export class MDate {

  private _timestamp: string;

  /**
   * @param date Timestamp with format YYYYMMDD
   * @example 20190812
   * */
  constructor(date: number) {
    this._timestamp = date.toString();
  }

  /**
   * @param date Date object
   * @param time Returns timestamp as time, default is date
   * @example Date: Format YYYYMMDD = 20190812, Time: Format HHMMSS = 171401
   * @return number
   * */
  public static getTimestamp(date: Date, time?: boolean): number {
    let timestamp = '';
    if (time) {
      timestamp += `${date.getHours()}`;
      timestamp += date.getMinutes() < 10 ? `0${date.getMinutes()}` : `${date.getMinutes()}`;
      timestamp += date.getSeconds() < 10 ? `0${date.getSeconds()}` : `${date.getSeconds()}`;
      return Number(timestamp);
    } else {
      timestamp += `${date.getFullYear().toString()}`;
      timestamp += (date.getMonth() + 1) < 10 ? `0${(date.getMonth() + 1)}` : `${date.getMonth() + 1}`;
      timestamp += date.getDate() < 10 ? `0${date.getDate()}` : `${date.getDate().toString()}`;
      return Number(timestamp);
    }
  }

  private static getHours(time: string): string {
    return time.slice(0, 2);
  }

  private static getMinutes(time: string): string {
    return time.slice(2, 4);
  }

  private static getSeconds(time: string): string {
    return time.slice(4, time.length);
  }

  private static getWeekDayName(day: number, toLowerCase?: boolean): string {
    switch (day) {
      case 0:
        return toLowerCase ? 'lunes' : 'Lunes';
      case 1:
        return toLowerCase ? 'martes' : 'Martes';
      case 2:
        return toLowerCase ? 'miercoles' : 'Miercoles';
      case 3:
        return toLowerCase ? 'jueves' : 'Jueves';
      case 4:
        return toLowerCase ? 'viernes' : 'Viernes';
      case 5:
        return toLowerCase ? 'sabado' : 'Sabado';
      case 6:
        return toLowerCase ? 'domingo' : 'Domingo';
    }
  }

  private static getMonthName(month: string, toLowerCase?: boolean): string {
    switch (month) {
      case '01':
        return toLowerCase ? 'ene.' : 'Ene.';
      case '02':
        return toLowerCase ? 'feb.' : 'Feb.';
      case '03':
        return toLowerCase ? 'mar.' : 'Mar.';
      case '04':
        return toLowerCase ? 'abr.' : 'Abr.';
      case '05':
        return toLowerCase ? 'may.' : 'May.';
      case '06':
        return toLowerCase ? 'jun.' : 'Jun.';
      case '07':
        return toLowerCase ? 'jul.' : 'Jul.';
      case '08':
        return toLowerCase ? 'ago.' : 'Ago.';
      case '09':
        return toLowerCase ? 'sep.' : 'Sep.';
      case '10':
        return toLowerCase ? 'oct.' : 'Oct.';
      case '11':
        return toLowerCase ? 'nov.' : 'Nov.';
      case '12':
        return toLowerCase ? 'dic.' : 'Dic.';
    }
  }

  /**
   * @param time Timestamp with format HHMMSS
   * @example 171401
   * @return Date
   * Converting timestamp with format YYYYMMDD,
   * if you not assign the time param, the hours, minutes and seconds is a zero
   * */
  public toDate(time?: number): Date {
    if (time) {
      const cDate = `${this.getYear()}-${this.getMoth()}-${this.getDay()}`;
      const cTime = `${MDate.getHours(time.toString())}:${MDate.getMinutes(time.toString())}:${MDate.getSeconds(time.toString())}`;
      const fullCDate = `${cDate}T${cTime}Z`;
      return new Date(fullCDate);
    } else {
      return new Date(Number(this.getYear()), Number(this.getMoth()) - 1, Number(this.getDay()));
    }
  }

  /**
   * @param format Format date | 'dd/MM/yyyy' | 'dd MMMMM yyyy' | 'EEEEE HH:mm' | 'dd MMMMM HH:mm' |'dd MMMMM yyyy HH:mm'
   * @param time Timestamp as time with format HHMMSS
   * @param toLowerCase Words on lower case
   * @param format12Hours 12 hours format on time
   * @return string
   * Return string with date format
   * */
  public getFormat(format: 'dd/MM/yyyy' | 'dd MMMMM yyyy' | 'dd MMMMM' | 'EEEEE HH:mm' | 'dd MMMMM HH:mm' | 'dd MMMMM yyyy HH:mm', {
    time = null,
    toLowerCase = false,
    format12Hours = false
  } = {}): string {
    let date = '', d: Date = null;
    switch (format) {
      case 'dd/MM/yyyy':
        date = `${this.getDay()}/${this.getMoth()}/${this.getYear()}`;
        break;
      case 'dd MMMMM yyyy':
        date = `${this.getDay()} ${MDate.getMonthName(this.getMoth(), toLowerCase)} ${this.getYear()}`;
        break;
      case 'dd MMMMM':
        date = `${this.getDay()} ${MDate.getMonthName(this.getMoth(), toLowerCase)}`;
        break;
      case 'EEEEE HH:mm':
        date += `${MDate.getWeekDayName(this.toDate(time).getDay() - 1, toLowerCase)}`;
        d = this.toDate(time);
        if (format12Hours) {
          date += d.getHours() === 13 ? ` a la ` : ` a las `;
          date += d.getHours() < 12 ? d.getHours() : d.getHours() - 12;
          date += ':' + d.getMinutes();
          date += d.getHours() < 12 ? ` AM` : ` PM`;
        } else {
          date += ' a las ';
          date += `${d.getHours()}:${d.getMinutes()}`;
        }
        break;
      case 'dd MMMMM HH:mm':
        date += `${this.getDay()}`;
        date += ` de ${MDate.getMonthName(this.getMoth(), toLowerCase)}`;
        d = this.toDate(time);
        if (format12Hours) {
          date += d.getHours() === 13 ? ` a la ` : ` a las `;
          date += d.getHours() < 12 ? d.getHours() : d.getHours() - 12;
          date += ':' + d.getMinutes();
          date += d.getHours() < 12 ? ` AM` : ` PM`;
        } else {
          date += ' a las ';
          date += `${d.getHours()}:${d.getMinutes()}`;
        }
        break;
      case 'dd MMMMM yyyy HH:mm':
        date += `${this.getDay()}`;
        date += ` de ${MDate.getMonthName(this.getMoth(), toLowerCase)} ${this.getYear()}`;
        d = this.toDate(time);
        if (format12Hours) {
          date += d.getHours() === 13 ? ` a la ` : ` a las `;
          date += d.getHours() < 12 ? d.getHours() : d.getHours() - 12;
          date += ':' + d.getMinutes();
          date += d.getHours() < 12 ? ` AM` : ` PM`;
        } else {
          date += ' a las ';
          date += `${d.getHours()}:${d.getMinutes()}`;
        }
        break;
    }
    return date;
  }

  private getYear(): string {
    return this._timestamp.slice(0, 4);
  }

  private getMoth(): string {
    return this._timestamp.slice(4, 6);
  }

  private getDay(): string {
    return this._timestamp.slice(6, this._timestamp.length);
  }
}