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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.result.test;

import com.yahoo.search.Query;
import com.yahoo.search.result.DefaultErrorHit;
import com.yahoo.search.result.ErrorHit;
import com.yahoo.search.result.ErrorMessage;
import com.yahoo.search.result.Hit;
import com.yahoo.search.result.HitGroup;
import org.junit.jupiter.api.Test;

import java.util.Arrays;
import java.util.List;
import java.util.Optional;

import static org.junit.jupiter.api.Assertions.*;

/**
 * @author bratseth
 */
public class HitGroupTestCase {

    @Test
    void testErrorsConsistencyUsingErrorOperations() {
        HitGroup hits = new HitGroup();

        Query query = new Query();
        query.errors().add(ErrorMessage.createIllegalQuery("test1"));
        query.errors().add(ErrorMessage.createTimeout("test2"));
        hits.setQuery(query);

        hits.addError(ErrorMessage.createForbidden("test3"));
        hits.addError(ErrorMessage.createUnspecifiedError("test4"));

        assertEquals(4, hits.getErrorHit().errors().size());
        assertEquals(0, query.errors().size());
        assertEquals(Optional.of(hits.getErrorHit()), errorHitIn(hits.asList()));

        DefaultErrorHit removedErrors = hits.removeErrorHit();
        assertNotNull(removedErrors);
        assertEquals(4, removedErrors.errors().size());
        assertNull(hits.get(removedErrors.getId().toString()));
        assertFalse(errorHitIn(hits.asList()).isPresent());

        assertNull(hits.removeErrorHit());
    }

    @Test
    void testErrorsConsistencyUsingHitOperations() {
        HitGroup hits = new HitGroup();

        Query query = new Query();
        query.errors().add(ErrorMessage.createIllegalQuery("test1"));
        query.errors().add(ErrorMessage.createTimeout("test2"));
        hits.setQuery(query);

        DefaultErrorHit errors = new DefaultErrorHit("source", ErrorMessage.createForbidden("test3"));
        errors.addError(ErrorMessage.createUnspecifiedError("test4"));
        hits.add(errors);

        assertEquals(4, hits.getErrorHit().errors().size());
        assertEquals(0, query.errors().size());
        assertEquals(Optional.of(hits.getErrorHit()), errorHitIn(hits.asList()));

        DefaultErrorHit removedErrors = (DefaultErrorHit) hits.remove(errors.getId());
        assertNotNull(removedErrors);
        assertEquals(4, removedErrors.errors().size());
        assertNull(hits.get(removedErrors.getId().toString()));
        assertFalse(errorHitIn(hits.asList()).isPresent());

        assertNull(hits.remove(errors.getId()));
    }

    @Test
    void testRecursiveGet() {
        // Level 1
        HitGroup g1 = new HitGroup();
        g1.add(new Hit("1"));

        // Level 2
        HitGroup g1_1 = new HitGroup();
        g1_1.add(new Hit("1.1"));
        g1.add(g1_1);

        HitGroup g1_2 = new HitGroup();
        g1_2.add(new Hit("1.2"));
        g1.add(g1_2);

        // Level 3
        HitGroup g1_1_1 = new HitGroup();
        g1_1_1.add(new Hit("1.1.1"));
        g1_1.add(g1_1_1);

        HitGroup g1_1_2 = new HitGroup();
        g1_1_2.add(new Hit("1.1.2"));
        g1_1.add(g1_1_2);

        HitGroup g1_2_1 = new HitGroup();
        g1_2_1.add(new Hit("1.2.1"));
        g1_2.add(g1_2_1);

        HitGroup g1_2_2 = new HitGroup();
        g1_2_2.add(new Hit("1.2.2"));
        g1_2.add(g1_2_2);

        // Level 4
        HitGroup g1_1_1_1 = new HitGroup();
        g1_1_1_1.add(new Hit("1.1.1.1"));
        g1_1_1.add(g1_1_1_1);

        assertNotNull(g1.get("1"));
        assertNotNull(g1.get("1.1"));
        assertNotNull(g1.get("1.2"));
        assertNotNull(g1.get("1.1.1"));
        assertNotNull(g1.get("1.1.2"));
        assertNotNull(g1.get("1.2.1"));
        assertNotNull(g1.get("1.2.2"));
        assertNotNull(g1.get("1.1.1.1"));

        assertNotNull(g1.get("1", -1));
        assertNotNull(g1.get("1.1", -1));
        assertNotNull(g1.get("1.2", -1));
        assertNotNull(g1.get("1.1.1", -1));
        assertNotNull(g1.get("1.1.2", -1));
        assertNotNull(g1.get("1.2.1", -1));
        assertNotNull(g1.get("1.2.2", -1));
        assertNotNull(g1.get("1.1.1.1", -1));

