<?php

/* xero integration oauth 2 */

/* required by XeroOauth2 in 2021 */

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

use \Carbon_Fields\Container;
use \Carbon_Fields\Field;
use \Carbon_Fields\Carbon_Fields;
use phpDocumentor\Reflection\DocBlock\Tags\Method;

class XeroOAuth2
{
    private $office; // parent

    private $clientID = '83CC79EEC6A54B4E8C2CA7AD61D1BF69';
    private $clientSecret = 'axgKF-Ri60D89conDFhqZsi1wu7uLdQFGvMpino9nI-nfO3f';
	
    private $minimum_sync_interval_in_seconds = 600;

    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 payroll.employees payroll.payruns payroll.payslip payroll.timesheets payroll.settings files']
    ];

    public $storage;
    public $config;
    public $apiAccountingInstance;  //accounting instance
    public $apiPayrollInstance; // payroll au instance
    public $xeroTenantId;

    private $shortcodes;
    private $sync;

    public function __construct($office)
    {
        $this->office = $office;
        $this->shortcodes = new XeroOauth2ShortCode($this);
        $this->sync = new XeroOauth2Sync($this);
        $this->storage = new StorageClass();

        add_action('init', array($this, 'init'));

        add_action( 'plugins_loaded', array( '\\Carbon_Fields\\Carbon_Fields', 'boot' ) );
        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'));

    }

    public function __call($method, $args) {
        error_log("$method is not defined" );
    }

    public function sync_users($mininterval, $employeeonly, $clientsonly) {
        $this->sync->sync_users($mininterval, $employeeonly, $clientsonly);
    }

    public function init()
    {
        $this->provider = $this->create_provider();
        if ($this->refresh_token() && is_user_logged_in()) {
            $this->instant_sync();
        }
    }

    public function getTenantId() {
        return $this->xeroTenantId;
    }
    private function create_provider() {
        $provider = new \League\OAuth2\Client\Provider\GenericProvider([
            'clientId' => $this->clientID,
            'clientSecret' =>  $this->clientSecret,
            'redirectUri' => $this->getRedirectURL(),
            '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'
        ]);
        return $provider;
    }

    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 XeroOauth2 </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"]
                );

                //we have successfully updated token, now start auto refresh
                update_option( "xero2_auth_refreshing_token_auto", false, true );
                //allow refresh token automatically on each call back

                // 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();
            }
        }
    }

    private function getRedirectURL() {
        return get_site_url() . "/?xero_callback";
    }

    function refresh_token($enforced=false) : bool
    {
        $refreshing_token = get_option("xero2_auth_refreshing_token_auto" , false);
        if ($refreshing_token &&!$enforced) {
            //prevent loop in refresh token when browser redirect pages
            return false;
        }

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

        update_option( "xero2_auth_refreshing_token_auto", true, true ); //mark a transaction
        if ($this->storage->getHasExpired() || $enforced ) {
            $this->provider = $this->create_provider();

            try {
                $newAccessToken = $this->provider->getAccessToken('refresh_token', [
                    'refresh_token' => $this->storage->getRefreshToken()
                ]);

            } catch (\Exception $e) {
                if ($enforced) {
                    $this->email_xero_oauth2_exceptions($e, "refresh_token");
                    echo "refresh xero security token failed, please ensure you have paid Xero subscription, " .
                          "and then contact site administrator ";
                    exit();
                }else if ( current_user_can( 'manage_options' )  ) {
                    //Something in the case of admin,
                    $this->startAuthorization();
                }else{ //normal user
                    $current_user = wp_get_current_user();

                    $this->email_xero_oauth2_exceptions($e,
                        "refresh_token - non admin user: id=$current_user->Id, name=$current_user->name" );
                }
                return false;
            }

            // Save my token, expiration and refresh token
            $this->storage->setToken(
                $newAccessToken->getToken(),
                $newAccessToken->getExpires(),
                $this->xeroTenantId,
                $newAccessToken->getRefreshToken(),
                $newAccessToken->getValues()["id_token"]);
        }

        update_option( "xero2_auth_refreshing_token_auto", false, true ); // we are not refreshing token
        return true;
    }

    private function email_xero_oauth2_exceptions(\Exception $e, $source) {
        $message = "Xero Auth2 exception \n" . print_r($e, true) ;
        $admin_email =  get_bloginfo( "admin_email" );
        $headers = ['Bcc: patrick@biukop.com.au'];
        $subject = " XeroOauth2 Exception from: $source";
        wp_mail($admin_email, $subject, $message, $headers);
    }

    public function get_accounting_instance() {
        $this->refresh_token();
        if ($this->apiAccountingInstance == null) {
            $this->config = \XeroAPI\XeroPHP\Configuration::getDefaultConfiguration()->setAccessToken(
		    (string)$this->storage->getSession()['token']);
	    //enable debug for XeroRate issue
	    // it cause create invoice faile as AJAX returns debug info, ruining the JSON response
            $this->apiAccountingInstance = new \XeroAPI\XeroPHP\Api\AccountingApi(
                new \GuzzleHttp\Client(['debug' => false]),
                $this->config
            );
        }
        return $this->apiAccountingInstance;
    }

    public function get_payroll_au_instance() {
        $this->refresh_token();
        if ($this->apiPayrollInstance == null) {
            $this->config = \XeroAPI\XeroPHP\Configuration::getDefaultConfiguration()->setAccessToken(
                (string)$this->storage->getSession()['token']);
            //$this->config->setDebug(true);
            //$this->config->setDebugFile("/home/acaresydneycom/public_html/wp-content/plugins/ts/debug.log");
            $this->apiPayrollInstance = new \XeroAPI\XeroPHP\Api\PayrollAuApi(
                new \GuzzleHttp\Client(),
                $this->config
            );
        }
        return $this->apiPayrollInstance;
    }


