From 69a23745040dfb10fe755144124a6905faa455ea Mon Sep 17 00:00:00 2001
From: Matt Bruce <matt.bruce@verizon.com>
Date: Thu, 29 Feb 2024 10:34:10 -0600
Subject: [PATCH] First cut at form fiedable change

Signed-off-by: Matt Bruce <matt.bruce@verizon.com>
---
 .../Attributes/LabelAttributeModel.swift      |  2 +-
 .../TextFields/EntryFieldBase.swift           |  4 +-
 .../TextFields/InputField/InputField.swift    |  4 +-
 .../TextFields/TextArea/TextArea.swift        | 43 +++++++++++---
 VDS/Protocols/FormFieldable.swift             | 58 ++++++++++++++++++-
 5 files changed, 97 insertions(+), 14 deletions(-)

diff --git a/VDS/Components/Label/Attributes/LabelAttributeModel.swift b/VDS/Components/Label/Attributes/LabelAttributeModel.swift
index 87708ffb..ac43472f 100644
--- a/VDS/Components/Label/Attributes/LabelAttributeModel.swift
+++ b/VDS/Components/Label/Attributes/LabelAttributeModel.swift
@@ -31,7 +31,7 @@ extension LabelAttributeModel {
     }
     
     public func isValidRange(on attributedString: NSMutableAttributedString) -> Bool {
-        true//range.location + range.length <= attributedString.string.count
+        range.location + range.length <= attributedString.string.count
     }
 }
 
diff --git a/VDS/Components/TextFields/EntryFieldBase.swift b/VDS/Components/TextFields/EntryFieldBase.swift
index e66d31a5..3b738549 100644
--- a/VDS/Components/TextFields/EntryFieldBase.swift
+++ b/VDS/Components/TextFields/EntryFieldBase.swift
@@ -13,7 +13,7 @@ import Combine
 
 /// Base Class used to build out a Input controls.
 @objc(VDSEntryField)
-open class EntryFieldBase: Control, Changeable {
+open class EntryFieldBase: Control, Changeable, FormFieldable {    
     
     //--------------------------------------------------
     // MARK: - Initializers
@@ -196,7 +196,7 @@ open class EntryFieldBase: Control, Changeable {
     
     open var inputId: String? { didSet { setNeedsUpdate() } }
     
-    open var value: AnyHashable? { didSet { setNeedsUpdate() } }
+    open var value: String? { didSet { setNeedsUpdate() } }
     
     open var defaultValue: AnyHashable? { didSet { setNeedsUpdate() } }
     
diff --git a/VDS/Components/TextFields/InputField/InputField.swift b/VDS/Components/TextFields/InputField/InputField.swift
index 589ba28f..7a950a80 100644
--- a/VDS/Components/TextFields/InputField/InputField.swift
+++ b/VDS/Components/TextFields/InputField/InputField.swift
@@ -79,13 +79,13 @@ open class InputField: EntryFieldBase, UITextFieldDelegate {
     open var fieldType: FieldType = .text { didSet { setNeedsUpdate() } }
 
     /// The text of this textField.
-    open override var text: String? {
+    open override var value: String? {
         get { textField.text }
         set {
             textField.text = newValue
         }
     }
-    
+
     var _showError: Bool = false
     /// Whether not to show the error.
     open override var showError: Bool {
diff --git a/VDS/Components/TextFields/TextArea/TextArea.swift b/VDS/Components/TextFields/TextArea/TextArea.swift
index 92f5525a..4b99eeb3 100644
--- a/VDS/Components/TextFields/TextArea/TextArea.swift
+++ b/VDS/Components/TextFields/TextArea/TextArea.swift
@@ -107,14 +107,15 @@ open class TextArea: EntryFieldBase {
         }
     }
     
