/*
 * Fuel UX Spinner
 * https://github.com/ExactTarget/fuelux
 *
 * Copyright (c) 2012 ExactTarget
 * Licensed under the MIT license.
 */

define(['require','jquery'],function(require) {

	var $   = require('jquery');
	var old = $.fn.spinner;

	// SPINNER CONSTRUCTOR AND PROTOTYPE

	var Spinner = function (element, options) {
		this.$element = $(element);
		this.options = $.extend({}, $.fn.spinner.defaults, options);
		this.$input = this.$element.find('.spinner-input');
		this.$element.on('keyup', this.$input, $.proxy(this.change, this));
		this.$element.on('keydown', this.$input, $.proxy(this.keydown, this));

		if (this.options.hold) {
			this.$element.on('mousedown', '.spinner-up', $.proxy(function() { this.startSpin(true); } , this));
			this.$element.on('mouseup', '.spinner-up, .spinner-down', $.proxy(this.stopSpin, this));
			this.$element.on('mouseout', '.spinner-up, .spinner-down', $.proxy(this.stopSpin, this));
			this.$element.on('mousedown', '.spinner-down', $.proxy(function() {this.startSpin(false);} , this));
		} else {
			this.$element.on('click', '.spinner-up', $.proxy(function() { this.step(true); } , this));
			this.$element.on('click', '.spinner-down', $.proxy(function() { this.step(false); }, this));
		}

		this.$element.find('.spinner-up, .spinner-down').attr('tabIndex', -1);

		this.switches = {
			count: 1,
			enabled: true
		};

		if (this.options.speed === 'medium') {
			this.switches.speed = 300;
		} else if (this.options.speed === 'fast') {
			this.switches.speed = 100;
		} else {
			this.switches.speed = 500;
		}

		this.lastValue = null;

		this.render();

		if (this.options.disabled) {
			this.disable();
		}
	};

	Spinner.prototype = {
		constructor: Spinner,

		render: function () {
			var inputValue = this.$input.val();

			if (inputValue) {
				this.value(inputValue);
			} else {
				this.$input.val(this.options.value);
			}

			this.$input.attr('maxlength', (this.options.max + '').split('').length);
		},

		change: function () {
			var newVal = this.$input.val();

			if(newVal/1){
				this.options.value = newVal/1;
			}else{
				newVal = newVal.replace(/[^0-9]/g,'') || '';
				this.$input.val(newVal);
				this.options.value = newVal/1;
			}

			this.triggerChangedEvent();
		},

		stopSpin: function () {
            if(this.switches.timeout!==undefined){
                clearTimeout(this.switches.timeout);
                this.switches.count = 1;
                this.triggerChangedEvent();
            }
		},

		triggerChangedEvent: function () {
			var currentValue = this.value();
			if (currentValue === this.lastValue) return;

			this.lastValue = currentValue;

			// Primary changed event
			this.$element.trigger('changed', currentValue);

			// Undocumented, kept for backward compatibility
			this.$element.trigger('change');
		},

		startSpin: function (type) {

			if (!this.options.disabled) {
				var divisor = this.switches.count;

				if (divisor === 1) {
					this.step(type);
					divisor = 1;
				} else if (divisor < 3){
					divisor = 1.5;
				} else if (divisor < 8){
					divisor = 2.5;
				} else {
					divisor = 4;
				}

				this.switches.timeout = setTimeout($.proxy(function() {this.iterator(type);} ,this),this.switches.speed/divisor);
				this.switches.count++;
			}
		},

		iterator: function (type) {
			this.step(type);
			this.startSpin(type);
		},

		step: function (dir) {
			var curValue = this.options.value;
			var limValue = dir ? this.options.max : this.options.min;
			var digits, multiple;

			if ((dir ? curValue < limValue : curValue > limValue)) {
				var newVal = curValue + (dir ? 1 : -1) * this.options.step;

				if(this.options.step % 1 !== 0){
					digits = (this.options.step + '').split('.')[1].length;
					multiple = Math.pow(10, digits);
					newVal = Math.round(newVal * multiple) / multiple;
				}

				if (dir ? newVal > limValue : newVal < limValue) {
					this.value(limValue);
				} else {
					this.value(newVal);
				}
			} else if (this.options.cycle) {
				var cycleVal = dir ? this.options.min : this.options.max;
				this.value(cycleVal);
			}
		},

		value: function (value) {
			if (!isNaN(parseFloat(value)) && isFinite(value)) {
				value = parseFloat(value);
				this.options.value = value;
				this.$input.val(value);
				return this;
			} else {
				return this.options.value;
			}
		},

		disable: function () {
			this.options.disabled = true;
			this.$input.attr('disabled','');
			this.$element.find('button').addClass('disabled');
		},

		enable: function () {
			this.options.disabled = false;
			this.$input.removeAttr("disabled");
			this.$element.find('button').removeClass('disabled');
		},

		keydown: function(event) {
			var keyCode = event.keyCode;

			if(keyCode===38){
				this.step(true);
			}else if(keyCode===40){
				this.step(false);
			}
		}
	};


	// SPINNER PLUGIN DEFINITION

	$.fn.spinner = function (option) {
		var args = Array.prototype.slice.call( arguments, 1 );
		var methodReturn;

		var $set = this.each(function () {
			var $this   = $( this );
			var data    = $this.data( 'spinner' );
			var options = typeof option === 'object' && option;

			if( !data ) $this.data('spinner', (data = new Spinner( this, options ) ) );
			if( typeof option === 'string' ) methodReturn = data[ option ].apply( data, args );
		});

		return ( methodReturn === undefined ) ? $set : methodReturn;
	};

	$.fn.spinner.defaults = {
		value: 1,
		min: 1,
		max: 999,
		step: 1,
		hold: true,
		speed: 'medium',
		disabled: false
	};

	$.fn.spinner.Constructor = Spinner;

	$.fn.spinner.noConflict = function () {
		$.fn.spinner = old;
		return this;
	};


	// SPINNER DATA-API

	$(function () {
		$('body').on('mousedown.spinner.data-api', '.spinner', function () {
			var $this = $(this);
			if ($this.data('spinner')) return;
			$this.spinner($this.data());
		});
	});
});