// Copyright 2024 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package syncx

import "sync"

// Map is a type-safe wrapper around sync.Map.
// It is safe for concurrent use.
// The zero value of Map is an empty map ready to use.
type Map[K comparable, V any] struct {
	m sync.Map
}

func (m *Map[K, V]) Load(key K) (V, bool) {
	v, ok := m.m.Load(key)
	if !ok {
		var empty V
		return empty, false
	}
	return v.(V), true
}

func (m *Map[K, V]) Store(key K, value V) {
	m.m.Store(key, value)
}

func (m *Map[K, V]) Delete(key K) {
	m.m.Delete(key)
}

func (m *Map[K, V]) Range(f func(key K, value V) bool) {
	m.m.Range(func(key, value any) bool {
		return f(key.(K), value.(V))
	})
}

func (m *Map[K, V]) LoadOrStore(key K, value V) (V, bool) {
	v, loaded := m.m.LoadOrStore(key, value)
	return v.(V), loaded
}

func (m *Map[K, V]) LoadAndDelete(key K) (V, bool) {
	v, ok := m.m.LoadAndDelete(key)
	if !ok {
		var empty V
		return empty, false
	}
	return v.(V), true
}

func (m *Map[K, V]) CompareAndSwap(key K, old, new V) bool {
	return m.m.CompareAndSwap(key, old, new)
}

func (m *Map[K, V]) CompareAndDelete(key K, value V) bool {
	return m.m.CompareAndDelete(key, value)
}

func (m *Map[K, V]) Swap(key K, value V) (V, bool) {
	previous, loaded := m.m.Swap(key, value)
	return previous.(V), loaded
}