<?php
/**
 * admin-ajax handlers for the Custom fields card on the Settings screen.
 *
 * The list and every change go through the platform (/api/v1/plugin/custom-fields),
 * because the same choices are edited from the web app and the Shopify app and
 * must hold everywhere. The local option is refreshed from each response, so the
 * very next sync already honours a change.
 *
 * @package Agencoen
 */

namespace Agencoen;

defined( 'ABSPATH' ) || exit;

/**
 * Class Ajax_Custom_Fields
 */
class Ajax_Custom_Fields extends Ajax_Base {

	/** Changes the card can make. */
	const INTENTS = array( 'exclude', 'include', 'rewrite-on', 'rewrite-off' );

	/**
	 * Register the actions.
	 */
	public function register() {
		add_action( 'wp_ajax_agencoen_custom_fields_list', array( $this, 'list_fields' ) );
		add_action( 'wp_ajax_agencoen_custom_fields_update', array( $this, 'update_field' ) );
	}

	/**
	 * The store's custom fields as the platform lists them.
	 */
	public function list_fields() {
		check_ajax_referer( self::NONCE_ACTION, 'nonce' );
		$this->require_manage();
		$this->require_connected();

		$result = $this->plugin->api()->custom_fields( $this->plugin->settings()->get_store_id() );
		if ( is_wp_error( $result ) ) {
			wp_send_json_error( $this->error_payload( $result ) );
		}
		wp_send_json_success(
			array(
				'fields' => isset( $result['fields'] ) && is_array( $result['fields'] ) ? $result['fields'] : array(),
			)
		);
	}

	/**
	 * Leave a field out, use it again, or allow or stop rewriting it.
	 */
	public function update_field() {
		check_ajax_referer( self::NONCE_ACTION, 'nonce' );
		$this->require_manage();
		$this->require_connected();

		$intent = isset( $_POST['intent'] ) ? sanitize_key( wp_unslash( $_POST['intent'] ) ) : '';
		$id     = isset( $_POST['id'] ) ? sanitize_text_field( wp_unslash( $_POST['id'] ) ) : '';
		$label  = isset( $_POST['label'] ) ? sanitize_text_field( wp_unslash( $_POST['label'] ) ) : '';
		if ( ! in_array( $intent, self::INTENTS, true ) || '' === $id ) {
			wp_send_json_error( array( 'message' => __( 'That change was not recognised.', 'agentic-commerce-engine' ) ) );
		}

		$patch = array();
		if ( 'exclude' === $intent ) {
			$patch['exclude'] = array(
				array(
					'id'    => $id,
					'label' => $label,
				),
			);
		} elseif ( 'include' === $intent ) {
			$patch['include'] = array( $id );
		} elseif ( 'rewrite-on' === $intent ) {
			$patch['rewriteOn'] = array( $id );
		} else {
			$patch['rewriteOff'] = array( $id );
		}

		$settings = $this->plugin->settings();
		$result   = $this->plugin->api()->update_custom_fields( $settings->get_store_id(), $patch );
		if ( is_wp_error( $result ) ) {
			wp_send_json_error( $this->error_payload( $result ) );
		}

		// Mirror the exclusions locally so the next sync honours them, and
		// re-send a field brought back: it was stripped when it was left out.
		$changed = $settings->save_custom_fields(
			array(
				'revision' => isset( $result['revision'] ) ? $result['revision'] : 0,
				'excluded' => isset( $result['excluded'] ) && is_array( $result['excluded'] ) ? $result['excluded'] : array(),
			)
		);
		if ( 'include' === $intent && $changed && ! wp_next_scheduled( Cron::CATALOG_RESYNC ) ) {
			wp_schedule_single_event( time() + MINUTE_IN_SECONDS, Cron::CATALOG_RESYNC );
		}

		wp_send_json_success(
			array(
				'fields'       => isset( $result['fields'] ) && is_array( $result['fields'] ) ? $result['fields'] : array(),
				'resyncNeeded' => ! empty( $result['resyncNeeded'] ),
			)
		);
	}
}