/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the "Elastic License
 * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
 * Public License v 1"; you may not use this file except in compliance with, at
 * your election, the "Elastic License 2.0", the "GNU Affero General Public
 * License v3.0 only", or the "Server Side Public License, v 1".
 */

package org.elasticsearch.action.admin.indices.validate.query;

import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.action.support.DefaultShardOperationFailedException;
import org.elasticsearch.action.support.broadcast.BaseBroadcastResponse;
import org.elasticsearch.common.Strings;
import org.elasticsearch.test.AbstractBroadcastResponseTestCase;
import org.elasticsearch.xcontent.ConstructingObjectParser;
import org.elasticsearch.xcontent.ParseField;
import org.elasticsearch.xcontent.XContentParser;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import static org.elasticsearch.xcontent.ConstructingObjectParser.constructorArg;
import static org.elasticsearch.xcontent.ConstructingObjectParser.optionalConstructorArg;

public class ValidateQueryResponseTests extends AbstractBroadcastResponseTestCase<ValidateQueryResponse> {

    @SuppressWarnings("unchecked")
    private static final ConstructingObjectParser<ValidateQueryResponse, Void> PARSER = new ConstructingObjectParser<>(
        "validate_query",
        true,
        arg -> {
            BaseBroadcastResponse response = (BaseBroadcastResponse) arg[0];
            return new ValidateQueryResponse(
                (boolean) arg[1],
                (List<QueryExplanation>) arg[2],
                response.getTotalShards(),
                response.getSuccessfulShards(),
                response.getFailedShards(),
                Arrays.asList(response.getShardFailures())
            );
        }
    );
    static {
        declareBroadcastFields(PARSER);
        PARSER.declareBoolean(constructorArg(), new ParseField(ValidateQueryResponse.VALID_FIELD));
        PARSER.declareObjectArray(
            optionalConstructorArg(),
            QueryExplanation.PARSER,
            new ParseField(ValidateQueryResponse.EXPLANATIONS_FIELD)
        );
    }

    private static ValidateQueryResponse createRandomValidateQueryResponse(
        int totalShards,
        int successfulShards,
        int failedShards,
        List<DefaultShardOperationFailedException> failures
    ) {
        boolean valid = failedShards == 0;
        List<QueryExplanation> queryExplanations = new ArrayList<>(totalShards);
        for (DefaultShardOperationFailedException failure : failures) {
            queryExplanations.add(new QueryExplanation(failure.index(), failure.shardId(), false, failure.reason(), null));
        }
        return new ValidateQueryResponse(valid, queryExplanations, totalShards, successfulShards, failedShards, failures);
    }

    private static ValidateQueryResponse createRandomValidateQueryResponse() {
        int totalShards = randomIntBetween(1, 10);
        int successfulShards = randomIntBetween(0, totalShards);
        int failedShards = totalShards - successfulShards;
        boolean valid = failedShards == 0;
        List<QueryExplanation> queryExplanations = new ArrayList<>(totalShards);
        List<DefaultShardOperationFailedException> shardFailures = new ArrayList<>(failedShards);
        for (int i = 0; i < successfulShards; i++) {
            QueryExplanation queryExplanation = QueryExplanationTests.createRandomQueryExplanation(true);
            queryExplanations.add(queryExplanation);
        }
        for (int i = 0; i < failedShards; i++) {
            QueryExplanation queryExplanation = QueryExplanationTests.createRandomQueryExplanation(false);
            ElasticsearchException exc = new ElasticsearchException("some_error_" + randomInt());
            shardFailures.add(new DefaultShardOperationFailedException(queryExplanation.getIndex(), queryExplanation.getShard(), exc));
            queryExplanations.add(queryExplanation);
        }
        Collections.shuffle(queryExplanations, random());
        return new ValidateQueryResponse(valid, queryExplanations, totalShards, successfulShards, failedShards, shardFailures);
    }

    @Override
    protected ValidateQueryResponse doParseInstance(XContentParser parser) throws IOException {
        return PARSER.apply(parser, null);
    }

    @Override
    protected ValidateQueryResponse createTestInstance() {
        return createRandomValidateQueryResponse();
    }

    @Override
    protected void assertEqualInstances(ValidateQueryResponse response, ValidateQueryResponse parsedResponse) {
        super.assertEqualInstances(response, parsedResponse);
        Set<QueryExplanation> queryExplSet = new HashSet<>(response.getQueryExplanation());
        assertEquals(response.isValid(), parsedResponse.isValid());
        assertEquals(response.getQueryExplanation().size(), parsedResponse.getQueryExplanation().size());
        assertTrue(queryExplSet.containsAll(parsedResponse.getQueryExplanation()));
    }

    @Override
    protected ValidateQueryResponse createTestInstance(
        int totalShards,
        int successfulShards,
        int failedShards,
        List<DefaultShardOperationFailedException> failures
    ) {
        return createRandomValidateQueryResponse(totalShards, successfulShards, failedShards, failures);
    }

    @Override
    public void testToXContent() {
        ValidateQueryResponse response = createTestInstance(10, 10, 0, new ArrayList<>());
        String output = Strings.toString(response);
        assertEquals("""
            {"_shards":{"total":10,"successful":10,"failed":0},"valid":true}""", output);
    }
}