<?php
namespace App\Library;

use PDO;
use PDOException;

class Database extends PDO
{
    public function __construct(string $dsn, string $username, string $password)
    {
        try {
            $dsn .= ";charset=utf8";
            parent::__construct(
                $dsn, 
                $username, 
                $password, 
                [PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION]
            );
            echo "Подлючено успешно!\n";
        } catch (PDOException $e) {
            echo "Ошибка подключения:". $e->getMessage() . "\n";
        }
    }

    public function __destruct()
    {
        echo "Подключение прервано!\n";
    }
    
    public function insert(string $table, array $data) : void
    {
        $keys = array_keys($data);
        $sql = "INSERT INTO $table (";
        foreach ($keys as $key) {
            $sql .= "$key,";
        }
        $sql = substr_replace($sql, ")", -1);
        $sql .= " VALUES (";
        foreach ($keys as $key) {
            $sql .= ":$key,";
        }
        $sql = substr_replace($sql,"", -1);
        $stmt = $this->prepare($sql);

        foreach ($data as $key => $row) {
            try {
                $stmt->bindParam(":$key", $row[$key]);
                $stmt->execute();
            } catch (PDOException $e) {    
                echo "Ошибка запроса: " . $e->getMessage() . "\n";    
            }
        }
    }

    public function select(string $table) : array|null
    {
        $stmt = $this->prepare("SELECT * FROM $table");
        try {
            $stmt->execute();
            $array = $stmt->fetchAll(PDO::FETCH_ASSOC);
        } catch (PDOException $e) {
            echo "Ошибка запроса: " . $e->getMessage() . "\n";  
        } finally {
            return $array;
        }
    }

    public function selectWhere(
        string $table, 
        array $atributes, 
        array $filters
    ) : array|null {
        // Строим запрос
        $sql = "SELECT ";
        foreach ($atributes as $atribute) {
            $sql .= "$atribute,";
        }
        $sql = substr_replace($sql," ", -1);
        $sql .= "FROM $table WHERE ";
        foreach ($filters as $key => $filter) {
            $sql .= "$key = :$key ";
        }
        $stmt = $this->prepare($sql);
        foreach ($filters as $key => $filter) {
            $stmt->bindParam(":$key", $filter);
        }
        // Выполняем
        try {
            $stmt->execute();
            $array = $stmt->fetchAll(PDO::FETCH_ASSOC);
        } catch (PDOException $e) {
            echo "Ошибка запроса: " . $e->getMessage() . "\n";  
        } finally {
            return $array;
        }
    }
}