<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\i18n;

use Yii;
use IntlDateFormatter;
use NumberFormatter;
use DateTime;
use yii\base\InvalidConfigException;

/**
 * Formatter is the localized version of [[\yii\base\Formatter]].
 *
 * Formatter requires the PHP "intl" extension to be installed. Formatter supports localized
 * formatting of date, time and numbers, based on the current [[locale]].
 *
 * This Formatter can replace the `formatter` application component that is configured by default.
 * To do so, add the following to your application config under `components`:
 *
 * ```php
 * 'formatter' => [
 *     'class' => 'yii\i18n\Formatter',
 * ]
 * ```
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class Formatter extends \yii\base\Formatter
{
    /**
     * @var string the locale ID that is used to localize the date and number formatting.
     * If not set, [[\yii\base\Application::language]] will be used.
     */
    public $locale;
    /**
     * @var string the default format string to be used to format a date.
     * This can be "short", "medium", "long", or "full", which represents a preset format of different lengths.
     * It can also be a custom format as specified in the [ICU manual](http://userguide.icu-project.org/formatparse/datetime).
     */
    public $dateFormat = 'short';
    /**
     * @var string the default format string to be used to format a time.
     * This can be "short", "medium", "long", or "full", which represents a preset format of different lengths.
     * It can also be a custom format as specified in the [ICU manual](http://userguide.icu-project.org/formatparse/datetime).
     */
    public $timeFormat = 'short';
    /**
     * @var string the default format string to be used to format a date and time.
     * This can be "short", "medium", "long", or "full", which represents a preset format of different lengths.
     * It can also be a custom format as specified in the [ICU manual](http://userguide.icu-project.org/formatparse/datetime).
     */
    public $datetimeFormat = 'short';
    /**
     * @var array the options to be set for the NumberFormatter objects. Please refer to
     * [PHP manual](http://php.net/manual/en/class.numberformatter.php#intl.numberformatter-constants.unumberformatattribute)
     * for the possible options. This property is used by [[createNumberFormatter]] when
     * creating a new number formatter to format decimals, currencies, etc.
     */
    public $numberFormatOptions = [];
    /**
     * @var string the character displayed as the decimal point when formatting a number.
     * If not set, the decimal separator corresponding to [[locale]] will be used.
     */
    public $decimalSeparator;
    /**
     * @var string the character displayed as the thousands separator character when formatting a number.
     * If not set, the thousand separator corresponding to [[locale]] will be used.
     */
    public $thousandSeparator;

    /**
     * Initializes the component.
     * This method will check if the "intl" PHP extension is installed and set the
     * default value of [[locale]].
     * @throws InvalidConfigException if the "intl" PHP extension is not installed.
     */
    public function init()
    {
        if (!extension_loaded('intl')) {
            throw new InvalidConfigException('The "intl" PHP extension is not installed. It is required to format data values in localized formats.');
        }
        if ($this->locale === null) {
            $this->locale = Yii::$app->language;
        }
        if ($this->decimalSeparator === null || $this->thousandSeparator === null) {
            $formatter = new NumberFormatter($this->locale, NumberFormatter::DECIMAL);
            if ($this->decimalSeparator === null) {
                $this->decimalSeparator = $formatter->getSymbol(NumberFormatter::DECIMAL_SEPARATOR_SYMBOL);
            }
            if ($this->thousandSeparator === null) {
                $this->thousandSeparator = $formatter->getSymbol(NumberFormatter::GROUPING_SEPARATOR_SYMBOL);
            }
        }

        parent::init();
    }

    private $_dateFormats = [
        'short' => IntlDateFormatter::SHORT,
        'medium' => IntlDateFormatter::MEDIUM,
        'long' => IntlDateFormatter::LONG,
        'full' => IntlDateFormatter::FULL,
    ];

    /**
     * Formats the value as a date.
     * @param integer|string|DateTime $value the value to be formatted. The following
     * types of value are supported:
     *
     * - an integer representing a UNIX timestamp
     * - a string that can be parsed into a UNIX timestamp via `strtotime()`
     * - a PHP DateTime object
     *
     * @param string $format the format used to convert the value into a date string.
     * If null, [[dateFormat]] will be used.
     *
     * This can be "short", "medium", "long", or "full", which represents a preset format of different lengths.
     * It can also be a custom format as specified in the [ICU manual](http://userguide.icu-project.org/formatparse/datetime).
     *
     * @return string the formatted result
     * @throws InvalidConfigException when formatting fails due to invalid parameters.
     * @see dateFormat
     */
    public function asDate($value, $format = null)
    {
        if ($value === null) {
            return $this->nullDisplay;
        }
        $value = $this->normalizeDatetimeValue($value);
        if ($format === null) {
            $format = $this->dateFormat;
        }
        if (isset($this->_dateFormats[$format])) {
            $formatter = new IntlDateFormatter($this->locale, $this->_dateFormats[$format], IntlDateFormatter::NONE, $this->timeZone);
        } else {
            $formatter = new IntlDateFormatter($this->locale, IntlDateFormatter::NONE, IntlDateFormatter::NONE, $this->timeZone);
            if ($formatter !== null) {
                $formatter->setPattern($format);
            }
        }
        if ($formatter === null) {
            throw new InvalidConfigException(intl_get_error_message());
        }

