<?php
namespace Smarty\FunctionHandler;

use Smarty\Template;

/**
 * Smarty {html_select_date} plugin
 * Type:     function
 * Name:     html_select_date
 * Purpose:  Prints the dropdowns for date selection.
 * ChangeLog:
 *
 *            - 1.0 initial release
 *            - 1.1 added support for +/- N syntax for begin
 *              and end year values. (Monte)
 *            - 1.2 added support for yyyy-mm-dd syntax for
 *              time value. (Jan Rosier)
 *            - 1.3 added support for choosing format for
 *              month values (Gary Loescher)
 *            - 1.3.1 added support for choosing format for
 *              day values (Marcus Bointon)
 *            - 1.3.2 support negative timestamps, force year
 *              dropdown to include given date unless explicitly set (Monte)
 *            - 1.3.4 fix behaviour of 0000-00-00 00:00:00 dates to match that
 *              of 0000-00-00 dates (cybot, boots)
 *            - 2.0 complete rewrite for performance,
 *              added attributes month_names, *_id
 *
 * @version 2.0
 * @author  Andrei Zmievski
 * @author  Monte Ohrt <monte at ohrt dot com>
 * @author  Rodney Rehm
 *
 * @param array                     $params parameters
 *
 * @param \Smarty\Template $template
 *
 * @return string
 * @throws \Smarty\Exception
 */
class HtmlSelectDate extends Base {

	public function handle($params, Template $template) {
		// generate timestamps used for month names only
		static $_month_timestamps = null;
		static $_current_year = null;
		if ($_month_timestamps === null) {
			$_current_year = date('Y');
			$_month_timestamps = [];
			for ($i = 1; $i <= 12; $i++) {
				$_month_timestamps[$i] = mktime(0, 0, 0, $i, 1, 2000);
			}
		}
		/* Default values. */
		$prefix = 'Date_';
		$start_year = null;
		$end_year = null;
		$display_days = true;
		$display_months = true;
		$display_years = true;
		$month_format = '%B';
		/* Write months as numbers by default  GL */
		$month_value_format = '%m';
		$day_format = '%02d';
		/* Write day values using this format MB */
		$day_value_format = '%d';
		$year_as_text = false;
		/* Display years in reverse order? Ie. 2000,1999,.... */
		$reverse_years = false;
		/* Should the select boxes be part of an array when returned from PHP?
		   e.g. setting it to "birthday", would create "birthday[Day]",
		   "birthday[Month]" & "birthday[Year]". Can be combined with prefix */
		$field_array = null;
		/* <select size>'s of the different <select> tags.
		   If not set, uses default dropdown. */
		$day_size = null;
		$month_size = null;
		$year_size = null;
		/* Unparsed attributes common to *ALL* the <select>/<input> tags.
		   An example might be in the template: all_extra ='class ="foo"'. */
		$all_extra = null;
		/* Separate attributes for the tags. */
		$day_extra = null;
		$month_extra = null;
		$year_extra = null;
		/* Order in which to display the fields.
		   "D" -> day, "M" -> month, "Y" -> year. */
		$field_order = 'MDY';
		/* String printed between the different fields. */
		$field_separator = "\n";
		$option_separator = "\n";
		$time = null;

		// $all_empty = null;
		// $day_empty = null;
		// $month_empty = null;
		// $year_empty = null;
		$extra_attrs = '';
		$all_id = null;
		$day_id = null;
		$month_id = null;
		$year_id = null;
		foreach ($params as $_key => $_value) {
			switch ($_key) {
				case 'time':
					$$_key = $_value; // we'll handle conversion below
					break;
				case 'month_names':
					if (is_array($_value) && count($_value) === 12) {
						$$_key = $_value;
					} else {
						trigger_error('html_select_date: month_names must be an array of 12 strings', E_USER_NOTICE);
					}
					break;
				case 'prefix':
				case 'field_array':
				case 'start_year':
				case 'end_year':
				case 'day_format':
				case 'day_value_format':
				case 'month_format':
				case 'month_value_format':
				case 'day_size':
				case 'month_size':
				case 'year_size':
				case 'all_extra':
				case 'day_extra':
				case 'month_extra':
				case 'year_extra':
				case 'field_order':
				case 'field_separator':
				case 'option_separator':
				case 'all_empty':
				case 'month_empty':
				case 'day_empty':
				case 'year_empty':
				case 'all_id':
				case 'month_id':
				case 'day_id':
				case 'year_id':
					$$_key = (string)$_value;
					break;
				case 'display_days':
				case 'display_months':
				case 'display_years':
				case 'year_as_text':
				case 'reverse_years':
					$$_key = (bool)$_value;
					break;
				default:
					if (!is_array($_value)) {
						$extra_attrs .= ' ' . $_key . '="' . smarty_function_escape_special_chars($_value) . '"';
					} else {
						trigger_error("html_select_date: extra attribute '{$_key}' cannot be an array", E_USER_NOTICE);
					}
					break;
			}
		}
		// Note: date() is faster than strftime()
		// Note: explode(date()) is faster than date() date() date()

