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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; you may not use this file except in compliance with the Elastic License
 * 2.0.
 */

package org.elasticsearch.xpack.esql.plan.logical;

import org.elasticsearch.xpack.esql.core.expression.Attribute;
import org.elasticsearch.xpack.esql.core.expression.NamedExpression;
import org.elasticsearch.xpack.esql.core.plan.logical.LogicalPlan;
import org.elasticsearch.xpack.esql.core.plan.logical.UnaryPlan;
import org.elasticsearch.xpack.esql.core.tree.NodeInfo;
import org.elasticsearch.xpack.esql.core.tree.Source;

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

public class MvExpand extends UnaryPlan {
    private final NamedExpression target;
    private final Attribute expanded;

    private List output;

    public MvExpand(Source source, LogicalPlan child, NamedExpression target, Attribute expanded) {
        super(source, child);
        this.target = target;
        this.expanded = expanded;
    }

    public static List calculateOutput(List input, NamedExpression target, Attribute expanded) {
        List result = new ArrayList<>();
        for (Attribute attribute : input) {
            if (attribute.name().equals(target.name())) {
                result.add(expanded);
            } else {
                result.add(attribute);
            }
        }
        return result;
    }

    public NamedExpression target() {
        return target;
    }

    public Attribute expanded() {
        return expanded;
    }

    @Override
    public boolean expressionsResolved() {
        return target.resolved();
    }

    @Override
    public UnaryPlan replaceChild(LogicalPlan newChild) {
        return new MvExpand(source(), newChild, target, expanded);
    }

    @Override
    public List output() {
        if (output == null) {
            output = calculateOutput(child().output(), target, expanded);
        }
        return output;
    }

    @Override
    protected NodeInfo info() {
        return NodeInfo.create(this, MvExpand::new, child(), target, expanded);
    }

    @Override
    public int hashCode() {
        return Objects.hash(super.hashCode(), target, expanded);
    }

    @Override
    public boolean equals(Object obj) {
        if (false == super.equals(obj)) {
            return false;
        }
        return Objects.equals(target, ((MvExpand) obj).target) && Objects.equals(expanded, ((MvExpand) obj).expanded);
    }
}