<?php
/**
 * Plugin Name: WP Microsoft Teams API
 * Plugin URI:  https://example.com/wp-ms-teams-api
 * Description: A WordPress plugin that provides an API wrapper for Microsoft Teams.
 * Version:     1.0.0
 * Author:      Your Name
 * Author URI:  https://example.com
 * License:     GPL2
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain: wp-ms-teams-api
 * Domain Path: /languages
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( ! class_exists( 'WP_MS_Teams_API' ) ) :

	/**
	 * Main WP_MS_Teams_API Class.
	 *
	 * @since 1.0.0
	 */
	final class WP_MS_Teams_API {

		/**
		 * Version of the plugin.
		 *
		 * @var string
		 */
		public $version = '1.0.0';

		/**
		 * Instance of this class.
		 *
		 * @var object
		 */
		protected static $instance = null;

		/**
		 * The Microsoft Graph API base URL.
		 *
		 * @var string
		 */
		public $api_base_url = 'https://graph.microsoft.com/v1.0/';

		/**
		 * Microsoft Teams API access token.
		 *
		 * @var string
		 */
		private $access_token;

		/**
		 * Initialize the plugin public actions.
		 */
		private function __construct() {
			// Load plugin text domain.
			add_action( 'init', array( $this, 'load_plugin_textdomain' ) );

			// Set the Microsoft Teams API access token.
			// NOTE: This is a simplified example and assumes you have a way to obtain and refresh the access token.
			$this->access_token = 'YOUR_MS_TEAMS_ACCESS_TOKEN'; // Replace with your actual access token

			// Register any necessary hooks or actions.
		}

		/**
		 * Return an instance of this class.
		 *
		 * @return object A single instance of this class.
		 */
		public static function get_instance() {
			// If the single instance hasn't been set, set it now.
			if ( null === self::$instance ) {
				self::$instance = new self();
			}

			return self::$instance;
		}

		/**
		 * Load the plugin text domain for translation.
		 */
		public function load_plugin_textdomain() {
			load_plugin_textdomain( 'wp-ms-teams-api', false, dirname( plugin_basename( __FILE__ ) ) . '/languages/' );
		}

		/**
		 * Magic getter for our object. Allows getting but not setting.
		 *
		 * @param string $field
		 * @return mixed
		 */
		public function __get( $field ) {
			return $this->$field;
		}

		/**
		 * Make a request to the Microsoft Graph API.
		 *
		 * @param string $endpoint The API endpoint.
		 * @param string $method The HTTP method (GET, POST, PUT, DELETE).
		 * @param array $params The request parameters.
		 * @return array The API response.
		 */
		public function make_request( $endpoint, $method = 'GET', $params = array() ) {
			$url = $this->api_base_url . $endpoint;

			$args = array(
				'method'  => $method,
				'headers' => array(
					'Authorization' => 'Bearer ' . $this->access_token,
					'Content-Type'  => 'application/json',
				),
			);

			if ( 'GET' === $method ) {
				$url = add_query_arg( $params, $url );
			} else {
				$args['body'] = json_encode( $params );
			}

			$response = wp_remote_request( $url, $args );

			if ( is_wp_error( $response ) ) {
				// Handle WP_Error.
				error_log( 'Microsoft Teams API Error: ' . $response->get_error_message() );
				return $response;
			}

			$status_code = wp_remote_retrieve_response_code( $response );
			if ( $status_code < 200 || $status_code >= 300 ) {
				// Handle API errors.
				$error_message = wp_remote_retrieve_body( $response );
				error_log( 'Microsoft Teams API Error (' . $status_code . '): ' . $error_message );
				return new WP_Error( 'ms_teams_api_error', $error_message, array( 'status_code' => $status_code ) );
			}

			return json_decode( wp_remote_retrieve_body( $response ) );
		}

		/**
		 * Get a list of teams.
		 *
		 * @param array $params Optional parameters (e.g., $top, $skip).
		 * @return array The list of teams.
		 */
		public function get_teams( $params = array() ) {
			return $this->make_request( 'groups?$filter=resourceProvisioningOptions/Any(x:x eq \'Team\')', 'GET', $params );
		}

		/**
		 * Get a single team by ID.
		 *
		 * @param string $team_id The ID of the team.
		 * @return array The team data.
		 */
		public function get_team( $team_id ) {
			return $this->make_request( 'groups/' . $team_id );
		}

		/**
		 * Send a message to a channel.
		 *
		 * @param string $team_id The ID of the team.
		 * @param string $channel_id The ID of the channel.
		 * @param string $message The message to send.
		 * @return array The API response.
		 */
		public function send_channel_message( $team_id, $channel_id, $message ) {
			$endpoint = 'teams/' . $team_id . '/channels/' . $channel_id . '/messages';
			$params   = array(
				'body' => array(
					'content' => $message,
				),
			);
			return $this->make_request( $endpoint, 'POST', $params );
		}

		// Add other helper methods for specific Microsoft Teams API functionalities, e.g.,:
		// public function get_channels( $team_id ) { ... }
		// public function create_channel( $team_id, $channel_name ) { ... }
		// public function get_team_members( $team_id ) { ... }
		// ... and so on

	}

endif;

/**
 * Returns the main instance of WP_MS_Teams_API.
 *
 * @return WP_MS_Teams_API The main instance.
 */
function WP_MS_Teams_API() {
	return WP_MS_Teams_API::get_instance();
}

// Get WP_MS_Teams_API Running.
WP_MS_Teams_API();