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Filename : Calendar.php
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<?php

namespace App\Libs;

class Calendar
{

    /**
     * Constructor
     */
    public function __construct()
    {
        $url = $_SERVER['REQUEST_URI'];
        $first_url = explode('?', $url);
        if (isset($first_url[1])) {
            $arr = $_GET;
            $str = '';
            foreach ($arr as $key => $value) {
                if ($key == 'month' OR $key == 'year') {
                    unset($arr['month']);
                    unset($arr['year']);
                }else{
                    $str .= '&' . $key . '=' . $value;
                }

            }
            //dd($str);
            $this->lastUrl = $str;
        }
        $this->naviHref = htmlentities($first_url[0]);
    }

    /********************* PROPERTY ********************/
    private $dayLabels = array("Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun");
    private $currentYear = 0;
    private $currentMonth = 0;
    private $currentDay = 0;
    private $currentW = null;
    private $currentDate = null;
    private $daysInMonth = 0;
    private $naviHref = null;
    private $lastUrl = '';
    private $work_days = array();
    private $work_hours = array();

    /********************* PUBLIC **********************/

    /**
     * print out the calendar
     */
    public function show($days = null, $hours = null, $year = null, $month = null)
    {
        $this->work_days = $days;
        $this->work_hours = $hours;
        $year == null;

        $month == null;

        if (null == $year && isset($_GET['year'])) {

            $year = $_GET['year'];

        } else if (null == $year) {

            $year = date("Y", time());

        }

        if (null == $month && isset($_GET['month'])) {

            $month = $_GET['month'];

        } else if (null == $month) {

            $month = date("m", time());

        }

        $this->currentYear = $year;

        $this->currentMonth = $month;

        $this->daysInMonth = $this->_daysInMonth($month, $year);

        $content = '<div id="calendar">' .
            '<div class="box">' .
            $this->_createNavi() .
            '</div>' .
            '<div class="box-content">' .
            '<ul class="label">' . $this->_createLabels() . '</ul>';
        $content .= '<div class="clear"></div>';
        $content .= '<ul class="dates">';

        $weeksInMonth = $this->_weeksInMonth($month, $year);
        // Create weeks in a month
        for ($i = 0; $i < $weeksInMonth; $i++) {

            //Create days in a week
            for ($j = 1; $j <= 7; $j++) {
                $content .= $this->_showDay($i * 7 + $j);
            }
        }

        $content .= '</ul>';

        $content .= '<div class="clear"></div>';

        $content .= '</div>';

        $content .= '</div>';
        return $content;
    }

    /********************* PRIVATE **********************/
    /**
     * create the li element for ul
     */
    private function _showDay($cellNumber)
    {

        if ($this->currentDay == 0) {

            $firstDayOfTheWeek = date('N', strtotime($this->currentYear . '-' . $this->currentMonth . '-01'));

            if (intval($cellNumber) == intval($firstDayOfTheWeek)) {

                $this->currentDay = 1;

            }
        }

        if (($this->currentDay != 0) && ($this->currentDay <= $this->daysInMonth)) {

            $this->currentDate = date('Y-m-d', strtotime($this->currentYear . '-' . $this->currentMonth . '-' . ($this->currentDay)));
            $this->currentW = date('D', strtotime($this->currentYear . '-' . $this->currentMonth . '-' . ($this->currentDay)));

            $cellContent = $this->currentDay;

            $this->currentDay++;

        } else {

            $this->currentDate = null;

            $cellContent = null;
        }
        $active = 'free';
        if(is_array($this->work_days)){
            foreach ($this->work_days as $one_day) {
                if ($one_day == $this->currentW) {
                    if ($cellContent != null) {
                        if($this->currentDate >= date('Y-m-d')){
                            $active = 'day_active';
                        }
                    }
                }
            }
        }
        return '<li id="li-' . $this->currentDate . '" class="' . $cellNumber . ' week_' . $this->currentW . ' ' . $active . ' ' . ($cellNumber % 7 == 1 ? ' start ' : ($cellNumber % 7 == 0 ? ' end ' : ' ')) .
            ($cellContent == null ? 'mask' : '') . '">' . $cellContent . '</li>';
    }

    /**
     * create navigation
     */
    private function _createNavi()
    {

        $nextMonth = $this->currentMonth == 12 ? 1 : intval($this->currentMonth) + 1;

        $nextYear = $this->currentMonth == 12 ? intval($this->currentYear) + 1 : $this->currentYear;

        $preMonth = $this->currentMonth == 1 ? 12 : intval($this->currentMonth) - 1;

        $preYear = $this->currentMonth == 1 ? intval($this->currentYear) - 1 : $this->currentYear;

        return
            '<div class="header">' .
            '<a class="prev" href="' . $this->naviHref . '?month=' . sprintf('%02d', $preMonth) . '&year=' . $preYear . ''.$this->lastUrl.'">Prev</a>' .
            '<span class="title">' . date('Y M', strtotime($this->currentYear . '-' . $this->currentMonth . '-1')) . '</span>' .
            '<a class="next" href="' . $this->naviHref . '?month=' . sprintf("%02d", $nextMonth) . '&year=' . $nextYear . ''.$this->lastUrl.'">Next</a>' .
            '</div>';
    }

    /**
     * create calendar week labels
     */
    private function _createLabels()
    {

        $content = '';

        foreach ($this->dayLabels as $index => $label) {

            $content .= '<li class="' . ($label == 6 ? 'end title' : 'start title') . ' title">' . $label . '</li>';

        }

        return $content;
    }


    /**
     * calculate number of weeks in a particular month
     */
    private function _weeksInMonth($month = null, $year = null)
    {

        if (null == ($year)) {
            $year = date("Y", time());
        }

        if (null == ($month)) {
            $month = date("m", time());
        }

        // find number of days in this month
        $daysInMonths = $this->_daysInMonth($month, $year);

        $numOfweeks = ($daysInMonths % 7 == 0 ? 0 : 1) + intval($daysInMonths / 7);

        $monthEndingDay = date('N', strtotime($year . '-' . $month . '-' . $daysInMonths));

        $monthStartDay = date('N', strtotime($year . '-' . $month . '-01'));

        if ($monthEndingDay < $monthStartDay) {

            $numOfweeks++;

        }

        return $numOfweeks;
    }

    /**
     * calculate number of days in a particular month
     */
    private function _daysInMonth($month = null, $year = null)
    {

        if (null == ($year))
            $year = date("Y", time());

        if (null == ($month))
            $month = date("m", time());

        return date('t', strtotime($year . '-' . $month . '-01'));
    }

}