<?php


/**


 * CodeIgniter


 *


 * An open source application development framework for PHP


 *


 * This content is released under the MIT License (MIT)


 *


 * Copyright (c) 2014 - 2019, British Columbia Institute of Technology


 *


 * Permission is hereby granted, free of charge, to any person obtaining a copy


 * of this software and associated documentation files (the "Software"), to deal


 * in the Software without restriction, including without limitation the rights


 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell


 * copies of the Software, and to permit persons to whom the Software is


 * furnished to do so, subject to the following conditions:


 *


 * The above copyright notice and this permission notice shall be included in


 * all copies or substantial portions of the Software.


 *


 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR


 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,


 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE


 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER


 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,


 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN


 * THE SOFTWARE.


 *


 * @package	CodeIgniter


 * @author	EllisLab Dev Team


 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)


 * @copyright	Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)


 * @license	https://opensource.org/licenses/MIT	MIT License


 * @link	https://codeigniter.com


 * @since	Version 1.0.0


 * @filesource


 */


defined('BASEPATH') OR exit('No direct script access allowed');





/**


 * CodeIgniter Calendar Class


 *


 * This class enables the creation of calendars


 *


 * @package		CodeIgniter


 * @subpackage	Libraries


 * @category	Libraries


 * @author		EllisLab Dev Team


 * @link		https://codeigniter.com/user_guide/libraries/calendar.html


 */


class CI_Calendar {





	/**


	 * Calendar layout template


	 *


	 * @var mixed


	 */


	public $template = '';





	/**


	 * Replacements array for template


	 *


	 * @var array


	 */


	public $replacements = array();





	/**


	 * Day of the week to start the calendar on


	 *


	 * @var string


	 */


	public $start_day = 'sunday';





	/**


	 * How to display months


	 *


	 * @var string


	 */


	public $month_type = 'long';





	/**


	 * How to display names of days


	 *


	 * @var string


	 */


	public $day_type = 'abr';





	/**


	 * Whether to show next/prev month links


	 *


	 * @var bool


	 */


	public $show_next_prev = FALSE;





	/**


	 * Url base to use for next/prev month links


	 *


	 * @var bool


	 */


	public $next_prev_url = '';





	/**


	 * Show days of other months


	 *


	 * @var bool


	 */


	public $show_other_days = FALSE;





	// --------------------------------------------------------------------





	/**


	 * CI Singleton


	 *


	 * @var object


	 */


	protected $CI;





	// --------------------------------------------------------------------





	/**


	 * Class constructor


	 *


	 * Loads the calendar language file and sets the default time reference.


	 *


	 * @uses	CI_Lang::$is_loaded


	 *


	 * @param	array	$config	Calendar options


	 * @return	void


	 */


	public function __construct($config = array())


	{


		$this->CI =& get_instance();


		$this->CI->lang->load('calendar');





		empty($config) OR $this->initialize($config);





		log_message('info', 'Calendar Class Initialized');


	}





	// --------------------------------------------------------------------





	/**


	 * Initialize the user preferences


	 *


	 * Accepts an associative array as input, containing display preferences


	 *


	 * @param	array	config preferences


	 * @return	CI_Calendar


	 */


	public function initialize($config = array())


	{


		foreach ($config as $key => $val)


		{


			if (isset($this->$key))


			{


				$this->$key = $val;


			}


		}





		// Set the next_prev_url to the controller if required but not defined


		if ($this->show_next_prev === TRUE && empty($this->next_prev_url))


		{


			$this->next_prev_url = $this->CI->config->site_url($this->CI->router->class.'/'.$this->CI->router->method);


		}





		return $this;


	}





	// --------------------------------------------------------------------





	/**


	 * Generate the calendar


	 *


	 * @param	int	the year


	 * @param	int	the month


	 * @param	array	the data to be shown in the calendar cells


	 * @return	string


	 */


	public function generate($year = '', $month = '', $data = array())


	{


		$local_time = time();





		// Set and validate the supplied month/year


		if (empty($year))


		{


			$year = date('Y', $local_time);


