package common

/**

import中必须有git.ikuban.com/server/kratos-utils/common

import (
	"context"
	"fmt"
	"time"

	"git.ikuban.com/server/kratos-utils/common"
)

func main() {
	test()
	go test()
	common.GlobalWaitGroup.Stop()
}

func test() {
	ok := common.GlobalWaitGroup.Add(1)
	if !ok {
		return
	}
	common.GlobalWaitGroup.SetTimeout(time.Now().Unix() + 12)
	go func() {
		fmt.Println("任务开始")
		time.Sleep(time.Second * 11)
		fmt.Println("任务完成")
		common.GlobalWaitGroup.Done()
	}()
}


*/

import (
	"fmt"
	"sync"
	"sync/atomic"
	"time"
)

var GlobalWaitGroup *globalWaitGroup

func init() {
	GlobalWaitGroup = NewGlobalWaitGroup()
}

type globalWaitGroup struct {
	wg       sync.WaitGroup
	timeout  int64 //超时时间， 时间戳
	isStop   bool
	lock     sync.Mutex
	ok       chan bool
	num      int64
	taskMap  sync.Map
	taskLock sync.Mutex
}

func NewGlobalWaitGroup() *globalWaitGroup {
	this := &globalWaitGroup{
		wg:     sync.WaitGroup{},
		isStop: false,
		ok:     make(chan bool, 1),
	}

	return this
}

func (this *globalWaitGroup) Stop() {
	this.isStop = true
	this.Wait()
}

func (this *globalWaitGroup) Wait() {
	go func() {
		this.wait()
	}()
	diff := this.timeout - time.Now().Unix()
	if diff <= 0 {
		diff = 10
	}
	select {
	case <-this.ok:
		fmt.Println("全局waitgroup,无任务结束")
		return
	case <-time.After(time.Second * time.Duration(diff)):
		text := fmt.Sprintf("全局waitgroup,超时结束,正在执行任务数:%d个,", this.num)
		if this.num > 0 {
			text = text + "["
		}
		this.taskMap.Range(func(key, value interface{}) bool {
			task := fmt.Sprintf("\"task_name:%s,num:%d\"", key, value.(int64))
			text = text + task + ","
			return true
		})
		text = text[:len(text)-1] + "]"
		fmt.Println(text)
		return
	}
}

func (this *globalWaitGroup) wait() {
	this.wg.Wait()
	this.ok <- true
}

func (this *globalWaitGroup) Done(taskName string) {
	this.wg.Done()
	atomic.AddInt64(&this.num, -1)
	num, ok := this.taskMap.Load(taskName)
	if !ok {
		return
	}
	if num.(int64) <= 1 {
		this.taskMap.Delete(taskName)
	}
	this.taskMap.Store(taskName, num.(int64)-1)
}

func (this *globalWaitGroup) SetTimeout(timeout time.Time) {
	if timeout.Unix() <= 0 {
		return
	}
	this.lock.Lock()
	if this.timeout < timeout.Unix() {
		this.timeout = timeout.Unix()
	}
	this.lock.Unlock()
}

func (this *globalWaitGroup) Add(taskName string, delta int) bool {
	if this.isStop {
		fmt.Println("已结束,不能在添加任务")
		return false
	}
	num, ok := this.taskMap.Load(taskName)
	if ok {
		this.taskMap.Store(taskName, num.(int64)+1)
	} else {
		this.taskMap.Store(taskName, int64(1))
	}
	this.wg.Add(delta)
	atomic.AddInt64(&this.num, 1)
	return true
}