<?php

/**
 * SOM Metric class.
 *
 * All conversions are limited to 2 decimal places.
 */
class WPStrava_SOMMetric extends WPStrava_SOM {

	/**
	 * Change meters to kilometers.
	 *
	 * @param float|string $m Distance in meters.
	 * @return string Distance in kilometers.
	 */
	public function distance( $m ) {
		return number_format_i18n( $m / 1000, 2 );
	}

	/**
	 * Change kilometers to meters.
	 *
	 * @param float $dist Distance in kilometers.
	 * @return float Distance in meters.
	 */
	public function distance_inverse( $dist ) {
		return (float) number_format( $dist * 1000, 2, '.', '' );
	}

	/**
	 * Abbreviated label for this system of measure's distance - Kilometers: km
	 *
	 * @return string 'km'
	 */
	public function get_distance_label() {
		return __( 'km', 'wp-strava' );
	}

	/**
	 * Change meters per second to kilometers per hour.
	 *
	 * @param float|string $mps Meters per second.
	 * @return string Kilometers per hour.
	 */
	public function speed( $mps ) {
		return number_format_i18n( $mps * 3.6, 2 );
	}

	/**
	 * Abbreviated label for this system of measure's speed - Kilometers Per Hour: km/h
	 *
	 * @return string 'km/h'
	 */
	public function get_speed_label() {
		return __( 'km/h', 'wp-strava' );
	}

	/**
	 * Change meters per second to minutes per kilometer.
	 *
	 * @param float|string $mps Meters per second.
	 * @return string Minutes per kilometer.
	 */
	public function pace( $mps ) {

		if ( ! $mps ) {
			return __( 'N/A', 'wp-strava' );
		}

		// 4 m/s => 14,4 km/h => 4:10 min/km
		$kmh = $mps * 3.6;
		$s   = 3600 / $kmh;
		$ss  = $s / 60;
		$ms  = floor( $ss ) * 60;
		$sec = sprintf( '%02d', round( $s - $ms ) );
		$min = floor( $ss );

		return "{$min}:{$sec}";
	}

	/**
	 * Abbreviated label for this system of measure's speed - Minutes Per Kilometers: min/km
	 *
	 * @return string 'min/km'
	 */
	public function get_pace_label() {
		return __( 'min/km', 'wp-strava' );
	}

	/**
	 * Change meters to meters };^)
	 *
	 * @param float|string $m Elevation in meters.
	 * @return string Elevation in meters.
	 */
	public function elevation( $m ) {
		return number_format_i18n( $m, 2 );
	}

	/**
	 * Abbreviated label for this system of measure's elevation - Meters: meters
	 *
	 * @return string 'meters'
	 */
	public function get_elevation_label() {
		return __( 'meters', 'wp-strava' );
	}
}