* @global SitePress $sitepress
 * @uses  \SitePress::api_hooks
 */
function wpml_add_language_form_field_action() {
	echo wpml_get_language_form_field();
}

function wpml_language_form_field_shortcode() {
	return wpml_get_language_form_field();
}

function wpml_get_language_form_field() {
	$language_form_field = '';
	global $sitepress;
	if ( isset( $sitepress ) ) {
		$current_language    = $sitepress->get_current_language();
		$language_form_field = "<input type='hidden' name='lang' value='" . esc_attr( $current_language ) . "' />";
		$language_form_field = apply_filters( 'wpml_language_form_input_field', $language_form_field, $current_language );
	}

	return $language_form_field;
}

/**
 * @since      unknown
 * @deprecated 3.2 use 'wpml_element_translation_type' filter instead
 *
 * @param int    $id
 * @param string $type
 *
 * @return bool|int
 */
function wpml_get_translation_type( $id, $type = 'post' ) {
	$translation_type = WPML_ELEMENT_IS_NOT_TRANSLATED;

	if ( $type == 'post' ) {
		$translation_type = wpml_post_has_translations( $id );
	}

	// TODO: [WPML 3.3] handle other element types (e.g. taxonomies, strings, etc.)

	return $translation_type;
}

/**
 * @since 3.2
 * Accepts the ID and type of an element and returns its translation type.
 * Values will be one of these:
 *      WPML_ELEMENT_IS_NOT_TRANSLATED  = 0
 *      WPML_ELEMENT_IS_TRANSLATED      = 1
 *      WPML_ELEMENT_IS_DUPLICATED      = 2
 *      WPML_ELEMENT_IS_A_DUPLICATE     = 3
 *
 * @param mixed  $empty_value
 *
 * @see   \wpml_get_active_languages_filter
 *
 * @param int    $element_id    The element id to retrieve the information of. Use term_id for taxonomies, post_id for posts
 * @param string $element_type  Can be a post type: post, page, attachment, nav_menu_item, {custom post key}
 *                              or taxonomy: category, post_tag, nav_menu {custom taxonomy key}
 *
 * @return int
 * @uses  \SitePress::api_hooks
 */
function wpml_get_element_translation_type_filter( $empty_value, $element_id, $element_type ) {
	$translation_type = WPML_ELEMENT_IS_NOT_TRANSLATED;

	$element_has_translations = apply_filters( 'wpml_element_has_translations', null, $element_id, $element_type );
	$element_is_master        = apply_filters( 'wpml_master_post_from_duplicate', $element_id );
	$element_is_duplicate     = apply_filters( 'wpml_post_duplicates', $element_id );

	if ( $element_has_translations ) {
		$translation_type = WPML_ELEMENT_IS_TRANSLATED;
		if ( $element_is_master ) {
			$translation_type = WPML_ELEMENT_IS_A_DUPLICATE;
		} elseif ( $element_is_duplicate ) {
			$translation_type = WPML_ELEMENT_IS_DUPLICATED;
		}
	}

	return $translation_type;
}

/**
 * Accepts the ID of a post and returns its translation type.
 * Values will be one of these:
 *      WPML_ELEMENT_IS_NOT_TRANSLATED  = 0
 *      WPML_ELEMENT_IS_TRANSLATED      = 1
 *      WPML_ELEMENT_IS_DUPLICATED      = 2
 *      WPML_ELEMENT_IS_A_DUPLICATE     = 3
 *
 * @param int $post_id The ID of the post from which to get translation information
 *
 * @return int
 * @internal   param string $post_type
 * @since      3.2
 * @deprecated 3.2 use 'wpml_element_translation_type' filter instead
 */
function wpml_get_post_translation_type( $post_id ) {
	$translation_type = WPML_ELEMENT_IS_NOT_TRANSLATED;

