<?php

declare( strict_types = 1 );

namespace Automattic\WooCommerce\Internal\StockNotifications\Admin;

use Automattic\WooCommerce\Internal\StockNotifications\Config;
use Automattic\WooCommerce\Internal\StockNotifications\Frontend\MyAccountEndpoint;

/**
 * Settings controller for Customer Stock Notifications.
 */
class SettingsController {

	/**
	 * Constructor.
	 */
	public function __construct() {

		// Add a 'Customer stock notifications' section to Products settings.
		add_filter( 'woocommerce_get_sections_products', array( $this, 'add_customer_stock_notifications_section' ), 100, 1 );

		// Add the Customer Stock Notifications settings.
		add_filter( 'woocommerce_get_settings_products', array( $this, 'add_customer_stock_notifications_settings' ), 100, 2 );

		// Add the My Account endpoint setting to the Advanced tab.
		add_filter( 'woocommerce_get_settings_advanced', array( $this, 'add_my_account_endpoint_setting' ), 100, 2 );

		add_filter( 'woocommerce_admin_settings_sanitize_option_woocommerce_customer_stock_notifications_unverified_deletions_days_threshold', array( $this, 'sanitize_unverified_deletion_days_threshold' ) );

		// The product edit hooks stay admin-only: process_product_object() reads $_POST and
		// checks an admin nonce, so it must not run for cron or CLI code that fires the hook.
		if ( ! is_admin() ) {
			return;
		}

		// Display admin notices about incompatible settings combinations.
		add_action( 'admin_notices', array( $this, 'output_admin_notices' ) );

		// Display and save product-level stock notifications option.
		add_action( 'woocommerce_product_options_stock_status', array( $this, 'add_disable_stock_notifications_checkbox' ), 20 );
		add_action( 'woocommerce_admin_process_product_object', array( $this, 'process_product_object' ) );
	}

	/**
	 * Add the stock notifications endpoint setting to Settings > Advanced > Account endpoints.
	 *
	 * Sits with the core account endpoints rather than in the feature's own section, since
	 * everything that reads it is the endpoint plumbing core owns. Unlike the core entries it
	 * only shows while the feature is enabled, because this controller loads with the feature.
	 *
	 * @param array  $settings   Original settings.
	 * @param string $section_id Settings section identifier.
	 * @return array New settings.
	 */
	public function add_my_account_endpoint_setting( $settings, $section_id ) {

		if ( ! is_array( $settings ) ) {
			return $settings;
		}

		if ( '' !== $section_id ) {
			return $settings;
		}

		$setting = array(
			'title'    => __( 'Stock notifications', 'woocommerce' ),
			'desc'     => __( 'Endpoint for the "My account &rarr; Stock notifications" page.', 'woocommerce' ),
			'id'       => MyAccountEndpoint::ENDPOINT_OPTION,
			'type'     => 'text',
			'default'  => MyAccountEndpoint::ENDPOINT,
			'desc_tip' => true,
		);

		// Slot it right after Downloads so it sits with the other list endpoints,
		// otherwise before Logout so Logout stays last, otherwise at the end of the group.
		$position = 0;
		foreach ( array_values( $settings ) as $index => $field ) {
			if ( ! is_array( $field ) || ! isset( $field['id'] ) ) {
				continue;
			}
			if ( 'woocommerce_myaccount_downloads_endpoint' === $field['id'] ) {
				$position = $index + 1;
				break;
			}
			if ( 'woocommerce_logout_endpoint' === $field['id'] || ( 'account_endpoint_options' === $field['id'] && 'sectionend' === ( $field['type'] ?? '' ) ) ) {
				$position = $index;
				break;
			}
		}

		if ( 0 === $position ) {
			return $settings;
		}

		array_splice( $settings, $position, 0, array( $setting ) );

		return $settings;
	}

	/**
	 * Add a 'Customer stock notifications' section to Products settings.
	 *
	 * @param array $sections Products settings sections.
	 * @return array New Products settings sections.
	 */
	public function add_customer_stock_notifications_section( $sections ) {
		if ( ! is_array( $sections ) ) {
			return $sections;
		}

