/**
 * 定时任务调度器：应用运行期间每 15s 巡检一次。
 * - 有 cron：按 5 段表达式（本地时区）命中当前分钟则跑
 * - 无 cron：按 intervalMinutes
 * 执行走同一 runTestCase（trigger = schedule），并写入 schedule.runLog。
 */
import { scheduleIsDue } from "@opsxapi/core";
import { runTestCase } from "./testRunner";
import { useWorkspace } from "./workspaceStore";

const TICK_MS = 15_000;
let timer: ReturnType<typeof setInterval> | null = null;
let running = new Set<string>();

function appendLog(caseId: string, ok: boolean, message: string): void {
  const { schedules, upsertSchedule } = useWorkspace.getState();
  const sc = schedules.find((s) => s.caseId === caseId);
  if (!sc) return;
  const entry = { at: Date.now(), ok, message };
  const runLog = [entry, ...(sc.runLog ?? [])].slice(0, 30);
  upsertSchedule(caseId, { runLog });
  const line = `[OpsxAPI 定时] ${new Date(entry.at).toLocaleString("zh-CN")} case=${caseId} ${ok ? "OK" : "FAIL"} ${message}`;
  if (ok) console.info(line);
  else console.warn(line);
}

function tick(): void {
  const now = new Date();
  const { schedules } = useWorkspace.getState();
  for (const s of schedules) {
    if (!s.enabled) continue;
    if (!scheduleIsDue(s, now)) continue;
    if (running.has(s.caseId)) continue;
    running = new Set([...running, s.caseId]);
    const label = s.cron?.trim() ? `cron ${s.cron}` : `every ${s.intervalMinutes}m`;
    void runTestCase(s.caseId, "schedule")
      .then((run) => {
        if (!run) {
          appendLog(s.caseId, false, `${label} · 用例不存在`);
          return;
        }
        appendLog(s.caseId, run.passed, `${label} · ${run.passed ? "通过" : "失败"} · ${run.totalMs}ms`);
      })
      .catch((e) => {
        appendLog(s.caseId, false, `${label} · ${e instanceof Error ? e.message : String(e)}`);
      })
      .finally(() => {
        running = new Set([...running].filter((id) => id !== s.caseId));
      });
  }
}

export function startScheduler(): void {
  if (timer) return;
  timer = setInterval(tick, TICK_MS);
  // 启动后立刻巡检一次，避免干等
  tick();
}

export function stopScheduler(): void {
  if (timer) clearInterval(timer);
  timer = null;
}

/** 供 UI 显示：下次预计运行时间（仅 interval 模式有意义；cron 返回下一分钟近似） */
export function nextRunAt(intervalMinutes: number, lastRunAt: number | null, cron?: string | null): number {
  if (cron?.trim()) {
    // 粗略：下一分钟整点再由表达式过滤；UI 仅作提示
    return Date.now() + 60_000;
  }
  const intervalMs = Math.max(1, intervalMinutes) * 60_000;
  return (lastRunAt ?? Date.now() - intervalMs) + intervalMs;
}