const redeemApps=[
  {id:'chatgpt', name:'ChatGPT', plugin:'chatgpt'},
  {id:'claude', name:'Claude', plugin:'claude'}
];

function redeemSkus(plugin){
  const rows=(cache.skus||[]).filter(s=>s && (s.plugin||'')===plugin);
  if(rows.length) return rows;
  const fallback={
    chatgpt:[
      ['ChatGPT Go','oai.chatgpt.go'],['ChatGPT Plus','oai.chatgpt.plus'],['ChatGPT Pro','oai.chatgpt.pro'],
      ['ChatGPT Pro Lite','oai.chatgpt.prolite'],['ChatGPT Pro Max','oai.chatgpt.promax']
    ],
    claude:[['Claude Pro','com.anthropic.claude.pro'],['Claude Max','com.anthropic.claude.max']]
  };
  return (fallback[plugin]||[]).map(x=>({title:x[0], sku:x[1], plugin:plugin}));
}

function skuPeriods(sku){
  const offers=(sku&&sku.offers)||[];
  const found=[...new Set(offers.map(o=>String(o.billing_period||'').toUpperCase()).filter(v=>/^P\d+[MY]$/.test(v)))];
  if(!found.length) return ['P1M'];
  return found.sort((a,b)=>a.endsWith('M')&&b.endsWith('Y')?-1:a.endsWith('Y')&&b.endsWith('M')?1:a.localeCompare(b));
}

function viewRedeem(){
  const state=window._redeem||{app:'chatgpt'};
  window._redeem=state;
  const app=redeemApps.some(a=>a.id===state.app)?state.app:'chatgpt';
  state.app=app;
  const skus=redeemSkus(app==='claude'?'claude':'chatgpt');
  if(!skus.some(s=>s.sku===state.sku)) state.sku=skus[0]?skus[0].sku:'';
  const radios=skus.map(s=>'<label class="sku-radio"><input type="radio" name="redeemSku" value="'+esc(s.sku)+'"'+(state.sku===s.sku?' checked':'')+' onchange="window._redeem.sku=this.value; viewRedeem()"><span><strong>'+esc(s.title||s.sku)+'</strong><small>'+esc(s.sku)+'</small></span></label>').join('');
  const selected=skus.find(s=>s.sku===state.sku)||skus[0]||{};
  const periods=skuPeriods(selected);
  if(!periods.includes(state.period)) state.period=periods.includes('P1M')?'P1M':periods[0];
  const periodRadios=periods.map(p=>'<label class="sku-radio"><input type="radio" name="redeemPeriod" value="'+esc(p)+'"'+(state.period===p?' checked':'')+' onchange="window._redeem.period=this.value"><span><strong>'+esc(p)+'</strong><small>'+(p.endsWith('Y')?'按年':'按月')+'</small></span></label>').join('');
  const fields=app==='claude'
    ? '<label>sessionKey</label><input id="redeemSession" type="password" value="'+esc(state.session||'')+'" oninput="window._redeem.session=this.value">'+
      '<div class="muted">粘贴 Claude 的 sessionKey。</div>'
    : '<label>ChatGPT session JSON</label><textarea id="redeemAccount" rows="8" oninput="window._redeem.account=this.value; checkChatSession(this.value)">'+esc(state.account||'')+'</textarea>'+
      '<div class="muted">ChatGPT账号 JSON <a href="https://chatgpt.com/api/auth/session" target="_blank" rel="noopener">https://chatgpt.com/api/auth/session</a></div>'+
      '<div id="redeemCheck" class="muted"></div>';
  $('#app').innerHTML=
    '<div class="card redeem-layout"><div class="redeem-side"><div class="muted">应用</div><div class="mode-picks">'+
      redeemApps.map(a=>'<label class="mode-pick"><input type="radio" name="redeemApp" value="'+a.id+'"'+(app===a.id?' checked':'')+' onchange="window._redeem.app=this.value; viewRedeem()"><span class="mode-copy"><strong>'+a.name+'</strong></span></label>').join('')+
    '</div></div><div class="redeem-main"><h3 style="margin-top:0">'+esc(redeemApps.find(a=>a.id===app).name)+' 兑换</h3>'+
    '<div class="muted" style="margin-bottom:12px">'+(app==='claude'?'提交 sessionKey，由 Anthropic 接收 purchase token。':'提交账号 JSON 或 account id，由 RevenueCat 接收 purchase token。')+'</div>'+
    '<div class="sku-row">'+radios+'</div><div class="muted">套餐周期</div><div class="sku-row">'+periodRadios+'</div>'+fields+
    '<div class="actions"><button class="btn pri" onclick="submitRedeem()">提交兑换</button></div>'+
    '<pre id="redeemOut" class="mono">'+esc(state.out||'')+'</pre></div></div>';
}

function parseChatSession(text){
  const raw=String(text||'').trim();
  if(!raw) return {ok:false, error:'请粘贴 /api/auth/session 的 JSON'};
  let data;
  try{ data=JSON.parse(raw); }
  catch(e){ return {ok:false, error:'不是合法 JSON'}; }
  const account=data.account||{};
  const id=account.id||(data.user&&data.user.id)||data.accountId||'';
  if(!id) return {ok:false, error:'JSON 中没有 account.id 或 user.id'};
  const plan=account.planType||(data.user&&data.user.planType)||data.planType||'未知';
  return {ok:true, id:String(id), plan:String(plan), email:account.email||(data.user&&data.user.email)||''};
}
function checkChatSession(text){
  const box=$('#redeemCheck');
  if(!box) return;
  const parsed=parseChatSession(text);
  box.textContent=parsed.ok?('账号 '+parsed.id+(parsed.email?' · '+parsed.email:'')+' · 当前订阅 '+(parsed.plan==='free'?'Free':parsed.plan)):parsed.error;
  box.style.color=parsed.ok?'var(--ok)':'var(--bad)';
}

async function submitRedeem(){
  const state=window._redeem||{};
  const picked=document.querySelector('input[name=redeemSku]:checked');
  const sku=picked?picked.value:'';
  if(!sku){ fail('无法兑换','请选择 SKU'); return; }
  const body={app:state.app, sku:sku};
  if(state.app!=='claude'){
    const account=($('#redeemAccount')||{}).value||'';
    const parsed=parseChatSession(account);
    if(!parsed.ok){ fail('JSON 格式不对', parsed.error); return; }
    body.auth=account.trim();
  }else{
    body.auth=($('#redeemSession')||{}).value||'';
  }
  const res=await api('/api/admin/redeem',{method:'POST',body:JSON.stringify(body)});
  state.out=JSON.stringify(res,null,2);
  viewRedeem();
  if(!res.flow_id) return;
  const timer=setInterval(async()=>{
    const cur=await api('/api/admin/redeem/'+res.flow_id);
    state.out=JSON.stringify(cur,null,2);
    const box=$('#redeemOut');
    if(box) box.textContent=state.out;
    if(['succeeded','failed','pending_payment'].includes(cur.stage)) clearInterval(timer);
  },2000);
}