<?php

class Outlet extends AppModel {

    var $name = 'Outlet';

    public $virtualFields = array(
        'distance' => 0.00,
    );

    var $hasMany = 'Image';

    public $validate = array(
        'postcode' => array(
            'rule-1' => array(
                'rule' => array('postal', null, 'uk'),
                'last' => true
            ),
            'rule-2' => array(
                'rule' => 'notEmpty',
                'last' => true
            )
        ),
        'name' => array(
            'rule' => 'notEmpty'
        ),
        'road' => array(
            'rule' => 'notEmpty'
        ),
        'cuisine' => array(
            'rule' => 'notEmpty'
        ),
        'town' => array(
            'rule' => 'notEmpty'
        ),
        'telephone' => array(
            'rule' => 'notEmpty'
        ),
        'privateRooms' => array(
            'rule' => 'notEmpty'
        ),
        'salah' => array(
            'rule' => 'notEmpty'
        )
    );

    public $actsAs = array('Search.Searchable');

    public $filterArgs = array(
        array('name' => 'name', 'type' => 'like'),
        array('name' => 'cuisine', 'type' => 'value'),
        array('name' => 'postcode', 'type' => 'query', 'method' => 'postcodeQuery'),
    );

    public function postcodeQuery($data){
        if (empty($data['postcode'])) {
            return array();
        }
        //TODO: we have set cakephp's validator on the postcode, however we need to implement a check here to handle any unexpected values/errors from the api...
        $latLong = $this->__getLatlong($data['postcode']);

        if(isset($latLong['latitude'])){
            //$this->virtualFields['distance'] = '( 3959 * acos( cos( radians("'.$latLong['latitude'].'") ) * cos( radians( Outlet.latitude ) ) * cos( radians( Outlet.longitude ) - radians("'.$latLong['longitude'].'") ) + sin( radians("'.$latLong['latitude'].'") ) * sin( radians( Outlet.latitude) ) ) )';

            $this->virtualFields['distance'] = '(3963.0 * ACOS(   SIN("'.$latLong['latitude'].'"*PI()/180 ) * SIN( Outlet.latitude*PI()/180 ) + COS( "'.$latLong['latitude'].'"*PI()/180 ) * COS( Outlet.latitude*PI()/180 )  *  COS( (Outlet.longitude*PI()/180) - ("'.$latLong['longitude'].'"*PI()/180) )   )  )';

        }

            return $this->virtualFields['distance'];
    }

    private function __getLatLong($postcode) {
        if($postcode == false){
            return false; // postcode not entered by user
        } else {
            $postcode = str_replace(" ", "", $postcode);

            $postcodeInstance = ClassRegistry::init('Postcode');

            // check if we have already got the lat and long for the given postcode in our DB
            $postcode_record = $postcodeInstance->find('first', array('conditions' => array('Postcode.postcode' => $postcode)));

            // get the lat and long for the given postcode using the postcode api and then save the values to our DB for future use
            if($postcode_record == false){
                $url = "******************"; // Build the URL

                // specify a proxy, only for work machine
                $aContext = array(
                    'http' => array(
                        'proxy' => 'blahblah',
                        'request_fulluri' => true,
                    )
                );
                $cxContext = stream_context_create($aContext);


                $file = file_get_contents($url, false, $cxContext);

                if ($file != false) { // Some error checking - if file_get_contents returned false then something went wrong - most likely post code error
                    $pieces = explode(",", $file);
                    $result['postcode'] = $pieces[0];
                    $result['lat'] = $pieces[1];
                    $result['lng'] = $pieces[2];

                    $new_postcode = array(
                        'Postcode' => array
                            (
                                'postcode' => str_replace(" ", "", $result['postcode']),
                                'latitude' => $result['lat'],
                                'longitude' => $result['lng']
                            )
                    );

                    $postcodeInstance->save($new_postcode);

                    $postcode_data = array();
                    $postcode_data['postcode'] = $result['postcode'];
                    $postcode_data['latitude'] = $result['lat'];
                    $postcode_data['longitude'] = $result['lng'];
                } else {
                    $result['error'] = 'Postcode not found by API';
                }

            } else {
                $postcode_data['postcode'] = $postcode_record['Postcode']['postcode'];
                $postcode_data['latitude'] = $postcode_record['Postcode']['latitude'];
                $postcode_data['longitude'] = $postcode_record['Postcode']['longitude'];
            }
            return $postcode_data;
        }
    }

    /*
    *
    * Function that retrieves latitude and longitude values using __getLatLong()
    * for a newly added outlet.
    *
    */
    function beforeSave(){
        if($this->exists()){
            // do nothing for existing records...
        }else{
            //TODO: we have set cakephp's validator on the postcode, however we need to implement a check here to handle any unexpected values/errors from the api...
            $latLong = $this->__getLatlong($this->data['Outlet']['postcode']);
            $this->data['Outlet']['latitude'] = $latLong['latitude'];
            $this->data['Outlet']['longitude'] = $latLong['longitude'];
        }
        return true;
    }

}

?>