"use strict";

/**
 * 巡检报告定时调度器
 *
 * 和 inspectionScheduler.cjs **物理隔离**：
 *   - 独立 tick 循环（1min）
 *   - 独立配置存储（reportScheduleStore）
 *   - 独立触发路径（调 index.cjs 里 runReportSnapshot 的实现函数）
 *   - 独立日报告聚合（dailyReportStore）
 *
 * 防止重蹈「两个调度器竞争同一巡检任务」的覆辙。
 */

const reportScheduleStore = require("./reportScheduleStore.cjs");
const reportStore = require("./reportStore.cjs");
const dailyReportStore = require("./dailyReportStore.cjs");

let _tickTimer = null;
let _dailyTimer = null;
let _lastDailyTriggerKey = null;   // 用于 HH:MM 日报告每日只触发一次
let _inProgress = false;           // 快照执行中锁 —— 防止执行时间 >60s 时被下一个 tick 重入

/**
 * 启动 reportScheduler
 *
 * @param {object} deps
 * @param {function} deps.readStorage
 * @param {function} deps.writeStorage
 * @param {function} deps.runSnapshotFn - 定时快照执行函数（renderer 侧 Hook 实际负责执行，这里传空函数）
 * @param {function} [deps.onDailyReportReady] - 日报告聚合完成后回调 async (report) => void
 */
function start({ readStorage, writeStorage, runSnapshotFn, onDailyReportReady, getAllDeviceIdsFn }) {
  if (_tickTimer) return;  // 已启动

  const readFn = (k) => readStorage(k);
  const writeFn = (k, v) => writeStorage(k, v);
  const _getAllDeviceIds = getAllDeviceIdsFn;

  const tick = async () => {
    const cfg = reportScheduleStore.getSchedule(readFn);
    if (!cfg.enabled) return;

    // 防重入：快照正在执行中就跳过（执行时间 >60s 时下一个 tick 会撞到）
    if (_inProgress) {
      console.log("[reportScheduler] tick: 上一个快照还在执行，跳过");
      return;
    }

    const now = Date.now();
    const intervalMs = (cfg.defaultIntervalHours || 1) * 3600 * 1000;
    const lastRun = cfg.lastRunAt || 0;
    const sinceLast = now - lastRun;

    // 还没到间隔就跳过
    if (lastRun > 0 && sinceLast < intervalMs) {
      const remainingMin = ((intervalMs - sinceLast) / 60000).toFixed(1);
      console.log(`[reportScheduler] tick: 未到间隔，还需 ${remainingMin} 分钟`);
      return;
    }

    // null/undefined = 全部；空数组 = 不巡检；非空数组 = 指定设备
    let deviceIds = cfg.enabledDeviceIds;
    if (deviceIds === null || deviceIds === undefined) {
      // 全部设备 —— 通过回调拿（由调用方注入，避免依赖不存在的 deviceStore.listDevices）
      if (typeof _getAllDeviceIds === "function") {
        deviceIds = _getAllDeviceIds();
      } else {
        console.error("[reportScheduler] ❌ 无 getAllDeviceIds 回调，跳过");
        return;
      }
    } else if (Array.isArray(deviceIds) && deviceIds.length === 0) {
      console.log("[reportScheduler] tick: enabledDeviceIds=[], 跳过（不巡检任何设备）");
      return;
    }

    // 过滤掉 isDeviceEnabled=false 的（disabled 状态）
    const enabledDeviceIds = (deviceIds || []).filter(id =>
      reportScheduleStore.isDeviceEnabled(readFn, id)
    );

    if (enabledDeviceIds.length === 0) {
      console.log("[reportScheduler] tick: 0 台设备启用，跳过");
      return;
    }

    console.log(`[reportScheduler] tick: 到点，${enabledDeviceIds.length} 台设备，interval=${cfg.defaultIntervalHours}h，距上次 ${(sinceLast/60000).toFixed(1)} 分钟`);
    _inProgress = true;
    try {
      await runSnapshotFn(enabledDeviceIds, "scheduled");
      // 持久化 lastRunAt —— 重启 Electron 也知道上次什么时候跑的
      const merged = { ...cfg, lastRunAt: now };
      reportScheduleStore.saveSchedule(writeFn, merged);
      console.log("[reportScheduler] ✅ 快照完成，lastRunAt 已持久化");
    } catch (e) {
      console.error("[reportScheduler] runSnapshot 失败:", e?.message || String(e));
    } finally {
      _inProgress = false;
    }
  };

  // 启动后等 60s tick 自动处理第一次（不立即触发，避免重启爆发）
  const curCfg = reportScheduleStore.getSchedule(readFn);
  console.log("[reportScheduler] 已启动，间隔", (curCfg.defaultIntervalHours || 1), "h，下次 tick 检查在 60s 后");

  // 每 60 秒 tick 一次
  _tickTimer = setInterval(() => { tick().catch(e => console.error("[reportScheduler] tick 异常:", e)); }, 60 * 1000);
  _tickTimer.unref?.();

  // 每秒检查是否到 dailyReportTime（HH:MM 精确匹配，每日只触发一次）
  const dailyCheck = () => {
    const cfg = reportScheduleStore.getSchedule(readFn);
    if (!cfg.enabled) return;
    const now = new Date();
    const p = (n) => n.toString().padStart(2, "0");
    const current = `${p(now.getHours())}:${p(now.getMinutes())}`;
    const key = `${now.getFullYear()}-${p(now.getMonth() + 1)}-${p(now.getDate())}`;

    if (current === cfg.dailyReportTime && _lastDailyTriggerKey !== key) {
      _lastDailyTriggerKey = key;
      console.log("[reportScheduler] 触发日运行报告:", key);
      triggerDailyReport(readFn, writeFn, { mode: "finalized", trigger: "scheduled" })
        .then(report => {
          if (onDailyReportReady) {
            onDailyReportReady(report).catch(e =>
              console.error("[reportScheduler] onDailyReportReady 异常:", e?.message || String(e))
            );
          }
        })
        .catch(e => console.error("[reportScheduler] 日报告生成异常:", e));
    }
  };
  _dailyTimer = setInterval(dailyCheck, 30 * 1000);
  _dailyTimer.unref?.();
}

function stop() {
  if (_tickTimer) { clearInterval(_tickTimer); _tickTimer = null; }
  if (_dailyTimer) { clearInterval(_dailyTimer); _dailyTimer = null; }
  console.log("[reportScheduler] 已停止");
}

function isRunning() {
  return !!_tickTimer;
}

/**
 * 手动触发日运行报告（立即执行，不等到 HH:MM）
 * mode: "provisional" — 取当天 0:00 ~ 此刻
 *       "finalized"   — 取当天 0:00 ~ 23:59
 */
async function triggerDailyReport(readFn, writeFn, { mode = "provisional", trigger = "manual" } = {}) {
  const now = Date.now();
  const dayStart = dailyReportStore._dayStart(now);
  const dayEnd = mode === "finalized" ? dailyReportStore._dayEnd(now) : now;

  const allSnapshots = reportStore.listSnapshots(readFn, 1000);
  const report = dailyReportStore.buildDailyReport(allSnapshots, dayStart, dayEnd, { mode, trigger });
  dailyReportStore.addDailyReport(readFn, writeFn, report);
  console.log(`[reportScheduler] 日报告 ${report.id} 已生成 (mode=${mode})`);
  return report;
}

module.exports = {
  start,
  stop,
  isRunning,
  triggerDailyReport,
};