/* 
 * Author: @senthil2rajan
 * plugin: timepicker
 * website: senthilraj.github.io/Timepicki
 */
(function($) {

	$.fn.timepicki = function(options) {

		var defaults = {
			format_output: function(tim, mini, meri) {
			    if (settings.show_meridian) {
                    // limit hours between 1 and 12 - inculsive.
			        tim = Math.min(Math.max(parseInt(tim), 1), 12);
			        if (tim < 10)
			            tim = "0" + tim;

			        
			        mini = Math.min(Math.max(parseInt(mini), 0), 59);
			        if (mini < 10)
			            mini = "0" + mini;

					return tim + ":" + mini + " " + meri;
			    } else {

			        // limit hours between 0 and 23 - inculsive.
			        tim = Math.min(Math.max(parseInt(tim), 0), 23);

			        if (tim < 10)
			            tim = "0" + tim;


			        mini = Math.min(Math.max(parseInt(mini), 0), 59);
			        if (mini < 10)
			            mini = "0" + mini;

			        mini = Math.min(Math.max(parseInt(mini), 0), 59);

					return tim + ":" + mini;
				}
			},
			increase_direction: 'up',
			custom_classes: '',
			min_hour_value: 1,
			max_hour_value: 12,
			show_meridian: true,
			step_size_hours: '1',
			step_size_minutes: '1',
			overflow_minutes: false,
			disable_keyboard_mobile: false,
			reset: false,
			on_change: null,
      			input_writable: false
		};

		var settings = $.extend({}, defaults, options);

		return this.each(function() {

			var ele = $(this);
			var ele_hei = ele.outerHeight();
			ele_hei += 10;
			$(ele).wrap("<div class='time_pick'>");
			var ele_par = $(this).parents(".time_pick");

			// developer can specify which arrow makes the numbers go up or down
			var top_arrow_button = (settings.increase_direction === 'down') ?
				"<div class='prev action-prev'></div>" :
				"<div class='prev action-next'></div>";
			var bottom_arrow_button = (settings.increase_direction === 'down') ?
				"<div class='next action-next'></div>" :
				"<div class='next action-prev'></div>";

			var new_ele = $(
				"<div class='timepicker_wrap " + settings.custom_classes + "'>" +
					"<div class='arrow_top'></div>" +
					"<div class='time'>" +
						top_arrow_button +
						"<div class='ti_tx'><input type='text' class='timepicki-input'" + (settings.disable_keyboard_mobile ? "readonly" : "") + "></div>" +
						bottom_arrow_button +
					"</div>" +
					"<div class='mins'>" +
						top_arrow_button +
						"<div class='mi_tx'><input type='text' class='timepicki-input'" + (settings.disable_keyboard_mobile ? "readonly" : "") + "></div>" +
						bottom_arrow_button +
					"</div>");
			if(settings.show_meridian){
				new_ele.append(
					"<div class='meridian'>" +
						top_arrow_button +
						"<div class='mer_tx'><input type='text' class='timepicki-input' readonly></div>" +
						bottom_arrow_button +
					"</div>");
			}
			if(settings.reset){
				new_ele.append(
					"<div><a href='#' class='reset_time'>Reset</a></div>");
			}
			ele_par.append(new_ele);
			var ele_next = $(this).next(".timepicker_wrap");
			var ele_next_all_child = ele_next.find("div");
			var inputs = ele_par.find('input');
			
			$('.reset_time').on("click", function(event) {
				ele.val("");
				close_timepicki();
			});

			$(".timepicki-input").keydown(function (keyevent) {
			    // our goal here is very simple.
			    // no matter what the user presses
			    // we must ensure that the values in our
			    // timepicki inputs are valid, and that pressing
			    // enter does not submit the form if the
			    // input field on which timepicki is applied is a part of a form.
			    
