php calendar

Calendar.php

<?php

/**
 * Class Calendar
 */
abstract class Calendar
{
    protected $month = 0;
    protected $year = 0;
    protected $dates = array();
    protected $firstDay = 1;
    protected $config = array(
        'activeClass'     => 'active',
        'otherMonthClass' => 'other-month',
        'holidayClass'    => 'holiday'
    );
    protected $firstCalendarDate = '';
    protected $lastCalendarDate = '';

    /**
     * @param array $cfg
     * @return $this
     */
    public function setConfig($cfg = array())
    {
        $this->config = array_merge($this->config, $cfg);

        return $this;
    }

    /**
     * @param string $month
     * @return $this
     */
    public function month($month = '')
    {
        if (empty($month)) {
            $month = date('m');
        } else {
            $month = (int)$month;
            if (!$month) {
                $month = 1;
            }
            if ($month > 12) {
                $month = 12;
            }
        }
        $this->month = $month;

        return $this;
    }

    /**
     * @param string $year
     * @return $this
     */
    public function year($year = '')
    {
        if (empty($year)) {
            $year = date('Y');
        } else {
            $year = (int)$year;

        }
        $this->year = $year;

        return $this;
    }

    /**
     * return string;
     */
    public function setDates()
    {
        $ts = mktime(0, 0, 0, $this->month, 1, $this->year);
        $startDayOfWeek = date('N', $ts);
        $startDay = ($this->firstDay == 1 ? 2 : 1) - $startDayOfWeek;
        $finishDay = $startDay + 42;
        $this->firstCalendarDate = mktime(0, 0, 0, $this->month, $startDay, $this->year);
        $this->lastCalendarDate = mktime(0, 0, 0, $this->month, $finishDay - 1, $this->year);
        while ($startDay < $finishDay) {
            $ts = mktime(0, 0, 0, $this->month, $startDay, $this->year);
            $this->dates[] = array(
                'day'   => date('N', $ts),
                'date'  => date('d', $ts),
                'month' => date('m', $ts),
                'year'  => date('Y', $ts)
            );
            $startDay++;
        }

        return $this;
    }

    /**
     * @param string $format
     * @return int|string
     */
    public function getFirstCalendarDate($format = '')
    {
        return empty($format) ? $this->firstCalendarDate : date($format, $this->firstCalendarDate);
    }

    /**
     * @param string $format
     * @return int|string
     */
    public function getLastCalendarDate($format = '')
    {
        return empty($format) ? $this->lastCalendarDate : date($format, $this->lastCalendarDate);
    }

    /**
     * @return string
     */
    public function render()
    {
        $this->setDates();
        $out = '';
        $i = 0;
        for ($w = 1; $w <= 6; $w++) {
            $week = '';
            for ($d = 1; $d <= 7; $d++) {
                $week .= $this->renderDay($this->dates[$i]);
                $i++;
            }
            $out .= $this->renderWeek($week);
        }

        return $this->renderOuter($out);
    }

    /**
     * @param string $wrap
     * @return string
     */
    abstract protected function renderOuter($wrap = '');

    /**
     * @param string $week
     * @return string
     */
    abstract protected function renderWeek($week = '');

    /**
     * @param array $data
     * @return string
     */
    abstract protected function renderDay($data = array());

    /**
     * @param array $data
     * @return array
     */
    public function getClasses(array $data)
    {
        $out = array();
        $currentDate = date('d.m.Y');
        if ($currentDate === $data['date'] . '.' . $data['month'] . '.' . $data['year']) {
            $out['activeClass'] = isset($this->config['activeClass']) ? $this->config['activeClass'] : 'active';
        }
        if ($data['month'] != $this->month) {
            $out['otherMonthClass'] = isset($this->config['otherMonthClass']) ? $this->config['otherMonthClass'] : 'other-month';
        }
        if ($data['day'] == 6 || $data['day'] == 7) {
            $out['holidayClass'] = isset($this->config['holidayClass']) ? $this->config['holidayClass'] : 'holiday';
        }
        $out['classnames'] = implode(' ', array_values($out));
        $out['classes'] = ' class="' . $out['classnames'] . '"';

        return $out;
    }
}