		}


		elseif (strlen($year) === 1)


		{


			$year = '200'.$year;


		}


		elseif (strlen($year) === 2)


		{


			$year = '20'.$year;


		}





		if (empty($month))


		{


			$month = date('m', $local_time);


		}


		elseif (strlen($month) === 1)


		{


			$month = '0'.$month;


		}





		$adjusted_date = $this->adjust_date($month, $year);





		$month	= $adjusted_date['month'];


		$year	= $adjusted_date['year'];





		// Determine the total days in the month


		$total_days = $this->get_total_days($month, $year);





		// Set the starting day of the week


		$start_days	= array('sunday' => 0, 'monday' => 1, 'tuesday' => 2, 'wednesday' => 3, 'thursday' => 4, 'friday' => 5, 'saturday' => 6);


		$start_day	= isset($start_days[$this->start_day]) ? $start_days[$this->start_day] : 0;





		// Set the starting day number


		$local_date = mktime(12, 0, 0, $month, 1, $year);


		$date = getdate($local_date);


		$day  = $start_day + 1 - $date['wday'];





		while ($day > 1)


		{


			$day -= 7;


		}





		// Set the current month/year/day


		// We use this to determine the "today" date


		$cur_year	= date('Y', $local_time);


		$cur_month	= date('m', $local_time);


		$cur_day	= date('j', $local_time);





		$is_current_month = ($cur_year == $year && $cur_month == $month);





		// Generate the template data array


		$this->parse_template();





		// Begin building the calendar output


		$out = $this->replacements['table_open']."\n\n".$this->replacements['heading_row_start']."\n";





		// "previous" month link


		if ($this->show_next_prev === TRUE)


		{


			// Add a trailing slash to the URL if needed


			$this->next_prev_url = preg_replace('/(.+?)\/*$/', '\\1/', $this->next_prev_url);





			$adjusted_date = $this->adjust_date($month - 1, $year);


			$out .= str_replace('{previous_url}', $this->next_prev_url.$adjusted_date['year'].'/'.$adjusted_date['month'], $this->replacements['heading_previous_cell'])."\n";


		}





		// Heading containing the month/year


		$colspan = ($this->show_next_prev === TRUE) ? 5 : 7;





		$this->replacements['heading_title_cell'] = str_replace('{colspan}', $colspan,


								str_replace('{heading}', $this->get_month_name($month).'&nbsp;'.$year, $this->replacements['heading_title_cell']));





		$out .= $this->replacements['heading_title_cell']."\n";





		// "next" month link


		if ($this->show_next_prev === TRUE)


		{


			$adjusted_date = $this->adjust_date($month + 1, $year);


			$out .= str_replace('{next_url}', $this->next_prev_url.$adjusted_date['year'].'/'.$adjusted_date['month'], $this->replacements['heading_next_cell']);


		}





		$out .= "\n".$this->replacements['heading_row_end']."\n\n"


			// Write the cells containing the days of the week


			.$this->replacements['week_row_start']."\n";





		$day_names = $this->get_day_names();





		for ($i = 0; $i < 7; $i ++)


		{


			$out .= str_replace('{week_day}', $day_names[($start_day + $i) %7], $this->replacements['week_day_cell']);


		}





		$out .= "\n".$this->replacements['week_row_end']."\n";





		// Build the main body of the calendar


		while ($day <= $total_days)


		{


			$out .= "\n".$this->replacements['cal_row_start']."\n";





			for ($i = 0; $i < 7; $i++)


			{


				if ($day > 0 && $day <= $total_days)


				{


					$out .= ($is_current_month === TRUE && $day == $cur_day) ? $this->replacements['cal_cell_start_today'] : $this->replacements['cal_cell_start'];





					if (isset($data[$day]))


					{


						// Cells with content


						$temp = ($is_current_month === TRUE && $day == $cur_day) ?


								$this->replacements['cal_cell_content_today'] : $this->replacements['cal_cell_content'];


						$out .= str_replace(array('{content}', '{day}'), array($data[$day], $day), $temp);


					}


					else


					{


						// Cells with no content


						$temp = ($is_current_month === TRUE && $day == $cur_day) ?


