<?php

namespace Cart;

class Length {
    private $lengths = array();

    public function __construct($registry) {
        $this->db = $registry->get('db');
        $this->config = $registry->get('config');

        $length_class_query = $this->db->query("SELECT * FROM " . DB_PREFIX . "length_class mc LEFT JOIN " . DB_PREFIX . "length_class_description mcd ON (mc.length_class_id = mcd.length_class_id) WHERE mcd.language_id = '" . (int)$this->config->get('config_language_id') . "'");

        foreach ($length_class_query->rows as $result) {
            $this->lengths[$result['length_class_id']] = array(
                'length_class_id' => $result['length_class_id'],
                'title'           => $result['title'],
                'unit'            => $result['unit'],
                'value'           => $result['value']
            );
        }
    }

    public function convert($value, $from, $to) {
        if ($from == $to) {
            return $value;
        }

        if (isset($this->lengths[$from])) {
            $from = $this->lengths[$from]['value'];
        } else {
            $from = 1;
        }

        if (isset($this->lengths[$to])) {
            $to = $this->lengths[$to]['value'];
        } else {
            $to = 1;
        }

        return $value * ($to / $from);
    }

    public function format($value, $length_class_id, $decimal_point = '.', $thousand_point = ',') {
        if (isset($this->lengths[$length_class_id])) {
            return number_format($value, 2, $decimal_point, $thousand_point) . $this->lengths[$length_class_id]['unit'];
        } else {
            return number_format($value, 2, $decimal_point, $thousand_point);
        }
    }

    public function getUnit($length_class_id) {
        if (isset($this->lengths[$length_class_id])) {
            return $this->lengths[$length_class_id]['unit'];
        } else {
            return '';
        }
    }

}