// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.

package coinpayments

import (
	"net/url"

	"github.com/zeebo/errs"
)

// ErrNoAuthorizationKey is error that indicates that there is no authorization key.
var ErrNoAuthorizationKey = Error.New("no authorization key")

// GetTransactionKeyFromURL parses provided raw url string
// and extracts authorization key from it. Returns ErrNoAuthorizationKey if
// there is no authorization key and error if rawurl cannot be parsed.
func GetTransactionKeyFromURL(rawurl string) (string, error) {
	u, err := url.Parse(rawurl)
	if err != nil {
		return "", errs.Wrap(err)
	}

	key := u.Query().Get("key")
	if key == "" {
		return "", ErrNoAuthorizationKey
	}

	return key, nil
}

// GetCheckoutURL constructs checkout url from auth key and transaction id.
func GetCheckoutURL(key string, id TransactionID) string {
	u, _ := url.Parse("https://coinpayments.net/index.php")

	query := u.Query()
	query.Add("cmd", "checkout")
	query.Add("id", id.String())
	query.Add("key", key)

	u.RawQuery = query.Encode()
	return u.String()
}