/*
 * Copyright (C) 2015 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 android.net.cts;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.Network;
import android.net.NetworkCapabilities;
import android.net.NetworkUtils;
import android.system.ErrnoException;
import android.system.OsConstants;
import android.test.AndroidTestCase;

import java.util.ArrayList;


public class MultinetworkApiTest extends AndroidTestCase {

    static {
        System.loadLibrary("nativemultinetwork_jni");
    }

    private static final String TAG = "MultinetworkNativeApiTest";

    /**
     * @return 0 on success
     */
    private static native int runGetaddrinfoCheck(long networkHandle);
    private static native int runSetprocnetwork(long networkHandle);
    private static native int runSetsocknetwork(long networkHandle);
    private static native int runDatagramCheck(long networkHandle);

    private ConnectivityManager mCM;

    protected void setUp() throws Exception {
        super.setUp();
        mCM = (ConnectivityManager) getContext().getSystemService(Context.CONNECTIVITY_SERVICE);
    }

    private Network[] getTestableNetworks() {
        final ArrayList<Network> testableNetworks = new ArrayList<Network>();
        for (Network network : mCM.getAllNetworks()) {
            final NetworkCapabilities nc = mCM.getNetworkCapabilities(network);
            if (nc != null
                    && nc.hasCapability(NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED)
                    && nc.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)) {
                testableNetworks.add(network);
            }
        }

        assertTrue(
                "This test requires that at least one network be connected. " +
                "Please ensure that the device is connected to a network.",
                testableNetworks.size() >= 1);
        return testableNetworks.toArray(new Network[0]);
    }

    public void testGetaddrinfo() throws ErrnoException {
        for (Network network : getTestableNetworks()) {
            int errno = runGetaddrinfoCheck(network.getNetworkHandle());
            if (errno != 0) {
                throw new ErrnoException(
                        "getaddrinfo on " + mCM.getNetworkInfo(network), -errno);
            }
        }
    }

    public void testSetprocnetwork() throws ErrnoException {
        // Hopefully no prior test in this process space has set a default network.
        assertNull(mCM.getProcessDefaultNetwork());
        assertEquals(0, NetworkUtils.getBoundNetworkForProcess());

        for (Network network : getTestableNetworks()) {
            mCM.setProcessDefaultNetwork(null);
            assertNull(mCM.getProcessDefaultNetwork());

            int errno = runSetprocnetwork(network.getNetworkHandle());
            if (errno != 0) {
                throw new ErrnoException(
                        "setprocnetwork on " + mCM.getNetworkInfo(network), -errno);
            }
            Network processDefault = mCM.getProcessDefaultNetwork();
            assertNotNull(processDefault);
            assertEquals(network, processDefault);
            // TODO: open DatagramSockets, connect them to 192.0.2.1 and 2001:db8::,
            // and ensure that the source address is in fact on this network as
            // determined by mCM.getLinkProperties(network).

            mCM.setProcessDefaultNetwork(null);
        }

        for (Network network : getTestableNetworks()) {
            NetworkUtils.bindProcessToNetwork(0);
            assertNull(mCM.getBoundNetworkForProcess());

            int errno = runSetprocnetwork(network.getNetworkHandle());
            if (errno != 0) {
                throw new ErrnoException(
                        "setprocnetwork on " + mCM.getNetworkInfo(network), -errno);
            }
            assertEquals(network, new Network(mCM.getBoundNetworkForProcess()));
            // TODO: open DatagramSockets, connect them to 192.0.2.1 and 2001:db8::,
            // and ensure that the source address is in fact on this network as
            // determined by mCM.getLinkProperties(network).

            NetworkUtils.bindProcessToNetwork(0);
        }
    }

    public void testSetsocknetwork() throws ErrnoException {
        for (Network network : getTestableNetworks()) {
            int errno = runSetsocknetwork(network.getNetworkHandle());
            if (errno != 0) {
                throw new ErrnoException(
                        "setsocknetwork on " + mCM.getNetworkInfo(network), -errno);
            }
        }
    }

    public void testNativeDatagramTransmission() throws ErrnoException {
        for (Network network : getTestableNetworks()) {
            int errno = runDatagramCheck(network.getNetworkHandle());
            if (errno != 0) {
                throw new ErrnoException(
                        "DatagramCheck on " + mCM.getNetworkInfo(network), -errno);
            }
        }
    }

    public void testNoSuchNetwork() {
        final Network eNoNet = new Network(54321);
        assertNull(mCM.getNetworkInfo(eNoNet));

        final long eNoNetHandle = eNoNet.getNetworkHandle();
        assertEquals(-OsConstants.ENONET, runSetsocknetwork(eNoNetHandle));
        assertEquals(-OsConstants.ENONET, runSetprocnetwork(eNoNetHandle));
        // TODO: correct test permissions so this call is not silently re-mapped
        // to query on the default network.
        // assertEquals(-OsConstants.ENONET, runGetaddrinfoCheck(eNoNetHandle));
    }
}