								$this->replacements['cal_cell_no_content_today'] : $this->replacements['cal_cell_no_content'];


						$out .= str_replace('{day}', $day, $temp);


					}





					$out .= ($is_current_month === TRUE && $day == $cur_day) ? $this->replacements['cal_cell_end_today'] : $this->replacements['cal_cell_end'];


				}


				elseif ($this->show_other_days === TRUE)


				{


					$out .= $this->replacements['cal_cell_start_other'];





					if ($day <= 0)


					{


						// Day of previous month


						$prev_month = $this->adjust_date($month - 1, $year);


						$prev_month_days = $this->get_total_days($prev_month['month'], $prev_month['year']);


						$out .= str_replace('{day}', $prev_month_days + $day, $this->replacements['cal_cell_other']);


					}


					else


					{


						// Day of next month


						$out .= str_replace('{day}', $day - $total_days, $this->replacements['cal_cell_other']);


					}





					$out .= $this->replacements['cal_cell_end_other'];


				}


				else


				{


					// Blank cells


					$out .= $this->replacements['cal_cell_start'].$this->replacements['cal_cell_blank'].$this->replacements['cal_cell_end'];


				}





				$day++;


			}





			$out .= "\n".$this->replacements['cal_row_end']."\n";


		}





		return $out .= "\n".$this->replacements['table_close'];


	}





	// --------------------------------------------------------------------





	/**


	 * Get Month Name


	 *


	 * Generates a textual month name based on the numeric


	 * month provided.


	 *


	 * @param	int	the month


	 * @return	string


	 */


	public function get_month_name($month)


	{


		if ($this->month_type === 'short')


		{


			$month_names = array('01' => 'cal_jan', '02' => 'cal_feb', '03' => 'cal_mar', '04' => 'cal_apr', '05' => 'cal_may', '06' => 'cal_jun', '07' => 'cal_jul', '08' => 'cal_aug', '09' => 'cal_sep', '10' => 'cal_oct', '11' => 'cal_nov', '12' => 'cal_dec');


		}


		else


		{


			$month_names = array('01' => 'cal_january', '02' => 'cal_february', '03' => 'cal_march', '04' => 'cal_april', '05' => 'cal_mayl', '06' => 'cal_june', '07' => 'cal_july', '08' => 'cal_august', '09' => 'cal_september', '10' => 'cal_october', '11' => 'cal_november', '12' => 'cal_december');


		}





		return ($this->CI->lang->line($month_names[$month]) === FALSE)


			? ucfirst(substr($month_names[$month], 4))


			: $this->CI->lang->line($month_names[$month]);


	}





	// --------------------------------------------------------------------





	/**


	 * Get Day Names


	 *


	 * Returns an array of day names (Sunday, Monday, etc.) based


	 * on the type. Options: long, short, abr


	 *


	 * @param	string


	 * @return	array


	 */


	public function get_day_names($day_type = '')


	{


		if ($day_type !== '')


		{


			$this->day_type = $day_type;


		}





		if ($this->day_type === 'long')


		{


			$day_names = array('sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday');


		}


		elseif ($this->day_type === 'short')


		{


			$day_names = array('sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat');


		}


		else


		{


			$day_names = array('su', 'mo', 'tu', 'we', 'th', 'fr', 'sa');


		}





		$days = array();


		for ($i = 0, $c = count($day_names); $i < $c; $i++)


		{


			$days[] = ($this->CI->lang->line('cal_'.$day_names[$i]) === FALSE) ? ucfirst($day_names[$i]) : $this->CI->lang->line('cal_'.$day_names[$i]);


		}





		return $days;


	}





	// --------------------------------------------------------------------





	/**


	 * Adjust Date


	 *


	 * This function makes sure that we have a valid month/year.


	 * For example, if you submit 13 as the month, the year will


	 * increment and the month will become January.


