/*
 * Copyright (C) 2023 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.systemui.deviceentry.ui.viewmodel

import android.content.Context
import android.view.MotionEvent
import com.android.systemui.accessibility.domain.interactor.AccessibilityInteractor
import com.android.systemui.biometrics.UdfpsUtils
import com.android.systemui.biometrics.domain.interactor.UdfpsOverlayInteractor
import com.android.systemui.dagger.qualifiers.Application
import com.android.systemui.deviceentry.domain.interactor.DeviceEntryUdfpsInteractor
import com.android.systemui.keyguard.ui.view.DeviceEntryIconView
import com.android.systemui.keyguard.ui.viewmodel.DeviceEntryForegroundViewModel
import com.android.systemui.keyguard.ui.viewmodel.DeviceEntryIconViewModel
import com.android.systemui.res.R
import javax.inject.Inject
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.combine

/** Models the UI state for the non-alternate bouncer UDFPS accessibility overlay */
class DeviceEntryUdfpsAccessibilityOverlayViewModel
@Inject
constructor(
    @Application private val applicationContext: Context,
    deviceEntryUdfpsInteractor: DeviceEntryUdfpsInteractor,
    udfpsOverlayInteractor: UdfpsOverlayInteractor,
    udfpsUtils: UdfpsUtils,
    accessibilityInteractor: AccessibilityInteractor,
    private val deviceEntryIconViewModel: DeviceEntryIconViewModel,
    private val deviceEntryFgIconViewModel: DeviceEntryForegroundViewModel,
) :
    UdfpsAccessibilityOverlayViewModel(
        applicationContext,
        udfpsOverlayInteractor,
        deviceEntryUdfpsInteractor,
        udfpsUtils,
        accessibilityInteractor,
    ) {

    val customizeLockscreenString =
        applicationContext.resources.getString(R.string.accessibility_desc_customize_lock_screen)

    /** Overlay is only visible if the UDFPS icon is visible on the keyguard. */
    override fun isVisibleWhenTouchExplorationEnabled(): Flow<Boolean> =
        combine(
            deviceEntryFgIconViewModel.viewModel,
            deviceEntryIconViewModel.deviceEntryViewAlpha,
        ) { iconViewModel, alpha ->
            iconViewModel.type == DeviceEntryIconView.IconType.FINGERPRINT &&
                !iconViewModel.useAodVariant &&
                alpha == 1f
        }

    /** Give directional feedback to help the user authenticate with UDFPS. */
    override fun getUdfpsDirectionalFeedbackOnHoverEnterOrMove(
        event: MotionEvent,
        includeLockscreenContentDescription: Boolean,
    ): CharSequence? {
        val udfpsGuidance = super.getUdfpsDirectionalFeedbackOnHoverEnterOrMove(event)
        val contentDescription: CharSequence? =
            if (udfpsGuidance != null && includeLockscreenContentDescription) {
                customizeLockscreenString + "\n" + udfpsGuidance
            } else {
                udfpsGuidance
            }

        return contentDescription
    }
}