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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.ml.job.stats;

import org.elasticsearch.xcontent.ConstructingObjectParser;
import org.elasticsearch.xcontent.ParseField;
import org.elasticsearch.xcontent.ToXContentObject;
import org.elasticsearch.xcontent.XContentBuilder;

import java.io.IOException;
import java.util.Objects;

/**
 * Helper class for min, max, avg and total statistics for a quantity
 */
public class SimpleStats implements ToXContentObject {

    public static final ParseField MIN = new ParseField("min");
    public static final ParseField MAX = new ParseField("max");
    public static final ParseField AVG = new ParseField("avg");
    public static final ParseField TOTAL = new ParseField("total");

    public static final ConstructingObjectParser PARSER = new ConstructingObjectParser<>("simple_stats", true, (a) -> {
        int i = 0;
        double total = (double) a[i++];
        double min = (double) a[i++];
        double max = (double) a[i++];
        double avg = (double) a[i++];
        return new SimpleStats(total, min, max, avg);
    });

    static {
        PARSER.declareDouble(ConstructingObjectParser.constructorArg(), TOTAL);
        PARSER.declareDouble(ConstructingObjectParser.constructorArg(), MIN);
        PARSER.declareDouble(ConstructingObjectParser.constructorArg(), MAX);
        PARSER.declareDouble(ConstructingObjectParser.constructorArg(), AVG);
    }

    private final double total;
    private final double min;
    private final double max;
    private final double avg;

    SimpleStats(double total, double min, double max, double avg) {
        this.total = total;
        this.min = min;
        this.max = max;
        this.avg = avg;
    }

    public double getMin() {
        return min;
    }

    public double getMax() {
        return max;
    }

    public double getAvg() {
        return avg;
    }

    public double getTotal() {
        return total;
    }

    @Override
    public int hashCode() {
        return Objects.hash(total, min, max, avg);
    }

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

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

        SimpleStats other = (SimpleStats) obj;
        return Objects.equals(total, other.total)
            && Objects.equals(min, other.min)
            && Objects.equals(avg, other.avg)
            && Objects.equals(max, other.max);
    }

    @Override
    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
        builder.startObject();
        builder.field(MIN.getPreferredName(), min);
        builder.field(MAX.getPreferredName(), max);
        builder.field(AVG.getPreferredName(), avg);
        builder.field(TOTAL.getPreferredName(), total);
        builder.endObject();
        return builder;
    }
}