import { uploadMaterials } from '../src/api/client';

// Background Service Worker —— 唯一出网口（代理图片 fetch / 上传服务端，绕 CORS / 防盗链）
export default defineBackground(() => {
  console.log('[套娃采集助手] background started');

  // 点击扩展图标 → 打开 Side Panel
  chrome.sidePanel.setPanelBehavior({ openPanelOnActionClick: true });

  chrome.runtime.onMessage.addListener((msg, _sender, sendResponse) => {
    if (msg?.action === 'fetchImage') {
      fetchImageAsDataUrl(msg.url)
        .then((dataUrl) => sendResponse({ ok: true, dataUrl }))
        .catch((err) => sendResponse({ ok: false, error: err instanceof Error ? err.message : String(err) }));
      return true; // 保持异步通道
    }

    if (msg?.action === 'uploadMaterials') {
      uploadMaterials(msg.baseUrl, msg.token, msg.payload)
        .then((data) => sendResponse({ ok: true, data }))
        .catch((err) => sendResponse({ ok: false, error: err instanceof Error ? err.message : String(err) }));
      return true;
    }

    return false;
  });
});

/** 代理取图，返回 base64 data URL（结构化克隆可安全跨消息传递） */
async function fetchImageAsDataUrl(url: string): Promise<string> {
  const res = await fetch(url);
  if (!res.ok) throw new Error(`HTTP ${res.status}`);
  const type = res.headers.get('content-type') || 'image/jpeg';
  const buf = await res.arrayBuffer();
  const bytes = new Uint8Array(buf);

  // 分块转二进制串，避免超长参数列表
  let bin = '';
  const chunk = 0x8000;
  for (let i = 0; i < bytes.length; i += chunk) {
    bin += String.fromCharCode(...bytes.subarray(i, i + chunk));
  }
  return `data:${type};base64,${btoa(bin)}`;
}