class Bucket {
  constructor({ capacity, volume = 0 }) {
    this.capacity = capacity
    this.volume = volume
  }

  fill() {
    this.volume = this.capacity
  }

  empty() {
    this.volume = 0
  }

  isEmpty() {
    return this.volume === 0
  }

  isFull() {
    return this.volume == this.capacity
  }

  pour(bucket) {
    const availableVolume = bucket.capacity - bucket.volume
    if (availableVolume > this.volume) {
      bucket.volume += this.volume
      this.volume = 0
    } else {
      this.volume -= availableVolume
      bucket.volume += availableVolume
    }
  }

  string() {
    return `${this.volume}vol/${this.capacity}cap`
  }
}

module.exports = Bucket;