// ViewController.swift
let validator = Validator()

override func viewDidLoad() {
    super.viewDidLoad()

    // Validation Rules are evaluated from left to right.
    validator.registerField(fullNameTextField, rules: [RequiredRule(), FullNameRule()])

    // You can pass in error labels with your rules
    // You can pass in custom error messages to regex rules (such as ZipCodeRule and EmailRule)
    validator.registerField(emailTextField, errorLabel: emailErrorLabel, rules: [RequiredRule(), EmailRule(message: "Invalid email")])

    // You can validate against other fields using ConfirmRule
    validator.registerField(emailConfirmTextField, errorLabel: emailConfirmErrorLabel, rules: [ConfirmationRule(confirmField: emailTextField)])

    // You can now pass in regex and length parameters through overloaded contructors
    validator.registerField(phoneNumberTextField, errorLabel: phoneNumberErrorLabel, rules: [RequiredRule(), MinLengthRule(length: 9)])
    validator.registerField(zipcodeTextField, errorLabel: zipcodeErrorLabel, rules: [RequiredRule(), ZipCodeRule(regex = "\\d{5}")])

    // You can unregister a text field if you no longer want to validate it
    validator.unregisterField(fullNameTextField)
}

@IBAction func signupTapped(sender: AnyObject) {
    validator.validate(delegate:self)
}

// ValidationDelegate methods

func validationSuccessful() {
    // submit the form
}

func validationFailed(errors:[UITextField:ValidationError]) {
    // turn the fields to red
    for (field, error) in validator.errors {
        field.layer.borderColor = UIColor.redColor().CGColor
        field.layer.borderWidth = 1.0
        error.errorLabel?.text = error.errorMessage // works if you added labels
        error.errorLabel?.hidden = false
    }
}

// Don't forget to use UITextFieldDelegate
// and delegate yourTextField to self in viewDidLoad()
func textFieldShouldReturn(textField: UITextField) -> Bool {
    validator.validateField(textField){ error in
        if error == nil {
            // Field validation was successful
        } else {
            // Validation error occurred
        }
    }
    return true
}

class SSNVRule: RegexRule {

    static let regex = "^\\d{3}-\\d{2}-\\d{4}$"

    convenience init(message : String = "Not a valid SSN"){
    self.init(regex: SSNVRule.regex, message : message)
    }
}