// Package cftp provides functionality.
package cftp

import (
	"bufio"
	"errors"
	"net"
	"strings"
	"time"

	"rocketgit.ru/rsmon/worker/app/models"
)

const stateERR = "ERR"

// Perform provides functionality.
func Perform(c *models.Check) *Result {
	result := &Result{}
	host := c.GetSettings().Port
	if host == "" {
		host = "21"
	}
	result.State = "START"
	client := &net.Dialer{
		Timeout:   10 * time.Second,
		DualStack: true,
	}
	start := time.Now()
	conn, err := client.Dial("tcp", net.JoinHostPort(c.Monitor.Host, host))
	if err != nil {
		result.State = stateERR
		result.Error = err
		result.Duration = time.Since(start)
		return result
	}
	result.Duration = time.Since(start)
	status, err := bufio.NewReader(conn).ReadString('\n')
	if err != nil {
		result.State = stateERR
		result.Error = err
		return result
	}
	if strings.Contains(status, "FTP") {
		result.State = "OK"
	} else {
		result.State = stateERR
		result.Error = errors.New("it's not FTP")
	}
	return result
}