define(["dojo/_base/kernel", "dojo/_base/lang", "./_base"
], function(kernel, lang, validate){
	kernel.experimental("dojox.validate.check");

/**
	FIXME: How much does this overlap with dojox.form.Manager and friends?

	Procedural API Description

		The main aim is to make input validation expressible in a simple format.
		You define profiles which declare the required and optional fields and any constraints they might have.
		The results are provided as an object that makes it easy to handle missing and invalid input.

	Usage

		var results = dojox.validate.check(form, profile);

	Profile Object

		var profile = {
			// filters change the field value and are applied before validation.
			trim: ["tx1", "tx2"],
			uppercase: ["tx9"],
			lowercase: ["tx5", "tx6", "tx7"],
			ucfirst: ["tx10"],
			digit: ["tx11"],

			// required input fields that are blank will be reported missing.
			// required radio button groups and drop-down lists with no selection will be reported missing.
			// checkbox groups and selectboxes can be required to have more than one value selected.
			// List required fields by name and use this notation to require more than one value: {checkboxgroup: 2}, {selectboxname: 3}.
			required: ["tx7", "tx8", "pw1", "ta1", "rb1", "rb2", "cb3", "s1", {"doubledip":2}, {"tripledip":3}],

			// dependant/conditional fields are required if the target field is present and not blank.
			// At present only textbox, password, and textarea fields are supported.
			dependencies:	{
				cc_exp: "cc_no",
				cc_type: "cc_no"
			},

			// Fields can be validated using any boolean valued function.
			// Custom validation fields can also return custom error messages. 
			// Function name may also be written as a string (useful when passing form profile via JSON) 
			// Use arrays to specify parameters in addition to the field value.
			constraints: {
				field_name1: myValidationFunction,
				field_name2: [myValidationFunction, additional parameters],
				field_name3: "myValidationFunction",
				field_name4: ["myValidationFunction", {"message" : "Value must be an integer. Please try again.", additional parameters}]
				field_name5: dojox.validate.isInteger,
				field_name6: [dojox.validate.isValidDate, "YYYY.MM.DD"],
				field_name7: [dojox.validate.isEmailAddress, false, true]			},

			// Confirm is a sort of conditional validation.
			// It associates each field in its property list with another field whose value should be equal.
			// If the values are not equal, the field in the property list is reported as Invalid. Unless the target field is blank.
			confirm: {
				email_confirm: "email",
				pw2: "pw1"
			}
		};

	Results Object

		isSuccessful(): Returns true if there were no invalid or missing fields, else it returns false.
		hasMissing():  Returns true if the results contain any missing fields.
		getMissing():  Returns a list of required fields that have values missing.
		isMissing(field):  Returns true if the field is required and the value is missing.
		hasInvalid():  Returns true if the results contain fields with invalid data.
		getInvalid():  Returns a list of fields that have invalid values and custom error messages (optional).
		isInvalid(field):  Returns true if the field has an invalid value.

*/

validate.check = function(/*HTMLFormElement*/form, /*Object*/profile){
	// summary:
	//		validates user input of an HTML form based on input profile
	// description:
	//		returns an object that contains several methods summarizing the results of the validation
	// form:
	//		form to be validated
	// profile:
	//		specifies how the form fields are to be validated
	//		{trim:Array, uppercase:Array, lowercase:Array, ucfirst:Array, digit:Array,
	//		required:Array, dependencies:Object, constraints:Object, confirm:Object}

	// Essentially private properties of results object
	var missing = [];
	var invalid = [];

	// results object summarizes the validation
	var results = {
		isSuccessful: function() {return ( !this.hasInvalid() && !this.hasMissing() );},
		hasMissing: function() {return ( missing.length > 0 );},
		getMissing: function() {return missing;},
		isMissing: function(elemname) {
			for(var i = 0; i < missing.length; i++){
				if(elemname == missing[i]){ return true; }
			}
			return false;
		},
		hasInvalid: function() {return ( invalid.length > 0 );},
		getInvalid: function() {return invalid;},
		isInvalid: function(elemname){
			for(var i = 0; i < invalid.length; i++){
				if(elemname == invalid[i]){ return true; }
			}
			return false;
		}
	};

	var _undef = function(name,object){
                return (typeof object[name] == "undefined");
        };

