import { Period } from './constants';
import { removeDaysFromDate } from './date';

export interface AnalyticsApiQueryParams extends AnalyticsApiOptionalQueryParams {
	type: string,
}

export interface AnalyticsApiOptionalQueryParams extends ApiPeriodRange {
	pub_date_start?: string;
	pub_date_end?: string;
	sort?: string;
	limit?: number;
	page?: number;
	author?: string;
	tag?: string[];
	section?: string;
	segment?: string;
}

export interface ApiPeriodRange {
	period_start?: string; // Defaults to 3 days ago.
	period_end?: string; // Defaults to current date and time.
}

/**
 * Gets `period_start` and `period_end` params for API.
 *
 * @param {Period} period Number of days for which to calculate the period range.
 *
 * @return {ApiPeriodRange} API query params.
 */
export function getApiPeriodParams( period: Period ): ApiPeriodRange {
	return {
		period_start: period,
		period_end: '',
	};
}

/**
 * Gets period start date for API.
 *
 * @param {number} days Number of days for which to calculate the period start
 *                      date.
 *
 * @return {string} period start date.
 */
export function getApiPeriodStartDate( days: number ): string {
	return removeDaysFromDate( new Date(), days - 1 ) + 'T00:00';
}