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/*
 * 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 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 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.client.transform;

import org.elasticsearch.client.transform.transforms.TransformConfig;
import org.elasticsearch.core.Nullable;
import org.elasticsearch.xcontent.ConstructingObjectParser;
import org.elasticsearch.xcontent.ParseField;
import org.elasticsearch.xcontent.XContentParser;

import java.util.List;
import java.util.Objects;

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

public class GetTransformResponse {

    public static final ParseField TRANSFORMS = new ParseField("transforms");
    public static final ParseField INVALID_TRANSFORMS = new ParseField("invalid_transforms");
    public static final ParseField COUNT = new ParseField("count");

    @SuppressWarnings("unchecked")
    static final ConstructingObjectParser INVALID_TRANSFORMS_PARSER = new ConstructingObjectParser<>(
        "invalid_transforms",
        true,
        args -> new InvalidTransforms((List) args[0])
    );

    @SuppressWarnings("unchecked")
    static final ConstructingObjectParser PARSER = new ConstructingObjectParser<>(
        "get_transform",
        true,
        args -> new GetTransformResponse((List) args[0], (long) args[1], (InvalidTransforms) args[2])
    );
    static {
        // Discard the count field which is the size of the transforms array
        INVALID_TRANSFORMS_PARSER.declareLong((a, b) -> {}, COUNT);
        INVALID_TRANSFORMS_PARSER.declareStringArray(constructorArg(), TRANSFORMS);

        PARSER.declareObjectArray(constructorArg(), TransformConfig.PARSER::apply, TRANSFORMS);
        PARSER.declareLong(constructorArg(), COUNT);
        PARSER.declareObject(optionalConstructorArg(), INVALID_TRANSFORMS_PARSER::apply, INVALID_TRANSFORMS);
    }

    public static GetTransformResponse fromXContent(final XContentParser parser) {
        return GetTransformResponse.PARSER.apply(parser, null);
    }

    private List transformConfigurations;
    private long count;
    private InvalidTransforms invalidTransforms;

    public GetTransformResponse(List transformConfigurations, long count, @Nullable InvalidTransforms invalidTransforms) {
        this.transformConfigurations = transformConfigurations;
        this.count = count;
        this.invalidTransforms = invalidTransforms;
    }

    @Nullable
    public InvalidTransforms getInvalidTransforms() {
        return invalidTransforms;
    }

    public long getCount() {
        return count;
    }

    public List getTransformConfigurations() {
        return transformConfigurations;
    }

    @Override
    public int hashCode() {
        return Objects.hash(transformConfigurations, count, invalidTransforms);
    }

    @Override
    public boolean equals(Object other) {
        if (this == other) {
            return true;
        }

        if (other == null || getClass() != other.getClass()) {
            return false;
        }

        final GetTransformResponse that = (GetTransformResponse) other;
        return Objects.equals(this.transformConfigurations, that.transformConfigurations)
            && Objects.equals(this.count, that.count)
            && Objects.equals(this.invalidTransforms, that.invalidTransforms);
    }

    static class InvalidTransforms {
        private final List transformIds;

        InvalidTransforms(List transformIds) {
            this.transformIds = transformIds;
        }

        public long getCount() {
            return transformIds.size();
        }

        public List getTransformIds() {
            return transformIds;
        }

        @Override
        public int hashCode() {
            return Objects.hash(transformIds);
        }

        @Override
        public boolean equals(Object other) {
            if (this == other) {
                return true;
            }

            if (other == null || getClass() != other.getClass()) {
                return false;
            }

            final InvalidTransforms that = (InvalidTransforms) other;
            return Objects.equals(this.transformIds, that.transformIds);
        }
    }
}