<?php

namespace Biukop;

class XeroOauth2Sync
{
    private $oauth2;
    private $clientContactGroupID="48646f3d-cf5e-4fea-8c8b-5812bd540e1b";
    private $minimum_sync_interval_in_seconds=600;
    public function __construct($oauth2)
    {
        $this->oauth2 = $oauth2;
    }

    /*
     * Sync users from Xero to WordPress
     *
     * Contact group: 48646f3d-cf5e-4fea-8c8b-5812bd540e1b  "Clients -need carer"
     * Employees: All with "web-employee" or "skip_office_sync"
     *
     * Since Xero has API call rate limits 60 calls/ minute, we can only sync some of them
     *
     * Assuming sync_users were called at every 30 minutes, each time we retrieve
     * all clients, all employees and tries to update them;
     *
     *
     * Minimum API call quota cost,for each sync
     * getContacts retrieves all contacts  500+
     * getContactGroups retrieves all clients around 100
     * getEmployees need multiple request, each request get 100 employee at most.
     *
     * Each time (every sync) we use at least 4 API calls
     *
     * We then compare the lastsync user_meta value with the update time of each user
     * if lastsync is older than last update, then we do updates
     *
     */
    public function sync_users($mininterval=600, $employeeonly=false, $clientsonly=false){
        $this->usage();
        $this->minimum_sync_interval_in_seconds = $mininterval;
        $msg="Sync users with minimum interval set to $mininterval  \n";
        $this->logConsole($msg);

        try{
            $this->sync_clients();
            $this->sync_employees();
        }catch(\XeroAPI\XeroPHP\ApiException $e){
            $msg= "Xero API exceiption encountered during Sync: " . $e->getMessage() ." true " . print_r($e,true);
            $this->logConsole($msg);
        }
    }

    private function get_last_sync($userid){
        $lastsync = get_user_meta($userid, 'lastsync', true);
        return (int)($lastsync);
    }
    private function mark_user_updated($userid, $timestamp){
        update_user_meta($userid, 'lastsync', $timestamp);
    }

    private function sync_clients(){
        $allClients = $this->oauth2->getClients(); // by calling oauth2, the cache HTML is updated.
        foreach ($allClients as $c) {
            $this->update_or_create_clients($c);
        }
    }

    private function sync_employees(){
        $allEmployees = $this->oauth2->getEmployees(); // by calling oauth2, the cache HTML is updated.
        $to_update=[];
        $to_test=[];
        $api = $this->oauth2->get_payroll_au_instance();
        foreach ($allEmployees as $e) {
            switch($e->getEmployeeGroupName()){
                case "Web-Employee":
                    $this->update_or_create_employees($e);
                    break;
                case "skip_office_sync":
                    $this->update_or_create_employees($e);
                    // $e->setEmployeeGroupName("Web-Employee");
//                    $to_update[]= $e;
//                    if ( count($to_test) <= 2 ){
//                        $to_test[] = $e;
//                    }
                    break;
                default:
                    // other employee such as duplicate we just bypass them
                    ;
            }
        }
    }

    private function update_or_create_clients($contact) {
        $login = $contact->getContactId();
        if ( trim( $login) === "" ) {
            return; //invalid contact;
        }
        $user = get_user_by('login', $login);
        if ($user === false){
            $this->add_new_contact($contact);
        }else{
            $this->update_existing_contact($contact);
        }
    }

    private function update_or_create_employees($employee) {
        $login = $employee->getEmployeeID();
        if ( trim( $login) === "" ) {
            return; //invalid contact;
        }
        switch($employee->getEmployeeGroupName()){
            case "Web-Employee":
            case "skip_office_sync":
                break;
            default:
                // other employee such as duplicate we just bypass them
                return;
        }
        $user = get_user_by('login', $login);
        if ($user === false){
            $this->add_new_staff($employee);
        }else{
            $this->update_existing_staff($employee);
        }
    }

    public function getClients() {
        $contact_group_id   = $this->clientContactGroupID;
        $apiAcc = $this->oauth2->get_accounting_instance();
        $result = $apiAcc->getContactGroupWithHttpInfo($this->oauth2->getTenantId(), $contact_group_id);
        $this->logConsole(print_r($result,true));
        $this->logConsole(print_r($result[2],true));
        $cg = $result[0]->getContactGroups();
        $allClients = $cg[0]->getContacts();

        $ifModifiedSince = new \DateTime();
        $recent = new \DateInterval("P30000D"); // 30,000 days, means everything
        $ifModifiedSince->sub($recent);
        $where=null;
        $order="UpdatedDateUTC DESC";

