package bucket

import "fmt"

// Bucket to store volume
type Bucket struct {
	// Capacity amount the bucket can store
	Capacity uint64
	// Volume is the current volume of the bucket
	Volume uint64
}

// Fill sets the volume to the capacity to fill bucket
func (b *Bucket) Fill() {
	b.Volume = b.Capacity
}

// Empty sets the volume to 0
func (b *Bucket) Empty() {
	b.Volume = 0
}

// Pour fills the target bucket to the top
func (b *Bucket) Pour(target *Bucket) {
	availableVolume := target.Capacity - target.Volume
	if availableVolume > b.Volume {
		target.Volume += b.Volume
		b.Volume = 0
	} else {
		b.Volume -= availableVolume
		target.Volume += availableVolume
	}
}

// String gets string representation
func (b *Bucket) String() string {
	return fmt.Sprintf("%dvol/%dcap", b.Volume, b.Capacity)
}