<?php
namespace Consiva\Consent\Integrations\Forms;

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

use Consiva\Consent\Consent\ServerConsent;

/**
 * Contact Form 7 adapter (Plugin §10.2).
 *
 * Adds the opt-in just before the submit button (wpcf7_form_elements) and records it once CF7 has
 * validated the submission and judged it not spam (wpcf7_before_send_mail).
 */
final class ContactForm7 implements AdapterInterface {

	/**
	 * @return string
	 */
	public function id() {
		return 'contact-form-7';
	}

	/**
	 * @return string
	 */
	public function label() {
		return 'Contact Form 7';
	}

	/**
	 * @return bool
	 */
	public function is_available() {
		return defined( 'WPCF7_VERSION' ) && class_exists( 'WPCF7_ContactForm' );
	}

	/**
	 * @return string
	 */
	public function version() {
		return defined( 'WPCF7_VERSION' ) ? (string) WPCF7_VERSION : '';
	}

	/**
	 * @return array<int,array{id:int,title:string}>
	 */
	public function discover_forms() {
		return Registry::published_forms( 'wpcf7_contact_form' );
	}

	/**
	 * @return void
	 */
	public function register_hooks() {
		add_filter( 'wpcf7_form_elements', array( $this, 'inject' ) );
		add_action( 'wpcf7_before_send_mail', array( $this, 'capture' ), 10, 3 );
	}

	/**
	 * @param string $html Form elements HTML.
	 * @return string
	 */
	public function inject( $html ) {
		$form = \WPCF7_ContactForm::get_current();
		if ( ! $form || ! ServerConsent::form_enabled( $this->id(), $form->id() ) ) {
			return $html;
		}
		$field  = ServerConsent::checkbox_html( $this->id(), (int) $form->id() );
		$submit = strpos( $html, 'wpcf7-submit' );
		if ( false === $submit ) {
			return $html . $field;
		}
		// Put the opt-in on its own line above the element that contains the submit button.
		$start = strrpos( substr( $html, 0, $submit ), '<p' );
		$start = false === $start ? strrpos( substr( $html, 0, $submit ), '<input' ) : $start;
		return false === $start ? $html . $field : substr( $html, 0, $start ) . $field . substr( $html, $start );
	}

	/**
	 * @param \WPCF7_ContactForm $form       Form.
	 * @param bool               $abort      Whether sending was aborted (by reference in CF7).
	 * @param \WPCF7_Submission  $submission Submission.
	 * @return void
	 */
	public function capture( $form, $abort = false, $submission = null ) {
		if ( $abort || ! $submission || ! ServerConsent::form_enabled( $this->id(), $form->id() ) ) {
			return;
		}
		if ( '1' !== (string) $submission->get_posted_data( ServerConsent::FIELD ) ) {
			return; // Box left unticked: no consent, nothing recorded.
		}
		ServerConsent::record( 'form', $this->id(), 'cf7:' . $form->id() . ' ' . $form->title(), ServerConsent::form_options( $this->id(), (int) $form->id() )['label'], null, (int) $form->id() );
	}
}