'use strict';

// 经营数据定时自动同步
// ----------------------------------------------------------------------------
// 每分钟检查一次：到达配置时间（默认 06:00，本地时区）且今天还没跑过、
// 商家客户端调试端口在线时，自动同步「昨日」数据进本地数据湖。
// - 客户端不在线 → 每分钟重试，当天在线的任意时刻补跑（跨夜作废）
// - 同步失败也计为已跑（避免分钟级重试刷屏）；次日再试
// - 默认关闭，config.json → autoSync.enabled 开启；手动同步不受影响
// - 同步记录照常写入数据湖 syncs，可在「数据报表 → 同步记录」里查看

const fs = require('fs');
const path = require('path');
const naposService = require('../../napos-service.js');

function todayYmd() {
  const d = new Date();
  const z = (n) => String(n).padStart(2, '0');
  return `${d.getFullYear()}${z(d.getMonth() + 1)}${z(d.getDate())}`;
}

function ymdShift(ymd, delta) {
  const d = new Date(Number(ymd.slice(0, 4)), Number(ymd.slice(4, 6)) - 1, Number(ymd.slice(6, 8)));
  d.setDate(d.getDate() + delta);
  const z = (n) => String(n).padStart(2, '0');
  return `${d.getFullYear()}${z(d.getMonth() + 1)}${z(d.getDate())}`;
}

function createAutoSyncService(ctx) {
  const { config, workspace, logs } = ctx;

  const stateFile = () => path.join(workspace.getWorkspaceRoot(), '.genpic', 'auto-sync.json');

  function loadState() {
    try {
      const parsed = JSON.parse(fs.readFileSync(stateFile(), 'utf8'));
      return parsed && typeof parsed.lastRunDate === 'string' ? parsed : {};
    } catch {
      return {};
    }
  }

  function saveState(state) {
    try {
      const file = stateFile();
      fs.mkdirSync(path.dirname(file), { recursive: true });
      const temp = `${file}.${process.pid}.tmp`;
      fs.writeFileSync(temp, JSON.stringify(state, null, 2), 'utf8');
      fs.renameSync(temp, file);
    } catch { /* 状态落盘失败不阻断同步 */ }
  }

  let running = false; // 本服务的单飞标记（与 naposService 的 SYNC_BUSY 双保险）

  async function tick() {
    const cfg = config.autoSync || {};
    if (!cfg.enabled) return;
    if (running) return;
    if (naposService.syncSnapshot().running) return; // 手动同步进行中，让路

    const time = /^\d{1,2}:\d{2}$/.test(String(cfg.time || '')) ? cfg.time : '06:00';
    const [hh, mm] = time.split(':').map(Number);
    const now = new Date();
    const nowMinutes = now.getHours() * 60 + now.getMinutes();
    const schedMinutes = Math.min(23, Math.max(0, hh)) * 60 + Math.min(59, Math.max(0, mm));
    if (nowMinutes < schedMinutes) return;

    const today = todayYmd();
    const state = loadState();
    if (state.lastRunDate === today) return;

    let status;
    try {
      status = await naposService.naposStatus();
    } catch {
      return; // 探测异常，下一分钟再试
    }
    if (!status.connected) return; // 客户端不在线，等待在线时刻补跑

    running = true;
    const from = ymdShift(today, -1);
    saveState({ ...state, lastRunDate: today, lastTriggeredAt: new Date().toISOString() });
    logs.pushSystemLog(`自动同步开始：同步昨日（${from}）经营数据`, 'info');
    try {
      const snap = await naposService.runSync({ from, to: from, scope: 'all' });
      if (snap.error) {
        logs.pushSystemLog(`自动同步失败：${snap.error}`, 'error');
      } else {
        logs.pushSystemLog(
          `自动同步完成：${snap.entity ? snap.entity.name + '，' : ''}新增 ${snap.added} 行、更新 ${snap.updated} 行、失败 ${snap.failed} 项`,
          snap.failed > 0 ? 'warn' : 'success'
        );
      }
    } catch (e) {
      logs.pushSystemLog(`自动同步失败：${e.message || e}`, 'error');
    } finally {
      running = false;
    }
  }

  const timer = setInterval(() => { tick().catch(() => {}); }, 60 * 1000);
  timer.unref();

  return {
    /** 立即执行一次检查（供测试/手动触发） */
    tickNow: tick,
    stop: () => clearInterval(timer),
  };
}

module.exports = { createAutoSyncService };