<?php

namespace Ulmus;

use Ulmus\Adapter\AdapterInterface;

use Ulmus\Common\PdoObject;

class ConnectionAdapter
{
    public string $name;

    public array $configuration;

    protected AdapterInterface $adapter;

    public PdoObject $pdo;

    public function __construct(string $name = "default", array $configuration = [])
    {
        $this->name = $name;
        $this->configuration = $configuration;

        if ( $name === "default" ) {
            Ulmus::$defaultAdapter = $this;
        }
    }

    public function resolveConfiguration()
    {
        $connection = $this->configuration['connections'][$this->name] ?? [];

        if ( $adapterName = $connection['adapter'] ?? false ) {
            $this->adapter = $this->instanciateAdapter($adapterName);
        }
        else {
            throw new \InvalidArgumentException("Adapter not found within your configuration array.");
        }

        if ( false === $this->adapter->hostname = $connection['host'] ?? false ) {
            throw new \InvalidArgumentException("Your `host` name is missing from your configuration array");
        }

        if ( false === $this->adapter->port = $connection['port'] ?? false ) {
            throw new \InvalidArgumentException("Your `port` number is missing from your configuration array");
        }

        if ( false === $this->adapter->database = $connection['database'] ?? false ) {
            throw new \InvalidArgumentException("Your `database` name is missing from your configuration array");
        }

        if ( false === $this->adapter->username = $connection['username'] ?? false ) {
            throw new \InvalidArgumentException("Your `username` is missing from your configuration array");
        }

        if ( false === $this->adapter->password = $connection['password'] ?? false ) {
            throw new \InvalidArgumentException("Your `password` is missing from your configuration array");
        }
    }

    /**
     * Connect the adapter
     * @return self
     */
    public function connect()
    {
        $this->pdo = $this->adapter->connect();
        $this->pdo->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
        $this->pdo->setAttribute(\PDO::ATTR_EMULATE_PREPARES, false);
        $this->pdo->setAttribute(\PDO::ATTR_AUTOCOMMIT, false);
        $this->pdo->setAttribute(\PDO::ATTR_DEFAULT_FETCH_MODE, \PDO::FETCH_ASSOC);
        $this->pdo->setAttribute(\PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, false);

        return $this;
    }

    /**
     * Instanciate an adapter which interact with the data source
     * @param  string $name An Ulmus adapter or full class name implementing AdapterInterface
     * @return AdapterInterface
     */
    protected function instanciateAdapter($name)
    {
        $class = substr($name, 0, 2) === "\\" ? $name : "\\Ulmus\\Adapter\\$name";
        return new $class();
    }
}