		if (isset($time) && is_array($time)) {
			if (isset($time[$prefix . 'Year'])) {
				// $_REQUEST[$field_array] given
				foreach ([
					         'Y' => 'Year',
					         'm' => 'Month',
					         'd' => 'Day'
				         ] as $_elementKey => $_elementName) {
					$_variableName = '_' . strtolower($_elementName);
					$$_variableName =
						$time[$prefix . $_elementName] ?? date($_elementKey);
				}
			} elseif (isset($time[$field_array][$prefix . 'Year'])) {
				// $_REQUEST given
				foreach ([
					         'Y' => 'Year',
					         'm' => 'Month',
					         'd' => 'Day'
				         ] as $_elementKey => $_elementName) {
					$_variableName = '_' . strtolower($_elementName);
					$$_variableName = $time[$field_array][$prefix . $_elementName] ?? date($_elementKey);
				}
			} else {
				// no date found, use NOW
				[$_year, $_month, $_day] = explode('-', date('Y-m-d'));
			}
		} elseif (isset($time) && preg_match("/(\d*)-(\d*)-(\d*)/", $time, $matches)) {
			$_year = $_month = $_day = null;
			if ($matches[1] > '') {
				$_year = (int)$matches[1];
			}
			if ($matches[2] > '') {
				$_month = (int)$matches[2];
			}
			if ($matches[3] > '') {
				$_day = (int)$matches[3];
			}
		} elseif ($time === null) {
			if (array_key_exists('time', $params)) {
				$_year = $_month = $_day = null;
			} else {
				[$_year, $_month, $_day] = explode('-', date('Y-m-d'));
			}
		} else {
			$time = smarty_make_timestamp($time);
			[$_year, $_month, $_day] = explode('-', date('Y-m-d', $time));
		}

