<?php
/**
 * LearnDash Settings Section for Stripe Connect.
 *
 * @since   4.0.0
 * @package \LearnDash\Settings\Sections
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( ( class_exists( 'LearnDash_Settings_Section' ) ) && ( ! class_exists( 'LearnDash_Settings_Section_Stripe_Connect' ) ) ) {
	/**
	 * Class LearnDash Settings Section for Stripe Connect.
	 *
	 * @since 4.0.0
	 */
	class LearnDash_Settings_Section_Stripe_Connect extends LearnDash_Settings_Section {
		const CONNECT_SERVER_URL = 'https://connect.learndash.com/stripe/connect.php';

		const STRIPE_RETURNED_SUCCESS               = 1;
		const STRIPE_RETURNED_AND_PROCESSED_SUCCESS = 2;

		const STRIPE_CUSTOMER_ID_META_KEY      = 'stripe_connect_customer_id';
		const STRIPE_CUSTOMER_ID_META_KEY_TEST = 'stripe_connect_test_customer_id';


		/**
		 * Protected constructor for class
		 *
		 * @since 4.0.0
		 */
		protected function __construct() {
			$this->settings_page_id = 'learndash_lms_payments';

			// This is the 'option_name' key used in the wp_options table.
			$this->setting_option_key = 'learndash_stripe_connection_settings';

			// This is the HTML form field prefix used.
			$this->setting_field_prefix = 'learndash_stripe_connection_settings';

			// Used within the Settings API to uniquely identify this section.
			$this->settings_section_key = 'settings_stripe_connection';

			// Section label/header.
			$this->settings_section_label = esc_html__( 'Stripe Connect Settings', 'learndash' );

			// Used to associate this section with the parent section.
			$this->settings_parent_section_key = 'settings_payments_list';

			$this->settings_section_listing_label = esc_html__( 'Stripe Connect', 'learndash' );

			parent::__construct();

			$this->handle_connection_request();
			$this->handle_disconnection_request();

			add_action( 'admin_notices', array( $this, 'show_notices' ) );
		}

		/**
		 * Initialize the metabox settings values.
		 *
		 * @since 4.0.0
		 */
		public function load_settings_values() {
			parent::load_settings_values();

			if ( ! isset( $this->setting_option_values['payment_methods'] ) ) {
				$this->setting_option_values['payment_methods'] = array( 'card' );
			}

			if ( ! isset( $this->setting_option_values['test_mode'] ) ) {
				$this->setting_option_values['test_mode'] = '';
			}
		}

		/**
		 * Get the default webhook url.
		 *
		 * @return string
		 */
		public static function get_default_stripe_webhook_url() {
			return add_query_arg(
				array( 'learndash-integration' => 'stripe-connect' ),
				esc_url_raw( get_site_url() )
			);
		}

		/**
		 * Get the stripe webhook URL.
		 *
		 * @since 4.0.0
		 */
		private function get_stripe_webhook_url() {
			if ( isset( $this->setting_option_values['webhook_url'] ) && ! empty( $this->setting_option_values['webhook_url'] ) ) {
				return $this->setting_option_values['webhook_url'];
			}

