<?php
/**
 * (C) Copyright 2021 by Kolja Nolte
 * kolja.nolte@gmail.com
 * https://www.kolja-nolte.com
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * @see        https://wordpress.org/plugins/secondary-title/
 * @author     Kolja Nolte <kolja.nolte@gmail.com>
 *
 * This file contains the functions used within the admin area.
 * The code for the plugin's settings page is stored separately within /includes/settings.php.
 *
 * @package    Secondary Title
 * @subpackage Administration
 */

/**
 * Stop script when the file is called directly.
 *
 * @since 0.1.0
 */
if ( ! function_exists( 'add_action' ) ) {
	die( "403 - You are not authorized to view this page." );
}

/**
 * Build the invisible secondary title input on edit pages
 * to let jQuery displaying it (see admin.js).
 *
 * @since 0.1.0
 */
function init_secondary_title_admin_posts(): void {
	$title_input_position = secondary_title_get_setting( 'input_field_position' );

	/** Verify if Secondary Title's settings allow the input box to be displayed */
	if ( ! secondary_title_verify_admin_page() ) {
		return;
	}

	$post_id         = get_the_ID();
	$secondary_title = get_secondary_title( $post_id );
	$input_title     = esc_html( __( 'Enter your secondary title', 'secondary-title' ) );
	?>
	<input type="hidden" id="secondary-title-input-position" value="<?php echo $title_input_position; ?>" />
	<input type="text" size="30" id="secondary-title-input" class="secondary-title-input" placeholder="<?php _e( 'Enter secondary title here', 'secondary-title' ); ?>" name="secondary_post_title" hidden value="<?php echo esc_html( $secondary_title ); ?>" title="<?php echo $input_title; ?>" />
	<?php
}

add_action( 'admin_footer', 'init_secondary_title_admin_posts' );

/**
 * @param array $columns Default columns
 *
 * @return array Modified columns
 *
 * @since 1.9.3
 */
function secondary_title_register_overview_column( array $columns ): array {
	/** Value of the position set on the Secondary Title admin page */
	$column_position_setting = secondary_title_get_setting( 'column_position' );

	/** The first column used to add the offset */
	$first_key = 'cb';

	/** Row ID */
	$column_id = 'secondary_title';

	/** The row title */
	$column_title = __( 'Secondary Title', 'secondary-title' );
	$column_title = [ $column_id => $column_title ];

	/** Set array keys with default columns */
	$keys = array_keys( $columns );

	/** Search for the first key and modifying the position by changing the offset */
	$index = array_search( $first_key, $keys, true );

	/** Default column position */
	$column_position = $index + 1;
	$column_offset   = $column_position;

	/** Display the Secondary Title column on the right if set on the admin page */
	if ( $column_position_setting !== 'left' ) {

		/** Increase offset and adding the column after the "Title" column */
		$column_offset = $column_position + 1;
	}

	/** Slice the first array */
	$column_1 = array_slice(
		$columns,
		0,
		$column_offset
	);

	/** Slice the second array */
	$column_2 = array_slice(
		$columns,
		$column_offset
	);

	/** Combine both arrays */
	$columns = array_merge(
		$column_1,
		$column_title,
		$column_2
	);

	return $columns;
}

/**
 * Initializes the overview columns.
 *
 * @since 1.4.3
 */
function secondary_title_load_overview_columns_hook(): void {
	$activated_post_types = secondary_title_get_setting( 'post_types' );

	if ( ! $activated_post_types ) {
		$activated_post_types = get_post_types();
	}

	$activated_post_types = apply_filters(
		'secondary_title_columns_in_post_types',
		$activated_post_types
	);

	foreach ( $activated_post_types as $post_type ) {
		add_action(
			"manage_{$post_type}s_custom_column",
			'secondary_title_display_overview_column',
			10,
			2
		);

		add_filter(
			"manage_{$post_type}_posts_columns",
			'secondary_title_register_overview_column'
		);
	}
}

add_action( 'admin_init', 'secondary_title_load_overview_columns_hook' );

/**
 * Adds the secondary title to the newly created rows of the secondary title column
 *
 * @param string $column_name Name of the column we want to add the secondary title to
 * @param int    $post_id     ID of the post of the current row
 *
 * @since 1.4.3
 */
function secondary_title_display_overview_column( string $column_name, int $post_id ): void {
	/** Loop through column names */
	switch ( $column_name ) {

		/** If current column name is the secondary title, then... */ case 'secondary_title':
		/** ...the actual secondary title of the post is being fetched */ $post_secondary_title = get_secondary_title( $post_id );

		/** Display the secondary title of the current post within a row */
		echo $post_secondary_title;

		/** Stop the loop */
		break;
	}
}