package utils

import (
	"errors"
	"strings"
	"time"
)

const issuedAtLayout = "02/01/2006, 15:04:05"

var knownDateFormats = []string{
	"02.01.2006", // 21.01.2026
	"02.01.06",   // 21.01.2026
	"02-01-2006", // 21-01-2026
	"02/01/2006", // 21/01/2026
	"2006/01/02", // 2026/01/21
	"2006-01-02", // 2026-01-21
	"2006.01.02", // 2026.01.21
}

func NormalizeDateToISO(input string) (string, error) {
	input = strings.TrimSpace(input)
	for _, layout := range knownDateFormats {
		if t, err := time.Parse(layout, input); err == nil {
			return t.Format("2006-01-02"), nil
		}
	}

	return "", errors.New("unsupported date format")
}

func ParseIssuedAt(value string) (time.Time, error) {
	return time.Parse(issuedAtLayout, value)
}