<?php
namespace Biukop;
require_once(ABSPATH . "wp-config.php"); 
require_once(ABSPATH . "wp-includes/wp-db.php");

class AddrMap{
    private $user1; //wp-user
    private $user2; //wp-user
    private $origin;//addr
    private $destination; //addr
    private $json;//google response
    private $dist;//distance in meter
    private $error;//bool error
    public function __construct(String $user1_login, String $user2_login) {
        $this->error = false;
        $this->user1 = get_user_by('login', $user1_login);
        $this->user2 = get_user_by('login', $user2_login);
    
        //convert user to their address
        $this->origin = $this->get_user_address($user1_login);
        $this->destination = $this->get_user_address($user2_login);
        
        //get distance from db
        $this->dist = $this->get_distance_from_db();
        if ($this->dist == false){
            //get distance from google map
            $response = $this->get_google_direction($this->origin, $this->destination);
            if ($response == false){
                //mark error
                $this->error == true;
            }else{
                $this->json = $response;
                $this->dist = $this->convert_response_to_dist_in_meter($response);
            }
            //store it in db for future use
            $this->update_db();
        }

    }
    
    public function has_error(){
        return $this->error;
    }
    
    public function get_error_msg(){
        if($this->error)
            return "Cannot get distance getween $this->user1->display_name and $this->user2->display_name";
        else
            return "";
    }
    
    public function get_dist(){
        if ($this->error)
            return 0;
        return $this->dist;
    }
    
    public function get_dist_in_km(){
        if ($this->error)
            return 0;
        return $this->dist/1000;
    }
    
    public function get_route_json()
    {
        if ($this->error)
            return null;
        return $this->json;
    }
    
    private function update_db()
    {
        global $wpdb;
        $table_name=  $this->get_table_name();
        $sql = "INSERT INTO $table_name (origin,destination,response,distance) VALUES ('%s', '%s', '%s', %d) ;";
        $query = $wpdb->prepare($sql, array(
            $this->origin,
            $this->destination,
            json_encode($this->json),
            $this->dist,
        ));
        $results = $wpdb->get_results($query);
        
        if ( $results == false) {
            //failed
            $lastid = $wpdb->insert_id;
            $msg = sprintf("Insert into address distance db error: date=%s, user1_id=%s, user2_id=%s, orign=%s, dest=%s, resp=%s, dist=%d, db_error=%s",
                date('Y-m-d, H:i:s'),
                $this->user1->ID,
                $this->user2->ID,
                $this->origin,
                $this->destination,
                json_encode($this->json),
                $this->dist,
                $wpdb->last_error
            );
            $error_log = plugin_dir_path(__FILE__) . "/logs/addr.log";
            file_put_contents($error_log, $msg, FILE_APPEND);
        }
    }
    
    
    private function get_user_address($login){
        $user = get_user_by('login', $login);
        $addr = get_user_meta($user->ID, 'address', true);
        return $addr;
    }
    

    private function get_table_name()
    {
        global $wpdb;
        $table_name = $wpdb->prefix . 'acare_addr_distance';
        return $table_name;        
    }
    
    private function get_distance_from_db(){
        global $wpdb;
        $table_name = $this->get_table_name();
        $sql = "SELECT * FROM $table_name WHERE origin='%s' and destination='%s' ";
        $query = $wpdb->prepare($sql, array(
            $this->origin,
            $this->destination,
        ));        
        $row = $wpdb->get_row($query);
        if ( $row == null )
            return false;
        $this->json = json_decode($row->response);
        return (int) $row->distance; //in meters;
    }
    
    private function super_json_decode($json, &$value, $assoc = false, $depth = 512, $options = 0) {
        $pValue = false;
        $result = json_decode($json, $assoc, $depth);
        if(json_last_error() == JSON_ERROR_NONE) {
            $value = $result;
            return true;
        }
        return false;
    }
    
    private function convert_response_to_dist_in_meter($resp){
        $distance = -1;
        if (count($resp->routes) >0)
        {
            $legs = $resp->routes[0]->legs;
            foreach ($legs as $l){
                $distance += $l->distance->value;
            }
        }
        return $distance;
    }
    
    private function get_google_direction($origin, $destination) {
        $data = "";
        $arg = array(
            'origin' => $origin,
            'destination' => $destination,
            'key'=>'AIzaSyDMRjRh3wu0zTQneYboTk5VgQio3XABz_o',
        );
        
        $ch = curl_init("https://maps.googleapis.com/maps/api/directions/json?". http_build_query($arg));
        curl_setopt_array($ch, array(
            CURLOPT_CONNECTTIMEOUT => 10,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT        => 60,
        ));
        
        $response = false;
        if($this->super_json_decode(curl_exec($ch), $data)) {
            $response = $data;
        }
        
        $info = curl_getinfo($ch);
        if($info['http_code'] !== 200) {
            return false;
        }
        
        return $response;
        //var_dump($response);
    }
}