<?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     = [
            '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 = [
            '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 = [])
    {
        $url  = $this->url . $endpoint;
        $args = [
            'method'  => $method,
            'headers' => [
                'Content-Type' => 'application/json',
                'Accepts'      => 'application/json',
            ],
            'timeout' => 10,
        ];

        // 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, [ '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(esc_html__('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;
    }
}