        return $formatter->format($value);
    }

    /**
     * Formats the value as a time.
     * @param integer|string|DateTime $value the value to be formatted. The following
     * types of value are supported:
     *
     * - an integer representing a UNIX timestamp
     * - a string that can be parsed into a UNIX timestamp via `strtotime()`
     * - a PHP DateTime object
     *
     * @param string $format the format used to convert the value into a date string.
     * If null, [[dateFormat]] will be used.
     *
     * This can be "short", "medium", "long", or "full", which represents a preset format of different lengths.
     * It can also be a custom format as specified in the [ICU manual](http://userguide.icu-project.org/formatparse/datetime).
     *
     * @return string the formatted result
     * @throws InvalidConfigException when formatting fails due to invalid parameters.
     * @see timeFormat
     */
    public function asTime($value, $format = null)
    {
        if ($value === null) {
            return $this->nullDisplay;
        }
        $value = $this->normalizeDatetimeValue($value);
        if ($format === null) {
            $format = $this->timeFormat;
        }
        if (isset($this->_dateFormats[$format])) {
            $formatter = new IntlDateFormatter($this->locale, IntlDateFormatter::NONE, $this->_dateFormats[$format], $this->timeZone);
        } else {
            $formatter = new IntlDateFormatter($this->locale, IntlDateFormatter::NONE, IntlDateFormatter::NONE, $this->timeZone);
            if ($formatter !== null) {
                $formatter->setPattern($format);
            }
        }
        if ($formatter === null) {
            throw new InvalidConfigException(intl_get_error_message());
        }

        return $formatter->format($value);
    }

    /**
     * Formats the value as a datetime.
     * @param integer|string|DateTime $value the value to be formatted. The following
     * types of value are supported:
     *
     * - an integer representing a UNIX timestamp
     * - a string that can be parsed into a UNIX timestamp via `strtotime()`
     * - a PHP DateTime object
     *
     * @param string $format the format used to convert the value into a date string.
     * If null, [[dateFormat]] will be used.
     *
     * This can be "short", "medium", "long", or "full", which represents a preset format of different lengths.
     * It can also be a custom format as specified in the [ICU manual](http://userguide.icu-project.org/formatparse/datetime).
     *
     * @return string the formatted result
     * @throws InvalidConfigException when formatting fails due to invalid parameters.
     * @see datetimeFormat
     */
    public function asDatetime($value, $format = null)
    {
        if ($value === null) {
            return $this->nullDisplay;
        }
        $value = $this->normalizeDatetimeValue($value);
        if ($format === null) {
            $format = $this->datetimeFormat;
        }
        if (isset($this->_dateFormats[$format])) {
            $formatter = new IntlDateFormatter($this->locale, $this->_dateFormats[$format], $this->_dateFormats[$format], $this->timeZone);
        } else {
            $formatter = new IntlDateFormatter($this->locale, IntlDateFormatter::NONE, IntlDateFormatter::NONE, $this->timeZone);
            if ($formatter !== null) {
                $formatter->setPattern($format);
            }
        }
        if ($formatter === null) {
            throw new InvalidConfigException(intl_get_error_message());
        }

        return $formatter->format($value);
    }

    /**
     * Formats the value as a decimal number.
     * @param mixed $value the value to be formatted
     * @param string $format the format to be used. Please refer to [ICU manual](http://www.icu-project.org/apiref/icu4c/classDecimalFormat.html#_details)
     * for details on how to specify a format.
     * @return string the formatted result.
     */
    public function asDecimal($value, $format = null)
    {
        if ($value === null) {
            return $this->nullDisplay;
        }

        return $this->createNumberFormatter(NumberFormatter::DECIMAL, $format)->format($value);
    }

    /**
     * Formats the value as a currency number.
     * @param mixed $value the value to be formatted
     * @param string $currency the 3-letter ISO 4217 currency code indicating the currency to use.
     * @param string $format the format to be used. Please refer to [ICU manual](http://www.icu-project.org/apiref/icu4c/classDecimalFormat.html#_details)
     * for details on how to specify a format.
     * @return string the formatted result.
     */
    public function asCurrency($value, $currency = 'USD', $format = null)
    {
        if ($value === null) {
            return $this->nullDisplay;
        }

        return $this->createNumberFormatter(NumberFormatter::CURRENCY, $format)->formatCurrency($value, $currency);
    }

    /**
     * Formats the value as a percent number.
     * @param mixed $value the value to be formatted
     * @param string $format the format to be used. Please refer to [ICU manual](http://www.icu-project.org/apiref/icu4c/classDecimalFormat.html#_details)
     * for details on how to specify a format.
     * @return string the formatted result.
     */
    public function asPercent($value, $format = null)
    {
        if ($value === null) {
            return $this->nullDisplay;
        }

        return $this->createNumberFormatter(NumberFormatter::PERCENT, $format)->format($value);
    }

    /**
     * Formats the value as a scientific number.
     * @param mixed $value the value to be formatted
     * @param string $format the format to be used. Please refer to [ICU manual](http://www.icu-project.org/apiref/icu4c/classDecimalFormat.html#_details)
     * for details on how to specify a format.
     * @return string the formatted result.
     */
    public function asScientific($value, $format = null)
    {
        if ($value === null) {
            return $this->nullDisplay;
        }

        return $this->createNumberFormatter(NumberFormatter::SCIENTIFIC, $format)->format($value);
    }

    /**
     * Creates a number formatter based on the given type and format.
     * @param integer $type the type of the number formatter
     * @param string $format the format to be used. Please refer to [ICU manual](http://www.icu-project.org/apiref/icu4c/classDecimalFormat.html#_details)
     * @return NumberFormatter the created formatter instance
     */
    protected function createNumberFormatter($type, $format)
    {
        $formatter = new NumberFormatter($this->locale, $type);
        if ($format !== null) {
            $formatter->setPattern($format);
        }
        if (!empty($this->numberFormatOptions)) {
            foreach ($this->numberFormatOptions as $name => $attribute) {
                $formatter->setAttribute($name, $attribute);
            }
        }

        return $formatter;
    }
}