package service

import (
	"fmt"
	"net/http"
	"strings"
	"time"

	"git.links123.net/links123.com/monitor_status/config"
	"git.links123.net/links123.com/monitor_status/service/notice"
	"git.links123.net/links123.com/monitor_status/service/store/cache"
)

var httpClient = &http.Client{
	Timeout: 10 * time.Second,
}

func Monitor() error {
	urls := strings.Split(config.C.Monitor.URLs, ";")
	for {
		monitorStep(urls)

		time.Sleep(10 * time.Second) //10s 间隔
	}
	return nil
}

func monitorStep(urls []string) {
	for _, url := range urls {
		err := monitorURL(url)
		if cache.CheckMonitor(url, err) {
			if err != nil {
				notice.SendEmailBySMTP("url error", config.C.Notice.Emails, err.Error(), false)
			} else {
				notice.SendEmailBySMTP("url return ok", config.C.Notice.Emails, "return ok", false)
			}
		}
	}
}

func monitorURL(url string) error {
	startTime := time.Now()
	resp, err := httpClient.Get(url)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("status code:%d url:%s", resp.StatusCode, url)
	}
	useTime := int64(time.Now().Sub(startTime) / time.Millisecond)
	if useTime > config.C.Monitor.Timeout {
		return fmt.Errorf("timeout url:%s,millisecond:%d", url, useTime)
	}
	return nil
}