    //
    //TS implementation
    //

    /* sync xero to wp options */
    public function instant_sync(){
        try{
            $this->sync_pay_item();
            $this->sync_payroll_calendar();
        }catch(\Exception $e){
            $this->office->log("XeroAuth2\\instant_sync() has exception :" . $e->getMessage());
        }
    }

    private function sync_pay_item() {
        if ($this->too_close_to_sync_payitem()){
            return;
        }

        $api = $this->get_payroll_au_instance();
        $xeroTenantId = $this->xeroTenantId;
        $page = 1;
        try {
            $result = $api->getPayItems($xeroTenantId, null, null, null, $page);

            foreach ($result->getPayItems()->getEarningsRates() as $e){
//             "EarningsRateID": "34e17d08-237a-4ae2-8115-375d1ff8a9ed",
//             "Name": "Overtime Hours (exempt from super)",
//             "EarningsType": "OVERTIMEEARNINGS",
//             "RateType": "MULTIPLE",
//             "AccountCode": "477",
//             "Multiplier": 1.5,
//             "IsExemptFromTax": true,
//             "IsExemptFromSuper": true,
//             "AccrueLeave": false,
//             "IsReportableAsW1": true,
//             "UpdatedDateUTC": "2019-03-16T13:18:19+00:00",
//             "CurrentRecord": false
                if ($e->getCurrentRecord() == "true"){
                    $payitem_options[]= array(
                        'EarningsRateID' => $e->getEarningsRateID(),
                        'Name'=> $e->getName(),
                        'EarningsType'=> $e->getEarningstype(),
                        'RatePerUnit' => $e->getRatePerUnit(),
                        'RateType' => $e->getRateType(),
                        'AccountCode' => $e->getAccountCode(),
                        "Multiplier"=> $e->getMultiplier(),
                        "IsExemptFromTax" => $e->getIsExemptFromTax(),
                        "IsExemptFromSuper"=> $e->getIsExemptFromSuper(),
                        "AccrueLeave" => $e->getAccrueLeave(),
                        "TypeOfUnits" => $e->getTypeOfUnits(),
                        "CurrentRecord"=> $e->getCurrentRecord(),
                    );
                }
            }
            update_option('bts_payitem_earnings_rate', $payitem_options);
            update_option('bts_payitem_last_sync', time());


        } catch (Exception $e) {
            echo 'Exception when calling PayrollAuApi->getPayItems: ', $e->getMessage(), PHP_EOL;
        }
    }

    public function sync_payroll_calendar() {
        if ($this->too_close_to_sync_payroll_calendar()){
            return;
        }

        $pc = $this->get_payroll_calendar();
        $start = $pc->getStartDateAsDate()->format('Y-m-d');
        $finish = new \DateTime($start);
        $finish = $finish->modify("+13 days")->format('Y-m-d');
        $paydate = $pc->getPaymentDateAsDate()->format('Y-m-d');
        $calendar["start"] = $start;
        $calendar["finish"] = $finish;
        $calendar["paydate"] = $paydate;

        update_option('bts_pay_roll_calendar', $calendar);
        update_option('bts_pay_roll_calendar_last_sync', time());
        
    }

    private function too_close_to_sync_payitem(){
        $lastsync = get_option('bts_payitem_last_sync', 0);
        $now = time();
        $diff = $now - (int) $lastsync;
        return $diff < $this->minimum_sync_interval_in_seconds; //default 10 minutes
    }


    private function too_close_to_sync_payroll_calendar(){
        $lastsync = get_option('bts_pay_roll_calendar_last_sync', 0);
        $now = time();
        $diff = $now - (int) $lastsync;
        return $diff < 3.0 * $this->minimum_sync_interval_in_seconds; //default 1.3 * 10 minutes
    }


    public function getClients($contact_group_id = null) {
        $ret = $this->sync->getClients($contact_group_id);
        $this->shortcodes->updateClientsShortCode($ret);
        return $ret;
    }

    public function getEmployees(){
        $ret = $this->sync->getEmployees();
        $this->shortcodes->updateEmployeeShortCode($ret);
        return $ret;
    }

    public function devGetEmployees() {
        $this->sync->sync_users(600);
    }
    /*
     *
     * @param XeroAPI\Model\Accounting\Contact $client
     */
    public function getClientAddress($client) {
        return $this->sync->get_client_post_address($client);
    }

    public function getEmployeeAddress($employee) {
        return $this->sync->get_employee_home_address($employee);
    }


    /*
     * operation get_payroll_calendar
     * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
     * @throws \InvalidArgumentException
     */
    public function get_payroll_calendar()
    {
        $id =  "33dc7df5-3060-4d76-b4da-57c20685d77d"; //fortnightly
        $api = $this->get_payroll_au_instance();
        $calendars = $api->getPayrollCalendar($this->xeroTenantId, $id);
        return $calendars[0];
    }

}