package fs

import (
	"os"
)

type MailFileRequest struct {
	respCh chan MailFile
}

func NewMailFileRequest() MailFileRequest {
	ch := make(chan MailFile)
	return MailFileRequest{respCh: ch}
}

func (r MailFileRequest) Response() MailFile {
	return <-r.respCh
}

func NewOracle() chan MailFileRequest {
	r := realClock{}
	return newOracle(r)
}

func newOracle(c clock) chan MailFileRequest {
	reqCh := make(chan MailFileRequest, 10)
	go spawnOracle(reqCh, c)
	return reqCh
}

func spawnOracle(reqCh <-chan MailFileRequest, c clock) {
	count := 0
	C := c.Ticker().getC()
	pid := os.Getpid()
	hostname, err := os.Hostname()
	if err != nil {
		hostname = "MISSING"
	}
	for {
		select {
		case <-C:
			count = 0
		case req := <-reqCh:
			req.respCh <- MailFile{
				timestamp:   c.Now(),
				progressive: count,
				pid:         pid,
				hostname:    hostname,
			}
			count += 1
		}
	}
}