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AuthService.swift

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+//
+//  AuthService.swift
+//  Industrial_APP
+//
+//  Created by User on 2024/1/3.
+//
+
+import Foundation
+import Firebase
+
+
+
+class AuthService{
+
+    @Published var userSession: FirebaseAuth.User?
+
+    static let shared = AuthService()
+    init(){
+        self.userSession = Auth.auth().currentUser
+    }
+    @MainActor
+    func login(withEmail email: String, password: String) async throws{
+        do {
+            let result = try await Auth.auth().signIn(withEmail: email, password: password)
+            self.userSession = result.user
+        } catch {
+            print("DEBUG: Failed to login user with error \(error.localizedDescription)")
+        }
+
+    }
+
+
+    func signout(){
+        try? Auth.auth().signOut()
+        self.userSession = nil
+    }
+}

ContentView.swift

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+//
+//  ContentView.swift
+//  Industrial_APP
+//
+//  Created by User on 2023/12/29.
+//
+
+import SwiftUI
+
+struct ContentView: View {
+    @StateObject var viewModel = ContentViewModel()
+
+    var body: some View {
+        Group{
+            if viewModel.userSession == nil {
+                Login()
+            } else {
+                MainTabView()
+            }
+        }
+    }
+}
+
+#Preview {
+    ContentView()
+}

ContentViewModel.swift

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+//
+//  ContentView.swift
+//  Industrial_APP
+//
+//  Created by User on 2023/12/29.
+//
+
+import Foundation
+import Firebase
+import Combine
+
+@MainActor
+class ContentViewModel: ObservableObject{
+
+    private let service = AuthService.shared
+    private var cancellables = Set<AnyCancellable>()
+
+    @Published var userSession : FirebaseAuth.User?
+    init(){
+        setupSubscribers()
+    }
+    func setupSubscribers(){
+        service.$userSession.sink{[weak self] userSession in
+            self?.userSession = userSession
+        }
+        .store(in: &cancellables)
+    }
+}

