From 865df2334c8ab07518b3acf561c830c2e93fa09f Mon Sep 17 00:00:00 2001
From: Melt <seokwoo2000@naver.com>
Date: Fri, 28 Apr 2023 19:53:11 +0900
Subject: [PATCH] =?UTF-8?q?[Conflict]=20=ED=8C=8C=EC=9D=BC=EB=B3=B5?=
 =?UTF-8?q?=EA=B5=AC2=20=EB=B3=B5=EB=B6=99=ED=95=98=EA=B8=B0=20#8?=
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---
 .../AuthScene/ViewModel/SignInViewModel.swift | 84 +++++++++++++++++++
 .../Utility/DesignPattern/Observable.swift    | 34 ++++++++
 .../SOPTving/Utility/Extension/String+.swift  | 16 ++++
 3 files changed, 134 insertions(+)

diff --git a/SOPTving/SOPTving/Presentation/AuthScene/ViewModel/SignInViewModel.swift b/SOPTving/SOPTving/Presentation/AuthScene/ViewModel/SignInViewModel.swift
index 3396656..846bffa 100644
--- a/SOPTving/SOPTving/Presentation/AuthScene/ViewModel/SignInViewModel.swift
+++ b/SOPTving/SOPTving/Presentation/AuthScene/ViewModel/SignInViewModel.swift
@@ -6,3 +6,87 @@
 //
 
 import Foundation
+
+enum AuthError: Error {
+    case invalidEmail
+    case invlidPassword
+    case invalidUser
+    
+    var message: String {
+        switch self {
+
+        case .invalidEmail:
+            return "이메일형식을 잘못 입력하셨습니다."
+        case .invlidPassword:
+            return "비밀번호를 8자 이상 입력해주세요."
+        case .invalidUser:
+            return "존재하지 않는 회원입니다."
+        }
+    }
+}
+
+protocol SignInViewModelInput {
+    func emailTextFieldDidChangeEvent(_ text: String)
+    func passwordTextFieldDidChangeEvent(_ text: String)
+    func signInButtonDidTapEvent()
+}
+
+protocol SignInViewModelOutput {
+    var ableToSignIn: Observable<Bool> { get }
+    var isSuccessLogin: Observable<Result<Bool,AuthError>> { get }
+}
+
+protocol SignInViewModel: SignInViewModelInput, SignInViewModelOutput { }
+
+final class DefaultSignInViewModel: SignInViewModel {
+    
+    private var email: String
+    private var password: String
+    
+    //MARK: - Output
+    
+    var ableToSignIn: Observable<Bool> = Observable(false)
+    var isSuccessLogin: Observable<Result<Bool,AuthError>> = Observable(.failure(.invalidEmail))
+    
+    //MARK: - Init
+    
+    init(email: String, password: String) {
+        self.email = email
+        self.password = password
+    }
+    
+}
+
+extension DefaultSignInViewModel {
+    
+    func emailTextFieldDidChangeEvent(_ text: String) {
+        self.email = text
+        self.ableToSignIn.value = email.hasText && password.hasText
+    }
+    
+    func passwordTextFieldDidChangeEvent(_ text: String) {
+        self.password = text
+        self.ableToSignIn.value = email.hasText && password.hasText
+    }
+    
+    func signInButtonDidTapEvent() {
+        let isValidEmail = email.isEmailFormat
+        let isValidPassword = password.isMoreThan(8)
+        let isExistedUser = true //    나중에 서버 통신 후 해당 값 isExistedUser에 대입. 임시적으로 true
+        
+        guard isValidEmail else {
+            isSuccessLogin.value = .failure(.invalidEmail)
+            return
+        }
+        guard isValidPassword else {
+            isSuccessLogin.value = .failure(.invlidPassword)
+            return
+        }
+        guard isExistedUser else {
+            isSuccessLogin.value = .failure(.invalidUser)
+            return
+        }
+        
+        isSuccessLogin.value = .success(true)
+    }
+}
diff --git a/SOPTving/SOPTving/Utility/DesignPattern/Observable.swift b/SOPTving/SOPTving/Utility/DesignPattern/Observable.swift
index 33bee14..3df3c52 100644
--- a/SOPTving/SOPTving/Utility/DesignPattern/Observable.swift
+++ b/SOPTving/SOPTving/Utility/DesignPattern/Observable.swift
@@ -6,3 +6,37 @@
 //
 
 import Foundation
+
+final class Observable<T> {
+    
+    struct Observer<T> {
+        weak var observer: AnyObject?
+        let block: (T) -> Void
+    }
+    
+    private var observers = [Observer<T>]()
+    
+    var value: T {
+        didSet { notifyObservers() }
+    }
+    
+    init(_ value: T) {
+        self.value = value
+    }
+    
+    func observe(on observer: AnyObject, observerBlock: @escaping (T) -> Void) {
+        observers.append(Observer(observer: observer, block: observerBlock))
+        observerBlock(self.value)
+    }
+    
+    func remove(observer: AnyObject) {
+        observers = observers.filter { $0.observer !== observer }
+    }
+    
+    private func notifyObservers() {
+        for observer in observers {
+            observer.block(self.value)
+        }
+    }
+}
+
diff --git a/SOPTving/SOPTving/Utility/Extension/String+.swift b/SOPTving/SOPTving/Utility/Extension/String+.swift
index d510d3b..1555c76 100644
--- a/SOPTving/SOPTving/Utility/Extension/String+.swift
+++ b/SOPTving/SOPTving/Utility/Extension/String+.swift
@@ -6,3 +6,19 @@
 //
 
 import Foundation
+
+extension String {
+    
+    var isEmailFormat: Bool {
+        let emailRegex = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,6}"
+        return NSPredicate(format: "SELF MATCHES %@", emailRegex).evaluate(with: self)
+    }
+    
+    var hasText: Bool {
+        return !isEmpty
+    }
+    
+    func isMoreThan(_ length: Int) -> Bool {
+        return self.count > length
+    }
+}