<?php
/**
 * AIsoule API Client.
 *
 * Handles HTTP requests to the AIsoule Cloud API.
 *
 * @package AIsoule_Connect
 */

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

class AIsoule_API {

	/**
	 * Single instance of AIsoule_API.
	 *
	 * @var AIsoule_API|null
	 */
	private static $instance = null;

	/**
	 * Accessor.
	 *
	 * @return AIsoule_API
	 */
	public static function instance() {
		if ( is_null( self::$instance ) ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Get the API base URL.
	 *
	 * @return string
	 */
	public function get_api_base_url() {
		$options = get_option( 'aisoule_whatsapp_settings', array() );
		$url     = ! empty( $options['api_url'] ) ? trim( $options['api_url'] ) : AISOULE_DEFAULT_API_URL;
		return untrailingslashit( $url );
	}

	/**
	 * Get the API Key.
	 *
	 * @return string
	 */
	public function get_api_key() {
		$options = get_option( 'aisoule_whatsapp_settings', array() );
		return ! empty( $options['api_key'] ) ? trim( $options['api_key'] ) : '';
	}

	/**
	 * Get the Webhook Secret / Organization ID.
	 *
	 * @return string
	 */
	public function get_org_id() {
		$options = get_option( 'aisoule_whatsapp_settings', array() );
		return ! empty( $options['org_id'] ) ? trim( $options['org_id'] ) : '';
	}

	/**
	 * Send an event payload to AIsoule.
	 *
	 * @param string $event   Event name (e.g., 'order_created', 'order_status_update', 'abandoned_cart').
	 * @param array  $payload Associated event data.
	 * @return array|WP_Error
	 */
	public function send_event( $event, $payload ) {
		$api_key = $this->get_api_key();
		if ( empty( $api_key ) ) {
			return new WP_Error( 'missing_api_key', __( 'AIsoule API Key is not configured.', 'aisoule-connect' ) );
		}

		$endpoint = $this->get_api_base_url() . '/integrations/woocommerce/events';

		$body = array(
			'event'           => sanitize_key( $event ),
			'organization_id' => $this->get_org_id(),
			'site_url'        => get_site_url(),
			'timestamp'       => current_time( 'timestamp' ),
			'data'            => $payload,
		);

		$args = array(
			'method'      => 'POST',
			'timeout'     => 10,
			'redirection' => 5,
			'httpversion' => '1.1',
			'blocking'    => false, // Non-blocking during checkout to prevent slowdowns
			'headers'     => array(
				'Content-Type'  => 'application/json; charset=utf-8',
				'Authorization' => 'Bearer ' . $api_key,
				'X-API-Key'     => $api_key,
				'X-Source'      => 'aisoule-connect/' . AISOULE_VERSION,
			),
			'body'        => wp_json_encode( $body ),
			'sslverify'   => true,
		);

		return wp_remote_post( $endpoint, $args );
	}

	/**
	 * Test connection to AIsoule API.
	 *
	 * @param string $api_key Optional API key to test.
	 * @return bool|WP_Error
	 */
	public function test_connection( $api_key = '' ) {
		if ( empty( $api_key ) ) {
			$api_key = $this->get_api_key();
		}

		if ( empty( $api_key ) ) {
			return new WP_Error( 'empty_key', __( 'Please provide an API key.', 'aisoule-connect' ) );
		}

		$endpoint = $this->get_api_base_url() . '/me';

		$response = wp_remote_get(
			$endpoint,
			array(
				'timeout'   => 15,
				'headers'   => array(
					'Authorization' => 'Bearer ' . $api_key,
					'X-API-Key'     => $api_key,
					'User-Agent'    => 'AIsoule-Connect/' . AISOULE_VERSION,
				),
				'sslverify' => true,
			)
		);

		if ( is_wp_error( $response ) ) {
			return $response;
		}

		$code = wp_remote_retrieve_response_code( $response );
		if ( 200 === $code || 204 === $code ) {
			return true;
		}

		/* translators: %d: HTTP response status code */
		return new WP_Error( 'invalid_response', sprintf( __( 'API returned HTTP code: %d', 'aisoule-connect' ), $code ) );
	}
}