		$section_title = __( 'Customer stock notifications', 'woocommerce' );

		// Add 'Customer stock notifications' section to the Products tab, after Inventory.
		$inventory_index = array_search( 'inventory', array_keys( $sections ), true );
		if ( false !== $inventory_index ) {
			$sections = array_slice( $sections, 0, $inventory_index + 1, true ) +
				array( 'customer_stock_notifications' => $section_title ) +
				array_slice( $sections, $inventory_index + 1, null, true );
		} else {
			$sections['customer_stock_notifications'] = $section_title;
		}

		return $sections;
	}

	/**
	 * Add the Customer Stock Notifications settings.
	 *
	 * @param array  $settings Original settings.
	 * @param string $section_id Settings section identifier.
	 * @return array New settings.
	 */
	public function add_customer_stock_notifications_settings( $settings, $section_id ) {

		if ( ! is_array( $settings ) ) {
			return $settings;
		}

		if ( 'customer_stock_notifications' !== $section_id ) {
			return $settings;
		}

		/**
		 * Filter the Customer Stock Notifications settings.
		 *
		 * @since 10.2.0
		 *
		 * @param array $default_customer_stock_notifications_settings The default Customer Stock Notifications settings.
		 */
		$stock_notification_settings = apply_filters(
			'woocommerce_customer_stock_notifications_settings',
			array(

				array(
					'title' => __( 'Customer stock notifications', 'woocommerce' ),
					'type'  => 'title',
					'desc'  => '',
					'id'    => 'product_customer_stock_notifications_options',
				),

				array(
					'title'   => __( 'Allow sign-ups', 'woocommerce' ),
					'desc'    => __( 'Let customers sign up to be notified when products in your store are restocked.', 'woocommerce' ),
					'id'      => 'woocommerce_customer_stock_notifications_allow_signups',
					'default' => 'no',
					'type'    => 'checkbox',
				),

				array(
					'title'   => __( 'Require double opt-in to sign up', 'woocommerce' ),
					'desc'    => __( 'To complete the sign-up process, customers must follow a verification link sent to their e-mail after submitting the sign-up form.', 'woocommerce' ),
					'id'      => 'woocommerce_customer_stock_notifications_require_double_opt_in',
					'default' => 'no',
					'type'    => 'checkbox',
				),

				array(
					'title'             => __( 'Delete unverified notification sign-ups after (in days)', 'woocommerce' ),
					'desc'              => __( 'Controls how long unverified notification sign-ups are stored in the database. Enter zero, or leave this field empty, to store unverified sign-up requests indefinitely.', 'woocommerce' ),
					'id'                => 'woocommerce_customer_stock_notifications_unverified_deletions_days_threshold',
					'default'           => Config::get_unverified_deletion_days_threshold(),
					'value'             => Config::get_unverified_deletion_days_threshold(),
					'type'              => 'number',
					'custom_attributes' => array(
						'min'  => 0,
						'step' => 1,
					),
				),

				array(
					'title'    => __( 'Require login', 'woocommerce' ),
					'desc'     => __( 'Customers must be logged in to sign up for stock notifications.', 'woocommerce' ),
					'id'       => 'woocommerce_customer_stock_notifications_require_account',
					'default'  => 'no',
					'type'     => 'checkbox',
					'desc_tip' => __( 'When enabled, guests see a login prompt instead of the sign-up form.', 'woocommerce' ),
				),

				array(
					'type' => 'sectionend',
					'id'   => 'product_customer_stock_notifications_options',
				),
			)
		);

