import { Injectable } from '@angular/core';
import { parse, format } from 'date-fns';

@Injectable({
  providedIn: 'root',
})
export class MiscHelpersService {
  constructor() {}
  parseDateTimeString(isoString: string): {
    dateString: string;
    timeString: string;
  } {
    if (!isoString) {
      return {
        dateString: '',
        timeString: '12:00am',
      };
    }
    const date = parse(isoString, 'YYYY-MM-DDT00:00:00.000Z', new Date());
    const dateString = format(date, 'YYYY-MM-DDT00:00:00.000Z');
    const dateStringDate = new Date(dateString);
    const offset = dateStringDate.getTimezoneOffset();
    if (offset > 0) {
      dateStringDate.setHours(dateStringDate.getHours() + 12, 0, 0);
    }
    return {
      dateString: dateStringDate.toISOString(),
      timeString: format(date, 'h:mma'),
    };
  }

  convertDateTimeToDate(dateTime: Date | string): string {
    if (!dateTime) {
      return '';
    }
    if (typeof dateTime === 'string') {
      return dateTime.substr(0, 10);
    }
    const year = dateTime.getFullYear();
    const month =
      dateTime.getMonth() + 1 > 9
        ? (dateTime.getMonth() + 1).toString()
        : `0${dateTime.getMonth() + 1}`;
    const day =
      dateTime.getDate() > 9
        ? dateTime.getDate().toString()
        : `0${dateTime.getDate()}`;
    return `${year}-${month}-${day}`;
  }

  // dateString: YYYY-MM-DD
  convertDateToDateTime(dateString: string): string {
    if (!dateString) {
      return dateString;
    }
    const date = new Date(`${dateString}T00:00:00.000`);
    return date.toISOString();
  }

  formatMediumDate(inputDateString: string): string {
    const date = new Date(inputDateString);
    return isNaN(+date) ? '' : format(date, 'MMM D, YYYY');
  }
  formatShortDateTime(inputDateString: string): string {
    const date = new Date(inputDateString);
    return isNaN(+date) ? '' : format(date, 'M/D/YY, h:mm A');
  }
  formatUSD(price: number): string {
    if (price === null || isNaN(price)) {
      return '$0.00';
    }
    return `$${this.formatNumber(price)}`;
  }
  formatNumber(num: number): string {
    if (num === null || isNaN(num)) {
      return '0.00';
    }
    return `${(Math.round(num * 100) / 100).toFixed(2)}`;
  }
  createSearchText(...inputs: Array<string | number>): string {
    return inputs.join('\0'); // '\0' is the literal null character
  }
}