<?php

/**
 * SloveniaMovieShowtimes class
 *
 * Class for fetching movie showtimes for the cinemas in Slovenia.
 * Information is retrieved from http://www.napovednik.com.
 *
 * @copyright  2009 Tomaž Muraus
 * @license    http://www.gnu.org/copyleft/gpl.html   GPL License
 * @version    Release: 1.0
 * @link       http://www.tomaz-muraus.info
 */
class SloveniaMovieShowtimes
{
    const SHOWTIMES_URL = 'http://www.napovednik.com/kino/';
    const MOVIE_URL = 'http://www.napovednik.com';
    protected $_city;
    protected $_date;
    protected $_showtimes = array();

    public function __construct($city = 'ljubljana', $date = 'today')
    {
        $this->_city = $this->_formatCityName($city);
        $this->_date = $date;
    }

    /**
     * Fetches the showtimes for the given city and date.
     *
     * @return array Showtimes array.
     */
    public function fetchShowtimes()
    {
        if ($this->_checkForValidCity($this->_city) === FALSE)
        {
            return FALSE;
        }

        if ($this->_date === 'today')
        {
            $data = file_get_contents(self::SHOWTIMES_URL . $this->_city . '/');
        }
        else
        {
            // Calculate the date difference in days between the current and given date
            $differenceInDays = $this->_calculateDateDifferenceInDays(strtotime($this->_date), mktime(0, 0, 0, date('m'), date('d'), date('Y')));

            // Maximal date difference in days can be +/-25 days
            if (abs($differenceInDays) > 25)
            {
                return FALSE;
            }
            else
            {
                $data = file_get_contents(self::SHOWTIMES_URL . $this->_city . '/d/' . $differenceInDays);
            }
        }

        // Fetch cinema list for the specified city and date
        preg_match_all('#<h2><a href=".*?" class="kino">(.*?):*</a>:*</h2>#i', $data, $cinemas);

        // Fetch movie showtimes for each cinema
        for ($i = 0; $i < count($cinemas[0]); $i++)
        {
            $start = strpos($data, $cinemas[0][$i]) + strlen($cinemas[0][$i]);
            $end = ($i < count($cinemas[0]) - 1) ? strpos($data, $cinemas[0][$i + 1]) : strpos($data, '<div id=footer><small>');
            $length = $end - $start;

            $cinemaData = substr($data, $start, $length);
            preg_match_all('#<h4><a href="(.*)">(.*?)</a></h4>#i', $cinemaData, $title);
            preg_match_all('#</h4>\s(.*?)<br />#i', $cinemaData, $info);
            preg_match_all('#<i>(.*?)</i><br>#i', $cinemaData, $times);

            // Fill the showtimes array
            $this->_showtimes[$i] = array
                                        (
                                        	'id' => $i,
                                        	'cinema' => $cinemas[1][$i],
                                            'movies' => array()
                                        );

            for ($j = 0; $j < count($title[0]); $j++)
            {
                $this->_showtimes[$i]['movies'][$j] = array
                                                      (
                                                          'id' => $j,
                                                          'title' => $title[2][$j],
                                                          'url' => self::MOVIE_URL . $title[1][$j],
                                                          'info' => $info[1][$j],
                                                          'times' => $times[1][$j]
                                                      );
            }
        }

        return $this->_showtimes;
    }

    /**
     * Checks if the given city is valid.
     *
     * @param string $city City name.
     *
     * @return boolean TRUE on success, FALSE otherwise.
     */
    protected function _checkForValidCity($city)
    {
        $validCities = file_get_contents('http://www.napovednik.com/kino_sporedi');

        preg_match('#<div id="*subSelect"*>(.*?)</div>#is', $validCities, $matches);
        $validCities = preg_replace(array('#<h1>#', '#<a href=.*?>#', '#</h1>#', '#</a>#', '#\s\|\s#'), array('', '', '', '', '|'), $matches[1]);
        $validCities = array_map(array($this, _formatCityName), explode('|', $validCities));

        if (in_array($city, $validCities))
        {
            return TRUE;
        }
        else
        {
            return FALSE;
        }
    }

    /**
     * Calculates the difference in days between the two dates.
     *
     * @param int $date1 First date as Unix timestamp.
     * @param int $date2 Second date as Unix timestamp.
     *
     * @return int Difference in days.
     */
    protected function _calculateDateDifferenceInDays($date1, $date2)
    {
        $differenceInDays = floor((($date1 - $date2) / (60 * 60 * 24)));

        return $differenceInDays;
    }

    /**
     * Formats the city name (replaces spaces with an underscore and makes a name lowercase).
     *
     * @param string $city City name.
     *
     * @return string Formated city name.
     */
    protected function _formatCityName($city)
    {
        return strtolower(str_replace(' ', '_', $city));
    }
}

/* End of file SloveniaMovieShowtimes.php */
/* Location: ./SloveniaMovieShowtimes.php */