<?php
/**
 * @brief		Weight Object
 * @subpackage	Nexus
 * @since		13 Feb 2014
 */

namespace IPS\nexus\Shipping;

/* To prevent PHP errors (extending class does not exist) revealing path */
if ( !\defined( '\IPS\SUITE_UNIQUE_KEY' ) )
{
	header( ( isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0' ) . ' 403 Forbidden' );
	exit;
}

/**
 * Weight Object
 */
class _Weight
{
	/**
	 * @brief	Conversion rates
	 */
	public static $conversionRates = array(
		'kg'	=> 1,
		'lb'	=> 0.45359237,
		'oz'	=> 0.028349523125
	);
		
	/**
	 * @brief	Weight in kilograms (naturally we use kilograms as per le système international d'unités like good boys)
	 */
	public $kilograms = 0;
	
	/**
	 * Best display unit
	 *
	 * @param	\IPS\Member|NULL	$member	The member
	 * @return	string
	 */
	public static function bestUnit( \IPS\Member $member = NULL )
	{
		$member = $member ?: \IPS\Member::loggedIn();
			
		/* US uses lbs. This is a more reliable way to detect if locale
		   if US, as Windows and Nix use different locale keys, but both
		   will set the currency symbol to USD for US only */
		if ( trim( $member->language()->locale['int_curr_symbol'] ) === 'USD' )
		{
			return 'lb';
		}
		
		return 'kg';
	}
	
	/**
	 * Contructor
	 *
	 * @param	float	$amount	Weight
	 * @param	string	$unit	Unit
	 * @return	void
	 */
	public function __construct( $amount, $unit='kg' )
	{		
		$this->kilograms = ( $amount * static::$conversionRates[ $unit ] );
	}
	
	/**
	 * Get as float
	 *
	 * @param	string	$unit	Unit
	 * @return	float
	 */
	public function float( $unit='kg' )
	{
		return $this->kilograms / static::$conversionRates[ $unit ];
	}
	
	/**
	 * Get as string
	 *
	 * @param	string|NULL	$unit	Unit (NULL to autodetect)
	 * @param	int|NULL	$round	Decimal places to round to
	 * @return	float
	 */
	public function string( $unit=NULL, $round=2 )
	{
		if ( $unit === NULL )
		{
			$unit = static::bestUnit();
		}

		return \IPS\Member::loggedIn()->language()->addToStack( 'weight_short_' . $unit, FALSE, array( 'sprintf' => array( round( $this->float( $unit ), $round ) ) ) );
	}
}