<?php
class Currency {
    private $code;
    private $currencies = array();

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

        $query = $this->db->query("SELECT * FROM " . DB_PREFIX . "currency");

        foreach ($query->rows as $result) {
            $this->currencies[$result['code']] = array(
                'currency_id'   => $result['currency_id'],
                'title'         => $result['title'],
                'symbol_left'   => $result['symbol_left'],
                'symbol_right'  => $result['symbol_right'],
                'decimal_place' => $result['decimal_place'],
                'value'         => $result['value']
            );
        }

        if (isset($this->request->get['currency']) && (array_key_exists($this->request->get['currency'], $this->currencies))) {
            $this->set($this->request->get['currency']);
        } elseif ((isset($this->session->data['currency'])) && (array_key_exists($this->session->data['currency'], $this->currencies))) {
            $this->set($this->session->data['currency']);
        } elseif ((isset($this->request->cookie['currency'])) && (array_key_exists($this->request->cookie['currency'], $this->currencies))) {
            $this->set($this->request->cookie['currency']);
        } else {
            $this->set($this->config->get('config_currency'));
        }
    }

    public function set($currency) {
        $this->code = $currency;

        if (!isset($this->session->data['currency']) || ($this->session->data['currency'] != $currency)) {
            $this->session->data['currency'] = $currency;
        }

        if (!isset($this->request->cookie['currency']) || ($this->request->cookie['currency'] != $currency)) {
            setcookie('currency', $currency, time() + 60 * 60 * 24 * 30, '/', $this->request->server['HTTP_HOST']);
        }
    }

    public function format($number, $currency = '', $value = '', $format = true) {
        if ($currency && $this->has($currency)) {
            $symbol_left = $this->currencies[$currency]['symbol_left'];
            $symbol_right = $this->currencies[$currency]['symbol_right'];
            $decimal_place = $this->currencies[$currency]['decimal_place'];
        } else {
            $symbol_left = $this->currencies[$this->code]['symbol_left'];
            $symbol_right = $this->currencies[$this->code]['symbol_right'];
            $decimal_place = $this->currencies[$this->code]['decimal_place'];

            $currency = $this->code;
        }

        if ($value) {
            $value = $value;
        } else {
            $value = $this->currencies[$currency]['value'];
        }

        if ($value) {
            $value = (float)$number * $value;
        } else {
            $value = $number;
        }

        $string = '';

        $negative = false;

        if ($value < 0) {
            $value = $value * -1;

            $negative = true;
        }

        if (($symbol_left) && ($format)) {
            $string .= $symbol_left;
        }

        if ($format) {
            $decimal_point = $this->language->get('decimal_point');
        } else {
            $decimal_point = '.';
        }

        if ($format) {
            $thousand_point = $this->language->get('thousand_point');
        } else {
            $thousand_point = '';
        }

        $string .= number_format(round($value, (int)$decimal_place), (int)$decimal_place, $decimal_point, $thousand_point);

        if (($symbol_right) && ($format)) {
            $string .= $symbol_right;
        }

        if ($negative) {
            $string = '(' . $string . ')';
        }

        return $string;
    }

    public function convert($value, $from, $to) {
        if (isset($this->currencies[$from])) {
            $from = $this->currencies[$from]['value'];
        } else {
            $from = 0;
        }

        if (isset($this->currencies[$to])) {
            $to = $this->currencies[$to]['value'];
        } else {
            $to = 0;
        }

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

    public function getId($currency = '') {
        if (!$currency) {
            return $this->currencies[$this->code]['currency_id'];
        } elseif ($currency && isset($this->currencies[$currency])) {
            return $this->currencies[$currency]['currency_id'];
        } else {
            return 0;
        }
    }

    public function getSymbolLeft($currency = '') {
        if (!$currency) {
            return $this->currencies[$this->code]['symbol_left'];
        } elseif ($currency && isset($this->currencies[$currency])) {
            return $this->currencies[$currency]['symbol_left'];
        } else {
            return '';
        }
    }

    public function getSymbolRight($currency = '') {
        if (!$currency) {
            return $this->currencies[$this->code]['symbol_right'];
        } elseif ($currency && isset($this->currencies[$currency])) {
            return $this->currencies[$currency]['symbol_right'];
        } else {
            return '';
        }
    }

    public function getDecimalPlace($currency = '') {
        if (!$currency) {
            return $this->currencies[$this->code]['decimal_place'];
        } elseif ($currency && isset($this->currencies[$currency])) {
            return $this->currencies[$currency]['decimal_place'];
        } else {
            return 0;
        }
    }

    public function getCode() {
        return $this->code;
    }

    public function getValue($currency = '') {
        if (!$currency) {
            return $this->currencies[$this->code]['value'];
        } elseif ($currency && isset($this->currencies[$currency])) {
            return $this->currencies[$currency]['value'];
        } else {
            return 0;
        }
    }

    public function has($currency) {
        return isset($this->currencies[$currency]);
    }
}