<?php

if (! defined("BASEPATH")) exit("No direct script access allowed");

class UHSTAT1 extends FHC_Controller
{
	const BERECHTIGUNG_UHSTAT_VERWALTEN = 'student/uhstat1daten_verwalten';
	const LOGIN_SESSION_INDEX = 'bewerbung/user';
	const PERSON_ID_SESSION_INDEX = 'bewerbung/personId';
	const CODEX_OESTERREICH = 'A';
	const CODEX_UNKNOWN_YEAR = 9999;
	const CODEX_UNKNOWN_NATION = 'XXX';
	const CODEX_UNKNOWN_BILDUNGMAX = 999;
	const CODEX_EXCLUDED_NATIONS = ['ZZZ'];
	const LOWER_BOUNDARY_YEARS = 160;
	const UPPER_BOUNDARY_YEARS = 20;

	private $_uid;
	private $_uhstat1Fields = array();

	public function __construct()
	{
		parent::__construct();

		// load ci libs
		$this->load->library('form_validation');

		// load ci helpers
		$this->load->helper(array('form', 'url'));

		// load libraries
		$this->load->library('AuthLib');
		$this->load->library('PermissionLib');

		// load models
		$this->load->model('person/Benutzer_model', 'BenutzerModel');
		$this->load->model('system/Sprache_model', 'SpracheModel');
		$this->load->model('codex/Abschluss_model', 'AbschlussModel');
		$this->load->model('codex/Uhstat1daten_model', 'Uhstat1datenModel');

		$this->loadPhrases(
			array(
				'ui',
				'uhstat'
			)
		);

		$this->_uid = getAuthUID();

		// set form field information
		$this->_uhstat1Fields = array(
			'mutter_geburtsstaat' => array('name' => 'Geburtsstaat Mutter'),
			'mutter_geburtsjahr' => array('name' => 'Geburtsjahr Mutter'),
			'mutter_bildungsstaat' => array('name' => 'Bildungsstaat Mutter'),
			'mutter_bildungmax' => array(
				'name' => 'Geburtsjahr Mutter',
				'rules' => array(
					'callback_bildungsstaat_bildungmax_check[m]' => array(
						'bildungsstaat_bildungmax_check' => $this->p->t('uhstat', 'ausbildungBildungsstaatUebereinstimmung')
					)
				)
			),
			'vater_geburtsstaat' => array('name' => 'Geburtsstaat Vater'),
			'vater_geburtsjahr' => array('name' => 'Geburtsjahr Vater'),
			'vater_bildungsstaat' => array('name' => 'Bildungsstaat Vater'),
			'vater_bildungmax' => array('name' => 'Geburtsjahr Vater'),
			'vater_bildungmax' => array(
				'name' => 'Geburtsjahr Vater',
				'rules' => array(
					'callback_bildungsstaat_bildungmax_check[v]' => array(
						'bildungsstaat_bildungmax_check' => $this->p->t('uhstat', 'ausbildungBildungsstaatUebereinstimmung')
					)
				)
			)
		);
	}

	// -----------------------------------------------------------------------------------------------------------------
	// Public methods

	public function index()
	{
		$formMetaData = $this->_getFormMetaData();

		if (isError($formMetaData)) show_error(getError($formMetaData));

		if (!hasData($formMetaData)) show_error("No form meta data could be loaded");

		$uhstatData = $this->_getUHSTAT1Data();

		if (isError($uhstatData)) show_error(getError($uhstatData));

		$this->load->view("codex/uhstat1.php", array(
				'formMetaData' => getData($formMetaData),
				'uhstatData' => getData($uhstatData)
			)
		);
	}

	/**
	 * Add or update UHSTAT1 data
	 */
	public function saveUHSTAT1Data()
	{
		$saved = false;

		$person_id = $this->_getUHSTATPersonId('sui');

		$this->form_validation->set_error_delimiters('<span class="text-danger">', '</span>');

		foreach ($this->_uhstat1Fields as $field => $params)
		{
			// all fields are required
			$ruleNames = 'required';
			$ruleMessages = array('required' => $this->p->t('uhstat', 'angabeFehlt'));