			return self::get_default_stripe_webhook_url();
		}

		/**
		 * Initialize the metabox settings fields.
		 *
		 * @since 4.0.0
		 */
		public function load_settings_fields() {
			$this->setting_option_fields = array(
				'connection_button'    => array(
					'name'             => 'connection_button',
					'type'             => 'text',
					'label'            => '',
					'value'            => null,
					'display_callback' => array( $this, 'connection_button' ),
				),
				'enabled'              => array(
					'name'    => 'enabled',
					'type'    => 'checkbox-switch',
					'label'   => esc_html__( 'Active', 'learndash' ),
					'value'   => $this->setting_option_values['enabled'] ?? '',
					'options' => array(
						'yes' => '',
						''    => '',
					),
				),
				'test_mode'            => array(
					'name'      => 'test_mode',
					'label'     => esc_html__( 'Test Mode', 'learndash' ),
					'help_text' => esc_html__( 'Check this box to enable test mode.', 'learndash' ),
					'type'      => 'checkbox-switch',
					'options'   => array(
						'1' => '',
						'0' => '',
					),
					'default'   => '',
					'value'     => $this->setting_option_values['test_mode'] ?? 0,
				),
				'publishable_key_test' => array(
					'name'      => 'publishable_key_test',
					'label'     => __( 'Test Publishable Key', 'learndash' ),
					'help_text' => __( 'Test publishable key used in test mode.', 'learndash' ),
					'type'      => 'hidden',
					'value'     => $this->setting_option_values['publishable_key_test'] ?? '',
				),
				'secret_key_test'      => array(
					'name'      => 'secret_key_test',
					'label'     => __( 'Test Secret Key', 'learndash' ),
					'help_text' => __( 'Test secret key used in test mode.', 'learndash' ),
					'type'      => 'hidden',
					'value'     => $this->setting_option_values['secret_key_test'] ?? '',
				),
				'publishable_key_live' => array(
					'name'      => 'publishable_key_live',
					'label'     => __( 'Live Publishable Key', 'learndash' ),
					'help_text' => __( 'Live publishable key used in real transaction.', 'learndash' ),
					'type'      => 'hidden',
					'value'     => $this->setting_option_values['publishable_key_live'] ?? '',
				),
				'secret_key_live'      => array(
					'name'      => 'secret_key_live',
					'label'     => __( 'Live Secret Key', 'learndash' ),
					'help_text' => __( 'Live secret key used in real transaction.', 'learndash' ),
					'type'      => 'hidden',
					'value'     => $this->setting_option_values['secret_key_live'] ?? '',
				),
				'account_id'           => array(
					'name'  => 'account_id',
					'label' => __( 'Account Id', 'learndash' ),
					'type'  => 'hidden',
					'value' => $this->setting_option_values['account_id'] ?? '',
				),
				'payment_methods'      => array(
					'name'      => 'payment_methods',
					'label'     => __( 'Payment Methods', 'learndash' ),
					'help_text' => __( 'Stripe payment methods to be enabled on the site.', 'learndash' ),
					'value'     => $this->setting_option_values['payment_methods'],
					'type'      => 'checkbox',
					'options'   => array(
						'card'  => __( 'Credit Card', 'learndash' ),
						'ideal' => __( 'Ideal', 'learndash' ),
					),
				),
				'return_url'           => array(
					'name'      => 'return_url',
					'label'     => __( 'Return URL ', 'learndash' ),
					'help_text' => __(
						'Redirect the user to a specific URL after the purchase. Leave blank to let user remain on the Course page.',
						'learndash'
					),
					'type'      => 'text',
					'value'     => $this->setting_option_values['return_url'] ?? '',
				),
				'webhook_url'          => array(
					'name'      => 'webhook_url',
					'type'      => 'text',
					'label'     => esc_html__( 'Webhook URL', 'learndash' ),
					'help_text' => esc_html__( 'Stripe webhook endpoint. You have to add this URL in the webhooks section of your Stripe Dashboard.', 'learndash' ),
					'value'     => $this->get_stripe_webhook_url(),
					'class'     => 'regular-text',
				),
			);

			/** This filter is documented in includes/settings/settings-metaboxes/class-ld-settings-metabox-course-access-settings.php */
			$this->setting_option_fields = apply_filters( 'learndash_settings_fields', $this->setting_option_fields, $this->settings_section_key );

			parent::load_settings_fields();
		}

		/**
		 * Filter the section saved values.
		 *
		 * @param array  $value An array of setting fields values.
		 * @param array  $old_value An array of setting fields old values.
		 * @param string $settings_section_key Settings section key.
		 * @param string $settings_screen_id Settings screen ID.
		 *
		 * @return array
		 * @since 4.0.0
		 */
		public function filter_section_save_fields( $value, $old_value, $settings_section_key, $settings_screen_id ): array {
			if ( $settings_section_key !== $this->settings_section_key ) {
				return $value;
			}

			if ( ! isset( $value['enabled'] ) ) {
				$value['enabled'] = '';
			}

			if ( ! isset( $value['payment_methods'] ) ) {
				$value['payment_methods'] = array();
			}

			if ( isset( $_POST['learndash_settings_payments_list_nonce'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification
				if ( ! is_array( $old_value ) ) {
					$old_value = array();
				}

				foreach ( $value as $value_idx => $value_val ) {
					$old_value[ $value_idx ] = $value_val;
				}

