<?php

namespace LearnPress\CourseBuilder;

use LearnPress\Helpers\Config;
use LearnPress\Models\UserModel;
use LP_Settings;
use WP_Query;

/**
 * Course Builder class.
 *
 * @since 4.3.0
 * @version 1.0.0
 */
class CourseBuilder {
	/**
	 * Constant for new post identifier
	 */
	const POST_NEW                    = 'new';
	const QUERY_VAR_IS_COURSE_BUILDER = 'is_course_builder';
	const QUERY_VAR_ITEM_ID           = 'lp_cb_item_id';
	const QUERY_VAR_MENU_SLUG         = 'lp_cb_menu_slug';

	/**
	 *  Constructor
	 *
	 */
	protected function __construct() {
	}

	/**
	 * Get menus structure default in course builder.
	 *
	 * @return array
	 * @since 4.3.6
	 * @version 1.0.0
	 */
	public static function get_menus_arr(): array {
		return Config::instance()->get( 'menus', 'course-builder' );
	}

	/**
	 * Get the current menu slug for the Course Builder page.
	 *
	 * Retrieves the active menu slug from the WP_Query object based on the 'lp_cb_menu_slug' query variable.
	 *
	 * @return string The current menu slug.
	 *
	 * @since 4.3.6
	 * @version 1.0.0
	 */
	public static function get_menu_current(): string {
		/** @var WP_Query $wp_query */
		global $wp_query;
		return (string) $wp_query->get( 'lp_cb_menu_slug', 'dashboard' );
	}

	/**
	 * Get the current section being viewed in a course builder tab.
	 * @param string $current
	 * @param string $tab
	 * @return string
	 *
	 * @since 4.3.0
	 * @version 1.0.0
	 */
	public static function get_current_section( $current = '', $tab = '' ) {
		global $wp;

		if ( empty( $_REQUEST[ self::QUERY_VAR_ITEM_ID ] ) && empty( $wp->query_vars[ self::QUERY_VAR_ITEM_ID ] ) ) {
			return $current;
		}

		if ( ! empty( $_REQUEST['section'] ) ) {
			$current = sanitize_text_field( $_REQUEST['section'] );
		} elseif ( ! empty( $wp->query_vars['section'] ) ) {
			$current = $wp->query_vars['section'];
		} else {
			if ( ! $tab ) {
				$current_tab = self::get_menu_current();
			} else {
				$current_tab = $tab;
			}
			$tab_data = self::get_data( $current_tab );

			if ( ! empty( $tab_data['sections'] ) ) {
				$sections = $tab_data['sections'];
				$section  = reset( $sections );
				if ( ! empty( $section['slug'] ) ) {
					$current = $section['slug'];
				} else {
					$current = array_keys( $tab_data['sections'] );
				}
			}
		}

		return $current;
	}

	/**
	 * Retrieves tabs data or a specific tab by key.
	 *
	 * @param string|bool
	 * @return array
	 *
	 * @since 4.3.0
	 * @version 1.0.0
	 */
	public static function get_data( $key = false ) {
		$tabs = self::get_menus_arr();
		return false !== $key ? ( array_key_exists( $key, $tabs ) ? $tabs[ $key ] : [] ) : $tabs;
	}

	/**
	 * Get link for course builder
	 *
	 * @param string $sub
	 *
	 * @return string
	 */
	public static function get_link_course_builder( string $sub = '' ): string {
		$page = LP_Settings::get_option( 'course_builder', 'course-builder' );
		return home_url( "{$page}/{$sub}" );
	}

	/**
	 * Get link for add new an item.
	 *
	 * @param $type
	 *
	 * @return string
	 */
	public static function get_link_add_new( $type ): string {
		return self::get_link_course_builder( "{$type}/create" );
	}

	/**
	 * Get tab link
	 *
	 * @param string|false $tab
	 * @param int|string|null $post_id
	 * @param string|false $section
	 *
	 * @return string
	 *
	 * @since 4.3.0
	 * @version 1.0.0
	 */
	public static function get_tab_link( $tab = false, $post_id = null, $section = false ): string {
		$link = '';
		if ( ! $tab ) {
			return $link;
		}

		$link = self::get_link_course_builder();

		if ( ! empty( $tab ) ) {
			$link .= $tab . '/';
		}

		if ( ! empty( $post_id ) ) {
			$link .= $post_id . '/';
		}

		if ( ! empty( $section ) ) {
			$link .= $section . '/';
		}

		return $link;
	}

	/**
	 * Get item id
	 *
	 * @return int|string
	 *
	 * @since 4.3.6
	 * @version 1.0.0
	 */
	public static function get_item_id() {
		/** @var WP_Query $wp_query */
		global $wp_query;

		return $wp_query->get( self::QUERY_VAR_ITEM_ID );
	}

	/**
	 * Get permission to view course builder
	 *
	 * @return bool
	 */
	public static function can_view_course_builder(): bool {
		$userModel = UserModel::find( get_current_user_id(), true );
		return $userModel && $userModel->is_instructor();
	}

	/**
	 * Get title page of course builder
	 *
	 * @return string
	 * @since 4.3.6
	 * @version 1.0.0
	 */
	public static function get_title_page(): string {
		/** @var WP_Query $wp_query */
		global $wp_query;
		$title = '';

		$menu_current = self::get_menu_current();
		$menus        = self::get_menus_arr();
		if ( isset( $menus[ $menu_current ] ) ) {
			$title = $menus[ $menu_current ]['title'] ?? '';

			$post_id = CourseBuilder::get_item_id();
			if ( ! empty( $post_id ) ) {
				if ( $post_id === self::POST_NEW ) {
					$title .= ' - ' . __( 'New', 'learnpress' );
				} else {
					$post = get_post( $post_id );
					if ( $post ) {
						$title = sprintf( __( 'Edit "%1$s" - %2$s', 'learnpress' ), $post->post_title, $title );
					}
				}
			}
		}

		return $title;
	}
}