-    /// The text of this textField.
-    open override var text: String? {
+    open override var value: String? {
         get { textView.text }
         set {
             textView.text = newValue
+            setNeedsUpdate()
+            
         }
     }
-    
+
     /// UITextView shown in the TextArea.
     open var textView = TextView().with {
         $0.translatesAutoresizingMaskIntoConstraints = false
@@ -184,7 +185,7 @@ open class TextArea: EntryFieldBase {
     /// Used to make changes to the View based off a change events or from local properties.
     open override func updateView() {
         super.updateView()
-        
+        countRule.maxLength = maxLength
         textView.isEditable = isEnabled
         textView.isEnabled = isEnabled
         textView.surface = surface
@@ -208,6 +209,9 @@ open class TextArea: EntryFieldBase {
         } else {
             characterCounterLabel.text =  ""
         }
+
+        showError = !validator.validate()
+        errorText = validator.errorMessage
         
         icon.size = .medium
         icon.color = iconColorConfiguration.getColor(self)
@@ -246,12 +250,8 @@ open class TextArea: EntryFieldBase {
         let countStr = (count > maxLength ?? 0) ? ("-" + "\(count-(maxLength ?? 0))") : "\(count)"
         if ((maxLength ?? 0) > 0) {
             if (count > (maxLength ?? 0)) {
-                showError = true
-                errorText = "You have exceeded the character limit."
                 return countStr
             } else {
-                showError = false
-                errorText = ""
                 return ("\(countStr)" + "/" + "\(maxLength ?? 0)")
             }
         } else {
@@ -274,6 +274,33 @@ open class TextArea: EntryFieldBase {
         
         textView.textAttributes = textAttributes
     }
+    
+    //--------------------------------------------------
+    // MARK: - Validation
+    //--------------------------------------------------
+    var countRule = CharacterCountRule()
+    lazy var validator: FieldValidator<TextArea> = {
+        let validator = FieldValidator<TextArea>(field: self, rules: [.init(countRule)])
+        return validator
+    }()
+    
+    class CharacterCountRule: Rule {
+        var maxLength: Int?
+        var errorMessage: String = "You have exceeded the character limit."
+        
+        func isValid(value: String?) -> Bool {
+            guard let text = value else { return true }
+
+            if ((maxLength ?? 0) > 0) {
+                if (text.count > (maxLength ?? 0)) {
+                    return false
+                } else {
+                    return true
+                }
+            }
+            return true
+        }
+    }
 }
 
 extension TextArea: UITextViewDelegate {
diff --git a/VDS/Protocols/FormFieldable.swift b/VDS/Protocols/FormFieldable.swift
index fe015120..294f581c 100644
--- a/VDS/Protocols/FormFieldable.swift
+++ b/VDS/Protocols/FormFieldable.swift
@@ -9,10 +9,66 @@ import Foundation
 
 /// Protocol used for a FormField object.
 public protocol FormFieldable {
+    associatedtype ValueType = AnyHashable
     
     /// Unique Id for the Form Field object within a Form.
     var inputId: String? { get set }
     
     /// Value for the Form Field.
-    var value: AnyHashable? { get set }
+    var value: ValueType? { get set }
+}
+
+public struct AnyRule<ValueType> {
+    private let _isValid: (ValueType?) -> Bool
+    public let errorMessage: String
+
+    init<R: Rule>(_ rule: R) where R.ValueType == ValueType {
+        self._isValid = rule.isValid
+        self.errorMessage = rule.errorMessage
+    }
+
+    public func isValid(value: Any?) -> Bool {
+        guard let typedValue = value as? ValueType? else {
+            return false
+        }
+        return _isValid(typedValue)
+    }
+}
+
+public protocol Rule<ValueType> {
+    associatedtype ValueType
+    func isValid(value: ValueType?) -> Bool
+    var errorMessage: String { get }
+}
+
+public class FieldValidator<Field:FormFieldable>{
+    public var field: Field
+    public var rules: [AnyRule<Field.ValueType>]?
+    public var errorMessages = [String]()
+    
+    public init(field: Field, rules: [AnyRule<Field.ValueType>]? = nil) {
+        self.field = field
+        self.rules = rules
+    }
+    
+    public var errorMessage: String? {
+        errorMessages.joined(separator: "\r")
+    }
+    
+    public func validate() -> Bool{
+        errorMessages.removeAll()
+        
+        guard let rules else {
+            return true
+        }
+        
+        for rule in rules {
+            if !rule.isValid(value: field.value) {
+                errorMessages.append(rule.errorMessage)
+                return false
+            }
+        }
+        return true
+    }
+
 }