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/*
 * Copyright (C) 2007-2010 Júlio Vilmar Gesser.
 * Copyright (C) 2011, 2013-2023 The JavaParser Team.
 *
 * This file is part of JavaParser.
 *
 * JavaParser can be used either under the terms of
 * a) the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * b) the terms of the Apache License
 *
 * You should have received a copy of both licenses in LICENCE.LGPL and
 * LICENCE.APACHE. Please refer to those files for details.
 *
 * JavaParser is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 */
package com.github.javaparser.ast.expr;

import com.github.javaparser.TokenRange;
import com.github.javaparser.ast.AllFieldsConstructor;
import com.github.javaparser.ast.Generated;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.nodeTypes.NodeWithExpression;
import com.github.javaparser.ast.observer.ObservableProperty;
import com.github.javaparser.ast.visitor.CloneVisitor;
import com.github.javaparser.ast.visitor.GenericVisitor;
import com.github.javaparser.ast.visitor.VoidVisitor;
import com.github.javaparser.metamodel.DerivedProperty;
import com.github.javaparser.metamodel.JavaParserMetaModel;
import com.github.javaparser.metamodel.UnaryExprMetaModel;
import com.github.javaparser.printer.Stringable;

import java.util.Optional;
import java.util.function.Consumer;

import static com.github.javaparser.utils.Utils.assertNotNull;

/**
 * An expression where an operator is applied to a single expression.
 * It supports the operators that are found in the UnaryExpr.Operator enum.
 * 
{@code 11++}
 * 
{@code ++11}
 * 
{@code ~1}
 * 
{@code -333}
 *
 * @author Julio Vilmar Gesser
 */
public class UnaryExpr extends Expression implements NodeWithExpression {

    public enum Operator implements Stringable {

        PLUS("+", false),
        MINUS("-", false),
        PREFIX_INCREMENT("++", false),
        PREFIX_DECREMENT("--", false),
        LOGICAL_COMPLEMENT("!", false),
        BITWISE_COMPLEMENT("~", false),
        POSTFIX_INCREMENT("++", true),
        POSTFIX_DECREMENT("--", true);

        private final String codeRepresentation;

        private final boolean isPostfix;

        Operator(String codeRepresentation, boolean isPostfix) {
            this.codeRepresentation = codeRepresentation;
            this.isPostfix = isPostfix;
        }

        public String asString() {
            return codeRepresentation;
        }

        public boolean isPostfix() {
            return isPostfix;
        }

        public boolean isPrefix() {
            return !isPostfix();
        }
    }

    private Expression expression;

    private Operator operator;

    public UnaryExpr() {
        this(null, new IntegerLiteralExpr(), Operator.POSTFIX_INCREMENT);
    }

    @AllFieldsConstructor
    public UnaryExpr(final Expression expression, final Operator operator) {
        this(null, expression, operator);
    }

    /**
     * This constructor is used by the parser and is considered private.
     */
    @Generated("com.github.javaparser.generator.core.node.MainConstructorGenerator")
    public UnaryExpr(TokenRange tokenRange, Expression expression, Operator operator) {
        super(tokenRange);
        setExpression(expression);
        setOperator(operator);
        customInitialization();
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.AcceptGenerator")
    public  R accept(final GenericVisitor v, final A arg) {
        return v.visit(this, arg);
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.AcceptGenerator")
    public  void accept(final VoidVisitor v, final A arg) {
        v.visit(this, arg);
    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public Expression getExpression() {
        return expression;
    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public Operator getOperator() {
        return operator;
    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public UnaryExpr setExpression(final Expression expression) {
        assertNotNull(expression);
        if (expression == this.expression) {
            return this;
        }
        notifyPropertyChange(ObservableProperty.EXPRESSION, this.expression, expression);
        if (this.expression != null)
            this.expression.setParentNode(null);
        this.expression = expression;
        setAsParentNodeOf(expression);
        return this;
    }

    @Generated("com.github.javaparser.generator.core.node.PropertyGenerator")
    public UnaryExpr setOperator(final Operator operator) {
        assertNotNull(operator);
        if (operator == this.operator) {
            return this;
        }
        notifyPropertyChange(ObservableProperty.OPERATOR, this.operator, operator);
        this.operator = operator;
        return this;
    }

    @DerivedProperty
    public boolean isPostfix() {
        return operator.isPostfix();
    }

    @DerivedProperty
    public boolean isPrefix() {
        return !isPostfix();
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.CloneGenerator")
    public UnaryExpr clone() {
        return (UnaryExpr) accept(new CloneVisitor(), null);
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.GetMetaModelGenerator")
    public UnaryExprMetaModel getMetaModel() {
        return JavaParserMetaModel.unaryExprMetaModel;
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.ReplaceMethodGenerator")
    public boolean replace(Node node, Node replacementNode) {
        if (node == null) {
            return false;
        }
        if (node == expression) {
            setExpression((Expression) replacementNode);
            return true;
        }
        return super.replace(node, replacementNode);
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public boolean isUnaryExpr() {
        return true;
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public UnaryExpr asUnaryExpr() {
        return this;
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public void ifUnaryExpr(Consumer action) {
        action.accept(this);
    }

    @Override
    @Generated("com.github.javaparser.generator.core.node.TypeCastingGenerator")
    public Optional toUnaryExpr() {
        return Optional.of(this);
    }
}
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