<?php

namespace Boxzilla\Licensing;

use Boxzilla\Plugin;
use Exception;
use WP_Error;

class API {


	/**
	* @var License
	*/
	protected $license;

	/**
	* The API url
	*
	* @var string
	*/
	public $url = '';

	/**
	* @var int
	*/
	protected $error_code = 0;

	/**
	* @var string
	*/
	protected $error_message = '';

	/**
	* @var
	*/
	protected $last_response;

	/**
	* @param string    $url
	* @param License    $license
	*/
	public function __construct( $url, License $license ) {
		$this->url     = $url;
		$this->license = $license;
	}

	/**
	* Gets license status
	*
	* @return object
	*/
	public function get_license() {
		$endpoint = '/license';
		$response = $this->request( 'GET', $endpoint );
		return $response;
	}


	/**
	* Logs the current site in to the remote API
	*
	* @return object
	*/
	public function activate_license() {
		$endpoint = '/license/activations';
		$args     = array(
			'site_url' => get_option( 'siteurl' ),
		);
		$response = $this->request( 'POST', $endpoint, $args );
		return $response;
	}

	/**
	* Logs the current site out of the remote API
	*
	* @return object
	*/
	public function deactivate_license() {
		$endpoint = sprintf( '/license/activations/%s', $this->license->activation_key );
		$response = $this->request( 'DELETE', $endpoint );
		return $response;
	}

	/**
	* @param Plugin $plugin
	* @return object
	*/
	public function get_plugin( Plugin $plugin ) {
		$endpoint = sprintf( '/plugins/%s?format=wp', $plugin->id() );
		$response = $this->request( 'GET', $endpoint );
		return $response;
	}

	/**
	* @param Plugin[] $plugins  (optional)
	* @return object
	*/
	public function get_plugins( $plugins = null ) {
		$args = array(
			'format' => 'wp',
		);

		$endpoint = add_query_arg( $args, '/plugins' );
		$response = $this->request( 'GET', $endpoint );
		return $response;
	}

	/**
	* @param string $method
	* @param string $endpoint
	* @param array $data
	*
	* @return object|array
	*/
	public function request( $method, $endpoint, $data = array() ) {
		$url  = $this->url . $endpoint;
		$args = array(
			'method'  => $method,
			'headers' => array(
				'Content-Type' => 'application/json',
				'Accepts'      => 'application/json',
			),
		);

		// add license key to headers if set
		if ( ! empty( $this->license->key ) ) {
			$args['headers']['Authorization'] = 'Bearer ' . urlencode( $this->license->key );
		}

		if ( ! empty( $data ) ) {
			if ( in_array( $method, array( 'GET', 'DELETE' ), true ) ) {
				$url = add_query_arg( $data, $url );
			} else {
				$args['body'] = json_encode( $data );
			}
		}

		$response = wp_remote_request( $url, $args );
		return $this->parse_response( $response );
	}

	/**
	* @param mixed $response
	*
	* @return object|null
	*
	* @throws API_Exception
	*/
	public function parse_response( $response ) {
		// test for wp errors (request failures)
		if ( $response instanceof WP_Error ) {
			throw new API_Exception( $response->get_error_message() );
		}

		// retrieve response body
		$body = wp_remote_retrieve_body( $response );
		if ( empty( $body ) ) {
			return null;
		}

		$json = json_decode( $body, false );
		if ( is_null( $json ) ) {
			throw new API_Exception( __( 'The Boxzilla server returned an invalid response.', 'boxzilla' ) );
		}

		// did request return an error response?
		if ( wp_remote_retrieve_response_code( $response ) >= 400 ) {
			throw new API_Exception( $json->message, $json->code );
		}

		// return actual response data
		return $json;
	}
}