id)||0;
  if(account) watchAccountJob(account, 'bind', id, '验证卡');
  render();
}
function askDevicePrompt(job, opt, hint){
  return new Promise(resolve=>{
    const root=$('#modalRoot');
    const number=String((opt&&opt.prompt)||'').trim();
    const detail=String((opt&&opt.detail)||'').trim();
    const big=number?'<div class="challenge-number">'+esc(number)+'</div><div class="muted">在已登录的手机或平板上，三个数字里点这一个</div>':'';
    root.innerHTML='<div class="modal-mask"><div class="modal"><h3>在设备上确认</h3>'+
      big+
      (detail?'<div class="body" style="white-space:pre-wrap">'+esc(detail)+'</div>':'')+
      '<div class="body" style="white-space:pre-wrap">'+esc(hint||'请在已登录的手机或平板上按提示确认，完成后继续。')+'</div>'+
      '<div class="actions"><button class="btn" id="mCancel">稍后</button><button class="btn pri" id="mOk">已在设备上确认</button></div></div></div>';
    const close=v=>{ root.innerHTML=''; resolve(v); };
    $('#mCancel').onclick=()=>close(null);
    $('#mOk').onclick=()=>close(true);
    bindMaskClose(root, ()=>close(null));
  });
}
function askChallenge(job, opts){
  return new Promise(resolve=>{
    const root=$('#modalRoot');
    const rows=opts.map((o,i)=>'<label class="challenge-opt"><input type="radio" name="chg" value="'+esc(o.id)+'" '+(i===0?'checked':'')+'>'+
      '<span><b>'+esc(challengeLabel(o))+'</b>'+(o.kind?'<i class="muted"> '+esc(o.kind)+'</i>':'')+'</span></label>').join('');
    const hint=String((job&&job.challenge_hint)||'这个账号需要二次验证。请选择页面上列出的方式。');
    root.innerHTML='<div class="modal-mask"><div class="modal"><h3>选择验证方式</h3>'+
      '<div class="body" style="white-space:pre-wrap">'+esc(hint)+'</div>'+
      '<div class="challenge-list">'+rows+'</div>'+
      '<div class="fields"><label>验证码（选了验证器、邮箱、短信或救援码时填写，设备确认可留空）</label><input id="chgCode" placeholder="验证码或救援码"></div>'+
      '<div class="actions"><button class="btn" id="mCancel">稍后</button><button class="btn pri" id="mOk">用这个方式继续</button></div></div></div>';
    const close=v=>{ root.innerHTML=''; resolve(v); };
    $('#mCancel').onclick=()=>close(null);
    $('#mOk').onclick=()=>{
      const picked=root.querySelector('input[name="chg"]:checked');
      if(!picked) return;
      const opt=opts.find(o=>String(o.id)===picked.value)||{id:picked.value};
      close({id:opt.id, kind:opt.kind, label:opt.label, code:$('#chgCode').value});
    };
    bindMaskClose(root, ()=>close(null));
  });
}