<?php

if (!class_exists('AdminBackButton')) {
	// Add Back Buttons to Edit Screens in the WordPress Admin [SnipSnip.pro] - https://snipsnip.pro/s/39
	// https://codesnippets.cloud/snippet/brandonjp/AdminBackButton
    class AdminBackButton
    {
        public function __construct()
        {
            if (is_admin() && current_user_can('manage_options')) {
                add_action('admin_footer', array($this, 'add_script_to_page'));
            }
        }

        public function add_script_to_page()
        {
            global $pagenow;

            $pages = array(
                'admin.php',
                'edit-tags.php',
                'user-new.php',
                'user-edit.php',
                'profile.php',
                'plugin-install.php',
                'media-new.php',
                'comment.php',
                'post.php',
                'term.php',
                'post-new.php',
            );

            if (in_array($pagenow, $pages)) {
?>

<script type="text/javascript">    
(function ($) {

/**
 * Add Back Buttons to Edit Screens in the WordPress Admin - AdminBackButton [SnipSnip.pro] - https://snipsnip.pro/s/39
 * The button attempts to correclty link to the parent, list or previous screen as applicable.
 * Author: brandonjp.com
 * Version: 2023-10-19
 */

  class AdminBackButton {
    constructor(config) {
      this.config = {
        backButtonClass: 'page-title-action customBackBtn',
        backButtonIcon: '‹',
        delay: 1500,
        styles: '',
        ...config,
      };
    }

    init() {
      $(document).ready(() => {
        if (window.jQuery) {
          this.addTheBackButtonDelayed();
        }
      });
    }

    addTheBackButtonDelayed() {
      setTimeout(() => {
        this.addTheBackButton();
      }, this.config.delay);
    }

    addTheBackButton() {
      const phpFile = this.getFileName();
      const $currentParent = $('#adminmenu > li').filter('.current, .wp-has-current-submenu');
      const $currentItem = $currentParent.find('ul.wp-submenu li.current').first() || $currentParent;
      const $firstItem = $currentParent.find('ul.wp-submenu li.wp-first-item').first() || $currentParent;
      const $newTarget = this.getTarget($currentItem, $firstItem, phpFile);

      if ($newTarget && $newTarget.length) {
        this.addBackButtonToHeader($newTarget);
      }
    }

    getFileName() {
      const pathArray = window.location.pathname.split('/');
      return pathArray[pathArray.length - 1];
    }

    getTarget($currentItem, $firstItem, phpFile) {
      if (this.config.filesWithConditionalDirection.includes(phpFile)) {
        const currentScreenSearch = window.location.search;
        const currentItemSearch = $currentItem.find('a').attr('href').split('php')[1];
        if (currentScreenSearch && currentItemSearch && currentScreenSearch === currentItemSearch) {
          this.config.filesGoingToCurrent.push(phpFile);
        } else {
          this.config.filesGoingToFirst.push(phpFile);
        }
      }
      return this.config.filesGoingToCurrent.includes(phpFile) ? $currentItem : this.config.filesGoingToFirst.includes(phpFile) ? $firstItem : undefined;
    }

    addBackButtonToHeader($newTarget) {
      const newHref = $newTarget.find('a').attr('href');
      const currentScreenHref = window.location.href.split('/').pop();
      const newHrefIsUnique = newHref && newHref.length && newHref !== currentScreenHref;

      if (newHrefIsUnique) {
        const newTitle = $newTarget.text().trim();
        const $heading = $('div.wrap > h1').first();
        const $newBtn = $('<a>', {
          href: newHref,
          title: newTitle,
          class: this.config.backButtonClass,
          text: this.config.backButtonIcon,
        });
        $heading.prepend($newBtn);
        console.log('Snippet: Add Back Buttons to Edit Screens in the WordPress Admin - AdminBackButton [SnipSnip.pro] - https://snipsnip.pro/s/39');
      }

      if (this.config.styles) {
        const $styleTag = $('<style>', {
          html: `.${this.config.backButtonClass.split(' ').join('.')} { ${this.config.styles} }`,
        });
        $('head').append($styleTag);
      }
    }
  }

  const adminBackButton = new AdminBackButton({
    filesGoingToFirst: [
      'admin.php',
      'edit-tags.php',
      'user-new.php',
      'user-edit.php',
      'profile.php',
      'plugin-install.php',
      'media-new.php',
      'comment.php',
    ],
    filesGoingToCurrent: [
      'post.php',
      'term.php',
    ],
    filesWithConditionalDirection: ['post-new.php'],
    backButtonClass: 'page-title-action customBackBtn',
    backButtonIcon: '‹',
    delay: 1500,
    styles: 'margin: 0 4px; border-radius: 3px;',
  });

  adminBackButton.init();
})(jQuery);
    
</script>

<?php
            }
        }
    }

    $adminBackButton = new AdminBackButton();
}