<?php
class Konto_model extends DB_Model
{

	/**
	 * Constructor
	 */
	public function __construct()
	{
		parent::__construct();
		$this->dbTable = 'public.tbl_konto';
		$this->pk = 'buchungsnr';
	}

	/**
	 * Sets a Payment as paid
	 */
	public function setPaid($buchungsnr)
	{
		// get payment
		$buchungResult = $this->loadWhere(array('buchungsnr' => $buchungsnr));

		if (isSuccess($buchungResult) && hasData($buchungResult))
		{
			$buchung = getData($buchungResult)[0];

			// get already paid amount
			$this->addSelect('sum(betrag) as bezahlt');
			$this->addGroupBy('buchungsnr_verweis');
			$buchungVerweisResult = $this->loadWhere(array('buchungsnr_verweis' => $buchungsnr));

			if (isSuccess($buchungVerweisResult))
			{
				$betragBezahlt = 0;

				if (hasData($buchungVerweisResult))
				{
					$betragBezahlt = getData($buchungVerweisResult)[0]->bezahlt;
				}

				// calculate open amount
				$betragOffen = $betragBezahlt - $buchung->betrag * (-1);

				if ($betragOffen != 0)
				{
					$data = array(
						'person_id' => $buchung->person_id,
						'studiengang_kz' => $buchung->studiengang_kz,
						'studiensemester_kurzbz' => $buchung->studiensemester_kurzbz,
						'buchungsnr_verweis' => $buchungsnr,
						'betrag' => str_replace(',', '.', $betragOffen * (-1)),
						'buchungsdatum' => date('Y-m-d'),
						'buchungstext' => $buchung->buchungstext,
						'insertamum' => date('Y-m-d H:i:s'),
						'insertvon' => '',
						'buchungstyp_kurzbz' => $buchung->buchungstyp_kurzbz,
					);

					return $this->insert($data);
				}
				else
				{
					return success();
				}
			}
			else
			{
				return error('Failed to load Payment');
			}
		}
		else
		{
			return error('Failed to load Payment');
		}
	}
}