// Copyright (c) 2015, Emir Pasic. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

import (
	"cmp"

	"github.com/emirpasic/gods/v2/trees/binaryheap"
)

// BinaryHeapExample to demonstrate basic usage of BinaryHeap
func main() {

	// Min-heap
	heap := binaryheap.New[int]() // empty (min-heap)
	heap.Push(2)                  // 2
	heap.Push(3)                  // 2, 3
	heap.Push(1)                  // 1, 3, 2
	heap.Values()                 // 1, 3, 2
	_, _ = heap.Peek()            // 1,true
	_, _ = heap.Pop()             // 1, true
	_, _ = heap.Pop()             // 2, true
	_, _ = heap.Pop()             // 3, true
	_, _ = heap.Pop()             // nil, false (nothing to pop)
	heap.Push(1)                  // 1
	heap.Clear()                  // empty
	heap.Empty()                  // true
	heap.Size()                   // 0

	// Max-heap
	inverseIntComparator := func(a, b int) int {
		return -cmp.Compare(a, b)
	}
	heap = binaryheap.NewWith(inverseIntComparator) // empty (min-heap)
	heap.Push(2)                                    // 2
	heap.Push(3)                                    // 3, 2
	heap.Push(1)                                    // 3, 2, 1
	heap.Values()                                   // 3, 2, 1
}