<?php

/**
 * Plugin Name: Xero
 * Plugin URI: https://procomhost.com
 * Description: Xero Integration for Hair on the move created by Patrick
 * Version: 1.0
 * Author: Lena, Patrick
 * Author URI: http://github.com/
 */

namespace Biukop;
require_once(dirname(__FILE__) .  '/vendor/autoload.php');
require_once (ABSPATH . 'wp-includes/pluggable.php');
require_once('storage.php');

use Carbon_Fields\Container;
use Carbon_Fields\Field;

class Xero {

    public $provider;
    public $options = [
        'scope' => ['openid email profile offline_access assets projects accounting.settings accounting.transactions accounting.contacts accounting.journals.read accounting.reports.read accounting.attachments']
    ];
    public $storage;
    public $config;
    public $apiInstance;
    public $xeroTenantId;

    public function __construct() {
        add_action( 'after_setup_theme', array($this,'boot_carbon' ));
        add_action( 'carbon_fields_register_fields', array($this, 'build_settings_page' ));
        add_action( 'carbon_fields_container_activated', array($this, 'field_activated'));
        add_action( 'parse_request', array($this, 'xero_callback'));

        add_shortcode( 'xero_org_name', array($this, 'xero_org_name'));
        add_shortcode( 'xero_org_contacts', array($this, 'xero_org_contacts'));
        add_shortcode( 'xero_org_invoices', array($this, 'xero_org_invoices'));

        add_action('init', array($this, "xero_init"));
        add_action('plugins_loaded', array($this, load_storage));
        // $this->xero_init();
        $this->storage = new StorageClass();
    }

    public function xero_init() {
        $this->provider = new \League\OAuth2\Client\Provider\GenericProvider([
            'clientId'                => '85B4A7B8AF35442CBB9943799B402FE1',
            'clientSecret'            => 'bNSYPDdBTGNMVF7kB56iOLhEmqQTlsitwH6cc4kQy83XW3iO',
            'redirectUri'             => 'https://procomhost.com/?xero_callback',
            'urlAuthorize'            => 'https://login.xero.com/identity/connect/authorize',
            'urlAccessToken'          => 'https://identity.xero.com/connect/token',
            'urlResourceOwnerDetails' => 'https://api.xero.com/api.xro/2.0/Organisation'
          ]);      
    }

    public function load_storage() {
        //$this->storage->read_value();
    }

    public function boot_carbon() {
        \Carbon_Fields\Carbon_Fields::boot();
    }


    function build_settings_page() {
        Container::make( 'theme_options', __( 'Xero Integration' ) )
        ->set_page_parent( 'options-general.php' )
        ->add_fields( array(
            Field::make( 'text', 'xero_oauth2state', 'Xero Oauth2 State' )
                ->set_attribute( 'maxLength', 2048)
                ->set_attribute( 'readOnly', true)
                ->set_default_value($this->storage->getOauth2State()),            
            Field::make( 'text', 'xero_token', 'Xero Token' )
                ->set_attribute( 'maxLength', 2048)
                ->set_attribute( 'readOnly', true)
                ->set_default_value($this->storage->getSession()['token']),
            Field::make( 'text', 'xero_refresh_token', 'RefreshToken' )
                ->set_attribute( 'readOnly', true)
                ->set_default_value( $this->storage->getSession()['refresh_token'] ),
            Field::make( 'text', 'xero_id_token', 'ID Token' )
                ->set_attribute( 'readOnly', true)
                ->set_default_value( $this->storage->getSession()['id_token'] ),
            Field::make( 'text', 'xero_tenant_id', 'Tenant ID' )
                ->set_attribute( 'readOnly', true)
                ->set_default_value( $this->storage->getSession()['tenant_id'] ),
            Field::make( 'text', 'xero_expires', 'Expires' )
                ->set_attribute( 'readOnly', true)
                ->set_default_value( $this->storage->getSession()['expires'] ),
            Field::make( 'text', 'xero_expires_human', 'Expires' )
                ->set_attribute( 'readOnly', true)
                ->set_default_value( $this->storage->getSession()['expires_human']  ),

