<?php
/**
 * Handles limitations to disk space
 *
 * @todo We need to move posts on downgrade.
 * @package WP_Ultimo
 * @subpackage Limits
 * @since 2.0.0
 */

namespace WP_Ultimo\Limits;

use WP_Ultimo\Checkout\Checkout;

// Exit if accessed directly
defined('ABSPATH') || exit;

/**
 * Handles limitations to post types, uploads and more.
 *
 * @since 2.0.0
 */
class Site_Template_Limits {

	use \WP_Ultimo\Traits\Singleton;

	/**
	 * Runs on the first and only instantiation.
	 *
	 * @since 2.0.0
	 * @return void
	 */
	public function init(): void {

		add_action('plugins_loaded', [$this, 'setup']);
	}

	/**
	 * Sets up the hooks and checks.
	 *
	 * @since 2.0.0
	 * @return void
	 */
	public function setup(): void {

		add_filter('wu_template_selection_render_attributes', [$this, 'maybe_filter_template_selection_options']);

		add_filter('wu_checkout_template_id', [$this, 'maybe_force_template_selection'], 10, 2);

		add_filter('wu_cart_get_extra_params', [$this, 'maybe_force_template_selection_on_cart'], 10, 2);
	}

	/**
	 * Maybe filter the template selection options on the template selection field.
	 *
	 * @since 2.0.0
	 *
	 * @param array $attributes The template rendering attributes.
	 * @return array
	 */
	public function maybe_filter_template_selection_options($attributes) {

		$attributes['should_display'] = true;

		$products = array_map('wu_get_product', wu_get_isset($attributes, 'products', []));

		$products = array_filter($products);

		if ( ! empty($products)) {
			$limits = new \WP_Ultimo\Objects\Limitations();

			[$plan, $additional_products] = wu_segregate_products($products);

			$products = array_merge([$plan], $additional_products);

			foreach ($products as $product) {
				$limits = $limits->merge($product->get_limitations());
			}

			if ($limits->site_templates->get_mode() === 'default') {
				$attributes['sites'] = wu_get_isset($attributes, 'sites', explode(',', ($attributes['template_selection_sites'] ?? '')));

				return $attributes;
			} elseif ($limits->site_templates->get_mode() === 'assign_template') {
				$attributes['should_display'] = false;
			} else {
				$site_list = wu_get_isset($attributes, 'sites', explode(',', ($attributes['template_selection_sites'] ?? '')));

				$available_templates = $limits->site_templates->get_available_site_templates();
				$attributes['sites'] = array_intersect($site_list, $available_templates);
			}
		}

		return $attributes;
	}

	/**
	 * Decides if we need to force the selection of a given template during the site creation.
	 *
	 * @since 2.0.0
	 *
	 * @param int                          $template_id The current template id.
	 * @param \WP_Ultimo\Models\Membership $membership The membership object.
	 * @return int
	 */
	public function maybe_force_template_selection($template_id, $membership) {

		if ($membership && $membership->get_limitations()->site_templates->get_mode() === 'assign_template') {
			$template_id = $membership->get_limitations()->site_templates->get_pre_selected_site_template();
		}

		return $template_id;
	}

	/**
	 * Pre-selects a given template on the checkout screen depending on permissions.
	 *
	 * @since 2.0.0
	 *
	 * @param array                    $extra List if extra elements.
	 * @param \WP_Ultimo\Checkout\Cart $cart The cart object.
	 * @return array
	 */
	public function maybe_force_template_selection_on_cart($extra, $cart) {

		$limits = new \WP_Ultimo\Objects\Limitations();

		$products = $cart->get_all_products();

		[$plan, $additional_products] = wu_segregate_products($products);

		$products = array_merge([$plan], $additional_products);

		$products = array_filter($products);

		foreach ($products as $product) {
			$limits = $limits->merge($product->get_limitations());
		}

		if ($limits->site_templates->get_mode() === 'assign_template') {
			$extra['template_id'] = $limits->site_templates->get_pre_selected_site_template();
		} elseif ($limits->site_templates->get_mode() === 'choose_available_templates') {
			$template_id = Checkout::get_instance()->request_or_session('template_id');

			$extra['template_id'] = $this->is_template_available($products, $template_id) ? $template_id : false;
		}

		return $extra;
	}

	/**
	 * Check if site template is available in current limits
	 *
	 * @param array $products    the list of products to check for limit.
	 * @param int   $template_id the site template id.
	 * @return boolean
	 */
	protected function is_template_available($products, $template_id) {

		$template_id = (int) $template_id;

		if ( ! empty($products)) {
			$limits = new \WP_Ultimo\Objects\Limitations();

			[$plan, $additional_products] = wu_segregate_products($products);

			$products = array_merge([$plan], $additional_products);

			foreach ($products as $product) {
				$limits = $limits->merge($product->get_limitations());
			}

			if ($limits->site_templates->get_mode() === 'assign_template') {
				return $limits->site_templates->get_pre_selected_site_template() === $template_id;
			} else {
				$available_templates = $limits->site_templates->get_available_site_templates();

				return in_array($template_id, $available_templates, true);
			}
		}

		return true;
	}
}