			    
			    // With that in mind. We proceed like this:
			    // 1) If enter is pressed:
			    //      i) Prevent default operations - form submission.
                //      ii) close_timepicki().
			    //      iii) return.
                //
			    // 2) For any other key presses:
			    //      i) realize that we cannot check what the user has typed
			    //         just yet, because this function is a handler
			    //         that runs before any text is rendered in the input
			    //         box.
			    //      ii) So, register a function validate() that will execute right 
			    //          after the keypress character is rendered. All validation
                //          is done inside validate().
                //-----------------------------------------------------------------------------------
			    //  NOTE:.change() event does not work here, as it is called when input looses focus|
                //-----------------------------------------------------------------------------------

                // (1)
			    // prevent potential form submission, if enter is pressed.
			    if (keyevent.keyCode == 13) {

			        keyevent.preventDefault();

			        set_value();
			        close_timepicki();
			        // nothing to do here.
			        return;
			    }



			    // the grand father div specifies the type of 
			    // input that we are dealing with. if the grandFatherDiv
			    // has a class "time", then its a time input, if it has a class
			    // "mins", then its a minutes input, and if it has a class "meridian"
                // then its a meridian input.
			    var grandfatherDiv = $(this).parent().parent();

                // aliasing for readability
			    var input = $(this);

			    // pick the value from the field,
			    // because before change the field always has a
                // valid value.
			    var lastValue = input.val();

                // (2)
			    // validate() function validates the
			    // user input. 
			    function validate() {
			        
			        var isValidNumber = /^\d+$/.test(input.val());
			        var isEmpty = input.val() === "";
			        
                    
			        if (grandfatherDiv.hasClass("time")) { /// HOUR


			            // if its a valid number.
                        // clip it and assign it.
			            if (isValidNumber) {

                            // clip number.
			                var hours = (settings.show_meridian) ?
                            Math.min(Math.max(parseInt(input.val()), 1), 12) : // for 12 hour date picker.
			                Math.min(Math.max(parseInt(input.val()), 0), 23); // for 24 hours date picker.

			                // assign number.
			                input.val(hours);

			            } else if(!isEmpty) {
                            // else if the number is invalid and not empty
                            // assign the lastValue
			                input.val(lastValue);

			            }



			        } else if (grandfatherDiv.hasClass("mins")) { /// MINUTE


			            // if its a valid number.
			            // clip it and assign it.
			            if (isValidNumber) {

			                // clip number.
			                var minutes = Math.min(Math.max(parseInt(input.val()), 0), 59);

			                // assign number.
			                input.val(minutes);

			            } else if (!isEmpty) {
			                // else if the number is invalid and not empty
			                // assign the lastValue
			                input.val(lastValue);

			            }


			        } else if (grandfatherDiv.hasClass("meridian")) { /// MERIDIAN
			            // key presses should not affect
			            // meridian - except up and down
			            // which are handled else where
                        // and will still work.
			            keyevent.preventDefault();
			        } else {
                        // alert("This should not happen.");
			        }

			    }
			    
			    // wrapValidate() ensures that validate()
			    // is not called more than once. 'done'
                // is a flag used to ensure this.
			    done = false;
			    function wrapValidate() {
			        if (!done) {


                        validate();

			            done = true;
                    }
			    }
			    // enqueue wrapValidate function before any thing
			    // else takes place. For this we use setTimeout()
                // with 0
			    setTimeout(wrapValidate, 0);




					

			});

			// open or close time picker when clicking
			$(document).on("click", function(event) {
				if (!$(event.target).is(ele_next) && ele_next.css("display")=="block" && !$(event.target).is($('.reset_time'))) {
					if (!$(event.target).is(ele)) {
						set_value(event, !is_element_in_timepicki($(event.target)));
					} else {
						var ele_lef =  0;
						
						ele_next.css({
							"top": ele_hei + "px",
							"left": ele_lef + "px"
						});
						open_timepicki();
					}
				}
			});

			// open the modal when the user focuses on the input
			ele.on('focus', open_timepicki);

			// select all text in input when user focuses on it
			inputs.on('focus', function() {
				var input = $(this);
				if (!input.is(ele)) {
					input.select();
				}
			});

			// allow user to increase and decrease numbers using arrow keys
			inputs.on('keydown', function(e) {
				var direction, input = $(this);

				// UP
				if (e.which === 38) {
					if (settings.increase_direction === 'down') {
						direction = 'prev';
					} else {
						direction = 'next';
					}
				// DOWN
				} else if (e.which === 40) {
					if (settings.increase_direction === 'down') {
						direction = 'next';
					} else {
						direction = 'prev';
					}
				}

				if (input.closest('.timepicker_wrap .time').length) {
					change_time(null, direction);
				} else if (input.closest('.timepicker_wrap .mins').length) {
					change_mins(null, direction);
				} else if (input.closest('.timepicker_wrap .meridian').length && settings.show_meridian) {
					change_meri(null, direction);
				}
			});