Cost.swift

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+import SwiftUI
+
+struct Cost: View {
+    @State private var directLabor = DirectLabor()
+    @State private var rawMaterial = RawMaterial()
+    @State private var totalCost = 0.0
+
+    var body: some View {
+        NavigationView {
+            VStack {
+                Form {
+                    Section(header: Text("Direct Labor")) {
+                        LaborTextField(title: "Radial Cut", value: $directLabor.radialCut)
+                        LaborTextField(title: "Planing", value: $directLabor.planing)
+                        LaborTextField(title: "Treatment", value: $directLabor.treatment)
+                        LaborTextField(title: "Four Sides Planing", value: $directLabor.fourSidesPlaning)
+                        LaborTextField(title: "Carving Glue", value: $directLabor.carvingGlue)
+                        LaborTextField(title: "Sanding", value: $directLabor.sanding)
+                    }
+
+                    Section(header: Text("Raw Material")) {
+                        MaterialTextField(title: "Bamboo", value: $rawMaterial.bamboo)
+                        MaterialTextField(title: "Caustic Soda", value: $rawMaterial.causticSoda)
+                        MaterialTextField(title: "Borax", value: $rawMaterial.borax)
+                        MaterialTextField(title: "Boric Acid", value: $rawMaterial.boricAcid)
+                        MaterialTextField(title: "Gas Consumption", value: $rawMaterial.gasConsumption)
+                        MaterialTextField(title: "Hydrogen Peroxide", value: $rawMaterial.hydrogenPeroxide)
+                        MaterialTextField(title: "Sodium Salt", value: $rawMaterial.sodiumSalt)
+                        MaterialTextField(title: "QR 500", value: $rawMaterial.qr500)
+                        MaterialTextField(title: "QR 1000", value: $rawMaterial.qr1000)
+                        MaterialTextField(title: "Glue", value: $rawMaterial.glue)
+                        MaterialTextField(title: "Oil", value: $rawMaterial.oil)
+                        MaterialTextField(title: "Sandpaper 36", value: $rawMaterial.sandpaper36)
+                        MaterialTextField(title: "Sandpaper 40", value: $rawMaterial.sandpaper40)
+                    }
+                }
+
+                Button(action: calculateTotalCost) {
+                    Text("Calculate Total Cost")
+                        .foregroundColor(.white)
+                        .padding()
+                        .frame(maxWidth: .infinity)
+                        .background(Color.blue)
+                        .cornerRadius(10)
+                }
+                .padding()
+
+                Text("Total Cost: $\(totalCost, specifier: "%.2f")")
+                    .padding()
+            }
+            .navigationBarTitle("Cost Calculator", displayMode: .inline)
+        }
+    }
+
+    func calculateTotalCost() {
+        let directLaborCost = calculateDirectLaborCost()
+        let rawMaterialCost = calculateRawMaterialCost()
+        totalCost = directLaborCost + rawMaterialCost
+    }
+
+    func calculateDirectLaborCost() -> Double {
+        let radialCutCost = calculateCost(for: directLabor.radialCut, with: 26.98)
+        let planingCost = calculateCost(for: directLabor.planing, with: 17.58)
+        let treatmentCost = calculateCost(for: directLabor.treatment, with: 33.60)
+        let fourSidesPlaningCost = calculateCost(for: directLabor.fourSidesPlaning, with: 23.17)
+        let carvingGlueCost = calculateCost(for: directLabor.carvingGlue, with: 42.69)
+        let sandingCost = calculateCost(for: directLabor.sanding, with: 0.0)
+        return radialCutCost + planingCost + treatmentCost + fourSidesPlaningCost + carvingGlueCost + sandingCost
+    }
+
+    func calculateRawMaterialCost() -> Double {
+        let bambooCost = calculateCost(for: rawMaterial.bamboo, with: 15.0)
+        let causticSodaCost = calculateCost(for: rawMaterial.causticSoda, with: 16.0)
+        let boraxCost = calculateCost(for: rawMaterial.borax, with: 24.0)
+        let boricAcidCost = calculateCost(for: rawMaterial.boricAcid, with: 24.0)
+        let gasConsumptionCost = calculateCost(for: rawMaterial.gasConsumption, with: 24.0)
+        let hydrogenPeroxideCost = calculateCost(for: rawMaterial.hydrogenPeroxide, with: 100.0)
+        let sodiumSaltCost = calculateCost(for: rawMaterial.sodiumSalt, with: 12.5)
+        let qr500Cost = calculateCost(for: rawMaterial.qr500, with: 145.0)
+        let qr1000Cost = calculateCost(for: rawMaterial.qr1000, with: 145.0)
+        let glueCost = calculateCost(for: rawMaterial.glue, with: 35.8)
+        let oilCost = calculateCost(for: rawMaterial.oil, with: 78.2)
+        let sandpaper36Cost = calculateCost(for: rawMaterial.sandpaper36, with: 0.0)
+        let sandpaper40Cost = calculateCost(for: rawMaterial.sandpaper40, with: 0.0)
+        return bambooCost + causticSodaCost + boraxCost + boricAcidCost + gasConsumptionCost + hydrogenPeroxideCost + sodiumSaltCost + qr500Cost + qr1000Cost + glueCost + oilCost + sandpaper36Cost + sandpaper40Cost
+    }
+
+    func calculateCost(for value: String, with unitCost: Double) -> Double {
+        let cost = Double(value) ?? 0
+        return cost * unitCost
+    }
+}
+
+struct LaborTextField: View {
+    var title: String
+    @Binding var value: String
+
+    var body: some View {
+        TextField(title, text: $value)
+            .keyboardType(.decimalPad)
+    }
+}
+
+struct MaterialTextField: View {
+    var title: String
+    @Binding var value: String
+
+    var body: some View {
+        TextField(title, text: $value)
+            .keyboardType(.decimalPad)
+    }
+}
+
+struct DirectLabor {
+    var radialCut = ""
+    var planing = ""
+    var treatment = ""
+    var fourSidesPlaning = ""
+    var carvingGlue = ""
+    var sanding = ""
+}
+
+struct RawMaterial {
+    var bamboo = ""
+    var causticSoda = ""
+    var borax = ""
+    var boricAcid = ""
+    var gasConsumption = ""
+    var hydrogenPeroxide = ""
+    var sodiumSalt = ""
+    var qr500 = ""
+    var qr1000 = ""
+    var glue = ""
+    var oil = ""
+    var sandpaper36 = ""
+    var sandpaper40 = ""
+}
+
+struct Cost_Previews: PreviewProvider {
+    static var previews: some View {
+        Cost()
+    }
+}

GoogleService-Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>API_KEY</key>
+	<string>AIzaSyCTJBH3Lc8z9LqoWM3F26S4gL3fugUOVys</string>
+	<key>GCM_SENDER_ID</key>
+	<string>453251036409</string>
+	<key>PLIST_VERSION</key>
+	<string>1</string>
+	<key>BUNDLE_ID</key>
+	<string>Shawn.Industrial-APP</string>
+	<key>PROJECT_ID</key>
+	<string>bambuproject-22fb4</string>
+	<key>STORAGE_BUCKET</key>
+	<string>bambuproject-22fb4.appspot.com</string>
+	<key>IS_ADS_ENABLED</key>
+	<false></false>
+	<key>IS_ANALYTICS_ENABLED</key>
+	<false></false>
+	<key>IS_APPINVITE_ENABLED</key>
+	<true></true>
+	<key>IS_GCM_ENABLED</key>
+	<true></true>
+	<key>IS_SIGNIN_ENABLED</key>
+	<true></true>
+	<key>GOOGLE_APP_ID</key>
+	<string>1:453251036409:ios:607fa8fb90a11b34d69e28</string>
+</dict>
+</plist>