package main

import (
	"fmt"
	"math/rand"
	"sync"
	"time"
)

//使用 goroutine 和 channel 实现一个计算int64随机数各位数和的程序，例如生成随机数61345，计算其每个位数上的数字之和为19。
//开启一个 goroutine 循环生成int64类型的随机数，发送到jobChan
//开启24个 goroutine 从jobChan中取出随机数计算各位数的和，将结果发送到resultChan
//主 goroutine 从resultChan取出结果并打印到终端输出

var w sync.WaitGroup

type job struct {
	value int64
}
type Result struct {
	job *job
	sum int64
}

var jobChan = make(chan *job, 100)
var resultChan = make(chan *Result, 100)

func producer(prod chan<- *job) <-chan *job {
	defer w.Done()
	for {
		x := rand.Int63()
		newJob := &job{value: x}
		jobChan <- newJob
		time.Sleep(time.Millisecond * 500)
	}
}

func consumer(con chan<- *Result, prod <-chan *job) {
	defer w.Done()
	for {
		v := <-prod
		sum := int64(0)
		n := v.value
		for n > 0 {
			sum += n % 10
			n = n / 10
		}
		newResult := &Result{job: v, sum: sum}
		con <- newResult
	}
}

func main() {
	w.Add(1)
	go producer(jobChan)
	w.Add(24)
	for i := 0; i < 24; i++ {
		go consumer(resultChan, jobChan)
	}
	for i := range resultChan {
		fmt.Printf("随机数为：%d,加和为:%d\n", i.job.value, i.sum)
	}
	w.Wait()

}