package amclient

import (
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"net/url"
	"time"
)

type Client struct {
	reportURL string
}

// addr is the full address, for example: https://x.io/report.
func New(reportURL string) Client {
	return Client{reportURL}
}

func (client Client) post(values url.Values) error {
	cl := http.Client{Timeout: 30 * time.Second}

	resp, err := cl.PostForm(client.reportURL, values)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return err
	}
	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("POST failed: [%d] %s", resp.StatusCode, body)
	}
	return nil
}

func (cl Client) Ping() error {
	if cl.reportURL == "" {
		log.Printf("AM ping")
		return nil
	}
	return cl.post(url.Values{
		"action": []string{"ping"},
	})
}

func (cl Client) Log(text string, args ...interface{}) error {
	text = fmt.Sprintf(text, args...)
	if cl.reportURL == "" {
		log.Printf("AM log: %s", text)
		return nil
	}
	return cl.post(url.Values{
		"action": []string{"log"},
		"text":   []string{text},
	})
}

func (cl Client) Alert(text string, args ...interface{}) error {
	text = fmt.Sprintf(text, args...)
	if cl.reportURL == "" {
		log.Printf("AM alert: %s", text)
		return nil
	}
	return cl.post(url.Values{
		"action": []string{"alert"},
		"text":   []string{text},
	})
}