			// close the modal when the time picker loses keyboard focus
			inputs.on('blur', function() {
				setTimeout(function() {
					var focused_element = $(document.activeElement);
					if (focused_element.is(':input') && !is_element_in_timepicki(focused_element)) {
						set_value();
						close_timepicki();
					}
				}, 0);
			});

			function is_element_in_timepicki(jquery_element) {
				return $.contains(ele_par[0], jquery_element[0]) || ele_par.is(jquery_element);
			}

			function set_value(event, close) {
				// use input values to set the time
				var tim = ele_next.find(".ti_tx input").val();
				var mini = ele_next.find(".mi_tx input").val();
				var meri = "";
				if(settings.show_meridian){
					meri = ele_next.find(".mer_tx input").val();
				}
				
				if (tim.length !== 0 && mini.length !== 0 && (!settings.show_meridian || meri.length !== 0)) {
					// store the value so we can set the initial value
					// next time the picker is opened
					ele.attr('data-timepicki-tim', tim);
					ele.attr('data-timepicki-mini', mini);
					
					if(settings.show_meridian){
						ele.attr('data-timepicki-meri', meri);
						// set the formatted value
						ele.val(settings.format_output(tim, mini, meri));
					}else{
						ele.val(settings.format_output(tim, mini));
					}
				}

				//Call user on_change callback function if set
				if (settings.on_change !== null) {
					settings.on_change(ele[0]);
				}

				if (close) {
					close_timepicki();
				}
			}

			function open_timepicki() {
				set_date(settings.start_time);
				ele_next.fadeIn();
				if(!settings.input_writable) {
					// focus on the first input and select its contents
					var first_input = ele_next.find('input:visible').first();
					first_input.focus();
				}
				// if the user presses shift+tab while on the first input,
				// they mean to exit the time picker and go to the previous field
				var first_input_exit_handler = function(e) {
					if (e.which === 9 && e.shiftKey) {
						first_input.off('keydown', first_input_exit_handler);
						var all_form_elements = $(':input:visible:not(.timepicki-input)');
						var index_of_timepicki_input = all_form_elements.index(ele);
						var previous_form_element = all_form_elements.get(index_of_timepicki_input-1);
						previous_form_element.focus();
					}
				};
				first_input.on('keydown', first_input_exit_handler);
			}

			function close_timepicki() {
				ele_next.fadeOut();
			}

			function set_date(start_time) {
				var d, ti, mi, mer;

				// if a value was already picked we will remember that value
				if (ele.is('[data-timepicki-tim]')) {
					ti = Number(ele.attr('data-timepicki-tim'));
					mi = Number(ele.attr('data-timepicki-mini'));
					if(settings.show_meridian){
						mer = ele.attr('data-timepicki-meri');
					}
				// developer can specify a custom starting value
				} else if (typeof start_time === 'object') {
					ti = Number(start_time[0]);
					mi = Number(start_time[1]);
					if(settings.show_meridian){
						mer = start_time[2];
					}
				// default is we will use the current time
				} else {
					d = new Date();
					ti = d.getHours();
					mi = d.getMinutes();
					mer = "AM";
					if (settings.show_meridian){
						if (ti == 0) { // midnight 
							ti = 12;
						} else if (ti == 12) { // noon
							mer = "PM";
						} else if (ti > 12) {
							ti -= 12;
							mer = "PM";
						}
					}
				}

				if (ti < 10) {
					ele_next.find(".ti_tx input").val("0" + ti);
				} else {
					ele_next.find(".ti_tx input").val(ti);
				}
				if (mi < 10) {
					ele_next.find(".mi_tx input").val("0" + mi);
				} else {
					ele_next.find(".mi_tx input").val(mi);
				}
				if(settings.show_meridian){
					if (mer < 10) {
						ele_next.find(".mer_tx input").val("0" + mer);
					} else {
						ele_next.find(".mer_tx input").val(mer);
					}
				}
			}

