dojo.provide("dijit.form.NumberTextBox");

dojo.require("dijit.form.ValidationTextBox");
dojo.require("dojo.number");

/*=====
dojo.declare(
	"dijit.form.NumberTextBox.__Constraints",
	[dijit.form.RangeBoundTextBox.__Constraints, dojo.number.__FormatOptions, dojo.number.__ParseOptions], {
	// summary:
	//		Specifies both the rules on valid/invalid values (minimum, maximum,
	//		number of required decimal places), and also formatting options for
	//		displaying the value when the field is not focused.
	// example:
	//		Minimum/maximum:
	//		To specify a field between 0 and 120:
	//	|		{min:0,max:120}
	//		To specify a field that must be an integer:
	//	|		{fractional:false}
	//		To specify a field where 0 to 3 decimal places are allowed on input,
	//		but after the field is blurred the value is displayed with 3 decimal places:
	//	|		{places:'0,3'}
});
=====*/

dojo.declare("dijit.form.NumberTextBoxMixin",
	null,
	{
		// summary:
		//		A mixin for all number textboxes
		// tags:
		//		protected

		// Override ValidationTextBox.regExpGen().... we use a reg-ex generating function rather
		// than a straight regexp to deal with locale (plus formatting options too?)
		regExpGen: dojo.number.regexp,

		/*=====
		// constraints: dijit.form.NumberTextBox.__Constraints
		//		Despite the name, this parameter specifies both constraints on the input
		//		(including minimum/maximum allowed values) as well as
		//		formatting options like places (the number of digits to display after
		//		the decimal point).   See `dijit.form.NumberTextBox.__Constraints` for details.
		constraints: {},
		======*/

		// value: Number
		//		The value of this NumberTextBox as a Javascript Number (i.e., not a String).
		//		If the displayed value is blank, the value is NaN, and if the user types in
		//		an gibberish value (like "hello world"), the value is undefined
		//		(i.e. attr('value') returns undefined).
		//
		//		Symmetrically, attr('value', NaN) will clear the displayed value,
		//		whereas attr('value', undefined) will have no effect.
		value: NaN,

		// editOptions: [protected] Object
		//		Properties to mix into constraints when the value is being edited.
		//		This is here because we edit the number in the format "12345", which is
		//		different than the display value (ex: "12,345")
		editOptions: { pattern: '#.######' },

		/*=====
		_formatter: function(value, options){
			// summary:
			//		_formatter() is called by format().   It's the base routine for formatting a number,
			//		as a string, for example converting 12345 into "12,345".
			// value: Number
			//		The number to be converted into a string.
			// options: dojo.number.__FormatOptions?
			//		Formatting options
			// tags:
			//		protected extension

			return "12345";		// String
		},
		 =====*/
		_formatter: dojo.number.format,

		_setConstraintsAttr: function(/* Object */ constraints){
			var places = typeof constraints.places == "number"? constraints.places : 0;
			if(places){ places++; } // decimal rounding errors take away another digit of precision
			if(typeof constraints.max != "number"){
				constraints.max = 9 * Math.pow(10, 15-places);
			}
			if(typeof constraints.min != "number"){
				constraints.min = -9 * Math.pow(10, 15-places);
			}
			this.inherited(arguments, [ constraints ]);
			if(this.focusNode && this.focusNode.value && !isNaN(this.value)){
				this.set('value', this.value);
			}
		},

		_onFocus: function(){
			if(this.disabled){ return; }
			var val = this.get('value');
			if(typeof val == "number" && !isNaN(val)){
				var formattedValue = this.format(val, this.constraints);
				if(formattedValue !== undefined){
					this.textbox.value = formattedValue;
				}
			}
			this.inherited(arguments);
		},

		format: function(/*Number*/ value, /*dojo.number.__FormatOptions*/ constraints){
			// summary:
			//		Formats the value as a Number, according to constraints.
			// tags:
			//		protected

			var formattedValue = String(value);
			if(typeof value != "number"){ return formattedValue; }
			if(isNaN(value)){ return ""; }
			// check for exponential notation that dojo.number.format chokes on
			if(!("rangeCheck" in this && this.rangeCheck(value, constraints)) && constraints.exponent !== false && /\de[-+]?\d/i.test(formattedValue)){
				return formattedValue;
			}
			if(this.editOptions && this._focused){
				constraints = dojo.mixin({}, constraints, this.editOptions);
			}
			return this._formatter(value, constraints);
		},

