package profile

import (
	"context"
	"demo/deliver"
	"fmt"
	"os"
	"time"
)

func shmrecver(ctx context.Context, c deliver.Deliver, index int, ch chan<- bool) {

	var msg []byte
	var err error

	var t int64
	var elapse int64
	count := 0

	for {
		select {
		case <-ctx.Done():
			return
		default:
			msg, err = c.Recv()
			if err != nil {
				c.Close()
				url := "hello"
				i, err := deliver.NewClientWithError(deliver.Shm, url)
				for {
					if err == nil {
						break
					}
					time.Sleep(1 * time.Second)
					i, err = deliver.NewClientWithError(deliver.Shm, url)

					fmt.Println("client create failed : ", err)

				}
				c = i

				fmt.Println("recv error : ", err)
				continue
			}
			if ch != nil {
				ch <- true
			}

			if t == 0 {
				t = time.Now().UnixNano()
			}
			elapse = time.Now().UnixNano() - t

			count++

			if elapse > 1e9 {
				fmt.Printf("NODE-%d: RECEIVED \"%d\" data %s len %d, use \"%d\" ns\n",
					index, count, string(msg), len(msg), elapse)
				elapse = 0
				count = 0
				t = 0
			}
		}

		// time.Sleep(10 * time.Millisecond)
	}

}

func Shmrecv(ctx context.Context, server bool, ipc string, count int) {
	blocks := 2

	if server {
		s, err := deliver.NewServerWithError(deliver.Shm, ipc, blocks, dLen)
		for {
			if err == nil {
				break
			}
			time.Sleep(1 * time.Second)
			s, err = deliver.NewServerWithError(deliver.Shm, ipc, blocks, dLen)
		}
		go shmrecver(ctx, s, 0, nil)

	} else {
		recvers(ctx, ipc, count, nil)

		return

		chWaiter := make(chan bool, count)
		cs := recvers(ctx, ipc, count, chWaiter)

		go func() {
			waitCount := 0
			for {
				select {
				case <-ctx.Done():
					return
				case <-chWaiter:
					waitCount = 0
				default:
					if waitCount > 200*3 {
						for _, v := range cs {
							v.Close()
						}
						// cs = recvers(ctx, ipc, count, chWaiter)
						// fmt.Println("restart recievers")
						// waitCount = 0
						// continue
					}
					time.Sleep(time.Millisecond * 5)
					waitCount++
				}
			}
		}()
	}
}

func recvers(ctx context.Context, url string, count int, ch chan<- bool) []deliver.Deliver {
	for {
		file := "/dev/shm/" + url
		exist, _ := pathExists(file)
		if exist {
			break
		}
		fmt.Println("wait for shm server start")
		time.Sleep(time.Second)
	}
	var cs []deliver.Deliver
	for i := 0; i < count; i++ {
		c, err := deliver.NewClientWithError(deliver.Shm, url)
		for {
			if err == nil {
				break
			}
			time.Sleep(1 * time.Second)
			c, err = deliver.NewClientWithError(deliver.Shm, url)
			fmt.Println(i, " client create failed : ", err)
		}
		cs = append(cs, c)
		go shmrecver(ctx, c, i, ch)
	}
	return cs
}

func pathExists(path string) (bool, error) {
	_, err := os.Stat(path)
	if err == nil {
		return true, nil
	}
	if os.IsNotExist(err) {
		return false, nil
	}
	return false, err
}