<?php

/**
 * Twilio REST API client for sending SMS.
 *
 * Uses wp_remote_post with Basic Auth. No SDK required.
 *
 * @package AfroIT_Messaging_WorkflowAutomations
 */

namespace AfroIT\Messaging\WorkflowAutomations\Twilio;


use AfroIT\Messaging\WorkflowAutomations\Logging\Log;
use AfroIT\Messaging\WorkflowAutomations\Security\SecureOptions;

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

/**
 * Class TwilioClient
 *
 * Sends SMS via Twilio REST API.
 */
final class TwilioClient {

	private const API_BASE = 'https://api.twilio.com/2010-04-01';

	/**
	 * @var string|null
	 */
	private ?string $account_sid = null;

	/**
	 * @var string|null
	 */
	private ?string $auth_token = null;

	/**
	 * @var string|null
	 */
	private ?string $from_number = null;

	/**
	 * Constructor.
	 *
	 * @param string|null $account_sid Account SID (default from SecureOptions).
	 * @param string|null $auth_token  Auth token (default from SecureOptions).
	 * @param string|null $from_number From phone number (default from settings).
	 */
	public function __construct( ?string $account_sid = null, ?string $auth_token = null, ?string $from_number = null ) {
		if ( null !== $account_sid && null !== $auth_token ) {
			$this->account_sid = $account_sid;
			$this->auth_token  = $auth_token;
		} else {
			$secure = SecureOptions::get_instance();
			$this->account_sid = $secure->get( 'twilio_account_sid', '' ) ?: null;
			$this->auth_token  = $secure->get( 'twilio_auth_token', '' ) ?: null;
		}

		$this->from_number = $from_number ?? ( new TwilioSettings() )->get_from_number();
	}

	/**
	 * Check if client is configured.
	 *
	 * @return bool
	 */
	public function is_configured(): bool {
		return ! empty( $this->account_sid ) && ! empty( $this->auth_token ) && ! empty( $this->from_number );
	}

	/**
	 * Send an SMS message.
	 *
	 * @param string $to   Recipient phone number (E.164 format).
	 * @param string $body Message body.
	 * @return array{success: bool, sid?: string, error?: string}
	 */
	public function sendSms( string $to, string $body ): array {
		if ( ! $this->is_configured() ) {
			Log::error( 'TwilioClient: not configured', array() );
			return array( 'success' => false, 'error' => __( 'Twilio is not configured. Please add Account SID, Auth Token, and From number in settings.', 'afroit-messaging-workflows' ) );
		}

		$to   = $this->normalize_phone( $to );
		$body = trim( $body );

		if ( '' === $to || '' === $body ) {
			return array( 'success' => false, 'error' => __( 'Invalid recipient or message body.', 'afroit-messaging-workflows' ) );
		}

		$url  = self::API_BASE . '/Accounts/' . $this->account_sid . '/Messages.json';
		$auth = base64_encode( $this->account_sid . ':' . $this->auth_token );

		$response = wp_remote_post(
			$url,
			array(
				'headers' => array(
					'Authorization' => 'Basic ' . $auth,
					'Content-Type'  => 'application/x-www-form-urlencoded',
				),
				'body'    => array(
					'To'   => $to,
					'From' => $this->from_number,
					'Body' => $body,
				),
				'timeout' => 25,
			)
		);

		if ( is_wp_error( $response ) ) {
			Log::error( 'TwilioClient: request failed', array( 'error' => $response->get_error_message() ) );
			return array( 'success' => false, 'error' => $response->get_error_message() );
		}

		$code = wp_remote_retrieve_response_code( $response );
		$body_raw = wp_remote_retrieve_body( $response );
		$data = json_decode( $body_raw, true );

		if ( $code >= 200 && $code < 300 && ! empty( $data['sid'] ) ) {
			Log::info( 'TwilioClient: SMS sent', array( 'sid' => $data['sid'] ) );
			return array( 'success' => true, 'sid' => $data['sid'] );
		}

		$error_msg = isset( $data['message'] ) ? $data['message'] : ( isset( $data['error_message'] ) ? $data['error_message'] : __( 'Unknown Twilio error.', 'afroit-messaging-workflows' ) );
		Log::error( 'TwilioClient: send failed', array( 'code' => $code, 'error' => $error_msg ) );
		return array( 'success' => false, 'error' => $error_msg );
	}

	/**
	 * Normalize phone number to E.164 (basic).
	 *
	 * @param string $phone Raw phone.
	 * @return string
	 */
	private function normalize_phone( string $phone ): string {
		$phone = preg_replace( '/[^\d+]/', '', $phone );
		if ( '' !== $phone && '+' !== substr( $phone, 0, 1 ) ) {
			$phone = '+' . $phone;
		}
		return $phone;
	}
}