const EMPTY = "empty"
const FILL = "fill"
const POUR = "pour"
const UNKNOWN = "unknown"

class Action {
  constructor({ kind = UNKNOWN, target, src } = {}) {
    this.kind = kind
    this.target = target
    this.src = src
  }

  isEmpty() {
    return this.kind === EMPTY;
  }

  isFill() {
    return this.kind === FILL;
  }

  isPour() {
    return this.kind === POUR;
  }

  string() {
    if (this.kind === POUR) {
      return `${this.kind} ${this.src} → ${this.target}`
    }
    return `${this.kind} ${this.target}`
  }
}

module.exports = {
  fill(index) {
    return new Action({ kind: FILL, target: index })
  },

  empty(index) {
    return new Action({ kind: EMPTY, target: index })
  },

  pour(src, target) {
    return new Action({ kind: POUR, target, src })
  },
}