	$post_type = get_post_type( $post_id );
	if ( $post_type && wpml_post_has_translations( $post_id, $post_type ) ) {
		$translation_type = WPML_ELEMENT_IS_TRANSLATED;
		if ( wpml_get_master_post_from_duplicate( $post_id ) ) {
			$translation_type = WPML_ELEMENT_IS_A_DUPLICATE;
		} elseif ( wpml_get_post_duplicates( $post_id ) ) {
			$translation_type = WPML_ELEMENT_IS_DUPLICATED;
		}
	}

	return $translation_type;
}

/**
 * @param int    $post_id
 * @param string $post_type
 *
 * @return bool
 * @since      3.2
 * @deprecated 3.2 use 'wpml_element_has_translations' filter instead
 */
function wpml_post_has_translations( $post_id, $post_type = 'post' ) {
	$has_translations = false;
	global $sitepress;
	if ( isset( $sitepress ) ) {
		$trid         = $sitepress->get_element_trid( $post_id, 'post_' . $post_type );
		$translations = $sitepress->get_element_translations( $trid );
		if ( $translations && count( $translations ) > 1 ) {
			$has_translations = true;
		}
	}

	return $has_translations;
}

/**
 * Checks if an element has translations
 * A translation can be a manual translation or a duplication.
 *
 * @since 3.2
 *
 * @param mixed  $empty_value
 *
 * @see   \wpml_get_active_languages_filter
 *
 * @param int    $element_id    Use term_id for taxonomies, post_id for posts
 * @param string $element_type  Can be a post type: post, page, attachment, nav_menu_item, {custom post key}
 *                              or taxonomy: category, post_tag, nav_menu {custom taxonomy key}
 *
 * @return bool
 * @uses  \SitePress::api_hooks
 */
function wpml_element_has_translations_filter( $empty_value, $element_id, $element_type = 'post' ) {
	$has_translations = false;
	global $sitepress;
	if ( isset( $sitepress ) ) {
		$wpml_element_type = apply_filters( 'wpml_element_type', $element_type );

		if ( strpos( $wpml_element_type, 'tax_' ) === 0 ) {
			/** @var WPML_Term_Translation $wpml_term_translations*/
			global $wpml_term_translations;
			$element_id = $wpml_term_translations->adjust_ttid_for_term_id( $element_id );
		}

		$trid = $sitepress->get_element_trid( $element_id, $wpml_element_type );

		$translations = apply_filters( 'wpml_get_element_translations_filter', '', $trid, $wpml_element_type );

		if ( $translations && count( $translations ) > 1 ) {
			$has_translations = true;
		}
	}

	return $has_translations;
}

function wpml_get_content_translations_filter( $empty, $post_id, $content_type = 'post' ) {
	global $sitepress;
	$translations = array();
	if ( isset( $sitepress ) ) {
		$wpml_element_type = apply_filters( 'wpml_element_type', $content_type );

		$trid = $sitepress->get_element_trid( $post_id, $wpml_element_type );

		$translations = apply_filters( 'wpml_get_element_translations', null, $trid, $wpml_element_type );
	}

	return $translations;
}

/**
 * @param int $post_id
 *
 * @return mixed
 * @since      3.2
 * @deprecated 3.2 use 'wpml_master_post_from_duplicate' filter instead
 */
function wpml_get_master_post_from_duplicate( $post_id ) {
	return get_post_meta( $post_id, '_icl_lang_duplicate_of', true );
}

/**
 * Get the original post from the duplicated post
 *
 * @param int $post_id The duplicated post ID
 *
 * @return int or empty string if there is nothing to return
 * @uses \SitePress::api_hooks
 */
function wpml_get_master_post_from_duplicate_filter( $post_id ) {
	return get_post_meta( $post_id, '_icl_lang_duplicate_of', true );
}

/**
 * @param int $master_post_id
 *
 * @return mixed
 * @since      3.2
 * @deprecated 3.2 use 'wpml_post_duplicates' filter instead
 */
function wpml_get_post_duplicates( $master_post_id ) {
	global $sitepress;
	if ( isset( $sitepress ) ) {
		return $sitepress->get_duplicates( $master_post_id );
	}

	return array();
}

/**
 * Get the duplicated post ids
 * Will return an associative array with language codes as indexes and post_ids as values
 *
 * @param int $master_post_id The original post id from which duplicates exist
 *
 * @return array
 * @uses \SitePress::api_hooks
 */
function wpml_get_post_duplicates_filter( $master_post_id ) {
	global $sitepress;
	if ( isset( $sitepress ) ) {
		return $sitepress->get_duplicates( $master_post_id );
	}

	return array();
}

/**
 * Filters a WordPress element by adding the WPML prefix 'post_', 'tax_', or nothing for 'comment' as used in icl_translations db table
 *
 * @since 3.2
 *
 * @param string $element_type    Accepts comment, post, page, attachment, nav_menu_item, {custom post key},
 *                                nav_menu, category, post_tag, {custom taxonomy key}
 *
 * @return string
 * @uses  \SitePress::api_hooks
 */
function wpml_element_type_filter( $element_type ) {
	global $wp_post_types, $wp_taxonomies;