				$value = $old_value;
			}

			return $value;
		}

		/**
		 * Show notices.
		 */
		public function show_notices() {
			// Show Stripe disconnection error.
			if ( ! empty( $_GET['ld_stripe_error'] ) && ! empty( $_GET['error_code'] ) && ! empty ( $_GET['error_message'] ) ) { // phpcs:ignore
				?>
				<div class="notice notice-error is-dismissible">
					<p>
						<b>
							<?php esc_html_e( 'Stripe Error', 'learndash' ); ?>:
						</b>
						<?php esc_html_e( $_GET['error_message'] ); // phpcs:ignore ?>
					</p>
				</div>
				<?php
			}

			// Show Stripe connection success and endpoint webhook requirement.
			// TODO: Add webhook url via API.
			if (
				isset( $_GET['ld_stripe_connected'] ) && self::STRIPE_RETURNED_AND_PROCESSED_SUCCESS === intval( $_GET['ld_stripe_connected'] ) && // phpcs:ignore
				$this->account_is_connected()
			) {
				$webhook_title         = esc_html__(
					'You are connected! Please configure your Stripe webhook to finalize the setup.',
					'learndash'
				);
				$webhook_first_detail  = sprintf(
					'%1$s %2$s',
					__(
						'In order for Stripe to function properly, you must add a new Stripe webhook endpoint. To do this please visit the <a href=\'https://dashboard.stripe.com/webhooks\' target=\'_blank\'>Webhooks Section of your Stripe Dashboard</a> and click the <strong>Add endpoint</strong> button and paste the following URL:',
						'learndash'
					),
					"<strong>{$this->get_stripe_webhook_url()}</strong>"
				);
				$webhook_second_detail = esc_html__(
					'Stripe webhooks are required so LearnDash can communicate properly with the payment gateway to confirm payment completion, renewals, and more.',
					'learndash'
				);
				?>
				<div class="notice notice-info is-dismissible" style="">
					<h1><?php echo $webhook_title; // phpcs:ignore ?></h1>
					<p><?php echo $webhook_first_detail; // phpcs:ignore ?></p>
					<p><?php echo $webhook_second_detail; // phpcs:ignore ?></p>
				</div>
				<?php
			}

			// Show Stripe disconnection success.
			if ( isset( $_GET['ld_stripe_disconnected'] ) && self::STRIPE_RETURNED_AND_PROCESSED_SUCCESS === intval( $_GET['ld_stripe_disconnected'] ) ) { // phpcs:ignore
				?>
				<div class="notice notice-success is-dismissible">
					<p>
						<?php esc_html_e( 'Stripe disconnected', 'learndash' ); ?>.
					</p>
				</div>
				<?php
			}

			// Show Stripe Connect button.
			if ( $this->is_on_payments_setting_page() && ! $this->account_is_connected() ) {
				?>
				<div class="notice connect-stripe" style="display: flex; justify-content: space-between; padding: 20px 25px;">
					<h1>
						<?php esc_html_e( 'Want to accept credit card payments directly on your website?', 'learndash' ); ?>
					</h1>
					<?php $this->connection_button(); ?>
				</div>
				<?php
			}
		}

