package engine

import (
	"context"
	"log"
	"strconv"
	"time"
)

type FirstEngine struct {
	Scheduler Scheduler
	WorkCount int
	Work      func(request Request) (Response, error)
}

type Scheduler interface {
	Submit(request Request)
	ConfigChan() chan Request
	Run()
	WorkReady(chan Request)
}

var ctx context.Context

func (e *FirstEngine) CreateWorker(in chan Request, out chan Response) {
	go func() {
		for {
			e.Scheduler.WorkReady(in)
			req := <-in
			work, err := e.Work(req)
			if err != nil {
				log.Printf("work:%v err: %v", req, err)
				//出错之后让其他线程重新调度
				e.Scheduler.Submit(req)
			} else {
				out <- work
			}
		}
	}()
}

func (e *FirstEngine) Run(num int) {
	out := make(chan Response)

	e.Scheduler.Run()

	start := time.Now()
	for i := 0; i < e.WorkCount; i++ {
		e.CreateWorker(e.Scheduler.ConfigChan(), out)
	}

	log.Printf("time slice 1: %d", time.Since(start)/time.Millisecond)
	for i := 0; i < num; i++ {
		e.Scheduler.Submit(Request{Id: strconv.Itoa(i), Dlock: "redis_lock"})
	}

	log.Printf("time slice 2: %d", time.Since(start)/time.Millisecond)
	i := 0
	for id := range out {
		i++
		log.Println(id.Id)
		if i >= num {
			close(out)
		}
	}

	log.Printf("time slice 3: %d", time.Since(start)/time.Millisecond)
}