// Push queue worker: drains pending items, POSTs to the ingest endpoint,
// removes on success, backs off exponentially on failure, marks failed
// after MAX_RETRIES attempts. Driven by alarms in background.js.
//
// ★ 无状态:每次 processQueue 自己 loadConfig() 从 chrome.storage 读配置,
// 不缓存到模块级变量 —— MV3 SW 休眠重启会清空模块状态,缓存会导致 worker 永不推送(B)。

import { getPending, markStatus } from './queue.js';
import { buildIngestPayload } from './payload.js';
import { loadConfig } from './config.js';

const MAX_RETRIES = 8;

export async function processQueue() {
  const cfg = await loadConfig();
  if (!cfg || !cfg.enabled || !cfg.serverUrl || !cfg.token) {
    return { processed: 0 };
  }
  const items = await getPending(3);
  let processed = 0;
  for (const it of items) {
    try {
      const payload = buildIngestPayload(it.payload.record, it.payload.messages);
      const res = await fetch(`${cfg.serverUrl}/api/ingest`, {
        method: 'POST',
        headers: {
          Authorization: `Bearer ${cfg.token}`,
          'Content-Type': 'application/json',
        },
        body: JSON.stringify(payload),
      });
      if (res.ok) {
        // 标 sent 保留记录供 getStats 统计;旧实现 remove 会让 popup"已推"永远 0(显示 bug)
        await markStatus(it.id, 'sent');
        processed++;
      } else {
        await bumpRetry(it, `HTTP ${res.status}`);
      }
    } catch (e) {
      await bumpRetry(it, String((e && e.message) || e));
    }
  }
  return { processed };
}

async function bumpRetry(it, err) {
  const retries = (it.retries || 0) + 1;
  if (retries >= MAX_RETRIES) {
    await markStatus(it.id, 'failed', { retries, lastError: err });
  } else {
    const delay = Math.min(Math.pow(2, retries) * 1000, 3600 * 1000);
    await markStatus(it.id, 'pending', {
      retries,
      nextRetry: Date.now() + delay,
      lastError: err,
    });
  }
}