import { __, sprintf } from '@wordpress/i18n';
import { formatNumber } from '../../shared/lib/numbers';
import { timeAgo } from '../../shared/lib/timeAgo';
import { MILLISECONDS_PER_SECOND } from '../../shared/lib/timeUnits';

const SECONDS_SHOWN_BELOW = 120;

function secondsSinceRun( lastRunAt: string, now: number ): number {
	const elapsedMilliseconds = now - Date.parse( lastRunAt );

	return Math.max(
		0,
		Math.round( elapsedMilliseconds / MILLISECONDS_PER_SECOND )
	);
}

export function lastRunText( lastRunAt: string, now: number ): string {
	const seconds = secondsSinceRun( lastRunAt, now );

	if ( seconds < SECONDS_SHOWN_BELOW ) {
		return sprintf(
			/* translators: %s: number of seconds */
			__( 'It last ran %s seconds ago.', 'aiplaz-link-checkup' ),
			formatNumber( seconds )
		);
	}

	return sprintf(
		/* translators: %s: how long ago, for example "2 hours ago" */
		__( 'It last ran %s.', 'aiplaz-link-checkup' ),
		timeAgo( lastRunAt, now )
	);
}

export function schedulerHealthText( isHealthy: boolean ): string {
	if ( isHealthy ) {
		return __( 'The scheduler is working.', 'aiplaz-link-checkup' );
	}

	return __(
		'The scheduler has not run for a while.',
		'aiplaz-link-checkup'
	);
}