<?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;
	}
}