	 *


	 * @param	int	the month


	 * @param	int	the year


	 * @return	array


	 */


	public function adjust_date($month, $year)


	{


		$date = array();





		$date['month']	= $month;


		$date['year']	= $year;





		while ($date['month'] > 12)


		{


			$date['month'] -= 12;


			$date['year']++;


		}





		while ($date['month'] <= 0)


		{


			$date['month'] += 12;


			$date['year']--;


		}





		if (strlen($date['month']) === 1)


		{


			$date['month'] = '0'.$date['month'];


		}





		return $date;


	}





	// --------------------------------------------------------------------





	/**


	 * Total days in a given month


	 *


	 * @param	int	the month


	 * @param	int	the year


	 * @return	int


	 */


	public function get_total_days($month, $year)


	{


		$this->CI->load->helper('date');


		return days_in_month($month, $year);


	}





	// --------------------------------------------------------------------





	/**


	 * Set Default Template Data


	 *


	 * This is used in the event that the user has not created their own template


	 *


	 * @return	array


	 */


	public function default_template()


	{


		return array(


			'table_open'				=> '<table border="0" cellpadding="4" cellspacing="0">',


			'heading_row_start'			=> '<tr>',


			'heading_previous_cell'		=> '<th><a href="{previous_url}">&lt;&lt;</a></th>',


			'heading_title_cell'		=> '<th colspan="{colspan}">{heading}</th>',


			'heading_next_cell'			=> '<th><a href="{next_url}">&gt;&gt;</a></th>',


			'heading_row_end'			=> '</tr>',


			'week_row_start'			=> '<tr>',


			'week_day_cell'				=> '<td>{week_day}</td>',


			'week_row_end'				=> '</tr>',


			'cal_row_start'				=> '<tr>',


			'cal_cell_start'			=> '<td>',


			'cal_cell_start_today'		=> '<td>',


			'cal_cell_start_other'		=> '<td style="color: #666;">',


			'cal_cell_content'			=> '<a href="{content}">{day}</a>',


			'cal_cell_content_today'	=> '<a href="{content}"><strong>{day}</strong></a>',


			'cal_cell_no_content'		=> '{day}',


			'cal_cell_no_content_today'	=> '<strong>{day}</strong>',


			'cal_cell_blank'			=> '&nbsp;',


			'cal_cell_other'			=> '{day}',


			'cal_cell_end'				=> '</td>',


			'cal_cell_end_today'		=> '</td>',


			'cal_cell_end_other'		=> '</td>',


			'cal_row_end'				=> '</tr>',


			'table_close'				=> '</table>'


		);


	}





	// --------------------------------------------------------------------





	/**


	 * Parse Template


	 *


	 * Harvests the data within the template {pseudo-variables}


	 * used to display the calendar


	 *


	 * @return	CI_Calendar


	 */


	public function parse_template()


	{


		$this->replacements = $this->default_template();





		if (empty($this->template))


		{


			return $this;


		}





		if (is_string($this->template))


		{


			$today = array('cal_cell_start_today', 'cal_cell_content_today', 'cal_cell_no_content_today', 'cal_cell_end_today');





			foreach (array('table_open', 'table_close', 'heading_row_start', 'heading_previous_cell', 'heading_title_cell', 'heading_next_cell', 'heading_row_end', 'week_row_start', 'week_day_cell', 'week_row_end', 'cal_row_start', 'cal_cell_start', 'cal_cell_content', 'cal_cell_no_content', 'cal_cell_blank', 'cal_cell_end', 'cal_row_end', 'cal_cell_start_today', 'cal_cell_content_today', 'cal_cell_no_content_today', 'cal_cell_end_today', 'cal_cell_start_other', 'cal_cell_other', 'cal_cell_end_other') as $val)


			{


				if (preg_match('/\{'.$val.'\}(.*?)\{\/'.$val.'\}/si', $this->template, $match))


				{


					$this->replacements[$val] = $match[1];


				}


				elseif (in_array($val, $today, TRUE))


				{


					$this->replacements[$val] = $this->replacements[substr($val, 0, -6)];


				}


			}


		}


		elseif (is_array($this->template))


		{


			$this->replacements = array_merge($this->replacements, $this->template);


		}





		return $this;


	}





}