		/**
		 * Shows Stripe Connect button
		 */
		public function connection_button(): void {
			if ( $this->account_is_connected() ) :
				?>
				<a href="<?php echo esc_url( $this->generate_disconnect_url() ); ?>"
					class="learndash-stripe-connect" title="<?php esc_html_e( 'Disconnect Stripe', 'learndash' ); ?>">
					<span class="stripe-logo">
						<svg width="15" height="21" viewBox="0 0 15 21" fill="none"
							xmlns="http://www.w3.org/2000/svg">
							<path d="M6.05469 6.55469C6.05469 5.69531 6.75781 5.34375 7.92969 5.34375C9.64844 5.34375 11.7969 5.85156 13.4766 6.78906V1.55469C11.6406 0.8125 9.80469 0.5 7.92969 0.5C3.4375 0.5 0.429688 2.88281 0.429688 6.82812C0.429688 13 8.86719 11.9844 8.86719 14.6406C8.86719 15.6953 7.96875 16.0078 6.75781 16.0078C4.88281 16.0078 2.5 15.2656 0.664062 14.25V19.25C2.5 20.0703 4.57031 20.5 6.75781 20.5391C11.3672 20.5391 14.5703 18.5469 14.5703 14.5234C14.5703 7.88281 6.05469 9.05469 6.05469 6.55469Z"
								fill="white"></path>
						</svg>
					</span>
					<span>
						<?php esc_html_e( 'Disconnect Stripe', 'learndash' ); ?>
					</span>
				</a>
				<?php
			else :
				?>
				<a href="<?php echo esc_url( self::generate_connect_url() ); ?>"
					class="learndash-stripe-connect" title="<?php esc_html_e( 'Connect Stripe', 'learndash' ); ?>">
					<span class="stripe-logo">
						<svg width="15" height="21" viewBox="0 0 15 21" fill="none"
							xmlns="http://www.w3.org/2000/svg">
							<path d="M6.05469 6.55469C6.05469 5.69531 6.75781 5.34375 7.92969 5.34375C9.64844 5.34375 11.7969 5.85156 13.4766 6.78906V1.55469C11.6406 0.8125 9.80469 0.5 7.92969 0.5C3.4375 0.5 0.429688 2.88281 0.429688 6.82812C0.429688 13 8.86719 11.9844 8.86719 14.6406C8.86719 15.6953 7.96875 16.0078 6.75781 16.0078C4.88281 16.0078 2.5 15.2656 0.664062 14.25V19.25C2.5 20.0703 4.57031 20.5 6.75781 20.5391C11.3672 20.5391 14.5703 18.5469 14.5703 14.5234C14.5703 7.88281 6.05469 9.05469 6.05469 6.55469Z"
								fill="white"></path>
						</svg>
					</span>
					<span>
						<?php esc_html_e( 'Connect Stripe', 'learndash' ); ?>
					</span>
				</a>
				<?php
			endif;
		}

		/**
		 * Checks if account is already connected.
		 *
		 * @return bool
		 */
		private function account_is_connected(): bool {
			return ! empty( $this->setting_option_values['account_id'] );
		}

		/**
		 * Checks if payments settings is a current page.
		 *
		 * @return bool
		 */
		private function is_on_payments_setting_page(): bool {
			return isset( $_GET['page'] ) && 'learndash_lms_payments' === $_GET['page']; // phpcs:ignore
		}

		/**
		 * Generates a connect url.
		 *
		 * @param string $return_url The url to return to after connection. Defaults to the current page.
		 *
		 * @return string
		 */
		public static function generate_connect_url( $return_url = '' ): string {
			$args = array(
				'stripe_action' => 'connect',
				'return_url'    => rawurlencode( empty( $return_url ) ? home_url() . add_query_arg( array() ) : $return_url ),
			);

			return add_query_arg(
				$args,
				esc_url_raw( self::CONNECT_SERVER_URL )
			);
		}

		/**
		 * Generates Stripe disconnect url.
		 *
		 * @return string
		 */
		private function generate_disconnect_url(): string {
			$args = array(
				'stripe_action'  => 'disconnect',
				'stripe_user_id' => $this->setting_option_values['account_id'],
				'return_url'     => rawurlencode( home_url() . add_query_arg( array() ) ),
			);

			return add_query_arg(
				$args,
				esc_url_raw( self::CONNECT_SERVER_URL )
			);
		}

		/**
		 * Clean up Stripe Connect customer_id metadata from users.
		 */
		private function cleanup_stripe_connect_customer_id() {
			global $wpdb;
			$sql = $wpdb->prepare(
				"DELETE FROM $wpdb->usermeta
								WHERE meta_key IN ( %s, %s )",
				self::STRIPE_CUSTOMER_ID_META_KEY,
				self::STRIPE_CUSTOMER_ID_META_KEY_TEST
			);
			$wpdb->query( $sql ); // phpcs:ignore
		}

		/**
		 * Handle connection.
		 */
		private function handle_connection_request(): void {
			if (
				current_user_can( 'manage_options' ) &&
			  	isset( $_GET['ld_stripe_connected'] ) && self::STRIPE_RETURNED_SUCCESS === intval( $_GET['ld_stripe_connected'] ) // phpcs:ignore
			) {
				$this->load_settings_values();

				// check if account connected is same of last time.
				$old_account_id = isset( $this->setting_option_values['last_account_id'] ) ? $this->setting_option_values['last_account_id'] : '';
				$new_account_id = isset( $_GET['stripe_user_id'] ) ? sanitize_text_field( wp_unslash( $_GET['stripe_user_id'] ) ) : ''; // phpcs:ignore WordPress.Security.NonceVerification.Recommended
				if ( $old_account_id !== $new_account_id ) {
					// clear customer_id metadata from users.
					$this->cleanup_stripe_connect_customer_id();
				}