            Field::make( 'html', 'crb_information_text' )
                ->set_html( '<h1>Connect/Reconnect</h2><p>if the above field is empty, 
                    or the expire date looks suspicous, please reconnect to Xero </p> 
                    <form action="/">
                    <input type="hidden" name="xero_reauth" value="1" />
                    <input type="submit" class="button button-primary button-large" value="Xero Connect" />
                </form>' )                
        ) );

        $this->storage->read_value();
    }


    function  field_activated() {
        $this->storage->read_value();
        $xeroTenantId = (string)$this->storage->getSession()['tenant_id'];
        if ( $xeroTenantId == "" ){
            $this->startAuthorization();
        }else{
            $this->refresh_token();
        }
    }

    public function startAuthorization() {
        // This returns the authorizeUrl with necessary parameters applied (e.g. state).
        $authorizationUrl = $this->provider->getAuthorizationUrl($this->options);

        // Save the state generated for you and store it to the session.
        // For security, on callback we compare the saved state with the one returned to ensure they match.
        $this->storage->setOauth2State($this->provider->getState());

        // Redirect the user to the authorization URL.
        header('Location: ' . $authorizationUrl);
        exit();
    }


    function xero_callback() {
        if( isset($_GET['xero_reauth']) ) {
            $this->startAuthorization();
            return;
        }
        if( ! isset($_GET['xero_callback']) ) {
            return ;
        }
        // If we don't have an authorization code then get one
        if (!isset($_GET['code'])) {
            echo "Something went wrong, no authorization code found";
            exit("Something went wrong, no authorization code found");

        // Check given state against previously stored one to mitigate CSRF attack
        } elseif (empty($_GET['state']) || ($_GET['state'] !== $this->storage->getOauth2State() )) {
            echo "Invalid State";
            $this->storage->setOauth2State("");
            exit('Invalid state');
        } else {

            try {
            // Try to get an access token using the authorization code grant.
            $accessToken = $this->provider->getAccessToken('authorization_code', [
                'code' => $_GET['code']
            ]);

            $config = \XeroAPI\XeroPHP\Configuration::getDefaultConfiguration()->setAccessToken( (string)$accessToken->getToken() );
            $identityInstance = new \XeroAPI\XeroPHP\Api\IdentityApi(
                new \GuzzleHttp\Client(),
                $config
            );

            $result = $identityInstance->getConnections();

            // Save my tokens, expiration tenant_id
            $this->storage->setToken(
                $accessToken->getToken(),
                $accessToken->getExpires(),
                $result[0]->getTenantId(),
                $accessToken->getRefreshToken(),
                $accessToken->getValues()["id_token"]
            );

            // related to $this->build_settings_page
            $url = "/wp-admin/options-general.php?page=crb_carbon_fields_container_xero_integration.php";
            header('Location: ' . $url);
            exit();

            } catch (\League\OAuth2\Client\Provider\Exception\IdentityProviderException $e) {
                echo "Xero Callback failed";
                exit();
            }
        }
    }

    function refresh_token() {
        $this->storage->read_value();
        $this->xeroTenantId = (string)$this->storage->getSession()['tenant_id'];

        if ($this->storage->getHasExpired()) {
          $provider = new \League\OAuth2\Client\Provider\GenericProvider([
              'clientId'                => '85B4A7B8AF35442CBB9943799B402FE1',
              'clientSecret'            => 'bNSYPDdBTGNMVF7kB56iOLhEmqQTlsitwH6cc4kQy83XW3iO',
              'redirectUri'             => 'https://procomhost.com/test/xero-php-oauth2-starter/callback.php',
            'urlAuthorize'            => 'https://login.xero.com/identity/connect/authorize',
            'urlAccessToken'          => 'https://identity.xero.com/connect/token',
            'urlResourceOwnerDetails' => 'https://api.xero.com/api.xro/2.0/Organisation'
          ]);
      
          try {
            $newAccessToken = $provider->getAccessToken('refresh_token', [
                'refresh_token' => $this->storage->getRefreshToken()
            ]);