	// Filters are applied before fields are validated.
	// Trim removes white space at the front and end of the fields.
	if(profile.trim instanceof Array){
		for(var i = 0; i < profile.trim.length; i++){
			var elem = form[profile.trim[i]];
			if(_undef("type", elem) || elem.type != "text" && elem.type != "textarea" && elem.type != "password"){ continue; }
			elem.value = elem.value.replace(/(^\s*|\s*$)/g, "");
		}
	}
	// Convert to uppercase
	if(profile.uppercase instanceof Array){
		for(var i = 0; i < profile.uppercase.length; i++){
			var elem = form[profile.uppercase[i]];
			if(_undef("type", elem) || elem.type != "text" && elem.type != "textarea" && elem.type != "password"){ continue; }
			elem.value = elem.value.toUpperCase();
		}
	}
	// Convert to lowercase
	if(profile.lowercase instanceof Array){
		for (var i = 0; i < profile.lowercase.length; i++){
			var elem = form[profile.lowercase[i]];
			if(_undef("type", elem) || elem.type != "text" && elem.type != "textarea" && elem.type != "password"){ continue; }
			elem.value = elem.value.toLowerCase();
		}
	}
	// Uppercase first letter
	if(profile.ucfirst instanceof Array){
		for(var i = 0; i < profile.ucfirst.length; i++){
			var elem = form[profile.ucfirst[i]];
			if(_undef("type", elem) || elem.type != "text" && elem.type != "textarea" && elem.type != "password"){ continue; }
			elem.value = elem.value.replace(/\b\w+\b/g, function(word) { return word.substring(0,1).toUpperCase() + word.substring(1).toLowerCase(); });
		}
	}
	// Remove non digits characters from the input.
	if(profile.digit instanceof Array){
		for(var i = 0; i < profile.digit.length; i++){
			var elem = form[profile.digit[i]];
			if(_undef("type", elem) || elem.type != "text" && elem.type != "textarea" && elem.type != "password"){ continue; }
			elem.value = elem.value.replace(/\D/g, "");
		}
	}

	// See if required input fields have values missing.
	if(profile.required instanceof Array){
		for(var i = 0; i < profile.required.length; i++){
			if(!lang.isString(profile.required[i])){ continue; }
			var elem = form[profile.required[i]];
			// Are textbox, textarea, or password fields blank.
			if(!_undef("type", elem)
				&& (elem.type == "text" || elem.type == "textarea" || elem.type == "password" || elem.type == "file")
				&& /^\s*$/.test(elem.value)){
				missing[missing.length] = elem.name;
			}
			// Does drop-down box have option selected.
			else if(!_undef("type", elem) && (elem.type == "select-one" || elem.type == "select-multiple")
						&& (elem.selectedIndex == -1
						|| /^\s*$/.test(elem.options[elem.selectedIndex].value))){
				missing[missing.length] = elem.name;
			}
			// Does radio button group (or check box group) have option checked.
			else if(elem instanceof Array){
				var checked = false;
				for(var j = 0; j < elem.length; j++){
					if (elem[j].checked) { checked = true; }
				}
				if(!checked){
					missing[missing.length] = elem[0].name;
				}
			}
		}
	}

	// See if checkbox groups and select boxes have x number of required values.
	if(profile.required instanceof Array){
		for (var i = 0; i < profile.required.length; i++){
			if(!lang.isObject(profile.required[i])){ continue; }
			var elem, numRequired;
			for(var name in profile.required[i]){
				elem = form[name];
				numRequired = profile.required[i][name];
			}
			// case 1: elem is a check box group
			if(elem instanceof Array){
				var checked = 0;
				for(var j = 0; j < elem.length; j++){
					if(elem[j].checked){ checked++; }
				}
				if(checked < numRequired){
					missing[missing.length] = elem[0].name;
				}
			}
			// case 2: elem is a select box
			else if(!_undef("type", elem) && elem.type == "select-multiple" ){
				var selected = 0;
				for(var j = 0; j < elem.options.length; j++){
					if (elem.options[j].selected && !/^\s*$/.test(elem.options[j].value)) { selected++; }
				}
				if(selected < numRequired){
					missing[missing.length] = elem.name;
				}
			}
		}
	}

	// Dependent fields are required when the target field is present (not blank).
	// Todo: Support dependent and target fields that are radio button groups, or select drop-down lists.
	// Todo: Make the dependency based on a specific value of the target field.
	// Todo: allow dependent fields to have several required values, like {checkboxgroup: 3}.
	if(lang.isObject(profile.dependencies)){
		// properties of dependencies object are the names of dependent fields to be checked
		for(name in profile.dependencies){
			var elem = form[name];	// the dependent element
			if(_undef("type", elem)){continue;}
			if(elem.type != "text" && elem.type != "textarea" && elem.type != "password"){ continue; } // limited support
			if(/\S+/.test(elem.value)){ continue; }	// has a value already
			if(results.isMissing(elem.name)){ continue; }	// already listed as missing
			var target = form[profile.dependencies[name]];
			if(target.type != "text" && target.type != "textarea" && target.type != "password"){ continue; }	// limited support
			if(/^\s*$/.test(target.value)){ continue; }	// skip if blank
			missing[missing.length] = elem.name;	// ok the dependent field is missing
		}
	}

