<?php
    class Maps {
        private $lat;
        private $long;
        private $postCode;

        private $domain;
        private $apiKey;

        public function __construct($apiKey, $domain = false) {
            $this->apiKey = $apiKey;
            if (!$domain) {
                $this->domain = '.co.uk';
            } else {
                $this->domain = $domain;
            }
        }

        public function getLatitude() {
            if (!$this->lat) {
                return false;
            }
            return $this->lat;
        }

        public function getLong() {
            if (!$this->long) {
                return false;
            }
            return $this->long;
        }

        public function getPostCode() {
            if (!$this->postCode) {
                return false;
            }
            return $this->postCode;
        }

        public function setPostCode($postCode) {
            $this->postCode = $this->formatPostCode($postCode);
            return $this->postCodeToCoords();
        }

        private function postCodeToCoords() {
            try {
                if (!$this->postCode) {
                    throw new Exception('No postcode set!');
                }

                $url = 'http://maps.google' . $this->domain . '/maps/geo?q=' . urlencode($this->postCode) . "&output=json&key=" . $this->apiKey;
                $json = @file_get_contents($url);
                if (!$json) {
                    throw new Exception('Unable to download data from google maps.');
                }

                $data = json_decode(str_replace('&quot;', '"', htmlentities($json)));

                if ($data->Placemark[0]->Point->coordinates[1] === false) {
                    throw new Exception('Unable to locate coordinate data (latitude) for ' . $this->postCode);
                }

                if ($data->Placemark[0]->Point->coordinates[0] === false) {
                    throw new Exception('Unable to locate coordinate data (longitude) for ' . $this->postCode);
                }

                $this->long = $data->Placemark[0]->Point->coordinates[0];
                $this->lat = $data->Placemark[0]->Point->coordinates[1];
                return true;
            } catch (Exception $e) {
                return false;
            }
        }

        private function formatPostCode($postCode) {
            $originalPostCode = $postCode;

            $matchGroups = array();
            $matchGroups[] = '[a-pr-uwyz]';
            $matchGroups[] = '[a-hk-y]';
            $matchGroups[] = '[abd-hjlnpq-uw-z]';

            $patterns = array();
            $patterns[] = '/^(' . $matchGroups[0] . $matchGroups[1] . '?\d{1,2})(\d' . $matchGroups[2] . '{2})$/i';
            $patterns[] = '/^(' . $matchGroups[0] . '\d[a-hjkstuw])(\d' . $matchGroups[2] . '{2})$/i';
            $patterns[] = '/^(' . $matchGroups[0] . $matchGroups[1] . '\d[abehmnprvwxy])(\d' . $matchgroups[2] . '{2})$/i';
            $patterns[] = '/^(gir)(0aa)$/i';
            $patterns[] = '/^(bfpo)(\d{1,4})$/i';
            $patterns[] = '/^(bfpo)(c\/o\d{1,3})$/i';

            $postCode = str_replace(' ', '', $postCode);

            foreach ($patterns as $pattern) {
                $matches = array();
                if (preg_match($pattern, $postCode, $matches)) {
                    $postCode = strtoupper($matches[1] . ' ' . $matches[2]);
                    $postCode = str_replace('C/O', 'c/o ', $postCode);
                    return $postCode;
                }
            }

            return $originalPostCode;
        }
    }
?>