package cwhois

import (
	"net"
	"strings"
	"time"

	"github.com/glebtv/whois"
	"github.com/weppos/publicsuffix-go/publicsuffix"

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

// Perform provides functionality.
func Perform(c *models.Check) *Result {
	result := &Result{}
	result.State = "FAIL"
	host := c.Monitor.Host

	if host == "localhost" || strings.HasPrefix(host, "localhost:") {
		result.Warnings = append(result.Warnings, "WHOIS check not possible for localhost, please disable")
		return result
	}

	addr := net.ParseIP(host)
	if addr != nil {
		result.Warnings = append(result.Warnings, "WHOIS check not possible for ip address, please disable")
		return result
	}

	zname, err := publicsuffix.Domain(host)
	if err != nil {
		result.Warnings = append(result.Warnings, "Failed to get public suffix: "+err.Error())
		zname = host
	}
	if zname != host {
		result.Infos = append(result.Infos, "not top level domain, running WHOIS check for "+zname)
	}

	start := time.Now()
	response := whois.Whois(zname)
	result.Raw = *response
	result.Error = result.Raw.Error
	if result.Error == nil {
		result.State = "OK"
	}
	result.Duration = time.Since(start)

	if result.Error != nil {
		result.State = "ERR"
	}

	if response.Expires.IsZero() {
		if result.State == "OK" {
			result.State = "WARN"
		}
		result.Warnings = append(result.Warnings, "unable to get whois expiration for "+host)
		return result
	}
	result.Expires = &response.Expires
	exp := time.Until(*result.Expires).Hours() / 24

	if exp < 3 {
		result.State = "WARN"
		result.Warnings = append(result.Warnings, "Domain expires in a few days")
	}

	return result
}