<?php
/**
 * Contact Form 7 events: one per form; the form's field names are the template variables.
 *
 * @package Smsportal
 */

namespace Smsportal\Integrations;

use Smsportal\Events;

defined( 'ABSPATH' ) || exit;

/**
 * A sent form as an SMS event. The customer's number comes from the field chosen in the rule
 * (rule field phone_field); a "customer" rule without that choice sends nothing.
 */
class ContactForm7 {

	const GROUP = 'Contact Form 7';

	const EVENT_PREFIX = 'cf7.submitted.';

	const OBJECT_TYPE = 'cf7_form';

	/**
	 * Submission statuses that mean "the form was sent" (an e-mail failure on the site does not stop the SMS).
	 */
	const SENT_STATUSES = array( 'mail_sent', 'mail_failed' );

	/**
	 * Context keys of our own (prefixed so they cannot clash with field names).
	 */
	const KEY_FORM = '_smsportal_form_id';
	const KEY_HASH = '_smsportal_submission';

	/**
	 * Whether Contact Form 7 is active.
	 *
	 * @return bool
	 */
	public static function available(): bool {
		return class_exists( 'WPCF7_ContactForm' ) && class_exists( 'WPCF7_Submission' );
	}

	/**
	 * Register hooks.
	 *
	 * @return void
	 */
	public static function register(): void {
		add_filter( 'smsportal_register_events', array( self::class, 'events' ) );
		add_action( 'wpcf7_submit', array( self::class, 'submitted' ), 20, 2 );
	}

	/**
	 * Add one event per form.
	 *
	 * @param mixed $events Events so far.
	 * @return array<int,array<string,mixed>>
	 */
	public static function events( $events ): array {
		$events = is_array( $events ) ? $events : array();
		foreach ( \WPCF7_ContactForm::find() as $form ) {
			$events[] = self::event( $form );
		}
		return $events;
	}

	/**
	 * Hook: a form was submitted.
	 *
	 * @param mixed $form   Contact form.
	 * @param mixed $result Submission result.
	 * @return void
	 */
	public static function submitted( $form, $result ): void {
		if ( ! $form instanceof \WPCF7_ContactForm ) {
			return;
		}
		$event_id = self::EVENT_PREFIX . $form->id();
		try {
			$status     = is_array( $result ) ? (string) ( $result['status'] ?? '' ) : '';
			$submission = \WPCF7_Submission::get_instance();
			if ( ! in_array( $status, self::SENT_STATUSES, true ) || ! $submission instanceof \WPCF7_Submission ) {
				return;
			}
			Events::fire( $event_id, self::context( $form, $submission ) );
		} catch ( \Throwable $e ) {
			Events::report( $e, $event_id );
		}
	}

	/**
	 * Event of one form.
	 *
	 * @param \WPCF7_ContactForm $form Form.
	 * @return array<string,mixed>
	 */
	private static function event( \WPCF7_ContactForm $form ): array {
		$fields  = self::fields( $form );
		$form_id = (int) $form->id();
		return array(
			'id'             => self::EVENT_PREFIX . $form_id,
			/* translators: %s: form title. */
			'label'          => sprintf( __( 'Contact Form 7: form "%s" sent', '85pl-android-sms-api' ), $form->title() ),
			'group'          => self::GROUP,
			'icon'           => SMSPORTAL_URL_BASE . 'assets/integrations/contact-form-7.png',
			'variables'      => array_combine( array_keys( $fields ), array_keys( $fields ) ),
			'customer_phone' => static function ( array $context, array $rule = array() ) {
				$field = (string) ( $rule['phone_field'] ?? '' );
				$phone = '' !== $field ? ( $context[ $field ] ?? null ) : null;
				return is_string( $phone ) && '' !== trim( $phone ) ? $phone : null;
			},
			'object'         => static function ( array $context ) use ( $form_id ): array {
				$hash = (string) ( $context[ self::KEY_HASH ] ?? '' );
				return array(
					'type' => self::OBJECT_TYPE,
					// One SMS per submission: CF7's hash covers the data, sender and a half-hour window.
					'id'   => '' === $hash ? '' : $form_id . '-' . $hash,
					'url'  => admin_url( 'admin.php?page=wpcf7&action=edit&post=' . $form_id ),
				);
			},
			// CF7 does not store submissions, so there is nothing to preview.
			'sample'         => null,
			'rule_fields'    => array( 'phone_field' ),
		);
	}

	/**
	 * Named fields of a form.
	 *
	 * @param \WPCF7_ContactForm $form Form.
	 * @return array<string,string> Field name => field type (e.g. "tel").
	 */
	private static function fields( \WPCF7_ContactForm $form ): array {
		$fields = array();
		foreach ( $form->scan_form_tags() as $tag ) {
			$name = (string) $tag->name;
			if ( '' !== $name && ! isset( $fields[ $name ] ) ) {
				$fields[ $name ] = (string) $tag->basetype;
			}
		}
		return $fields;
	}

	/**
	 * Submitted values as template variables (lists joined with commas).
	 *
	 * @param \WPCF7_ContactForm $form       Form.
	 * @param \WPCF7_Submission  $submission Submission.
	 * @return array<string,mixed>
	 */
	private static function context( \WPCF7_ContactForm $form, \WPCF7_Submission $submission ): array {
		$context = array();
		foreach ( (array) $submission->get_posted_data() as $name => $value ) {
			if ( is_array( $value ) ) {
				$value = implode( ', ', array_filter( array_map( 'strval', array_filter( $value, 'is_scalar' ) ), 'strlen' ) );
			}
			if ( is_scalar( $value ) ) {
				$context[ (string) $name ] = (string) $value;
			}
		}
		$context[ self::KEY_FORM ] = (int) $form->id();
		$context[ self::KEY_HASH ] = (string) $submission->get_posted_data_hash();
		return $context;
	}
}