SideStore/AltStore/Views/Settings/ConnectAppleIDView.swift

//
//  ConnectAppleIDView.swift
//  SideStore
//
//  Created by Fabian Thies on 29.11.22.
//  Copyright © 2022 SideStore. All rights reserved.
//

import SwiftUI
import AltSign

struct ConnectAppleIDView: View {
    typealias AuthenticationHandler = (String, String, @escaping (Result<(ALTAccount, ALTAppleAPISession), Error>) -> Void) -> Void
    typealias CompletionHandler = ((ALTAccount, ALTAppleAPISession, String)?) -> Void
    
    @Environment(\.dismiss)
    private var dismiss
    
    var authenticationHandler: AuthenticationHandler?
    var completionHandler: CompletionHandler?
    
    @State var email: String = ""
    @State var password: String = ""
    @State var isLoading: Bool = false
    
    var isFormValid: Bool {
        !email.isEmpty && !password.isEmpty
    }
    
    var body: some View {
        ScrollView {
            VStack(alignment: .leading, spacing: 32) {
                Text("Sign in with your Apple ID to get started.")
                
                VStack(spacing: 16) {
                    RoundedTextField(title: "Apple ID", placeholder: "user@sidestore.io", text: $email)
                    
                    RoundedTextField(title: "Password", placeholder: "••••••", text: $password, isSecure: true)
                }
                
                SwiftUI.Button(action: signIn) {
                    Text("Sign in")
                        .bold()
                }
                .buttonStyle(FilledButtonStyle(isLoading: isLoading))
                .disabled(!isFormValid)
                
                Spacer()
                
                VStack(alignment: .leading) {
                    Text("Why do we need this?")
                        .bold()
                    
                    Text("Your Apple ID is used to configure apps so they can be installed on this device. Your credentials will be stored securely in this device's Keychain and sent only to Apple for authentication.")
                }
                .padding()
                .background(
                    RoundedRectangle(cornerRadius: 12)
                        .foregroundColor(Color(.secondarySystemBackground))
                )
            }
            .padding(.horizontal)
        }
        .frame(maxWidth: .infinity)
        .navigationTitle("Connect your Apple ID")
        .toolbar {
            ToolbarItem(placement: .navigationBarTrailing) {
                SwiftUI.Button(action: self.cancel) {
                    Text("Cancel")
                }
            }
        }
    }
    
    
    func signIn() {
        self.isLoading = true
        self.authenticationHandler?(email, password) { (result) in
            defer {
                self.isLoading = false
            }
            
            switch result
            {
            case .failure(ALTAppleAPIError.requiresTwoFactorAuthentication):
                // Ignore
                break
                
            case .failure(let error as NSError):
                let error = error.withLocalizedFailure(NSLocalizedString("Failed to Log In", comment: ""))
                print(error)
                
            case .success((let account, let session)):
                self.completionHandler?((account, session, password))
            }
        }
    }
    
    func cancel() {
        self.completionHandler?(nil)
//        self.dismiss()
    }
}

struct ConnectAppleIDView_Previews: PreviewProvider {
    static var previews: some View {
        ConnectAppleIDView()
    }
}