			function change_time(cur_ele, direction) {
				var cur_cli = "time";
				var cur_time = Number(ele_next.find("." + cur_cli + " .ti_tx input").val());
				var ele_st = Number(settings.min_hour_value);
				var ele_en = Number(settings.max_hour_value);
				var step_size = Number(settings.step_size_hours);
				if ((cur_ele && cur_ele.hasClass('action-next')) || direction === 'next') {
					if (cur_time + step_size > ele_en) {
						var min_value = ele_st;
						if (min_value < 10) {
							min_value = '0' + min_value;
						} else {
							min_value = String(min_value);
						}
						ele_next.find("." + cur_cli + " .ti_tx input").val(min_value);
					} else {
						cur_time = cur_time + step_size;
						if (cur_time < 10) {
							cur_time = "0" + cur_time;
						}
						ele_next.find("." + cur_cli + " .ti_tx input").val(cur_time);
					}
				} else if ((cur_ele && cur_ele.hasClass('action-prev')) || direction === 'prev') {
					var minValue = Number(settings.min_hour_value)
					if (cur_time - step_size < minValue) {
						var max_value = ele_en;
						if (max_value < 10) {
							max_value = '0' + max_value;
						} else {
							max_value = String(max_value);
						}
						ele_next.find("." + cur_cli + " .ti_tx input").val(max_value);
					} else {
						cur_time = cur_time - step_size;
						if (cur_time < 10) {
							cur_time = "0" + cur_time;
						}
						ele_next.find("." + cur_cli + " .ti_tx input").val(cur_time);
					}
				}
			}

			function change_mins(cur_ele, direction) {
				var cur_cli = "mins";
				var cur_mins = Number(ele_next.find("." + cur_cli + " .mi_tx input").val());
				var ele_st = 0;
				var ele_en = 59;
				var step_size = Number(settings.step_size_minutes);
				if ((cur_ele && cur_ele.hasClass('action-next')) || direction === 'next') {
					if (cur_mins + step_size > ele_en) {
						ele_next.find("." + cur_cli + " .mi_tx input").val("00");
						if(settings.overflow_minutes){
							change_time(null, 'next');
						}
					} else {
						cur_mins = cur_mins + step_size;
						if (cur_mins < 10) {
							ele_next.find("." + cur_cli + " .mi_tx input").val("0" + cur_mins);
						} else {
							ele_next.find("." + cur_cli + " .mi_tx input").val(cur_mins);
						}
					}
				} else if ((cur_ele && cur_ele.hasClass('action-prev')) || direction === 'prev') {
					if (cur_mins - step_size <= -1) {
						ele_next.find("." + cur_cli + " .mi_tx input").val(ele_en + 1 - step_size);
						if(settings.overflow_minutes){
							change_time(null, 'prev');
						}
					} else {
						cur_mins = cur_mins - step_size;
						if (cur_mins < 10) {
							ele_next.find("." + cur_cli + " .mi_tx input").val("0" + cur_mins);
						} else {
							ele_next.find("." + cur_cli + " .mi_tx input").val(cur_mins);
						}
					}
				}
			}

			function change_meri(cur_ele, direction) {
				var cur_cli = "meridian";
				var ele_st = 0;
				var ele_en = 1;
				var cur_mer = null;
				cur_mer = ele_next.find("." + cur_cli + " .mer_tx input").val();
				if ((cur_ele && cur_ele.hasClass('action-next')) || direction === 'next') {
					if (cur_mer == "AM") {
						ele_next.find("." + cur_cli + " .mer_tx input").val("PM");
					} else {
						ele_next.find("." + cur_cli + " .mer_tx input").val("AM");
					}
				} else if ((cur_ele && cur_ele.hasClass('action-prev')) || direction === 'prev') {
					if (cur_mer == "AM") {
						ele_next.find("." + cur_cli + " .mer_tx input").val("PM");
					} else {
						ele_next.find("." + cur_cli + " .mer_tx input").val("AM");
					}
				}
			}

			// handle clicking on the arrow icons
			var cur_next = ele_next.find(".action-next");
			var cur_prev = ele_next.find(".action-prev");
			$(cur_prev).add(cur_next).on("click", function() {
				var cur_ele = $(this);
				if (cur_ele.parent().attr("class") == "time") {
					change_time(cur_ele);
				} else if (cur_ele.parent().attr("class") == "mins") {
					change_mins(cur_ele);
				} else {
					if(settings.show_meridian){
						change_meri(cur_ele);
					}
				}
			});

		});
	};

}(jQuery));
