<?php

class Database
{

    static $instance;
    private static $host;
    private static $database;
    private static $user;
    private static $password;

    public function __construct($host, $database, $user, $password)
    {
        self::$host = $host;
        self::$database = $database;
        self::$user = $user;
        self::$password = $password;
    }

    public static function Instance()
    {
        if (!self::$instance) {
            try {
                self::$instance = new \PDO('mysql:host=' . self::$host . ';dbname=' . self::$database . ';charset=UTF8', self::$user, self::$password, array(\PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION));
            } catch (\Exception $e) {
                die($e->getMessage());
            }
        }
        return self::$instance;
    }

    public function request($statement, $params = false)
    {
        try {
            $db = self::Instance();
            $query = $db->prepare($statement);
            if ($params) {
                $query->execute($params);
            } else {
                $query->execute();
            }
        } catch (\PDOException $e) {
            die($e->getMessage());
        }
        $query->setFetchMode(\PDO::FETCH_ASSOC);
        $result = $query->fetch();
        $query->closeCursor();
        return ($result);
    }

    public function requestAll($statement, $params = false)
    {
        try {
            $db = self::Instance();
            $query = $db->prepare($statement);
            if ($params) {
                $query->execute($params);
            } else {
                $query->execute();
            }
        } catch (\PDOException $e) {
            die($e->getMessage());
        }
        $query->setFetchMode(\PDO::FETCH_ASSOC);
        $result = $query->fetchAll();
        $query->closeCursor();
        return ($result);
    }

    public function requestPush($statement, $params = false)
    {
        try {
            $db = self::Instance();
            $query = $db->prepare($statement);
            if ($params)
                $query->execute($params);
            else
                $query->execute();
            return true;
        } catch (\PDOException $e) {
            die($e->getMessage());
        }
    }

    public function requestPushInsert($statement, $params)
    {
        try {
            $db = self::Instance();
            $query = $db->prepare($statement);
            $query->execute($params);
            return $db->lastInsertId();
        } catch (\PDOException $e) {
	   file_put_contents("errors_sql.txt", implode(',', $params) . PHP_EOL, FILE_APPEND);
        }
    }
}