vChewing-macOS/Installer/MainView.swift

// (c) 2021 and onwards The vChewing Project (MIT-NTL License).
// ====================
// This code is released under the MIT license (SPDX-License-Identifier: MIT)
// ... with NTL restriction stating that:
// No trademark license is granted to use the trade names, trademarks, service
// marks, or product names of Contributor, except as required to fulfill notice
// requirements defined in MIT License.

import AppKit
import SwiftUI

public struct MainView: View {
  static let strCopyrightLabel = Bundle.main.localizedInfoDictionary?["NSHumanReadableCopyright"] as? String ?? "BAD_COPYRIGHT_LABEL"

  @State var pendingSheetPresenting = false
  @State var isShowingAlertForFailedInstallation = false
  @State var isShowingAlertForMissingPostInstall = false
  @State var isShowingPostInstallNotification = false
  @State var currentAlertContent: AlertType = .nothing
  @State var isCancelButtonEnabled = true
  @State var isAgreeButtonEnabled = true
  @State var isPreviousVersionNotFullyDeactivated = false
  @State var isTranslocationFinished: Bool?
  @State var isUpgrading: Bool = false

  var translocationRemovalStartTime: Date?

  @State var timeRemaining = 60
  let timer = Timer.publish(every: 1, on: .main, in: .common).autoconnect()

  public init() {
    if FileManager.default.fileExists(atPath: kTargetPartialPath) {
      let currentBundle = Bundle(path: kTargetPartialPath)
      let shortVersion = currentBundle?.infoDictionary?["CFBundleShortVersionString"] as? String
      let currentVersion = currentBundle?.infoDictionary?[kCFBundleVersionKey as String] as? String
      if shortVersion != nil, let currentVersion = currentVersion,
         currentVersion.compare(installingVersion, options: .numeric) == .orderedAscending
      {
        isUpgrading = true
      }
    }
  }

  public var body: some View {
    GroupBox {
      VStack(alignment: .leading, spacing: 6) {
        VStack(alignment: .leading) {
          HStack(alignment: .center) {
            if let icon = NSImage(named: "IconSansMargin") {
              Image(nsImage: icon).resizable().frame(width: 90, height: 90)
            }
            VStack(alignment: .leading) {
              HStack {
                Text("i18n:installer.APP_NAME").fontWeight(.heavy).lineLimit(1)
                Text("v\(versionString) Build \(installingVersion)").lineLimit(1)
              }.fixedSize()
              Text("i18n:installer.APP_DERIVED_FROM").font(.custom("Tahoma", size: 11))
              Text(Self.strCopyrightLabel).font(.custom("Tahoma", size: 11))
              Text("i18n:installer.DEV_CREW").font(.custom("Tahoma", size: 11)).padding([.vertical], 2)
            }
          }
          GroupBox(label: Text("i18n:installer.LICENSE_TITLE")) {
            ScrollView(.vertical, showsIndicators: true) {
              HStack {
                Text(eulaContent + "\n" + eulaContentUpstream).textSelection(.enabled)
                  .frame(maxWidth: 455)
                  .font(.custom("Tahoma", size: 11))
                Spacer()
              }
            }.padding(4).frame(height: 128)
          }
          Text("i18n:installer.EULA_PROMPT_NOTICE").bold().padding(.bottom, 2)
        }
        Divider()
        HStack(alignment: .top) {
          Text("i18n:installer.DISCLAIMER_TEXT")
            .font(.custom("Tahoma", size: 11))
            .opacity(0.5)
            .frame(maxWidth: .infinity)
          VStack(spacing: 4) {
            Button { installationButtonClicked() } label: {
              Text(isUpgrading ? "i18n:installer.DO_APP_UPGRADE" : "i18n:installer.ACCEPT_INSTALLATION")
                .bold().frame(width: 114)
            }
            .keyboardShortcut(.defaultAction)
            .disabled(!isCancelButtonEnabled)
            Button(role: .cancel) { NSApp.terminateWithDelay() } label: {
              Text("i18n:installer.CANCEL_INSTALLATION").frame(width: 114)
            }
            .keyboardShortcut(.cancelAction)
            .disabled(!isAgreeButtonEnabled)
          }.fixedSize(horizontal: true, vertical: true)
        }
        Spacer()
      }
      .font(.custom("Tahoma", size: 12))
      .padding(4)
    }
    // ALERTS
    .alert(AlertType.installationFailed.title, isPresented: $isShowingAlertForFailedInstallation) {
      Button(role: .cancel) { NSApp.terminateWithDelay() } label: { Text("Cancel") }
    } message: {
      Text(AlertType.installationFailed.message)
    }
    .alert(AlertType.missingAfterRegistration.title, isPresented: $isShowingAlertForMissingPostInstall) {
      Button(role: .cancel) { NSApp.terminateWithDelay() } label: { Text("Abort") }
    } message: {
      Text(AlertType.missingAfterRegistration.message)
    }
    .alert(currentAlertContent.title, isPresented: $isShowingPostInstallNotification) {
      Button(role: .cancel) { NSApp.terminateWithDelay() } label: {
        Text(currentAlertContent == .postInstallWarning ? "Continue" : "OK")
      }
    } message: {
      Text(currentAlertContent.message)
    }
    // SHEET FOR STOPPING THE OLD VERSION
    .sheet(isPresented: $pendingSheetPresenting) {
      // TODO: Tasks after sheet gets closed by `dismiss()`.
    } content: {
      Text("i18n:installer.STOPPING_THE_OLD_VERSION").frame(width: 407, height: 144)
        .onReceive(timer) { _ in
          if timeRemaining > 0 {
            if Reloc.isAppBundleTranslocated(atPath: kTargetPartialPath) == false {
              pendingSheetPresenting = false
              isTranslocationFinished = true
              installInputMethod(
                previousExists: true,
                previousVersionNotFullyDeactivatedWarning: false
              )
            }
            timeRemaining -= 1
          } else {
            pendingSheetPresenting = false
            isTranslocationFinished = false
            installInputMethod(
              previousExists: true,
              previousVersionNotFullyDeactivatedWarning: true
            )
          }
        }
    }
    // OTHER
    .padding(12)
    .frame(width: 533, alignment: .topLeading)
    .navigationTitle(mainWindowTitle)
    .fixedSize()
    .foregroundStyle(Color(nsColor: NSColor.textColor))
    .background(Color(nsColor: NSColor.windowBackgroundColor))
    .clipShape(RoundedRectangle(cornerRadius: 16))
    .frame(minWidth: 533, idealWidth: 533, maxWidth: 533,
           minHeight: 386, idealHeight: 386, maxHeight: 386,
           alignment: .top)
  }

  func installationButtonClicked() {
    isCancelButtonEnabled = false
    isAgreeButtonEnabled = false
    removeThenInstallInputMethod()
  }
}