/*
 * Copyright (C) 2014 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.camera.hardware;

import com.android.camera.app.CameraProvider;
import com.android.camera.util.GcamHelper;
import com.android.ex.camera2.portability.CameraCapabilities;

/**
 * HardwareSpecImpl is the default implementation of
 * {@link com.android.camera.hardware.HardwareSpec} for
 * a camera device opened using the {@link android.hardware.Camera}
 * api.
 */
public class HardwareSpecImpl implements HardwareSpec {

    private final boolean mIsFrontCameraSupported;
    private final boolean mIsHdrSupported;
    private final boolean mIsHdrPlusSupported;
    private final boolean mIsFlashSupported;

    /**
     * Compute the supported values for all
     * {@link com.android.camera.hardware.HardwareSpec} methods
     */
    public HardwareSpecImpl(CameraProvider provider, CameraCapabilities capabilities) {
        // Cache whether front camera is supported.
        mIsFrontCameraSupported = (provider.getFirstFrontCameraId() != -1);

        // Cache whether hdr is supported.
        mIsHdrSupported = capabilities.supports(CameraCapabilities.SceneMode.HDR);

        // Cache whether hdr plus is supported.
        mIsHdrPlusSupported = GcamHelper.hasGcamCapture();

        // Cache whether flash is supported.
        mIsFlashSupported = isFlashSupported(capabilities);
    }

    @Override
    public boolean isFrontCameraSupported() {
        return mIsFrontCameraSupported;
    }

    @Override
    public boolean isHdrSupported() {
        return mIsHdrSupported;
    }

    @Override
    public boolean isHdrPlusSupported() {
        return mIsHdrPlusSupported;
    }

    @Override
    public boolean isFlashSupported() {
        return mIsFlashSupported;
    }

    /**
     * Returns whether flash is supported and flash has more than
     * one possible value.
     */
    private boolean isFlashSupported(CameraCapabilities capabilities) {
        return (capabilities.supports(CameraCapabilities.FlashMode.AUTO) || capabilities.supports
                (CameraCapabilities.FlashMode.ON));
    }
}