		/*=====
		parse: function(value, constraints){
			// summary:
			//		Parses the string value as a Number, according to constraints.
			// value: String
			//		String representing a number
			// constraints: dojo.number.__ParseOptions
			//		Formatting options
			// tags:
			//		protected

			return 123.45;		// Number
		},
		=====*/
		parse: dojo.number.parse,

		_getDisplayedValueAttr: function(){
			var v = this.inherited(arguments);
			return isNaN(v) ? this.textbox.value : v;
		},

		filter: function(/*Number*/ value){
			// summary:
			//		This is called with both the display value (string), and the actual value (a number).
			//		When called with the actual value it does corrections so that '' etc. are represented as NaN.
			//		Otherwise it dispatches to the superclass's filter() method.
			//
			//		See `dijit.form.TextBox.filter` for more details.
			return (value === null || value === '' || value === undefined) ? NaN : this.inherited(arguments); // attr('value', null||''||undefined) should fire onChange(NaN)
		},

		serialize: function(/*Number*/ value, /*Object?*/options){
			// summary:
			//		Convert value (a Number) into a canonical string (ie, how the number literal is written in javascript/java/C/etc.)
			// tags:
			//		protected
			return (typeof value != "number" || isNaN(value)) ? '' : this.inherited(arguments);
		},

		_setValueAttr: function(/*Number*/ value, /*Boolean?*/ priorityChange, /*String?*/formattedValue){
			// summary:
			//		Hook so attr('value', ...) works.
			if(value !== undefined && formattedValue === undefined){
				formattedValue = String(value);
				if(typeof value == "number"){
					if(isNaN(value)){ formattedValue = '' }
					// check for exponential notation that dojo.number.format chokes on
					else if(("rangeCheck" in this && this.rangeCheck(value, this.constraints)) || this.constraints.exponent === false || !/\de[-+]?\d/i.test(formattedValue)){
						formattedValue = undefined; // lets format comnpute a real string value
					}
				}else if(!value){ // 0 processed in if branch above, ''|null|undefined flow thru here
					formattedValue = '';
					value = NaN;
				}else{ // non-numeric values
					value = undefined;
				}
			}
			this.inherited(arguments, [value, priorityChange, formattedValue]);
		},

		_getValueAttr: function(){
			// summary:
			//		Hook so attr('value') works.
			//		Returns Number, NaN for '', or undefined for unparsable text
			var v = this.inherited(arguments); // returns Number for all values accepted by parse() or NaN for all other displayed values

			// If the displayed value of the textbox is gibberish (ex: "hello world"), this.inherited() above
			// returns NaN; this if() branch converts the return value to undefined.
			// Returning undefined prevents user text from being overwritten when doing _setValueAttr(_getValueAttr()).
			// A blank displayed value is still returned as NaN.
			if(isNaN(v) && this.textbox.value !== ''){
				if(this.constraints.exponent !== false && /\de[-+]?\d/i.test(this.textbox.value) && (new RegExp("^"+dojo.number._realNumberRegexp(dojo.mixin({}, this.constraints))+"$").test(this.textbox.value))){	// check for exponential notation that parse() rejected (erroneously?)
					var n = Number(this.textbox.value);
					return isNaN(n) ? undefined : n; // return exponential Number or undefined for random text (may not be possible to do with the above RegExp check)
				}else{
					return undefined; // gibberish
				}
			}else{
				return v; // Number or NaN for ''
			}
		},

		isValid: function(/*Boolean*/ isFocused){
			// Overrides dijit.form.RangeBoundTextBox.isValid to check that the editing-mode value is valid since
			// it may not be formatted according to the regExp vaidation rules
			if(!this._focused || this._isEmpty(this.textbox.value)){
				return this.inherited(arguments);
			}else{
				var v = this.get('value');
				if(!isNaN(v) && this.rangeCheck(v, this.constraints)){
					if(this.constraints.exponent !== false && /\de[-+]?\d/i.test(this.textbox.value)){ // exponential, parse doesn't like it
						return true; // valid exponential number in range
					}else{
						return this.inherited(arguments);
					}
				}else{
					return false;
				}
			}
		}
	}
);

dojo.declare("dijit.form.NumberTextBox",
	[dijit.form.RangeBoundTextBox,dijit.form.NumberTextBoxMixin],
	{
		// summary:
		//		A TextBox for entering numbers, with formatting and range checking
		// description:
		//		NumberTextBox is a textbox for entering and displaying numbers, supporting
		//		the following main features:
		//
		//			1. Enforce minimum/maximum allowed values (as well as enforcing that the user types
		//				a number rather than a random string)
		//			2. NLS support (altering roles of comma and dot as "thousands-separator" and "decimal-point"
		//				depending on locale).
		//			3. Separate modes for editing the value and displaying it, specifically that
		//				the thousands separator character (typically comma) disappears when editing
		//				but reappears after the field is blurred.
		//			4. Formatting and constraints regarding the number of places (digits after the decimal point)
		//				allowed on input, and number of places displayed when blurred (see `constraints` parameter).
	}
);