        $allContacts = $apiAcc->getContacts($this->oauth2->getTenantId(), $ifModifiedSince, $where, $order);
        $ret = [];
        foreach ( $allContacts as $ac ) {
            //search from within the group
            $found = false;
            $id = $ac->getContactID();
            foreach ($allClients as $client) {
                $clientID = $client->getContactID();
                if ( $clientID == $id ) {
                    $found = true;
                    break;
                }
            }

            if ( $found ) {
                $ret[] = $ac;
            }

        }
        return $ret;
    }

    public function getEmployees() {
        $api = $this->oauth2->get_payroll_au_instance();
        $xeroTenantId = $this->oauth2->xeroTenantId;
        //$xeroTenantId = "e23fd416-3b66-43e9-b908-97fbefa24eb8"; // demo company;
        //$xeroTenantId = "4e2521ae-83e6-4895-aa90-b20aa0825ce1"; // Acaresydney ;

        $ifModifiedSince = null;// date("M d Y H:i:s", strtotime("-30 days"));
        $where = "Status==\"ACTIVE\"";
        $order = "UpdatedDateUTC DESC"; // "null; // "EmailAddress%20DESC";
        $page = 1;

        $employees=[];
        do {
            $result = $api->getEmployees($xeroTenantId,$ifModifiedSince,$where,$order,$page);
            $thisPage =  $result->getEmployees();
            $employees = array_merge($employees, $thisPage);
            $page++;
        }while (count($thisPage) == 100);

        return $employees;
    }

    public function get_client_post_address($client){
        $result = "";
        $addr = $this->get_client_address_by_type($client, 'POBOX');

        if ( $addr != false){
            if ($addr->getAddressLine1() != ""){
                $result .= $addr->getAddressLine1() . ";";
            }
            if ($addr->getAddressLine2() != ""){
                $result .= $addr->getAddressLine2() . ";";
            }
            if ($addr->getAddressLine3() != ""){
                $result .= $addr->getAddressLine3() . ";";
            }
            if ($addr->getAddressLine4() != ""){
                $result .= $addr->getAddressLine4() . ";";
            }
            if ($addr->getCity() != ""){
                $result .= $addr->getCity() . ";";
            }
            if ($addr->getPostalCode() != ""){
                $result .= $addr->getPostalCode() . ";";
            }
        }
        // echo "result for client is " . $result . "\n";
        return $result;
    }

    private function get_client_address_by_type($client, $t){
        $addr = false;
        foreach( $client->getAddresses() as $a){
            if( $a->getAddressType() == $t){
                $addr = $a;
                break;
            }
        }
        return $addr;
    }

    private function add_new_contact($contact){
        $login = $contact->getContactId();
        $user = get_user_by('login', $login);
        if ($user === false){
            $msg = sprintf("ADD Client name=[%s] {%s} \n",  $contact->getName(), $contact->getContactId());
            $this->logConsole($msg);

            $args = $this->xero_contact_profile($contact);
            $id = wp_insert_user($args);

            if (! $id instanceof  \WP_Error){
                $user = get_user_by('ID', $id);
                update_user_meta($user->ID, 'address', $args['address']);
                update_user_meta($user->ID, 'account', $args['account']);
                $this->mark_user_updated($login, $contact->getUpdatedDateUtcAsDate()->format('U'));
            }else{
                $msg = "==(Add Client failed)==";
                $this->logConsole($msg);
                $msg = sprintf("ADD Client name=[%s] {%s} Failed\n",  $contact->getName(), $contact->getContactId());
                error_log("ACARE add client failed: $msg");
            }
        }
    }

    private function update_existing_contact($contact){
        $login = $contact->getContactID();
        $user = get_user_by('login', $login);
        if ($user !== false)
        {//update user - must be existing user;
            if (! $this->user_requires_update($user, $contact)){
                $this->logConsole("skip update client (lastSync is up-to-date) : " . $contact->getName() . "\n");
                return;
            }
            $args = $this->xero_contact_profile($contact);
            $args['ID'] = $user->ID;
            unset($args['user_pass']); //we don't change password
            wp_update_user($args);
            update_user_meta($user->ID, 'address', $args['address']);
            update_user_meta($user->ID, 'account', $args['account']);
            $this->mark_user_updated($user->ID, $contact->getUpdatedDateUtcAsDate()->format('U'));

