<?php
/**
 * Best-effort authenticated deactivation evidence for connected sites.
 *
 * The existing deactivation-feedback UI remains optional and independent. The
 * registered WordPress deactivation hook sends this minimal event for plugin-
 * screen, bulk, network and command-line deactivation paths.
 *
 * @package abtestkit
 */

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

define( 'ABTESTKIT_CONNECTED_DEACTIVATION_OPTION', 'abtestkit_connected_deactivation_event' );

/** Remove the prior deactivation marker when the plugin is activated again. */
function abtestkit_connected_deactivation_reset() : void {
    delete_option( ABTESTKIT_CONNECTED_DEACTIVATION_OPTION );
}

/**
 * Reserve one immutable event so optional feedback and the hook share an ID.
 *
 * @return array<string,mixed>|null
 */
function abtestkit_connected_deactivation_prepare() : ?array {
    if ( ! abtestkit_connected_platform_can_create_or_launch() ) {
        return null;
    }
    $connection = abtestkit_hosted_get_connection();
    if ( ! is_array( $connection ) ) {
        return null;
    }
    $site_ref = (string) $connection['site_ref'];

    $stored = get_option( ABTESTKIT_CONNECTED_DEACTIVATION_OPTION, null );
    if (
        is_array( $stored ) &&
        is_string( $stored['site_ref'] ?? null ) &&
        hash_equals( $site_ref, $stored['site_ref'] ) &&
        is_array( $stored['event'] ?? null ) &&
        ! is_wp_error( ABTestKit_Connected_Event::validate( $stored['event'], time() ) )
    ) {
        return $stored;
    }

    $installation = ABTestKit_Connected_Installation::get_or_create();
    $event_id = ABTestKit_Connected_Event::new_id();
    if ( is_wp_error( $installation ) || is_wp_error( $event_id ) ) {
        return null;
    }

    $event = array(
        'schema_version' => 1,
        'event_id' => $event_id,
        'installation_id' => (string) $installation['installation_id'],
        'event_name' => 'plugin_deactivated',
        'occurred_at' => time(),
        'plugin_version' => abtestkit_hosted_sync_plugin_version(),
        'test_ref' => null,
        'payload' => array( 'evidence' => 'observed' ),
    );
    if ( is_wp_error( ABTestKit_Connected_Event::validate( $event, time() ) ) ) {
        return null;
    }

    $marker = array(
        'event' => $event,
        'site_ref' => $site_ref,
        'attempted_at' => 0,
        'accepted' => false,
    );
    update_option( ABTESTKIT_CONNECTED_DEACTIVATION_OPTION, $marker, false );
    $stored = get_option( ABTESTKIT_CONNECTED_DEACTIVATION_OPTION, null );

    return is_array( $stored ) ? $stored : null;
}

/**
 * Send the minimal event directly because cron stops when the plugin becomes
 * inactive. A failed or ambiguous attempt is queued for later reactivation.
 */
function abtestkit_connected_deactivation_send() : bool {
    $connection = abtestkit_hosted_get_connection();
    $marker = abtestkit_connected_deactivation_prepare();
    if ( ! is_array( $connection ) || ! is_array( $marker ) || ! is_array( $marker['event'] ?? null ) ) {
        return false;
    }

    $event = $marker['event'];
    $installation = ABTestKit_Connected_Installation::get_or_create();
    if (
        is_wp_error( $installation ) ||
        is_wp_error( ABTestKit_Connected_Event::validate( $event, time() ) ) ||
        ! is_string( $marker['site_ref'] ?? null ) ||
        ! hash_equals( (string) $connection['site_ref'], $marker['site_ref'] ) ||
        ! hash_equals( (string) $installation['installation_id'], (string) ( $event['installation_id'] ?? '' ) )
    ) {
        return false;
    }
    if ( ! empty( $marker['accepted'] ) ) {
        return true;
    }

    $marker['attempted_at'] = time();
    update_option( ABTESTKIT_CONNECTED_DEACTIVATION_OPTION, $marker, false );

    $response = abtestkit_hosted_service_request(
        'POST',
        '/sites/' . (string) $connection['site_ref'] . '/events',
        array(
            'schema_version' => 1,
            'installation' => array(
                'installation_id' => (string) $installation['installation_id'],
                'home_url' => (string) $installation['home_url'],
                'environment' => (string) $installation['environment'],
                'created_at' => (int) $installation['created_at'],
            ),
            'events' => array( $event ),
        ),
        (string) $connection['credential'],
        2
    );

    if ( is_wp_error( $response ) || ! in_array( (int) $response['status'], array( 200, 202 ), true ) ) {
        if ( 1 === (int) get_option( ABTestKit_Connected_Outbox::SCHEMA_OPTION, 0 ) ) {
            ABTestKit_Connected_Outbox::enqueue( $event, time() );
        }
        return false;
    }
    $data = $response['data'];
    $accepted = is_int( $data['accepted'] ?? null ) ? $data['accepted'] : -1;
    $duplicates = is_int( $data['duplicates'] ?? null ) ? $data['duplicates'] : -1;
    if ( 1 !== $accepted + $duplicates ) {
        if ( 1 === (int) get_option( ABTestKit_Connected_Outbox::SCHEMA_OPTION, 0 ) ) {
            ABTestKit_Connected_Outbox::enqueue( $event, time() );
        }
        return false;
    }

    $marker['accepted'] = true;
    update_option( ABTESTKIT_CONNECTED_DEACTIVATION_OPTION, $marker, false );
    return true;
}