AzureCommunicationUI/sdk/AzureCommunicationUICalling/Sources/Presentation/SwiftUI/Setup/SetupViewComponent/PreviewAreaViewModel.swift

//
//  Copyright (c) Microsoft Corporation. All rights reserved.
//  Licensed under the MIT License.
//

import Foundation
import Combine
import UIKit

class PreviewAreaViewModel: ObservableObject {
    private var cameraPermission: AppPermission.Status = .unknown
    private var audioPermission: AppPermission.Status = .unknown

    @Published var isPermissionsDenied = false

    var goToSettingsButtonViewModel: PrimaryButtonViewModel!
    let localVideoViewModel: LocalVideoViewModel!
    private let localizationProvider: LocalizationProviderProtocol

    init(compositeViewModelFactory: CompositeViewModelFactoryProtocol,
         dispatchAction: @escaping ActionDispatch,
         localizationProvider: LocalizationProviderProtocol) {
        localVideoViewModel = compositeViewModelFactory.makeLocalVideoViewModel(dispatchAction: dispatchAction)
        self.localizationProvider = localizationProvider

        goToSettingsButtonViewModel = compositeViewModelFactory.makePrimaryButtonViewModel(
            buttonStyle: .primaryOutline,
            buttonLabel: self.localizationProvider
                .getLocalizedString(.goToSettings)) { [weak self] in
                guard let self = self else {
                    return
                }
                self.goToSettingsButtonTapped()
        }
        goToSettingsButtonViewModel.update(
            accessibilityLabel: self.localizationProvider.getLocalizedString(.goToSettings))
    }

    func getPermissionWarningIcon() -> CompositeIcon {
        let displayIcon: CompositeIcon

        if self.audioPermission == .granted {
            displayIcon = .videoOff
        } else if self.cameraPermission == .denied {
            displayIcon = .warning
        } else {
            displayIcon = .micOff
        }

        return displayIcon
    }

    func getPermissionWarningText() -> String {
        let displayText: String
        if self.audioPermission == .granted {
            displayText = localizationProvider.getLocalizedString(.cameraDisabled)
        } else if self.cameraPermission == .denied {
            displayText = localizationProvider.getLocalizedString(.audioAndCameraDisabled)
        } else {
            displayText = localizationProvider.getLocalizedString(.audioDisabled)
        }
        return displayText
    }

    func update(localUserState: LocalUserState, permissionState: PermissionState, visibilityState: VisibilityState) {
        self.cameraPermission = permissionState.cameraPermission
        self.audioPermission = permissionState.audioPermission
        updatePermissionsState()
        localVideoViewModel.update(localUserState: localUserState, visibilityState: visibilityState)
    }

    private func updatePermissionsState() {
        let isPermissionDenied = cameraPermission == .denied || audioPermission == .denied
        if isPermissionDenied != self.isPermissionsDenied {
            self.isPermissionsDenied = isPermissionDenied
        }
    }

    private func goToSettingsButtonTapped() {
        guard let url = URL(string: UIApplication.openSettingsURLString), UIApplication.shared.canOpenURL(url) else {
            return
        }
        UIApplication.shared.open(url, options: [:], completionHandler: nil)
    }
}