        assertNotNull(g1.get("1", 0));
        assertNull(g1.get("1.1", 0));
        assertNull(g1.get("1.2", 0));
        assertNull(g1.get("1.1.1", 0));
        assertNull(g1.get("1.1.2", 0));
        assertNull(g1.get("1.2.1", 0));
        assertNull(g1.get("1.2.2", 0));
        assertNull(g1.get("1.1.1.1", 0));

        assertNotNull(g1.get("1", 1));
        assertNotNull(g1.get("1.1", 1));
        assertNotNull(g1.get("1.2", 1));
        assertNull(g1.get("1.1.1", 1));
        assertNull(g1.get("1.1.2", 1));
        assertNull(g1.get("1.2.1", 1));
        assertNull(g1.get("1.2.2", 1));
        assertNull(g1.get("1.1.1.1", 1));

        assertNotNull(g1.get("1", 2));
        assertNotNull(g1.get("1.1", 2));
        assertNotNull(g1.get("1.2", 2));
        assertNotNull(g1.get("1.1.1", 2));
        assertNotNull(g1.get("1.1.2", 2));
        assertNotNull(g1.get("1.2.1", 2));
        assertNotNull(g1.get("1.2.2", 2));
        assertNull(g1.get("1.1.1.1", 2));

        assertNotNull(g1.get("1.1.1.1", 3));

        assertNull(g1.get("3", 2));
    }

    @Test
    void testThatHitGroupIsUnFillable() {
        HitGroup hg = new HitGroup("test");
        {
            Hit hit = new Hit("http://nalle.balle/1.html", 832);
            hit.setField("url", "http://nalle.balle/1.html");
            hit.setField("clickurl", "javascript:openWindow('http://www.foo');");
            hit.setField("attributes", Arrays.asList("typevideo"));
            hg.add(hit);
        }
        {
            Hit hit = new Hit("http://nalle.balle/2.html", 442);
            hit.setField("url", "http://nalle.balle/2.html");
            hit.setField("clickurl", "");
            hit.setField("attributes", Arrays.asList("typevideo"));
            hg.add(hit);
        }
        assertFalse(hg.isFillable());
        assertTrue(hg.isFilled("anyclass"));
        assertNull(hg.getFilled());
    }

    @Test
    void testThatHitGroupIsFillable() {
        HitGroup hg = new HitGroup("test");
        {
            Hit hit = new Hit("http://nalle.balle/1.html", 832);
            hit.setField("url", "http://nalle.balle/1.html");
            hit.setField("clickurl", "javascript:openWindow('http://www.foo');");
            hit.setField("attributes", Arrays.asList("typevideo"));
            hit.setFillable();
            hg.add(hit);
        }
        {
            Hit hit = new Hit("http://nalle.balle/2.html", 442);
            hit.setField("url", "http://nalle.balle/2.html");
            hit.setField("clickurl", "");
            hit.setField("attributes", Arrays.asList("typevideo"));
            hit.setFillable();
            hg.add(hit);
        }
        assertTrue(hg.isFillable());
        assertFalse(hg.isFilled("anyclass"));
        assertTrue(hg.getFilled().isEmpty());
    }

    @Test
    void testThatHitGroupIsFillableAfterFillableChangeunderTheHood() {
        HitGroup hg = new HitGroup("test");
        {
            Hit hit = new Hit("http://nalle.balle/1.html", 832);
            hit.setField("url", "http://nalle.balle/1.html");
            hit.setField("clickurl", "javascript:openWindow('http://www.foo');");
            hit.setField("attributes", Arrays.asList("typevideo"));
            hg.add(hit);
        }
        {
            Hit hit = new Hit("http://nalle.balle/2.html", 442);
            hit.setField("url", "http://nalle.balle/2.html");
            hit.setField("clickurl", "");
            hit.setField("attributes", Arrays.asList("typevideo"));
            hg.add(hit);
        }
        assertFalse(hg.isFillable());
        assertTrue(hg.isFilled("anyclass"));

        for (Hit h : hg.asList()) {
            h.setFillable();
        }

        HitGroup toplevel = new HitGroup("toplevel");
        toplevel.add(hg);

        assertTrue(toplevel.isFillable());
        assertNotNull(toplevel.getFilled());
        assertFalse(toplevel.isFilled("anyclass"));

        assertTrue(hg.isFillable());
        assertNotNull(hg.getFilled());
        assertFalse(hg.isFilled("anyclass"));
        assertTrue(hg.getFilled().isEmpty());
    }
    
    /** Returns the (first) error hit in the given list, or empty if none */
    private Optional<ErrorHit> errorHitIn(List<Hit> hits) {
        return hits.stream().filter(h -> h instanceof ErrorHit).map(ErrorHit.class::cast).findFirst();
    }

}