// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.model.content.cluster;

import com.yahoo.vespa.model.builder.xml.dom.ModelElement;
import com.yahoo.vespa.model.content.TuningDispatch;
import org.apache.commons.io.input.CharSequenceInputStream;
import org.junit.Test;

import javax.xml.parsers.DocumentBuilderFactory;
import java.nio.charset.StandardCharsets;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;

/**
 * @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen Hult</a>
 */
public class DomTuningDispatchBuilderTest {

    @Test
    public void requireThatDefaultsAreNull() throws Exception {
        TuningDispatch dispatch = newTuningDispatch(
                "<content/>");
        assertNull(dispatch.getMaxHitsPerPartition());
    }

    @Test
    public void requireThatEmptyTuningIsSafe() throws Exception {
        TuningDispatch dispatch = newTuningDispatch(
                "<content>" +
                "  <tuning/>" +
                "</content>");
        assertNull(dispatch.getMaxHitsPerPartition());
    }

    @Test
    public void requireThatEmptydispatchIsSafe() throws Exception {
        TuningDispatch dispatch = newTuningDispatch(
                "<content>" +
                "  <tuning>" +
                "    <dispatch/>" +
                "  </tuning>" +
                "</content>");
        assertNull(dispatch.getMaxHitsPerPartition());
        assertNull(dispatch.getMinGroupCoverage());
        assertNull(dispatch.getMinActiveDocsCoverage());
        assertTrue(TuningDispatch.DispatchPolicy.ROUNDROBIN == dispatch.getDispatchPolicy());
    }

    @Test
    public void requireThatTuningDispatchCanBeBuilt() throws Exception {
        TuningDispatch dispatch = newTuningDispatch(
                "<content>" +
                "  <tuning>" +
                "    <dispatch>" +
                "      <max-hits-per-partition>69</max-hits-per-partition>" +
                "      <min-group-coverage>7.5</min-group-coverage>" +
                "      <min-active-docs-coverage>12.5</min-active-docs-coverage>" +
                "    </dispatch>" +
                "  </tuning>" +
                "</content>");
        assertEquals(69, dispatch.getMaxHitsPerPartition().intValue());
        assertEquals(7.5, dispatch.getMinGroupCoverage().doubleValue(), 0.0);
        assertEquals(12.5, dispatch.getMinActiveDocsCoverage().doubleValue(), 0.0);
    }
    @Test
    public void requireThatTuningDispatchPolicyRoundRobin() throws Exception {
        TuningDispatch dispatch = newTuningDispatch(
                "<content>" +
                        "  <tuning>" +
                        "    <dispatch>" +
                        "      <dispatch-policy>round-robin</dispatch-policy>" +
                        "    </dispatch>" +
                        "  </tuning>" +
                        "</content>");
        assertTrue(TuningDispatch.DispatchPolicy.ROUNDROBIN == dispatch.getDispatchPolicy());
    }
    @Test
    public void requireThatTuningDispatchPolicyRandom() throws Exception {
        TuningDispatch dispatch = newTuningDispatch(
                "<content>" +
                        "  <tuning>" +
                        "    <dispatch>" +
                        "      <dispatch-policy>random</dispatch-policy>" +
                        "    </dispatch>" +
                        "  </tuning>" +
                        "</content>");
        assertTrue(TuningDispatch.DispatchPolicy.RANDOM == dispatch.getDispatchPolicy());
    }

    private static TuningDispatch newTuningDispatch(String xml) throws Exception {
        return DomTuningDispatchBuilder.build(
                new ModelElement(DocumentBuilderFactory.newInstance()
                                                       .newDocumentBuilder()
                                                       .parse(new CharSequenceInputStream(xml, StandardCharsets.UTF_8))
                                                       .getDocumentElement()));
    }
}