			// add additional rules
			if (isset($params['rules']))
			{
				foreach ($params['rules'] as $ruleName => $ruleMessage)
				{
					$ruleNames .= '|'.$ruleName;
					$ruleMessages = array_merge($ruleMessages, $ruleMessage);
				}
			}

			$this->form_validation->set_rules(
				$field,
				$params['name'],
				$ruleNames,
				$ruleMessages
			);
		}

		$uhstat1datenRes = null;
		if ($this->form_validation->run()) // if valid
		{
			// get post fields
			$uhstatData = array();
			foreach ($this->_uhstat1Fields as $field => $params)
			{
				$uhstatData[$field] = $this->input->post($field);
			}

			// check if entry already exists
			$uhstat1datenloadRes = $this->Uhstat1datenModel->loadWhere(array('person_id' => $person_id));

			// if yes, update
			if (hasData($uhstat1datenloadRes))
			{
				$uhstatData['updateamum'] = 'NOW()';
				$uhstatData['updatevon'] = $this->_uid;
				$uhstat1datenRes = $this->Uhstat1datenModel->update(
					array('person_id' => $person_id),
					$uhstatData
				);
			}
			else // otherwise insert
			{
				$uhstatData['insertamum'] = 'NOW()';
				$uhstatData['insertvon'] = $this->_uid;
				$uhstat1datenRes = $this->Uhstat1datenModel->insert(
					array_merge($uhstatData, array('person_id' => $person_id))
				);
			}
		}

		$formMetaData = $this->_getFormMetaData();

		if (isError($formMetaData)) show_error(getError($formMetaData));

		if (!hasData($formMetaData)) show_error("No form meta data could be loaded");

		$successMessage = '';
		$errorMessage = '';
		// pass success/error messages to view
		if (isset($uhstat1datenRes))
		{
			if (isSuccess($uhstat1datenRes))
			{
				$successMessage = $this->p->t('uhstat', 'erfolgreichGespeichert');
				$saved = true;
			}
			else
				$errorMessage = $this->p->t('uhstat', 'fehlerBeimSpeichern');
		}

		// load view with form data
		$this->load->view("codex/uhstat1.php", array(
				'formMetaData' => getData($formMetaData),
				'saved' => $saved,
				'successMessage' => $successMessage,
				'errorMessage' => $errorMessage
			)
		);
	}

	/**
	 * Check callback for Bildungsstaat - if Bildungsstaat is Austria, a highest education should be in Austria.
	 * @param $bildungmax
	 * @param $bildungsstaat_typ - mother (m) or father (v)
	 * @return bool true if valid, false otherwise
	 */
	public function bildungsstaat_bildungmax_check($bildungmax, $bildungsstaat_typ)
	{
		// valid if no type passed
		if (!isset($bildungsstaat_typ) || !isset($bildungmax)) return true;

		// get correct input
		if ($bildungsstaat_typ == 'm') // mutter
			$bildungsstaat = $this->input->post('mutter_bildungsstaat');
		elseif ($bildungsstaat_typ == 'v') // vater
			$bildungsstaat = $this->input->post('vater_bildungsstaat');
		else
			return true;

		// if no Bildungsstaat or Bildungmax unknown - valid
		if (!isset($bildungsstaat) || $bildungmax == self::CODEX_UNKNOWN_BILDUNGMAX) return true;


		// find out if abschluss is in Austria
		$this->AbschlussModel->addSelect("in_oesterreich");
		$abschlussRes = $this->AbschlussModel->load($bildungmax);

		if (hasData($abschlussRes))
		{
			$in_oesterreich = getData($abschlussRes)[0]->in_oesterreich;

			// valid if Bildungsstaat and Abschluss in Austria, or Bildungsstaat and Abschluss not in Austria
			// (or Abschluss not in Austria and Bildungsstaat unknown)
			return ($in_oesterreich && $bildungsstaat == self::CODEX_OESTERREICH)
				|| (!$in_oesterreich && ($bildungsstaat != self::CODEX_OESTERREICH || $bildungsstaat == self::CODEX_UNKNOWN_NATION));
		}

		return false;
	}

	/**
	 * Deletes UHSTAT1 entry.
	 */
	public function deleteUHSTAT1Data()
	{
		$saved = false;

		// uhstat data can only be deleted with permission
		if (!$this->_checkPermission('suid')) show_error('no permission');

