package checker

import (
	"crypto/tls"
	"fmt"
	"math"
	"strings"
	"time"
)

func FormatDomain(domain string) string {
	elements := strings.Split(domain, ":")

	if len(elements) == 1 {
		return fmt.Sprintf("%s:443", elements[0])
	}

	return domain
}

func CheckCertificate(domain string) Domain {
	now := time.Now()
	conn, err := tls.Dial("tcp", FormatDomain(domain), nil)

	if err == nil {
		date := conn.ConnectionState().PeerCertificates[0].NotAfter
		daysLeft := date.Sub(now).Hours() / 24

		return Domain{
			Name:     domain,
			DaysLeft: math.Floor(daysLeft),
			Date:     date.Format(time.DateTime),
		}
	}

	return Domain{Name: domain, Failed: true}
}

func CheckCertificates(domains []string) []Domain {
	values := []Domain{}

	for _, domain := range domains {
		values = append(values, CheckCertificate(domain))
	}

	return values
}