// timePointUtils.js
class TimePointUtils {
  constructor() {
    this.timePoints = this.generateTimePoints();
  }

  // 生成时间点数组,格式如下：[{"HHmm":"0000","package":0},{"HHmm":"0005","package":1},{"HHmm":"0010","package":2},...]
  generateTimePoints() {
    const points = [];
    for (let hour = 0; hour < 24; hour++) {
      for (let minute = 0; minute < 60; minute += 5) {
        const hh = hour.toString().padStart(2, '0');
        const mm = minute.toString().padStart(2, '0');
        const packageNum = hour * 12 + minute / 5;
        points.push({
          HHmm: hh + mm,
          package: packageNum
        });
      }
    }
    return points;
  }

  // 通过HHmm获取package编号
  getPackageByHHmm(hhmm) {
    if (!/^([0-1][0-9]|2[0-3])([0-5][0-9])$/.test(hhmm)) {
      console.error('Invalid HHmm format, should be like "0000", "2355"');
      return null;
    }
    
    const point = this.timePoints.find(item => item.HHmm === hhmm);
    return point ? point.package : null;
  }

  // 通过package编号获取HHmm
  getHHmmByPackage(packageNum) {
    if (packageNum < 0 || packageNum > 287 || !Number.isInteger(packageNum)) {
      console.error('Invalid package number, should be integer between 0 and 287');
      return null;
    }
    
    const point = this.timePoints.find(item => item.package === packageNum);
    return point ? point.HHmm : null;
  }

  /**
   * 从yyyy-MM-dd-HH-mm格式的时间字符串中提取HHmm部分
   * @param {string} datetime - 格式为"yyyy-MM-dd-HH-mm"的时间字符串，例如"2025-06-27-10-40"
   * @returns {string} 返回HHmm格式的时间字符串，例如"1040"
   */
  getHHmmFromDateTime(datetime) {
    // 验证输入格式
    if (!/^\d{4}-\d{2}-\d{2}-\d{2}-\d{2}$/.test(datetime)) {
      console.error('Invalid datetime format, should be "yyyy-MM-dd-HH-mm"');
      return null;
    }

    // 分割字符串获取小时和分钟部分
    const parts = datetime.split('-');
    const hours = parts[3]; // 小时部分
    const minutes = parts[4]; // 分钟部分

    // 组合成HHmm格式
    return hours + minutes;
  }

}
// 导出单例
const timePointUtils = new TimePointUtils();
export default timePointUtils;