          }catch (\Exception $e) {
             $this->startAuthorization();
            return;
          }
      
          // Save my token, expiration and refresh token
          $this->storage->setToken(
              $newAccessToken->getToken(),
              $newAccessToken->getExpires(),
              $this->xeroTenantId,
              $newAccessToken->getRefreshToken(),
              $newAccessToken->getValues()["id_token"] );
        }
      
        if ( $this->apiInstance == null ){
            $this->config = \XeroAPI\XeroPHP\Configuration::getDefaultConfiguration()->setAccessToken( (string)$this->storage->getSession()['token'] );
            $this->apiInstance = new \XeroAPI\XeroPHP\Api\AccountingApi(
                new \GuzzleHttp\Client(),
                $this->config
            );        
        }
    }

    public function xero_org_name() {
        ini_set('display_errors', 'On');
        $this->refresh_token();

        $apiResponse = $this->apiInstance->getOrganisations($this->xeroTenantId);
        $message = 'Organisation Name: <b> ' . $apiResponse->getOrganisations()[0]->getName() . "</b> ";
        return $message;
    }

    public function xero_org_contacts() {
        ini_set('display_errors', 'On');
        $this->refresh_token();

        $apiResponse = $this->apiInstance->getContacts($this->xeroTenantId);
        $contacts = $apiResponse->getContacts();
        $message = "<table> ";
        $message .= "<tr> <td> #    </td> 
                     <td> unique-id </td>
                     <td> name      </td>
                     <td> Supplier  </td>
                     <td> Customer  </td>
                     <td> Group     </td>
                     <td> Status </td> </tr> ";
        $count = 1;
        foreach ( $contacts as $c) {

            $group = "";
            foreach ( $c->getContactGroups() as $g) {
                $group .= $g->getName() . " - " . $g->getStatus() . "<br>";
            }

            $message .= "<tr> <td>" . $count ++ . "</td> " .
            "<td> " . $c->getContactId() .  "</td> " . 
            "<td> " . $c->getName()  .  "</td> " . 
            "<td> " . ( $c->getIsSupplier() ? "yes" : " - " ) .  "</td> " . 
            "<td> " . ( $c->getIsCustomer() ? "yes" : " - " ) .  "</td> " . 
            "<td> " .  $group  .  "</td> " . 
            "<td> " . $c->getContactStatus() .  "</td> " . 
            "</tr>";
        }
        $message .= "</table>";
        return $message;

    }

    public function xero_org_invoices() {
        ini_set('display_errors', 'On');
        $this->refresh_token();

        $apiResponse = $this->apiInstance->getInvoices($this->xeroTenantId);
        $invoices = $apiResponse->getInvoices();        

        $message = "<table> ";
        $message .= "<tr> <td> #    </td> 
                     <td> invoice id</td>
                     <td> date </td>
                     <td> contact   </td>
                     <td> amount    </td>
                     <td> Type     </td>
                     <td> Status </td> </tr> ";
        $count = 1;        

        foreach ( $invoices as $c) {
            $strDate = "";
            $d = $c->getDate();
            if ( $d != null)  {
                $da = $c->getDateAsDate();
                $strDate = $da->format("Y-m-d");
            } else  {
                $strDate = $d;
            }
            
            $message .= "<tr> <td>" . $count ++ . "</td> " .
            "<td> " . $c->getInvoiceNumber()  .  "</td> " . 
            "<td> " . $strDate .  "</td> " . 
            "<td> " . $c->getContact()->getName() .  "</td> " . 
            "<td> " . $c->getTotal()  .  "</td> " . 
            "<td> " . $c->getType()  .  "</td> " . 
            "<td> " . $c->getStatus() .  "</td> " . 
            "</tr>";
        }
        $message .= "</table>";
        return $message;        
    }

}


$b = new Xero();