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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2016-2023 Objectionary.com
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.eolang.opeo.ast;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import lombok.EqualsAndHashCode;
import lombok.ToString;
import org.eolang.jeo.representation.xmir.XmlNode;
import org.eolang.opeo.compilation.Parser;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.xembly.Directive;
import org.xembly.Directives;

/**
 * Access to a field.
 * @since 0.1
 */
@ToString
@EqualsAndHashCode
public final class Field implements Xmir, Typed {

    /**
     * Object reference from which the field is accessed.
     */
    private final AstNode inst;

    /**
     * Field attributes.
     */
    private final Attributes attributes;

    /**
     * Constructor.
     * @param node XMIR root node of the field.
     * @param parser Parser that will be used to parse the child nodes of the field.
     */
    public Field(final XmlNode node, final Parser parser) {
        this(
            parser.parse(node.firstChild()),
            new Attributes(node.children().collect(Collectors.toList()).get(1))
        );
    }

    /**
     * Constructor.
     * @param instance Object reference from which the field is accessed
     * @param attributes Field attributes
     */
    public Field(final AstNode instance, final Attributes attributes) {
        this.inst = instance;
        this.attributes = attributes;
    }

    @Override
    public Iterable toXmir() {
        return new Directives()
            .add("o")
            .attr("base", String.format(".%s", this.attributes.name()))
            .append(this.inst.toXmir())
            .append(this.attributes.toXmir())
            .up();
    }

    @Override
    public Type type() {
        return Type.getType(this.attributes.descriptor());
    }

    /**
     * Store the field opcode. See {@link Opcodes#PUTFIELD}.
     * @param value The value to store.
     * @return Opcode node to store the field. See {@link Opcode}
     */
    List store(final AstNode value) {
        final List res = new ArrayList<>(3);
        res.addAll(this.inst.opcodes());
        res.addAll(value.opcodes());
        res.add(
            new Opcode(
                Opcodes.PUTFIELD,
                this.attributes.owner(),
                this.attributes.name(),
                this.attributes.descriptor()
            )
        );
        return res;
    }

    /**
     * Load the field opcode. See {@link Opcodes#GETFIELD}.
     * @return Opcode node to load the field. See {@link Opcode}
     */
    List load() {
        final List res = new ArrayList<>(2);
        res.addAll(this.inst.opcodes());
        res.add(
            new Opcode(
                Opcodes.GETFIELD,
                this.attributes.owner(),
                this.attributes.name(),
                this.attributes.descriptor()
            )
        );
        return res;
    }
}