<?php

namespace SilverStripe\ORM\FieldType;

use SilverStripe\Forms\FormField;
use SilverStripe\Forms\MoneyField;
use SilverStripe\i18n\i18n;
use Zend_Currency;

require_once 'Zend/Currency.php';

/**
 * Implements the "Money" pattern.
 *
 * @see http://www.martinfowler.com/eaaCatalog/money.html
 *
 * @todo Support different ways of rounding
 * @todo Equality operators
 * @todo Addition, substraction and allocation of values
 * @todo Model validation for $allowedCurrencies
 */
class DBMoney extends DBComposite
{

    /**
     * @var string $locale
     */
    protected $locale = null;

    /**
     * @var Zend_Currency
     */
    protected $currencyLib;

    /**
     * Limit the currencies
     * @var array $allowedCurrencies
     */
    protected $allowedCurrencies;

    /**
     * @param array
     */
    private static $composite_db = array(
        "Currency" => "Varchar(3)",
        "Amount" => 'Decimal(19,4)'
    );

    public function __construct($name = null)
    {
        $this->currencyLib = new Zend_Currency(null, i18n::get_locale());

        parent::__construct($name);
    }

    /**
     * @param array $options
     * @return string
     */
    public function Nice($options = array())
    {
        $amount = $this->getAmount();
        if (!isset($options['display'])) {
            $options['display'] = Zend_Currency::USE_SYMBOL;
        }
        if (!isset($options['currency'])) {
            $options['currency'] = $this->getCurrency();
        }
        if (!isset($options['symbol'])) {
            $options['symbol'] = $this->currencyLib->getSymbol($this->getCurrency(), $this->getLocale());
        }
        return (is_numeric($amount)) ? $this->currencyLib->toCurrency($amount, $options) : '';
    }

    /**
     * @param array $options
     * @return string
     */
    public function NiceWithShortname($options = array())
    {
        $options['display'] = Zend_Currency::USE_SHORTNAME;
        return $this->Nice($options);
    }

    /**
     * @param array $options
     * @return string
     */
    public function NiceWithName($options = array())
    {
        $options['display'] = Zend_Currency::USE_NAME;
        return $this->Nice($options);
    }

    /**
     * @return string
     */
    public function getCurrency()
    {
        return $this->getField('Currency');
    }

    /**
     * @param string $currency
     * @param bool $markChanged
     */
    public function setCurrency($currency, $markChanged = true)
    {
        $this->setField('Currency', $currency, $markChanged);
    }

    /**
     * @return float
     */
    public function getAmount()
    {
        return $this->getField('Amount');
    }

    /**
     * @param float $amount
     * @param bool $markChanged
     */
    public function setAmount($amount, $markChanged = true)
    {
        $this->setField('Amount', (float)$amount, $markChanged);
    }

    /**
     * @return boolean
     */
    public function exists()
    {
        return ($this->getCurrency() && is_numeric($this->getAmount()));
    }

    /**
     * @return boolean
     */
    public function hasAmount()
    {
        $a = $this->getAmount();
        return (!empty($a) && is_numeric($a));
    }

    /**
     * @param string $locale
     */
    public function setLocale($locale)
    {
        $this->locale = $locale;
        $this->currencyLib->setLocale($locale);
    }

    /**
     * @return string
     */
    public function getLocale()
    {
        return ($this->locale) ? $this->locale : i18n::get_locale();
    }

    /**
     * @param string $currency
     * @param string $locale
     * @return string
     */
    public function getSymbol($currency = null, $locale = null)
    {

        if ($locale === null) {
            $locale = $this->getLocale();
        }
        if ($currency === null) {
            $currency = $this->getCurrency();
        }

        return $this->currencyLib->getSymbol($currency, $locale);
    }

    /**
     * @param string $currency
     * @param string $locale
     * @return string
     */
    public function getShortName($currency = null, $locale = null)
    {
        if ($locale === null) {
            $locale = $this->getLocale();
        }
        if ($currency === null) {
            $currency = $this->getCurrency();
        }

        return $this->currencyLib->getShortName($currency, $locale);
    }

    /**
     * @param string $currency
     * @param string $locale
     * @return string
     */
    public function getCurrencyName($currency = null, $locale = null)
    {
        if ($locale === null) {
            $locale = $this->getLocale();
        }
        if ($currency === null) {
            $currency = $this->getCurrency();
        }

        return $this->currencyLib->getName($currency, $locale);
    }

    /**
     * @param array $arr
     */
    public function setAllowedCurrencies($arr)
    {
        $this->allowedCurrencies = $arr;
    }

    /**
     * @return array
     */
    public function getAllowedCurrencies()
    {
        return $this->allowedCurrencies;
    }

    /**
     * Returns a CompositeField instance used as a default
     * for form scaffolding.
     *
     * Used by {@link SearchContext}, {@link ModelAdmin}, {@link DataObject::scaffoldFormFields()}
     *
     * @param string $title Optional. Localized title of the generated instance
     * @param array $params
     * @return FormField
     */
    public function scaffoldFormField($title = null, $params = null)
    {
        $field = new MoneyField($this->getName());
        $field->setAllowedCurrencies($this->getAllowedCurrencies());
        $field->setLocale($this->getLocale());

        return $field;
    }

    /**
     * For backwards compatibility reasons
     * (mainly with ecommerce module),
     * this returns the amount value of the field,
     * rather than a {@link Nice()} formatting.
     */
    public function __toString()
    {
        return (string)$this->getAmount();
    }
}