/*
 * Copyright (C) 2011 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;

import static android.net.NetworkStats.TAG_NONE;

import android.test.suitebuilder.annotation.SmallTest;

import junit.framework.TestCase;

@SmallTest
public class NetworkStatsTest extends TestCase {

    private static final String TEST_IFACE = "test0";
    private static final int TEST_UID = 1001;
    private static final long TEST_START = 1194220800000L;

    public void testFindIndex() throws Exception {
        final NetworkStats stats = new NetworkStats(TEST_START, 3)
                .addEntry(TEST_IFACE, 100, TAG_NONE, 1024L, 0L)
                .addEntry(TEST_IFACE, 101, TAG_NONE, 0L, 1024L)
                .addEntry(TEST_IFACE, 102, TAG_NONE, 1024L, 1024L);

        assertEquals(2, stats.findIndex(TEST_IFACE, 102, TAG_NONE));
        assertEquals(2, stats.findIndex(TEST_IFACE, 102, TAG_NONE));
        assertEquals(0, stats.findIndex(TEST_IFACE, 100, TAG_NONE));
        assertEquals(-1, stats.findIndex(TEST_IFACE, 6, TAG_NONE));
    }

    public void testAddEntryGrow() throws Exception {
        final NetworkStats stats = new NetworkStats(TEST_START, 2);

        assertEquals(0, stats.size);
        assertEquals(2, stats.iface.length);

        stats.addEntry(TEST_IFACE, TEST_UID, TAG_NONE, 1L, 2L);
        stats.addEntry(TEST_IFACE, TEST_UID, TAG_NONE, 2L, 2L);

        assertEquals(2, stats.size);
        assertEquals(2, stats.iface.length);

        stats.addEntry(TEST_IFACE, TEST_UID, TAG_NONE, 3L, 4L);
        stats.addEntry(TEST_IFACE, TEST_UID, TAG_NONE, 4L, 4L);
        stats.addEntry(TEST_IFACE, TEST_UID, TAG_NONE, 5L, 5L);

        assertEquals(5, stats.size);
        assertTrue(stats.iface.length >= 5);

        assertEquals(1L, stats.rx[0]);
        assertEquals(2L, stats.rx[1]);
        assertEquals(3L, stats.rx[2]);
        assertEquals(4L, stats.rx[3]);
        assertEquals(5L, stats.rx[4]);
    }

    public void testCombineExisting() throws Exception {
        final NetworkStats stats = new NetworkStats(TEST_START, 10);

        stats.addEntry(TEST_IFACE, 1001, TAG_NONE, 512L, 256L);
        stats.addEntry(TEST_IFACE, 1001, 0xff, 128L, 128L);
        stats.combineEntry(TEST_IFACE, 1001, TAG_NONE, -128L, -128L);

        assertStatsEntry(stats, 0, TEST_IFACE, 1001, TAG_NONE, 384L, 128L);
        assertStatsEntry(stats, 1, TEST_IFACE, 1001, 0xff, 128L, 128L);

        // now try combining that should create row
        stats.combineEntry(TEST_IFACE, 5005, TAG_NONE, 128L, 128L);
        assertStatsEntry(stats, 2, TEST_IFACE, 5005, TAG_NONE, 128L, 128L);
        stats.combineEntry(TEST_IFACE, 5005, TAG_NONE, 128L, 128L);
        assertStatsEntry(stats, 2, TEST_IFACE, 5005, TAG_NONE, 256L, 256L);
    }

    public void testSubtractIdenticalData() throws Exception {
        final NetworkStats before = new NetworkStats(TEST_START, 2)
                .addEntry(TEST_IFACE, 100, TAG_NONE, 1024L, 0L)
                .addEntry(TEST_IFACE, 101, TAG_NONE, 0L, 1024L);

        final NetworkStats after = new NetworkStats(TEST_START, 2)
                .addEntry(TEST_IFACE, 100, TAG_NONE, 1024L, 0L)
                .addEntry(TEST_IFACE, 101, TAG_NONE, 0L, 1024L);

        final NetworkStats result = after.subtract(before);

        // identical data should result in zero delta
        assertEquals(0, result.rx[0]);
        assertEquals(0, result.tx[0]);
        assertEquals(0, result.rx[1]);
        assertEquals(0, result.tx[1]);
    }

    public void testSubtractIdenticalRows() throws Exception {
        final NetworkStats before = new NetworkStats(TEST_START, 2)
                .addEntry(TEST_IFACE, 100, TAG_NONE, 1024L, 0L)
                .addEntry(TEST_IFACE, 101, TAG_NONE, 0L, 1024L);

        final NetworkStats after = new NetworkStats(TEST_START, 2)
                .addEntry(TEST_IFACE, 100, TAG_NONE, 1025L, 2L)
                .addEntry(TEST_IFACE, 101, TAG_NONE, 3L, 1028L);

        final NetworkStats result = after.subtract(before);

        // expect delta between measurements
        assertEquals(1, result.rx[0]);
        assertEquals(2, result.tx[0]);
        assertEquals(3, result.rx[1]);
        assertEquals(4, result.tx[1]);
    }

    public void testSubtractNewRows() throws Exception {
        final NetworkStats before = new NetworkStats(TEST_START, 2)
                .addEntry(TEST_IFACE, 100, TAG_NONE, 1024L, 0L)
                .addEntry(TEST_IFACE, 101, TAG_NONE, 0L, 1024L);

        final NetworkStats after = new NetworkStats(TEST_START, 3)
                .addEntry(TEST_IFACE, 100, TAG_NONE, 1024L, 0L)
                .addEntry(TEST_IFACE, 101, TAG_NONE, 0L, 1024L)
                .addEntry(TEST_IFACE, 102, TAG_NONE, 1024L, 1024L);

        final NetworkStats result = after.subtract(before);

        // its okay to have new rows
        assertEquals(0, result.rx[0]);
        assertEquals(0, result.tx[0]);
        assertEquals(0, result.rx[1]);
        assertEquals(0, result.tx[1]);
        assertEquals(1024, result.rx[2]);
        assertEquals(1024, result.tx[2]);
    }

    private static void assertStatsEntry(
            NetworkStats stats, int i, String iface, int uid, int tag, long rx, long tx) {
        assertEquals(iface, stats.iface[i]);
        assertEquals(uid, stats.uid[i]);
        assertEquals(tag, stats.tag[i]);
        assertEquals(rx, stats.rx[i]);
        assertEquals(tx, stats.tx[i]);
    }

}