const OFFLINE_QUEUE_KEY = 'hss_offline_queue';

class OfflineQueue {
  constructor() {
    try { this.queue = uni.getStorageSync(OFFLINE_QUEUE_KEY) || []; }
    catch (e) { this.queue = []; }
  }

  add(item) {
    this.queue.push({ ...item, createdAt: Date.now() });
    this.save();
  }

  save() { uni.setStorageSync(OFFLINE_QUEUE_KEY, this.queue); }

  getPending() { return [...this.queue]; }
  getCount() { return this.queue.length; }

  async retry(apiPost) {
    const failed = [];
    for (const item of this.queue) {
      try {
        const res = await apiPost(item.path, item.data);
        if (res.data && (res.data.code === 200 || res.data.code === '200')) continue;
        failed.push(item);
      } catch (e) { failed.push(item); }
    }
    this.queue = failed;
    this.save();
    return { success: failed.length === 0, total: this.getCount(), remaining: failed.length };
  }

  clear() { this.queue = []; this.save(); }
}

module.exports = { OfflineQueue };