import { format, parse } from 'date-fns';
import locale from "date-fns/locale/fr";

export default class DatesUtils {
  private $dateFns: dateFns;
  private $t: any
  private $i18n: any

  private ISO_FORMAT = 'yyyy-MM-dd';

  constructor(dateFns: dateFns, t: any, i18n: any) {
    this.$dateFns = dateFns
    this.$t = t
    this.$i18n = i18n
  }

  formatIso(date: Date): string {
    return format(date, this.ISO_FORMAT)
  }

  today(): Date {
    return new Date()
  }

  todayIso(): string {
    return this.formatIso(this.today())
  }

  formatIsoDate(date: string, fmt: string): string {
    return format(parse(date, this.ISO_FORMAT, new Date()), fmt);
  }

  reformatDate(date: string, fromFormat: string, toFormat: string): string {
    return format(parse(date, fromFormat, new Date()), toFormat);
  }

  formatDate(date: Date, short = true): string {
    return short ? this.$dateFns.format(date, 'dd/MM/yyyy') : this.$dateFns.format(date, 'dd MMM yyyy', {locale: locale})
  }

  formatTime(date: Date): string {
    return this.$dateFns.format(date, "HH'h'mm")
  }

  formatDateTime(date: Date): string {
    return this.formatDate(date) + ' ' + this.$t('on_hour') + ' ' + this.formatTime(date)
  }

  formatDateIntervalFor(dateStart: Date | null = null, dateEnd: Date | null = null): string {
    if (dateStart === null && dateEnd !== null) {
      return this.formatDateTime(dateEnd)
    } else if (dateEnd === null && dateStart !== null) {
      return this.formatDateTime(dateStart)
    } else if (dateStart !== null && dateEnd !== null) {
      if (this.$dateFns.isEqual(dateStart, dateEnd)) {
        return this.formatDateTime(dateStart)
      } else if (this.$dateFns.isSameDay(dateStart, dateEnd)) {
        return this.formatDate(dateStart, false) + ', ' +
          this.formatTime(dateStart) + ' - ' + this.formatTime(dateEnd)
      } else {
        return this.$t('from_day') + ' ' + this.formatDateTime(dateStart) + ' ' + this.$t('to_day') + ' ' + this.formatDateTime(dateEnd)
      }
    }
    return ""
  }
}