	// Find invalid input fields.
	if(lang.isObject(profile.constraints)){
		// constraint properties are the names of fields to be validated
		for(name in profile.constraints){
			var elem = form[name];
			if(!elem) {continue;}

			// skip if blank - its optional unless required, in which case it
			// is already listed as missing.
			if(!_undef("tagName",elem)
				&& (elem.tagName.toLowerCase().indexOf("input") >= 0
					|| elem.tagName.toLowerCase().indexOf("textarea") >= 0)
				&& /^\s*$/.test(elem.value)){
				continue;
			}

			// constraintResponse should have two properties: isValid(bool), message(string)
			var constraintResponse;
			// case 1: constraint value is validation function
			if(lang.isFunction(profile.constraints[name])){
				constraintResponse = profile.constraints[name](elem.value);
			}else if(lang.isFunction(lang.getObject(name, false, profile.constraints))){
				// case 2: constraint value is validation function name as string
				constraintResponse = lang.getObject(name, false, profile.constraints)(elem.value);
			}else if(lang.isArray(profile.constraints[name])){

				// handle nested arrays for multiple constraints
				if(lang.isArray(profile.constraints[name][0])){
					for(var i=0; i<profile.constraints[name].length; i++){
						constraintResponse = validate.evaluateConstraint(profile, profile.constraints[name][i], name, elem);
						if(!constraintResponse.isValid){ break; }
					}
				}else{
					// case 3: constraint value is array, first elem is function,
					// tail is parameters
					if(lang.isFunction(lang.getObject(name, false, profile.constraints))){
							constraintResponse = validate.evaluateConstraint(profile, profile.constraints[profile.constraints[name]], name, elem);
					}else{
						constraintResponse = validate.evaluateConstraint(profile, profile.constraints[name], name, elem);
					}
				}
			}

			// if constraintResponse is false (backwards compatibility with last version) or if property isValid is false, return the invalid field name and/or the constraintResponse message
			if(!constraintResponse){
				invalid[invalid.length] = elem.name;
			}else if(typeof constraintResponse !== "boolean" && !constraintResponse.isValid){
				invalid[invalid.length] = { field : elem.name, message : constraintResponse.message };
			}
		}
	}

	// Find unequal confirm fields and report them as Invalid.
	if(lang.isObject(profile.confirm)){
		for(name in profile.confirm){
			var elem = form[name];	// the confirm element
			var target = form[profile.confirm[name]];
			if (_undef("type", elem) || _undef("type", target) || (elem.type != "text" && elem.type != "textarea" && elem.type != "password")
				||(target.type != elem.type)
				||(target.value == elem.value)	// it's valid
				||(results.isInvalid(elem.name))// already listed as invalid
				||(/^\s*$/.test(target.value)))	// skip if blank - only confirm if target has a value
			{
				continue;
			}
			invalid[invalid.length] = elem.name;
		}
	}
	return results; // Object
};

//TODO: evaluateConstraint doesn't use profile or fieldName args?
validate.evaluateConstraint=function(profile, /*Array*/constraint, fieldName, elem){
	// summary:
	//		Evaluates dojo.validate.check() constraints that are specified as array
	//		arguments
	// description:
	//		The arrays are expected to be in the format of:
	//	|    constraints:{
	//	|            fieldName: [functionToCall, param1, param2, etc.],
	//	|            fieldName: [[functionToCallFirst, param1],[functionToCallSecond,param2]]
	//	|    }
	//
	//		This function evaluates a single array function in the format of:
	//		[functionName, argument1, argument2, etc]
	//
	//		The function will be parsed out and evaluated against the incoming parameters.
	// profile:
	//		The dojo.validate.check() profile that this evaluation is against.
	// constraint:
	//		The single [] array of function and arguments for the function.
	// fieldName:
	//		The form dom name of the field being validated.
	// elem:
	//		The form element field.

 	var isValidSomething = constraint[0];
	var params = constraint.slice(1);
	params.unshift(elem.value);
	if(typeof isValidSomething != "undefined" && typeof isValidSomething != "string"){
		return isValidSomething.apply(null, params);
	}else if(typeof isValidSomething != "undefined" && typeof isValidSomething == "string"){
		if(lang.isFunction(lang.getObject(isValidSomething))){
			return lang.getObject(isValidSomething).apply(null, params);
		}
	}
	return false; // Boolean
};

return validate.check;
});
