<?php


namespace Venom\Core;


use PDO;
use PDOException;
use Venom\Models\DatabaseObject;

/**
 * Singleton DatabaseHandler... make sure we only have one connection to the database..
 * @package Venom\Database
 */
class DatabaseHandler
{
    // constants
    public const DB_TYPE = 'type';
    public const DB_HOST = 'host';
    public const DB_PORT = 'port';
    public const DB_USER = 'user';
    public const DB_PASSWORD = 'pw';
    public const DB_DB = 'db';
    public const DB_EXTRA = 'extra';
    private static ?self $instance = null;
    private ?PDO $db = null;

    public static function get(): DatabaseHandler
    {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    public function init(array $data): void
    {
        //init instance with the current data... only working if the db is not init!
        if ($this->db != null) {
            return;
        }
        $dsn = '%s:host=%s;dbname=%s;port=%s';
        $connectString = sprintf($dsn, $data[self::DB_TYPE], $data[self::DB_HOST], $data[self::DB_DB], $data[self::DB_PORT] . $data[self::DB_EXTRA]);
        try {
            $this->db = new PDO($connectString, $data[self::DB_USER], $data[self::DB_PASSWORD]);
        } catch (PDOException $e) {
            trigger_error($e->getMessage());
            die($e->getCode());
        }
    }

    public function getOne(string $query, array $args): ?DatabaseObject
    {
        $data = $this->getAll($query, $args);
        if (count($data) > 0) {
            return $data[0];
        }
        return null;
    }

    public function getAll(string $query, array $args): array
    {
        $stmt = $this->db->prepare($query);
        $stmt->setFetchMode(PDO::FETCH_CLASS, DatabaseObject::class);
        $stmt->execute($args);
        return $stmt->fetchAll();
    }

    public function execute(string $query, array $args): bool
    {
        $stmt = $this->db->prepare($query);
        return $stmt->execute($args);
    }
}