	$post_types = array_keys( (array) $wp_post_types );
	$taxonomies = array_keys( (array) $wp_taxonomies );

	if ( in_array( $element_type, $taxonomies ) ) {
		$wpml_element_type = 'tax_' . $element_type;
	} elseif ( in_array( $element_type, $post_types ) ) {
		$wpml_element_type = 'post_' . $element_type;
	} else {
		$wpml_element_type = $element_type;
	}

	return $wpml_element_type;
}

/**
 * Retrieves language information for a translatable element
 * Checks icl_translations db table and returns an object with the element's
 * trid, source language code and language code
 *
 * @since                             3.2.2
 *
 * @param mixed $element_object       A WordPress object.
 * @param array $args                 {
 *                                    Required An array of arguments to be used
 *
 * @type int    $element_id           Use term_taxonomy_id for taxonomies, post_id for posts
 * @type string $element_type         Can be a post type: post, page, attachment, nav_menu_item, {custom post key}
 *                                    or taxonomy: category, post_tag, nav_menu {custom taxonomy key}
 *                                    }
 * @return object
 * @uses                              \SitePress::api_hooks
 */
function wpml_element_language_details_filter( $element_object, $args ) {
	global $sitepress;
	if ( isset( $sitepress ) ) {
		$element_type   = apply_filters( 'wpml_element_type', $args['element_type'] );
		$element_object = $sitepress->get_element_language_details( $args['element_id'], $element_type );
	}

	return $element_object;
}

/**
 * Retrieves the language code for a translatable element
 * Checks icl_translations db table and returns the element's language code
 *
 * @since                             3.2.2
 *
 * @param mixed $language_code        A 2-letter language code.
 * @param array $args                 {
 *                                    Required An array of arguments to be used
 *
 * @type int    $element_id           Use term_taxonomy_id for taxonomies, post_id for posts
 * @type string $element_type         Can be a post type: post, page, attachment, nav_menu_item, {custom post key}
 *                                    or taxonomy: category, post_tag, nav_menu {custom taxonomy key}
 *                                    }
 * @return string
 * @uses                              \SitePress::api_hooks
 */
function wpml_element_language_code_filter( $language_code, $args ) {
	global $sitepress;
	if ( isset( $sitepress ) ) {
		$element_type = apply_filters( 'wpml_element_type', $args['element_type'] );

		$language_code = $sitepress->get_language_for_element( $args['element_id'], $element_type );
	}

	return $language_code;
}

/**
 * Retrieves the elements without translations
 * Queries the database and returns an array with ids
 *
 * @since                             3.2.2
 *
 * @param array $element_ids          An array of element ids.
 * @param array $args                 {
 *                                    Required An array of arguments to be used
 *
 * @type string $target_language      The target language code
 * @type string $source_language      The source language code
 * @type string $element_type         Can be a post type: post, page, attachment, nav_menu_item, {custom post key}
 *                                    or taxonomy: category, post_tag, nav_menu {custom taxonomy key}
 *                                    }
 * @return array
 * @uses                              \SitePress::api_hooks
 */
function wpml_elements_without_translations_filter( $element_ids, $args ) {
	global $sitepress;
	if ( isset( $sitepress ) ) {
		$element_type = apply_filters( 'wpml_element_type', $args['element_type'] );
		$element_ids  = $sitepress->get_elements_without_translations( $element_type, $args['target_language'], $args['source_language'] );
	}
	return $element_ids;
}

/**
 * @deprecated Use the filter hook `wpml_permalink` instead
 *
 * Filters a WordPress permalink and converts it to a language specific permalink based on plugin settings
 *
 * @since 3.2.2
 *
 * @param string      $url           The WordPress generated url to filter
 * @param null|string $language_code if null, it falls back to default language for root page,
 *                                   or current language in all other cases.
 *
 * @return string
 */
function wpml_permalink_filter( $url, $language_code = null ) {
	return apply_filters( 'wpml_permalink', $url, $language_code );
}

/**
 * Switches WPML's query language
 *
 * @since                           3.2.2
 * @type null|string $language_code The language code to switch  to
 *                                  If set to null it restores the original language
 *                                  If set to 'all' it will query content from all active languages
 *                                  Defaults to null
 * @uses                            \SitePress::api_hooks
 */
function wpml_switch_language_action( $language_code = null ) {
	global $sitepress;

	$sitepress->switch_lang( $language_code, true );
}