/* http://keith-wood.name/datepick.html
   Datepicker Validation extension for jQuery 3.5.1.
   Requires Jörn Zaefferer's Validation plugin (http://plugins.jquery.com/project/validate).
   Written by Keith Wood (kbwood@virginbroadband.com.au).
   Dual licensed under the GPL (http://dev.jquery.com/browser/trunk/jquery/GPL-LICENSE.txt) and 
   MIT (http://dev.jquery.com/browser/trunk/jquery/MIT-LICENSE.txt) licenses. 
   Please attribute the authors if you use it. */

(function($) { // hide the namespace

$.datepick._selectDate2 = $.datepick._selectDate;

$.extend($.datepick, {

	/* Trigger a validation after updating the input field with the selected date.
	   @param  id       (string) the ID of the target field
	   @param  dateStr  (string) the chosen date */
	_selectDate: function(id, dateStr) {
		this._selectDate2(id, dateStr);
		var inst = this._getInst($(id)[0]);
		if (!inst.inline && $.fn.validate)
			$(id).parents('form').each(function() { $(this).valid(); });
	},

	/* Correct error placement for validation errors - after any trigger.
	   @param  error    (jQuery) the error message
	   @param  element  (jQuery) the field in error */
	errorPlacement: function(error, element) {
		var trigger = element.next('.' + $.datepick._triggerClass);
		error.insertAfter(trigger.length > 0 ? trigger : element);
	},

	/* Format a validation error message involving dates.
	   @param  source  (string) the error message
	   @param  params  (Date[]) the dates
	   @return  (string) the formatted message */
	errorFormat: function(source, params) {
		var format = ($.datepick._curInst ?
			$.datepick._get($.datepick._curInst, 'dateFormat') :
			$.datepick._defaults.dateFormat);
		$.each(params, function(i, v) {
			source = source.replace(new RegExp('\\{' + i + '\\}', 'g'),
				$.datepick.formatDate(format, v) || 'nothing');
		});
		return source;
	}
});

/* Apply a validation test to each date provided.
   @param  value    (string) the current field value
   @param  element  (element) the field control
   @param  test     (function) the validation to apply
   @return  (boolean) true if OK, false if failed validation */
function validateEach(value, element, test) {
	var inst = $.datepick._getInst(element);
	var dates = ($.datepick._get(inst, 'rangeSelect') ?
		value.split($.datepick._get(inst, 'rangeSeparator')) : [value]);
	var ok = true;
	try {
		$.each(dates, function(i, v) {
			var date = $.datepick.parseDate($.datepick._get(inst, 'dateFormat'), v);
			ok = ok && test(date);
		});
	}
	catch (e) {
		ok = false;
	}
	return ok;
}

/* Add validation methods if validation plugin available. */
if ($.fn.validate) {
	/* Validate basic date format. */
	$.validator.addMethod('dpDate', function(value, element) {
			return this.optional(element) ||
				validateEach(value, element, function(date) { return true; });
		}, '<br>Please enter a valid date');

	/* Validate format and against a minimum date. */
	$.validator.addMethod('dpMinDate', function(value, element, params) {
			var inst = $.datepick._getInst(element);
			params[0] = $.datepick._determineDate($.datepick._get(inst, 'minDate'), null);
			return this.optional(element) ||
				validateEach(value, element, function(date) {
					return (!date || !params[0] || date >= params[0]);
				});
		}, function(params) {
			return $.datepick.errorFormat('Please enter a date on or after {0}', params);
		});

	/* Validate format and against a maximum date. */
	$.validator.addMethod('dpMaxDate', function(value, element, params) {
			var inst = $.datepick._getInst(element);
			params[0] = $.datepick._determineDate($.datepick._get(inst, 'maxDate'), null);
			return this.optional(element) ||
				validateEach(value, element, function(date) {
					return (!date || !params[0] || date <= params[0]);
				});
		}, function(params) {
			return $.datepick.errorFormat('Please enter a date on or before {0}', params);
		});

	/* Validate format and against minimum/maximum dates. */
	$.validator.addMethod('dpMinMaxDate', function(value, element, params) {
			var inst = $.datepick._getInst(element);
			params[0] = $.datepick._determineDate($.datepick._get(inst, 'minDate'), null);
			params[1] = $.datepick._determineDate($.datepick._get(inst, 'maxDate'), null);
			return this.optional(element) ||
				validateEach(value, element, function(date) {
					return (!date || ((!params[0] || date >= params[0]) &&
						(!params[1] || date <= params[1])));
				});
		}, function(params) {
			return $.datepick.errorFormat('Please enter a date between {0} and {1}', params);
		});
}

})(jQuery);