/*
 * 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 android.net.nsd;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import android.net.Network;
import android.os.Build;
import android.os.Bundle;
import android.os.Parcel;
import android.os.StrictMode;

import androidx.test.filters.SmallTest;

import com.android.testutils.DevSdkIgnoreRule;
import com.android.testutils.DevSdkIgnoreRunner;

import org.junit.Test;
import org.junit.runner.RunWith;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.Map;

@RunWith(DevSdkIgnoreRunner.class)
@SmallTest
@DevSdkIgnoreRule.IgnoreUpTo(Build.VERSION_CODES.R)
public class NsdServiceInfoTest {

    public final static InetAddress LOCALHOST;
    static {
        // Because test.
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);

        InetAddress _host = null;
        try {
            _host = InetAddress.getLocalHost();
        } catch (UnknownHostException e) { }
        LOCALHOST = _host;
    }

    @Test
    public void testLimits() throws Exception {
        NsdServiceInfo info = new NsdServiceInfo();

        // Non-ASCII keys.
        boolean exceptionThrown = false;
        try {
            info.setAttribute("猫", "meow");
        } catch (IllegalArgumentException e) {
            exceptionThrown = true;
        }
        assertTrue(exceptionThrown);
        assertEmptyServiceInfo(info);

        // ASCII keys with '=' character.
        exceptionThrown = false;
        try {
            info.setAttribute("kitten=", "meow");
        } catch (IllegalArgumentException e) {
            exceptionThrown = true;
        }
        assertTrue(exceptionThrown);
        assertEmptyServiceInfo(info);

        // Single key + value length too long.
        exceptionThrown = false;
        try {
            String longValue = "loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo" +
                    "oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo" +
                    "oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo" +
                    "ooooooooooooooooooooooooooooong";  // 248 characters.
            info.setAttribute("longcat", longValue);  // Key + value == 255 characters.
        } catch (IllegalArgumentException e) {
            exceptionThrown = true;
        }
        assertTrue(exceptionThrown);
        assertEmptyServiceInfo(info);

        // Total TXT record length too long.
        exceptionThrown = false;
        int recordsAdded = 0;
        try {
            for (int i = 100; i < 300; ++i) {
                // 6 char key + 5 char value + 2 bytes overhead = 13 byte record length.
                String key = String.format("key%d", i);
                info.setAttribute(key, "12345");
                recordsAdded++;
            }
        } catch (IllegalArgumentException e) {
            exceptionThrown = true;
        }
        assertTrue(exceptionThrown);
        assertTrue(100 == recordsAdded);
        assertTrue(info.getTxtRecord().length == 1300);
    }

    @Test
    public void testParcel() throws Exception {
        NsdServiceInfo emptyInfo = new NsdServiceInfo();
        checkParcelable(emptyInfo);

        NsdServiceInfo fullInfo = new NsdServiceInfo();
        fullInfo.setServiceName("kitten");
        fullInfo.setServiceType("_kitten._tcp");
        fullInfo.setPort(4242);
        fullInfo.setHost(LOCALHOST);
        fullInfo.setNetwork(new Network(123));
        fullInfo.setInterfaceIndex(456);
        checkParcelable(fullInfo);

        NsdServiceInfo noHostInfo = new NsdServiceInfo();
        noHostInfo.setServiceName("kitten");
        noHostInfo.setServiceType("_kitten._tcp");
        noHostInfo.setPort(4242);
        checkParcelable(noHostInfo);

        NsdServiceInfo attributedInfo = new NsdServiceInfo();
        attributedInfo.setServiceName("kitten");
        attributedInfo.setServiceType("_kitten._tcp");
        attributedInfo.setPort(4242);
        attributedInfo.setHost(LOCALHOST);
        attributedInfo.setAttribute("color", "pink");
        attributedInfo.setAttribute("sound", (new String("にゃあ")).getBytes("UTF-8"));
        attributedInfo.setAttribute("adorable", (String) null);
        attributedInfo.setAttribute("sticky", "yes");
        attributedInfo.setAttribute("siblings", new byte[] {});
        attributedInfo.setAttribute("edge cases", new byte[] {0, -1, 127, -128});
        attributedInfo.removeAttribute("sticky");
        checkParcelable(attributedInfo);

        // Sanity check that we actually wrote attributes to attributedInfo.
        assertTrue(attributedInfo.getAttributes().keySet().contains("adorable"));
        String sound = new String(attributedInfo.getAttributes().get("sound"), "UTF-8");
        assertTrue(sound.equals("にゃあ"));
        byte[] edgeCases = attributedInfo.getAttributes().get("edge cases");
        assertTrue(Arrays.equals(edgeCases, new byte[] {0, -1, 127, -128}));
        assertFalse(attributedInfo.getAttributes().keySet().contains("sticky"));
    }

    public void checkParcelable(NsdServiceInfo original) {
        // Write to parcel.
        Parcel p = Parcel.obtain();
        Bundle writer = new Bundle();
        writer.putParcelable("test_info", original);
        writer.writeToParcel(p, 0);

        // Extract from parcel.
        p.setDataPosition(0);
        Bundle reader = p.readBundle();
        reader.setClassLoader(NsdServiceInfo.class.getClassLoader());
        NsdServiceInfo result = reader.getParcelable("test_info");

        // Assert equality of base fields.
        assertEquals(original.getServiceName(), result.getServiceName());
        assertEquals(original.getServiceType(), result.getServiceType());
        assertEquals(original.getHost(), result.getHost());
        assertTrue(original.getPort() == result.getPort());
        assertEquals(original.getNetwork(), result.getNetwork());
        assertEquals(original.getInterfaceIndex(), result.getInterfaceIndex());

        // Assert equality of attribute map.
        Map<String, byte[]> originalMap = original.getAttributes();
        Map<String, byte[]> resultMap = result.getAttributes();
        assertEquals(originalMap.keySet(), resultMap.keySet());
        for (String key : originalMap.keySet()) {
            assertTrue(Arrays.equals(originalMap.get(key), resultMap.get(key)));
        }
    }

    public void assertEmptyServiceInfo(NsdServiceInfo shouldBeEmpty) {
        byte[] txtRecord = shouldBeEmpty.getTxtRecord();
        if (txtRecord == null || txtRecord.length == 0) {
            return;
        }
        fail("NsdServiceInfo.getTxtRecord did not return null but " + Arrays.toString(txtRecord));
    }
}