<?php

/**

 * I18N: WP_Translations class.

 *

 * @package WordPress

 * @subpackage I18N

 * @since 6.5.0

 */

/**

 * Class WP_Translations.

 *

 * @since 6.5.0

 *

 * @property-read array<string, string> $headers

 * @property-read array<string, string[]> $entries

 */

class WP_Translations {

	/**

	 * Text domain.

	 *

	 * @since 6.5.0

	 * @var string

	 */

	protected $textdomain = 'default';

	/**

	 * Translation controller instance.

	 *

	 * @since 6.5.0

	 * @var WP_Translation_Controller

	 */

	protected $controller;

	/**

	 * Constructor.

	 *

	 * @since 6.5.0

	 *

	 * @param WP_Translation_Controller $controller I18N controller.

	 * @param string                    $textdomain Optional. Text domain. Default 'default'.

	 */

	public function __construct( WP_Translation_Controller $controller, string $textdomain = 'default' ) {

		$this->controller = $controller;

		$this->textdomain = $textdomain;

	}

	/**

	 * Magic getter for backward compatibility.

	 *

	 * @since 6.5.0

	 *

	 * @param string $name Property name.

	 * @return mixed

	 */

	public function __get( string $name ) {

		if ( 'entries' === $name ) {

			$entries = $this->controller->get_entries( $this->textdomain );

			$result = array();

			foreach ( $entries as $original => $translations ) {

				$result[] = $this->make_entry( $original, $translations );

			}

			return $result;

		}

		if ( 'headers' === $name ) {

			return $this->controller->get_headers( $this->textdomain );

		}

		return null;

	}

	/**

	 * Builds a Translation_Entry from original string and translation strings.

	 *

	 * @see MO::make_entry()

	 *

	 * @since 6.5.0

	 *

	 * @param string $original     Original string to translate from MO file. Might contain

	 *                             0x04 as context separator or 0x00 as singular/plural separator.

	 * @param string $translations Translation strings from MO file.

	 * @return Translation_Entry Entry instance.

	 */

	private function make_entry( $original, $translations ): Translation_Entry {

		$entry = new Translation_Entry();

		// Look for context, separated by \4.

		$parts = explode( "\4", $original );

		if ( isset( $parts[1] ) ) {

			$original       = $parts[1];

			$entry->context = $parts[0];

		}

		$entry->singular     = $original;

		$entry->translations = explode( "\0", $translations );

		$entry->is_plural    = count( $entry->translations ) > 1;

		return $entry;

	}

	/**

	 * Translates a plural string.

	 *

	 * @since 6.5.0

	 *

	 * @param string|null $singular Singular string.

	 * @param string|null $plural   Plural string.

	 * @param int|float   $count    Count. Should be an integer, but some plugins pass floats.

	 * @param string|null $context  Context.

	 * @return string|null Translation if it exists, or the unchanged singular string.

	 */

	public function translate_plural( $singular, $plural, $count = 1, $context = '' ) {

		if ( null === $singular || null === $plural ) {

			return $singular;

		}

		$translation = $this->controller->translate_plural( array( $singular, $plural ), (int) $count, (string) $context, $this->textdomain );

		if ( false !== $translation ) {

			return $translation;

		}

		// Fall back to the original with English grammar rules.

		return ( 1 === $count ? $singular : $plural );

	}

	/**

	 * Translates a singular string.

	 *

	 * @since 6.5.0

	 *

	 * @param string|null $singular Singular string.

	 * @param string|null $context  Context.

	 * @return string|null Translation if it exists, or the unchanged singular string

	 */

	public function translate( $singular, $context = '' ) {

		if ( null === $singular ) {

			return null;

		}

		$translation = $this->controller->translate( $singular, (string) $context, $this->textdomain );

		if ( false !== $translation ) {

			return $translation;

		}

		// Fall back to the original.

		return $singular;

	}

}