package service

import (
	"context"
	"log/slog"
	"time"

	"git.lzcwy.cn/zhengchiliu/zt-closet-backend/global"
	"git.lzcwy.cn/zhengchiliu/zt-closet-backend/internal/mysqldao"
)

// StartOrderExpireScheduler 启动订单超时过期定时任务：每分钟将超时未支付订单批量置为已过期。
func StartOrderExpireScheduler() {
	go func() {
		slog.Info("order expire scheduler started")
		for {
			func() {
				defer func() {
					if r := recover(); r != nil {
						slog.Error("order expire scheduler panic", "recover", r)
					}
				}()
				runOrderExpire()
			}()
			time.Sleep(time.Minute)
		}
	}()
}

// runOrderExpire 扫描并过期超时待支付订单。条件更新天然幂等，多实例并发无害，无需分布式锁。
func runOrderExpire() {
	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
	defer cancel()

	ctx, span := global.Tracer.Start(ctx, "scheduler.OrderExpire")
	defer span.End()

	affected, err := mysqldao.NewOrderDao().OrderExpireByTime(ctx, nowUnix())
	if err != nil {
		slog.ErrorContext(ctx, "expire orders failed", "error", err)
		return
	}
	if affected > 0 {
		slog.InfoContext(ctx, "expired pending orders", "count", affected)
	}
}