/*
 * Copyright (C) 2018 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.tradefed.device;

import com.android.ddmlib.IDevice;
import com.android.ddmlib.IShellOutputReceiver;

import org.easymock.EasyMock;
import org.easymock.IAnswer;

class MockDeviceHelper {
    /**
     * Helper method to build a response to a {@link IDevice#executeShellCommand(String,
     * IShellOutputReceiver)} call.
     *
     * @param mockDevice the EasyMock created {@link IDevice}
     * @param expectedCommand the shell command to expect or null to skip verification of command
     * @param response the response to simulate
     * @param asStub whether to set a single expectation or a stub expectation. A 'stub' expectation
     *     will return the same result for multiple calls to the method
     */
    @SuppressWarnings("unchecked")
    static void injectShellResponse(
            IDevice mockDevice, final String expectedCommand, final String response, boolean asStub)
            throws Exception {
        IAnswer<Object> shellAnswer =
                new IAnswer<Object>() {
                    @Override
                    public Object answer() throws Throwable {
                        IShellOutputReceiver receiver =
                                (IShellOutputReceiver) EasyMock.getCurrentArguments()[1];
                        byte[] inputData = response.getBytes();
                        receiver.addOutput(inputData, 0, inputData.length);
                        receiver.flush();
                        return null;
                    }
                };
        if (expectedCommand != null) {
            mockDevice.executeShellCommand(
                    EasyMock.eq(expectedCommand), EasyMock.<IShellOutputReceiver>anyObject());
        } else {
            mockDevice.executeShellCommand(
                    EasyMock.<String>anyObject(), EasyMock.<IShellOutputReceiver>anyObject());
        }
        if (asStub) {
            EasyMock.expectLastCall().andStubAnswer(shellAnswer);
        } else {
            EasyMock.expectLastCall().andAnswer(shellAnswer);
        }
    }
}