		$person_id = $this->_getUHSTATPersonId('suid');

		$uhstat1datenRes = $this->Uhstat1datenModel->delete(
			array('person_id' => $person_id)
		);

		$formMetaData = $this->_getFormMetaData();

		if (isError($formMetaData)) show_error(getError($formMetaData));

		if (!hasData($formMetaData)) show_error("No form meta data could be loaded");

		$successMessage = '';
		$errorMessage = '';
		// pass success/error messages to view
		if (isset($uhstat1datenRes))
		{
			if (isSuccess($uhstat1datenRes))
			{
				$successMessage = $this->p->t('uhstat', 'erfolgreichGeloescht');
			}
			else
				$errorMessage = $this->p->t('uhstat', 'fehlerBeimLoeschen');
		}

		// load view with form data
		$this->load->view("codex/uhstat1.php", array(
				'formMetaData' => getData($formMetaData),
				'successMessage' => $successMessage,
				'errorMessage' => $errorMessage
			)
		);
	}

	// -----------------------------------------------------------------------------------------------------------------
	// Private methods

	/**
	 * Gets initial data needed to display UHSTAT1 form.
	 */
	private function _getFormMetaData()
	{
		$person_id = $this->_getUHSTATPersonId('s');

		// read only display param
		$readOnly = $this->input->get('readOnly');

		// checking permissions for form

		// saving is possible if there permission or student log in (but not from application tool)
		$savePermission = $this->_checkPermission('sui') || ($this->_getUserPersonId() && !$this->_getApplicationToolPersonId());

		// deleting only possible with permission
		$deletePermission = $this->_checkPermission('suid');

		$languageIdx = $this->_getLanguageIndex();

		$formMetaData = array(
			'nation' => array(),
			'abschluss_oesterreich' => array(),
			'abschluss_nicht_oesterreich' => array(),
			'jahre' => array(),
			'person_id' => $person_id,
			'savePermission' => $savePermission,
			'deletePermission' => $deletePermission,
			'readOnly' => $readOnly
		);

		// get person data
		$this->load->model('person/Person_model', 'PersonModel');
		$this->PersonModel->addSelect("vorname, nachname");
		$personRes = $this->PersonModel->load($person_id);

		if (isError($personRes)) return $personRes;

		if (hasData($personRes))
		{
			$person = getData($personRes)[0];
			$formMetaData['vorname'] = $person->vorname;
			$formMetaData['nachname'] = $person->nachname;
		}

		$nationTextFieldName = $languageIdx == 1 ? 'langtext' : 'engltext';

		// get nation list
		$this->load->model('codex/Nation_model', 'NationModel');

		$this->NationModel->addSelect("nation_code, $nationTextFieldName AS nation_text");
		$this->NationModel->addOrder("nation_text");
		$nationRes = $this->NationModel->loadWhere('sperre IS NULL OR sperre = FALSE');

		if (isError($nationRes)) return $nationRes;

		if (hasData($nationRes))
		{
			$dropdownNations = [];
			$nations = getData($nationRes);

			foreach ($nations as $nation)
			{
				// put austria in beginning of selection
				if ($nation->nation_code == self::CODEX_OESTERREICH)
					array_unshift($dropdownNations, $nation);
				elseif (!in_array($nation->nation_code, self::CODEX_EXCLUDED_NATIONS)) // add nation if not excluded
					$dropdownNations[] = $nation;
			}

			$formMetaData['nation'] = $dropdownNations;
		}

		// get abschluss list
		$abschlussRes = $this->AbschlussModel->getActiveAbschluesse($languageIdx);

		if (isError($abschlussRes)) return $abschlussRes;

		$abschlussData = getData($abschlussRes);

		if (hasData($abschlussRes))
		{
			foreach (getData($abschlussRes) as $abschluss)
			{
				if ($abschluss->in_oesterreich === true)
					$formMetaData['abschluss_oesterreich'][] = $abschluss;
				elseif ($abschluss->in_oesterreich === false)
					$formMetaData['abschluss_nicht_oesterreich'][] = $abschluss;
				else
				{
					$formMetaData['abschluss_oesterreich'][] = $abschluss;
					$formMetaData['abschluss_nicht_oesterreich'][] = $abschluss;
				}
			}
		}

