<?php
namespace Core;

use App\Config;

abstract class Model
{
    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) {
            echo $e->getMessage();
        }
    }

    public function createTable($table, $fields = [])
    {
        $sql = "CREATE TABLE IF NOT EXISTS {$table} (".implode(',', $fields).") ENGINE=InnoDB DEFAULT CHARSET=utf8;";

        $db = static::connectDB();
        $query = $db->prepare($sql);

        if ($query->execute()) {
            return true;
        }
        return false;
    }

    public function dropTable($table)
    {
        $sql = "DROP TABLE IF EXISTS {$table}";

        $db = static::connectDB();
        $query = $db->prepare($sql);

        if ($query->execute()) {
            return true;
        }
        return false;
    }

    abstract public function showAll();

    abstract public function showSingle($id);

    abstract public function entry($args);

    abstract public function update($args, $id);

    abstract public function delete($id);
}