        }
    }

    private function xero_contact_profile($c){
        return [
            'user_login' => $username = $c->getContactId(),
            'user_pass' => md5(uniqid(rand() + time(), true)),
            'display_name' =>$c->getName(),
            'user_email' => $c->getEmailAddress(),
            'first_name' => $c->getFirstName(),
            'last_name' => $c->getLastName(),
            'nickname' => $c->getName(),
            'account' => $c->getAccountNumber(),
            'address'=> $this->get_client_post_address($c),
            'role' => 'client',
        ];
    }

    private function user_requires_update($user, $contact) {

        $lastSync = $this->get_last_sync($user->ID);
        $updated = $contact->getUpdatedDateUtcAsDate()->format('U');;

        return $lastSync < $updated;
    }

    private function add_new_staff($employee)
    {
        $login = $employee->getEmployeeID();
        $user = get_user_by('login', $login);
        if ($user === false){
            $msg = sprintf("ADD employee name=[%s %s] {%s} \n",
                $employee->getFirstName(),
                $employee->getLastName(),
                $employee->getEmployeeID());
            $this->logConsole($msg);

            $args = $this->xero_employee_profile($employee);
            $this->logConsole(print_r($args, true));
            $id = wp_insert_user($args);
            $this->logConsole(print_r($id, true));
            if (! $id instanceof  \WP_Error){
                $user = get_user_by('ID', $id);
                update_user_meta($user->ID, 'mobile', $args['mobile']);
                update_user_meta($user->ID, 'address', $args['address']);
                $this->mark_user_updated($user->ID, $employee->getUpdatedDateUtcAsDate()->format('U'));
            }else{
                $msg = "==(Add staff failed)==";
                $this->logConsole($msg);

                $msg = sprintf("ADD employee name=[%s %s] {%s} Failed\n",
                    $employee->getFirstName(),
                    $employee->getLastName(),
                    $employee->getEmployeeID());
                error_log("ACARE add employee failed: $msg");
            }
        }
    }

    private function update_existing_staff($employee)
    {
        $login = $employee->getEmployeeID();
        $user = get_user_by('login', $login);
        if ($this->user_requires_update($user, $employee)){
            $this->logConsole("skip update EMPLOYEE (lastSync is up-to-date) : " .
                $employee->getFirstName() . " " . $employee->getLastName() . "\n");
            return;
        }
        if ($user != false) {
            $args = $this->xero_employee_profile($employee);
            $args['ID'] = $user->ID;
            unset($args['user_pass']);
            wp_update_user($args);
            update_user_meta($user->ID, 'mobile', $args['mobile']);
            update_user_meta($user->ID, 'address', $args['address']);
            $this->mark_user_updated($user->ID, $employee->getUpdatedDateUtcAsDate()->format('U'));
        }
    }

    private function xero_employee_profile($e){
        $args = [
            'user_login' => $e->getEmployeeId(),
            'user_pass' => md5(uniqid(rand() + time(), true)),
            'display_name' =>$e->getFirstName() . " " . $e->getLastName(),
            'user_email' => $e->getEmail(),
            'first_name' => $e->getFirstName(),
            'last_name' => $e->getLastName(),
            'nickname' => $e->getFirstName(),
            'mobile' => $e->getMobile(),
            'address'=> $this->get_employee_home_address($e),
            'role' => 'staff',
        ];
        return $args;
    }

    public function get_employee_home_address($e){
//         "HomeAddress": {
//         "AddressLine1": "16 Quist Avenue",
//         "City": "Lurnea",
//         "Region": "NSW",
//         "PostalCode": "2170",
//         "Country": "AUSTRALIA"
//         },
        $addr = "";
        $home = $e->getHomeAddress();
        if ( $home == null ) {
            return "";
        }
        $addr .= $home->getAddressLine1() .",";
        $addr .= $home->getAddressLine2() .",";
        $addr .= $home->getCity() . ",";
        $addr .= $home->getRegion() . " ";
        $addr .= $home->getCountry() ." ";
        $addr .= $home->getPostalCode();
        return $addr;
    }

    private function usage(){
        $msg = "_____________________________________________\n";
        $msg .= "run this command at public_html/, where wp-config.php exist \n";
        $msg .= "wp sync_users  \n";
        $msg .= "but it may hit XERO rate limit, 60call/sec, 5000/day \n";
        $msg .= "---------------------------------------------\n";
        $this->logConsole($msg);
    }

    private function logConsole($str){
        //if is commandline
        if ( defined( 'WP_CLI' ) && WP_CLI ) {
            echo $str;
        }
    }
}