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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.pagetemplates.engine.test;

import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.search.pagetemplates.PageTemplate;
import com.yahoo.search.pagetemplates.engine.Organizer;
import com.yahoo.search.pagetemplates.engine.Resolution;
import com.yahoo.search.pagetemplates.engine.Resolver;
import com.yahoo.search.pagetemplates.engine.resolvers.DeterministicResolver;
import com.yahoo.search.pagetemplates.model.Choice;
import com.yahoo.search.pagetemplates.model.MapChoice;
import com.yahoo.search.pagetemplates.model.PageElement;
import com.yahoo.search.pagetemplates.model.Section;
import com.yahoo.search.result.HitGroup;
import org.junit.jupiter.api.Test;

import java.util.List;
import java.util.Map;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;

/**
 * @author bratseth
 */
public class MapSectionsToSectionsTestCase extends ExecutionAbstractTestCase {

    @Test
    void testExecution() {
        // Create the page template
        Choice page = Choice.createSingleton(importPage("MapSectionsToSections.xml"));

        // Create a federated result
        Query query = new Query();
        Result result = new Result(query);
        result.hits().add(createHits("source1", 3));
        result.hits().add(createHits("source2", 4));
        result.hits().add(createHits("source3", 5));
        result.hits().add(createHits("source4", 6));
        result.hits().add(createHits("source5", 7));

        // Resolve
        Resolver resolver = new DeterministicResolverAssertingMethod();
        Resolution resolution = resolver.resolve(page, query, result);
        Map<String, List<PageElement>> mapping =
                resolution.getResolution((MapChoice) ((PageTemplate) page.get(0).get(0)).getSection().elements().get(2));
        assertNotNull(mapping);
        assertEquals("box1", ((Section) mapping.get("box1holder").get(0)).getId());
        assertEquals("box2", ((Section) mapping.get("box2holder").get(0)).getId());
        assertEquals("box3", ((Section) mapping.get("box3holder").get(0)).getId());
        assertEquals("box4", ((Section) mapping.get("box4holder").get(0)).getId());

        // Execute
        Organizer organizer = new Organizer();
        organizer.organize(page, resolution, result);

        // Check execution:
        // Two subsections, each containing two sub-subsections with one source each
        assertEquals(2, result.hits().size());
        HitGroup row1 = (HitGroup) result.hits().get(0);
        HitGroup column11 = (HitGroup) row1.get(0);
        HitGroup column12 = (HitGroup) row1.get(1);
        HitGroup row2 = (HitGroup) result.hits().get(1);
        HitGroup column21a = (HitGroup) row2.get(0);
        HitGroup column21b = (HitGroup) row2.get(1);
        HitGroup column22 = (HitGroup) row2.get(2);
        assertEqualHitGroups(createHits("source1", 3), column11);
        assertEqualHitGroups(createHits("source2", 4), column12);
        assertEqualHitGroups(createHits("source3", 5), column21a);
        assertEqualHitGroups(createHits("source5", 7), column21b);
        assertEqualHitGroups(createHits("source4", 6), column22);

        // Check rendering
        assertRendered(result, "MapSectionsToSectionsResult.xml");
    }

    /** Same as deterministic resolver, but asserts that it received the correct method names for each map choice */
    private static class DeterministicResolverAssertingMethod extends DeterministicResolver {

        /** Chooses the last alternative of any choice */
        @Override
        public void resolve(MapChoice mapChoice, Query query, Result result, Resolution resolution) {
            assertEquals("myMethod",mapChoice.getMethod());
            super.resolve(mapChoice,query,result,resolution);
        }

    }

}