		$settings = array_merge( $settings, $stock_notification_settings );

		return $settings;
	}

	/**
	 * Store negative values of the unverified sign-up deletion threshold as 0, which turns the cleanup off.
	 *
	 * An empty value is kept as is, since it also means off.
	 *
	 * @internal
	 *
	 * @since 11.3.0
	 *
	 * @param mixed $value The value about to be saved.
	 * @return mixed
	 */
	public function sanitize_unverified_deletion_days_threshold( $value ) {
		if ( null === $value || '' === $value ) {
			return $value;
		}

		return max( 0, (int) $value );
	}

	/**
	 * Display admin notices about incompatible settings combinations.
	 *
	 * @return void
	 */
	public function output_admin_notices() {
		// Only show notices on the Customer Stock Notifications settings page.
		$screen = get_current_screen();
		if ( ! $screen || 'woocommerce_page_wc-settings' !== $screen->id || ! isset( $_GET['section'] ) || 'customer_stock_notifications' !== $_GET['section'] ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended
			return;
		}

		if ( 'yes' === get_option( 'woocommerce_hide_out_of_stock_items' ) && Config::allows_signups() ) {
			wp_admin_notice(
				sprintf(
					/* translators: %s settings page link */
					__( 'WooCommerce is currently <a href="%s">configured</a> to hide out-of-stock products from your catalog. Customers will not be able sign up for back-in-stock notifications while this option is enabled.', 'woocommerce' ),
					esc_url( admin_url( 'admin.php?page=wc-settings&tab=products&section=inventory' ) )
				),
				array(
					'id'          => 'message',
					'type'        => 'warning',
					'dismissible' => false,
				)
			);
		}
	}

	/**
	 * Setting to allow admins disabling bis on product level.
	 *
	 * @return void
	 */
	public function add_disable_stock_notifications_checkbox() {

		if ( ! Config::allows_signups() ) {
			return;
		}

		global $product_object;
		if ( ! is_a( $product_object, 'WC_Product' ) ) {
			return;
		}

		$enable_signups = 'no' !== $product_object->get_meta( Config::get_product_signups_meta_key() ) ? 'yes' : 'no';

		wp_nonce_field( 'woocommerce-customer-stock-notifications-edit-product', 'customer_stock_notifications_edit_product_security' );
		woocommerce_wp_checkbox(
			array(
				'id'            => Config::get_product_signups_meta_key(),
				'label'         => __( 'Stock notifications', 'woocommerce' ),
				'value'         => $enable_signups,
				'wrapper_class' => implode(
					' ',
					array_map(
						function ( $type ) {
							return 'show_if_' . $type;
						},
						Config::get_supported_product_types()
					)
				),
				'description'   => __( 'Let customers sign up to be notified when this product is restocked', 'woocommerce' ),
			)
		);
	}

	/**
	 * Save product settings meta.
	 *
	 * @param  WC_Product $product The product object.
	 * @return void
	 */
	public static function process_product_object( $product ) {

		// Without the nonce field the checkbox was not rendered, so there is nothing to save.
		if ( ! isset( $_POST['customer_stock_notifications_edit_product_security'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Missing -- Only checks presence; the nonce is verified before saving.
			return;
		}

		if ( ! Config::allows_signups() ) {
			return;
		}

		if ( ! is_a( $product, 'WC_Product' ) ) {
			return;
		}

		if ( ! $product->is_type( Config::get_supported_product_types() ) ) {
			return;
		}

		$posted_is_enabled = isset( $_POST[ Config::get_product_signups_meta_key() ] );
		$current_enabled   = 'no' !== $product->get_meta( Config::get_product_signups_meta_key() );
		if ( $posted_is_enabled !== $current_enabled ) {
			check_admin_referer( 'woocommerce-customer-stock-notifications-edit-product', 'customer_stock_notifications_edit_product_security' );

			$product->update_meta_data( Config::get_product_signups_meta_key(), $posted_is_enabled ? 'yes' : 'no' );
		}
	}
}