import { TheoryBeats } from "../beats/TheoryBeats";
import { TheoryParse } from "../parse/TheoryParse";
import { TheoryCheck } from "../../util/TheoryCheck";

export class TheoryMeasure {
  private _measureOnsetArray: number[];
  private _measureLength: number;
  private _parse: TheoryParse;
  public constructor(parse_: TheoryParse) {
    this._parse = parse_;
  }

  public getMeasureOnset(Beats_: TheoryBeats) {
    if (TheoryCheck.isNullOrUndefined(this._measureOnsetArray)) {
      this._measureOnsetArray = [];
      let measureDuration = this._parse.getMeasureBackupDuration();
      let eachMeasureOnset = 0;
      for (let i = 0; i < measureDuration.length; i++) {
        this._measureOnsetArray.push(eachMeasureOnset);
        eachMeasureOnset += (measureDuration[i] / this._parse.getDivisions()) * Beats_.unit4Beats;
      }
    }
    return this._measureOnsetArray;
  }

  /**
   * 获取所有小节个数
   */
  public getMeasureListLength(): number {
    if (TheoryCheck.isNullOrUndefined(this._measureLength)) {
      this._measureLength = this._parse.getMeasures.length;
    }
    return this._measureLength;
  }
}