				$this->setting_option_values['account_id']           = sanitize_text_field( $_GET['stripe_user_id'] ); // phpcs:ignore
				$this->setting_option_values['secret_key_live']      = sanitize_text_field( $_GET['stripe_access_token'] ); // phpcs:ignore
				$this->setting_option_values['secret_key_test']      = sanitize_text_field( $_GET['stripe_access_token_test'] ); // phpcs:ignore
				$this->setting_option_values['publishable_key_live'] = sanitize_text_field( $_GET['stripe_publishable_key'] ); // phpcs:ignore
				$this->setting_option_values['publishable_key_test'] = sanitize_text_field( $_GET['stripe_publishable_key_test'] ); // phpcs:ignore

				$this->save_settings_values();

				$reload_url = remove_query_arg(
					array( 'ld_stripe_connected', 'ld_stripe_disconnected', 'stripe_user_id', 'stripe_access_token', 'stripe_access_token_test', 'stripe_publishable_key', 'stripe_publishable_key_test', 'ld_stripe_error', 'error_code', 'error_message' )
				);
				$reload_url = add_query_arg(
					array( 'ld_stripe_connected' => self::STRIPE_RETURNED_AND_PROCESSED_SUCCESS ),
					$reload_url
				);

				learndash_safe_redirect( $reload_url );
			}
		}

		/**
		 * Handle disconnection.
		 */
		private function handle_disconnection_request(): void {
			if (
				current_user_can( 'manage_options' ) &&
				( isset( $_GET['ld_stripe_disconnected'] ) && self::STRIPE_RETURNED_SUCCESS === intval( $_GET['ld_stripe_disconnected'] ) )
				||
				( current_user_can( 'manage_options' ) && isset( $_GET['ld_stripe_error'] ) && 1 === intval( $_GET['ld_stripe_error'] ) && ! isset( $_GET['ld_stripe_disconnected'] ) ) // phpcs:ignore WordPress.Security.NonceVerification.Recommended
			) {
				$this->load_settings_values();

				$this->setting_option_values['last_account_id']      = isset( $this->setting_option_values['account_id'] ) ? $this->setting_option_values['account_id'] : '';
				$this->setting_option_values['account_id']           = '';
				$this->setting_option_values['publishable_key_live'] = '';
				$this->setting_option_values['secret_key_live']      = '';
				$this->setting_option_values['publishable_key_test'] = '';
				$this->setting_option_values['secret_key_test']      = '';

				$this->save_settings_values();

				$reload_url = remove_query_arg( array( 'ld_stripe_connected' ) );
				$reload_url = add_query_arg(
					array( 'ld_stripe_disconnected' => self::STRIPE_RETURNED_AND_PROCESSED_SUCCESS ),
					$reload_url
				);

				learndash_safe_redirect( $reload_url );
			}
		}

		/**
		 * Check if Stripe is connected.
		 *
		 * @return boolean true if connected, false otherwise.
		 */
		public static function is_stripe_connected(): bool {
			$options = LearnDash_Settings_Section::get_section_settings_all( 'LearnDash_Settings_Section_Stripe_Connect' );
			return ( isset( $options['account_id'] ) && ! empty( $options['account_id'] ) );
		}

		/**
		 * Return the stripe Webhook notice
		 *
		 * @return string
		 */
		public static function get_stripe_webhook_notice() {
			$options     = LearnDash_Settings_Section::get_section_settings_all( 'LearnDash_Settings_Section_Stripe_Connect' );
			$webhook_url = isset( $options['webhook_url'] ) ? $options['webhook_url'] : self::get_default_stripe_webhook_url();
			return sprintf(
				'%1$s %2$s',
				__(
					'In order for Stripe to function properly, you must add a new Stripe webhook endpoint. To do this please visit the <a href=\'https://dashboard.stripe.com/webhooks\' target=\'_blank\'>Webhooks Section of your Stripe Dashboard</a> and click the <strong>Add endpoint</strong> button and paste the following URL:',
					'learndash'
				),
				"<strong>{$webhook_url}</strong>"
			);
		}
	}

	add_action(
		'learndash_settings_sections_init',
		array( LearnDash_Settings_Section_Stripe_Connect::class, 'add_section_instance' )
	);
}