		// make syntax "+N" or "-N" work with $start_year and $end_year
		// Note preg_match('!^(\+|\-)\s*(\d+)$!', $end_year, $match) is slower than trim+substr
		foreach ([
			         'start',
			         'end'
		         ] as $key) {
			$key .= '_year';
			$t = $$key;
			if ($t === null) {
				$$key = (int)$_current_year;
			} elseif ($t[0] === '+') {
				$$key = (int)($_current_year + (int)trim(substr($t, 1)));
			} elseif ($t[0] === '-') {
				$$key = (int)($_current_year - (int)trim(substr($t, 1)));
			} else {
				$$key = (int)$$key;
			}
		}
		// flip for ascending or descending
		if (($start_year > $end_year && !$reverse_years) || ($start_year < $end_year && $reverse_years)) {
			$t = $end_year;
			$end_year = $start_year;
			$start_year = $t;
		}
		// generate year <select> or <input>
		if ($display_years) {
			$_extra = '';
			$_name = $field_array ? ($field_array . '[' . $prefix . 'Year]') : ($prefix . 'Year');
			if ($all_extra) {
				$_extra .= ' ' . $all_extra;
			}
			if ($year_extra) {
				$_extra .= ' ' . $year_extra;
			}
			if ($year_as_text) {
				$_html_years =
					'<input type="text" name="' . $_name . '" value="' . $_year . '" size="4" maxlength="4"' . $_extra .
					$extra_attrs . ' />';
			} else {
				$_html_years = '<select name="' . $_name . '"';
				if ($year_id !== null || $all_id !== null) {
					$_html_years .= ' id="' . smarty_function_escape_special_chars(
							$year_id !== null ?
								($year_id ? $year_id : $_name) :
								($all_id ? ($all_id . $_name) :
									$_name)
						) . '"';
				}
				if ($year_size) {
					$_html_years .= ' size="' . $year_size . '"';
				}
				$_html_years .= $_extra . $extra_attrs . '>' . $option_separator;
				if (isset($year_empty) || isset($all_empty)) {
					$_html_years .= '<option value="">' . (isset($year_empty) ? $year_empty : $all_empty) . '</option>' .
						$option_separator;
				}
				$op = $start_year > $end_year ? -1 : 1;
				for ($i = $start_year; $op > 0 ? $i <= $end_year : $i >= $end_year; $i += $op) {
					$_html_years .= '<option value="' . $i . '"' . ($_year == $i ? ' selected="selected"' : '') . '>' . $i .
						'</option>' . $option_separator;
				}
				$_html_years .= '</select>';
			}
		}
		// generate month <select> or <input>
		if ($display_months) {
			$_extra = '';
			$_name = $field_array ? ($field_array . '[' . $prefix . 'Month]') : ($prefix . 'Month');
			if ($all_extra) {
				$_extra .= ' ' . $all_extra;
			}
			if ($month_extra) {
				$_extra .= ' ' . $month_extra;
			}
			$_html_months = '<select name="' . $_name . '"';
			if ($month_id !== null || $all_id !== null) {
				$_html_months .= ' id="' . smarty_function_escape_special_chars(
						$month_id !== null ?
							($month_id ? $month_id : $_name) :
							($all_id ? ($all_id . $_name) :
								$_name)
					) . '"';
			}
			if ($month_size) {
				$_html_months .= ' size="' . $month_size . '"';
			}
			$_html_months .= $_extra . $extra_attrs . '>' . $option_separator;
			if (isset($month_empty) || isset($all_empty)) {
				$_html_months .= '<option value="">' . (isset($month_empty) ? $month_empty : $all_empty) . '</option>' .
					$option_separator;
			}
			for ($i = 1; $i <= 12; $i++) {
				$_val = sprintf('%02d', $i);
				$_text = isset($month_names) ? smarty_function_escape_special_chars($month_names[$i]) :
					($month_format === '%m' ? $_val : @strftime($month_format, $_month_timestamps[$i]));
				$_value = $month_value_format === '%m' ? $_val : @strftime($month_value_format, $_month_timestamps[$i]);
				$_html_months .= '<option value="' . $_value . '"' . ($_val == $_month ? ' selected="selected"' : '') .
					'>' . $_text . '</option>' . $option_separator;
			}
			$_html_months .= '</select>';
		}
		// generate day <select> or <input>
		if ($display_days) {
			$_extra = '';
			$_name = $field_array ? ($field_array . '[' . $prefix . 'Day]') : ($prefix . 'Day');
			if ($all_extra) {
				$_extra .= ' ' . $all_extra;
			}
			if ($day_extra) {
				$_extra .= ' ' . $day_extra;
			}
			$_html_days = '<select name="' . $_name . '"';
			if ($day_id !== null || $all_id !== null) {
				$_html_days .= ' id="' .
					smarty_function_escape_special_chars(
						$day_id !== null ? ($day_id ? $day_id : $_name) :
							($all_id ? ($all_id . $_name) : $_name)
					) . '"';
			}
			if ($day_size) {
				$_html_days .= ' size="' . $day_size . '"';
			}
			$_html_days .= $_extra . $extra_attrs . '>' . $option_separator;
			if (isset($day_empty) || isset($all_empty)) {
				$_html_days .= '<option value="">' . (isset($day_empty) ? $day_empty : $all_empty) . '</option>' .
					$option_separator;
			}
			for ($i = 1; $i <= 31; $i++) {
				$_val = sprintf('%02d', $i);
				$_text = $day_format === '%02d' ? $_val : sprintf($day_format, $i);
				$_value = $day_value_format === '%02d' ? $_val : sprintf($day_value_format, $i);
				$_html_days .= '<option value="' . $_value . '"' . ($_val == $_day ? ' selected="selected"' : '') . '>' .
					$_text . '</option>' . $option_separator;
			}
			$_html_days .= '</select>';
		}
		// order the fields for output
		$_html = '';
		for ($i = 0; $i <= 2; $i++) {
			switch ($field_order[$i]) {
				case 'Y':
				case 'y':
					if (isset($_html_years)) {
						if ($_html) {
							$_html .= $field_separator;
						}
						$_html .= $_html_years;
					}
					break;
				case 'm':
				case 'M':
					if (isset($_html_months)) {
						if ($_html) {
							$_html .= $field_separator;
						}
						$_html .= $_html_months;
					}
					break;
				case 'd':
				case 'D':
					if (isset($_html_days)) {
						if ($_html) {
							$_html .= $field_separator;
						}
						$_html .= $_html_days;
					}
					break;
			}
		}
		return $_html;
	}
}