// ------------------------------------------------------------------------
//   Project active2
//   Active Thing (activething.com) git.activething.com/go
//
//   File name  g_queue.go
//   Created by DEV
//   Modified   24/04/2024
//
//   Copyright 2024 activething.com 
// ------------------------------------------------------------------------
// 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 queue

import (
	"sync"
	"syns"
)

type (

	GQueue 	[T any]struct {
		locker syns.LockerRW
		elems  []T
	}

)


func NewGQueue [T any](safe bool) *GQueue[T] {
	var lc syns.LockerRW
	if safe {
		lc = &sync.RWMutex{}
	} else {
		lc = syns.NopLocker{}
	}
	return &GQueue[T]{ locker : lc }
}


func (q *GQueue[T]) Len () (l int) {
	q.locker.RLock()
	l = len(q.elems)
	q.locker.RUnlock()
	return
}


func (q *GQueue[T]) Push(ele T) {
	q.locker.Lock()
	q.elems = append(q.elems,ele)
	q.locker.Unlock()
}


func (q *GQueue[T]) Pop() (e T) {
	q.locker.Lock()
	if q.Len() > 0 {
		e = q.elems[0]
		q.elems = q.elems[1:]
	}
	q.locker.Unlock()
	return
}


func (q *GQueue[T]) Clear (onClearFnc func(ele T)) {
	q.locker.Lock()
	if onClearFnc != nil {
		for _,e := range q.elems {
			onClearFnc(e)
		}
	}
	q.elems = q.elems[:0]
	q.locker.Unlock()
}