camera/camera-camera2-pipe-integration/src/main/java/androidx/camera/camera2/pipe/integration/impl/CameraMetadataIntegration.kt

/*
 * Copyright 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.
 */

@file:RequiresApi(21) // TODO: b/200306659 - Remove and replace with annotation on package-info.java

package androidx.camera.camera2.pipe.integration.impl

import android.hardware.camera2.CameraCharacteristics
import android.hardware.camera2.CaptureRequest
import android.os.Build
import androidx.annotation.RequiresApi
import androidx.camera.camera2.pipe.CameraMetadata

/**
 * Contains the CameraX-specific logic for [CameraMetadata].
 */

val CameraMetadata.availableAfModes
        get() = getOrDefault(
            CameraCharacteristics.CONTROL_AF_AVAILABLE_MODES,
            intArrayOf(CaptureRequest.CONTROL_AF_MODE_OFF)
        ).asList()

val CameraMetadata.availableAeModes
    get() = getOrDefault(
        CameraCharacteristics.CONTROL_AE_AVAILABLE_MODES,
        intArrayOf(CaptureRequest.CONTROL_AE_MODE_OFF)
    ).asList()

val CameraMetadata.availableAwbModes
    get() = getOrDefault(
        CameraCharacteristics.CONTROL_AWB_AVAILABLE_MODES,
        intArrayOf(CaptureRequest.CONTROL_AWB_MODE_OFF)
    ).asList()

/**
 * If preferredMode not available, priority is CONTINUOUS_PICTURE > AUTO > OFF
 */
fun CameraMetadata.getSupportedAfMode(preferredMode: Int) = when {
    availableAfModes.contains(preferredMode) -> {
        preferredMode
    }

    availableAfModes.contains(CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE) -> {
        CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE
    }

    availableAfModes.contains(CaptureRequest.CONTROL_AF_MODE_AUTO) -> {
        CaptureRequest.CONTROL_AF_MODE_AUTO
    }

    else -> {
        CaptureRequest.CONTROL_AF_MODE_OFF
    }
}

/**
 * If preferredMode not available, priority is AE_ON > AE_OFF
 */
fun CameraMetadata.getSupportedAeMode(preferredMode: Int) = when {
    availableAeModes.contains(preferredMode) -> {
        preferredMode
    }

    availableAeModes.contains(CaptureRequest.CONTROL_AE_MODE_ON) -> {
        CaptureRequest.CONTROL_AE_MODE_ON
    }

    else -> {
        CaptureRequest.CONTROL_AE_MODE_OFF
    }
}

private fun CameraMetadata.isAeModeSupported(aeMode: Int) = getSupportedAeMode(aeMode) == aeMode

/** Returns whether [CaptureRequest.CONTROL_AE_MODE_ON_EXTERNAL_FLASH] is supported. */
fun CameraMetadata.isExternalFlashAeModeSupported() =
    Build.VERSION.SDK_INT >= 28 &&
        isAeModeSupported(CaptureRequest.CONTROL_AE_MODE_ON_EXTERNAL_FLASH)

/**
 * If preferredMode not available, priority is AWB_AUTO > AWB_OFF
 */
fun CameraMetadata.getSupportedAwbMode(preferredMode: Int) = when {
    availableAwbModes.contains(preferredMode) -> {
        preferredMode
    }

    availableAwbModes.contains(CaptureRequest.CONTROL_AWB_MODE_AUTO) -> {
        CaptureRequest.CONTROL_AWB_MODE_AUTO
    }

    else -> {
        CaptureRequest.CONTROL_AWB_MODE_OFF
    }
}

fun <T> CameraMetadata?.getOrDefault(
    key: CameraCharacteristics.Key<T>,
    default: T
) = this?.getOrDefault(key, default) ?: default