		// get realistic birth years, dated back from current year
		$currYear = date("Y");
		$yearRange = range($currYear - self::UPPER_BOUNDARY_YEARS, $currYear - self::LOWER_BOUNDARY_YEARS);
		$formMetaData['jahre'] = array_combine($yearRange, $yearRange);

		// add "unknown" option
		$formMetaData['jahre'][self::CODEX_UNKNOWN_YEAR] = 'unbekannt';

		return success($formMetaData);
	}

	/**
	 * Gets initial data needed to display UHSTAT1 form.
	 */
	private function _getUHSTAT1Data()
	{
		$person_id = $this->_getUHSTATPersonId('s');

		$this->Uhstat1datenModel->addSelect(
			implode(', ', array_keys($this->_uhstat1Fields))
		);
		$uhstatRes = $this->Uhstat1datenModel->loadWhere(array('person_id' => $person_id));

		if (isError($uhstatRes)) return $uhstatRes;

		return success(hasData($uhstatRes) ? getData($uhstatRes)[0] : null);
	}

	/**
	 * Gets language index of currently logged in user.
	 * @return int (the index, start at 1)
	 */
	private function _getLanguageIndex()
	{
		$idx = 1;
		$this->SpracheModel->addSelect('index');
		$langRes = $this->SpracheModel->loadWhere(array('sprache' => getUserLanguage()));

		if (hasData($langRes))
		{
			$idx = getData($langRes)[0]->index;
		}

		return $idx;
	}

	/**
	 * Gets Id of person, for which UHSTAT1 data is edited.
	 * Can be passed as parameter, id of logged in person, or be in session.
	 * @param berechtigungsArt type of permission (suid)
	 * @return int person_id
	 */
	private function _getUHSTATPersonId($berechtigungsArt)
	{
		// if coming from bewerbungstool - person id is in session (person must be logged in bewerbungstool)
		$applicationToolPersonId = $this->_getApplicationToolPersonId();
		if (isset($applicationToolPersonId) && is_numeric($applicationToolPersonId)) return $applicationToolPersonId;

		// if successfully logged in
		$loggedInPersonId = $this->_getUserPersonId();
		if (isset($loggedInPersonId) && is_numeric($loggedInPersonId))
		{
			// if person id passed directly...
			$person_id = $this->input->post('person_id');
			if (!isset($person_id)) $person_id = $this->input->get('person_id');

			if (isset($person_id))
			{
				if (!is_numeric($person_id)) show_error("invalid person id");
				// ...check if there is a permission for editing UHSTAT1 data
				if ($this->_checkPermission($berechtigungsArt)) return $person_id;
			}

			// if no id passed, use logged in person id
			return $loggedInPersonId;
		}

		show_error("No permission");
	}

	/**
	 * Gets person Id if there is a application tool login.
	 * @return person Id or null
	 */
	private function _getApplicationToolPersonId()
	{
		// if coming from aplication tool - person id is in session (person must be logged in bewerbungstool)
		if (isset($_SESSION[self::PERSON_ID_SESSION_INDEX])
			&& is_numeric($_SESSION[self::PERSON_ID_SESSION_INDEX])
			&& isset($_SESSION[self::LOGIN_SESSION_INDEX])
		)
			return $_SESSION[self::PERSON_ID_SESSION_INDEX];

		return null;
	}

	/**
	 * Gets person Id if there is a user login.
	 * @return person Id or null
	 */
	private function _getUserPersonId()
	{
		$loggedInPersonId = getAuthPersonId();
		if (isset($loggedInPersonId) && is_numeric($loggedInPersonId))
		{
			// check if the the user is a student and if the benutzer is active
			$this->BenutzerModel->addSelect('1');
			$res = $this->BenutzerModel->loadWhere(["public.tbl_benutzer.person_id" => $loggedInPersonId, "public.tbl_benutzer.aktiv" => TRUE]);
			if (hasData($res)) return $loggedInPersonId;
		}
		return null;
	}

	/**
	 * Checks if logged user has the UHSTAT management permission.
	 * @param $art - type of permission, e.g. suid for full permissions
	 * @return bool
	 */
	private function _checkPermission($art)
	{
		return $this->permissionlib->isBerechtigt(self::BERECHTIGUNG_UHSTAT_VERWALTEN, $art);
	}
}