// Copyright (c) 2026 Probo Inc <hello@probo.com>.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package cookiebanner

import (
	"encoding/json"
	"fmt"
	"reflect"
)

// ptrEqual reports whether two nullable values are equal: both nil are equal,
// one nil is not equal to a non-nil, otherwise the pointed-to values are
// compared with ==.
func ptrEqual[T comparable](a, b *T) bool {
	if a == nil || b == nil {
		return a == b
	}

	return *a == *b
}

// jsonEqual reports whether two JSON blobs are semantically identical after
// normalising whitespace and key ordering. Array element order is preserved
// as significant.
func jsonEqual(a, b json.RawMessage) (bool, error) {
	var av, bv any
	if err := json.Unmarshal(a, &av); err != nil {
		return false, fmt.Errorf("cannot unmarshal first json blob: %w", err)
	}

	if err := json.Unmarshal(b, &bv); err != nil {
		return false, fmt.Errorf("cannot unmarshal second json blob: %w", err)
	}

	return reflect.DeepEqual(av, bv), nil
}