export enum DateFormat {
  CHINA = '年月日',
  UNDERLINE = '-',
  FULL_STOP = '.',
}

export class YTDateUtil {
  private static timestampCache = new Map<string, number>();

  // 格式化日期  xx月xx日
  static formatMonth(date: Date): string {
    return `${YTDateUtil.padNumber(date.getMonth() + 1)}月${YTDateUtil.padNumber(date.getDate())}日`
  }
  // 格式化日期  yyyy年xx月xx日
  static formatDate(date: Date, format: DateFormat = DateFormat.CHINA): string {
    if (format == DateFormat.CHINA) {
      return `${date.getFullYear()}年${YTDateUtil.padNumber(date.getMonth() + 1)}月${YTDateUtil.padNumber(date.getDate())}日`
    }
    return `${date.getFullYear()}${format}${YTDateUtil.padNumber(date.getMonth() + 1)}${format}${YTDateUtil.padNumber(date.getDate())}`
  }

  /*   static  formatDate(date: Date): string {
      return `${date.getFullYear()}年${date.getMonth() + 1}月`
    }*/

  // 组合格式化（如：周二 00:00:00）
  static formatFull(date: Date): string {
    return `${YTDateUtil.getWeekCN(date)} ${date.toTimeString().slice(0, 8)}`
  }

  // 获取中文星期几
  static getWeekCN(date: Date): string {
    const week = ['周日', '周一', '周二', '周三', '周四', '周五', '周六']
    return week[date.getDay()]
  }

  // 补零工具方法
  static padNumber(num: number): string {
    return num.toString().padStart(2, '0');
  }


  static SATURDAY = 6; // 日历表上周六对应的序列号，从周日开始算起，取值0~6

  /*
   * 根据指定年份和月份获取该月在日历表上的日期排布数据
   * @param {number} specifiedMonth - 指定月份
   * @param {number} specifiedYear - 指定年份
   */
  static getMonthDate(specifiedMonth: number, specifiedYear: number) {
    let currentFirstWeekDay: number = 0; // 初始化指定月的第一天是周几
    let currentLastWeekDay: number = 0; // 初始化指定月的最后一天是周几
    let currentAllDay: number[] = []; // 初始化指定月的日期排列数组
    let totalDays = new Date(specifiedYear, specifiedMonth, 0).getDate(); // 初始化指定月总天数
    currentFirstWeekDay = new Date(specifiedYear, specifiedMonth - 1, 1).getDay(); // 获取指定月的第一天是周几
    currentLastWeekDay = new Date(specifiedYear, specifiedMonth - 1, totalDays).getDay(); // 获取指定月的最后一天是周几
    // 将月份中显示上个月日期的内容置0
    for (let item = 0; item < currentFirstWeekDay; item++) {
      currentAllDay[item] = 0;
    }
    // 将本月日期内容存入数组
    for (let item = 1; item <= totalDays; item++) {
      currentAllDay.push(item);
    }
    // 将月份中显示下个月日期的内容置0
    for (let item = 0; item < YTDateUtil.SATURDAY - currentLastWeekDay; item++) {
      currentAllDay.push(0);
    }
    return currentAllDay;
  }

  // 深拷贝日期对象 并且 将日期对象中的时、分、秒、毫秒归零
  public static normalizeDate(date: Date): Date {
    return new Date(date.getFullYear(), date.getMonth(), date.getDate());
  }

  // 在是否在日期范围内
  public static isDateBetween(target: Date, start: Date, end: Date): boolean {
    const time = target.getTime();
    return time > start.getTime() && time < end.getTime();
  }

  public static isDateBetweenByTimestamp(target: Date, startTime: number, endTime: number): boolean {
    const targetTime = target.getTime();
    return targetTime > startTime && targetTime < endTime;
  }


  static getCachedTime(date: Date): number {
    const key = `${date.getFullYear()}-${date.getMonth()}-${date.getDate()}`;
    if (!YTDateUtil.timestampCache.has(key)) {
      YTDateUtil.timestampCache.set(key, date.getTime());
    }
    return YTDateUtil.timestampCache.get(key)!;
  }


  //计算两个日期的天数差
  static getDaysBetweenDates(startDate: Date, endDate: Date): number {
    const startTime = startDate.getTime();
    const endTime = endDate.getTime();
    const diffTime = Math.abs(endTime - startTime);
    const diffDays =Math.floor(diffTime / (1000 * 3600 * 24)) + 1;
    return diffDays;
  }

  //获取多少年的今天
  static getYearToday(year: number): Date {
    const today = new Date();
    const yearToday = new Date(today.getFullYear() + year, today.getMonth(), today.getDate());
    return yearToday;
  }

}