<?php
namespace App\Models;

use App\Config;

class ClientSession
{
    protected static $conn = null;

    protected static function connectDB()
    {
        try {
            if (!self::$conn) {
                $dsn = 'mysql:host='.Config::DB_HOST.';dbname='.Config::DB_DB;
                self::$conn = new \PDO($dsn, Config::DB_UNAME, Config::DB_PWD);

                self::$conn->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
            }
            return self::$conn;
        } catch (PDOException $e) {
            throw new \Exception($e->getMessage, 444);
        }
    }

    public static function fetch($args)
    {
        $sql = "SELECT * FROM `client_session` WHERE ";

        $x = 0;
        foreach ($args as $key => $value) {
            $sql .= "$key=?";
            if ($x < count($args)-1) {
                $sql .= " AND ";
            }
            $x++;
        }

        try {
            $db = static::connectDB();
            $query = $db->prepare($sql);
            $x = 1;
            foreach ($args as $value) {
                $query->bindValue($x, $value);
                $x++;
            }

            $query->execute();
            $result = $query->fetch(\PDO::FETCH_ASSOC);
        } catch (PDOException $e) {
            $result = $e->getMessage();
        }
        return $result;
    }

    public static function entry($args)
    {
        $sql = "INSERT INTO `client_session` (`ip_address`, `uid`) VALUES (?, ?)";

        try {
            $db = static::connectDB();
            $query = $db->prepare($sql);
            $query->bindValue(1, $args['ip_address']);
            $query->bindValue(2, $args['uid']);
            $query->execute();

            $last_entry = "SELECT LAST_INSERT_ID()";
            $last_entry = $db->prepare($last_entry);
            $last_entry->execute();

            $result = $last_entry->fetch(\PDO::FETCH_ASSOC);
            return true;
        } catch (PDOException $e) {
            $result = $e->getMessage();
        }
        return $result;
    }

    public static function remove($ip, $id)
    {
        $sql = "DELETE FROM `client_session` WHERE `ip_address` = ? AND `uid` = ?";

        try {
            $db = static::connectDB();
            $query = $db->prepare($sql);
            $query->bindValue(1, $ip);
            $query->bindValue(2, $id);
            $query->execute();

            $result = self::fetch(['uid' => $id]);
        } catch (PDOException $e) {
            $result = $e->getMessage();
        }
        return $result;
    }
}