/*

 * Copyright (C) 2007-2010 Júlio Vilmar Gesser.

 * Copyright (C) 2011, 2013-2021 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.printer;

import java.util.function.Function;

import com.github.javaparser.ast.Node;

import com.github.javaparser.ast.visitor.VoidVisitor;

import com.github.javaparser.printer.configuration.PrinterConfiguration;

import com.github.javaparser.printer.configuration.DefaultPrinterConfiguration;

/**

 * Pretty printer for AST nodes.

 */

public class DefaultPrettyPrinter implements Printer {

    private PrinterConfiguration configuration;

    // visitor factory

    Function<PrinterConfiguration, VoidVisitor<Void>> visitorFactory;

    // static methods 

    private static Function<PrinterConfiguration, VoidVisitor<Void>> createDefaultVisitor() {

        PrinterConfiguration configuration = createDefaultConfiguration();

        return createDefaultVisitor(configuration);

    }

    private static Function<PrinterConfiguration, VoidVisitor<Void>> createDefaultVisitor(PrinterConfiguration configuration) {

        return (config) -> new DefaultPrettyPrinterVisitor(config, new SourcePrinter(config));

    }

    private static PrinterConfiguration createDefaultConfiguration() {

        return new DefaultPrinterConfiguration();

    }

    // Constructors

    /**

     * Build a new DefaultPrettyPrinter with a default configuration and a default factory

     */

    public DefaultPrettyPrinter() {

        this(createDefaultVisitor(), createDefaultConfiguration() );

    }

    /**

     * Build a new DefaultPrettyPrinter with a configuration and a default factory

     * @param configuration

     */

    public DefaultPrettyPrinter(PrinterConfiguration configuration) {

        this(createDefaultVisitor(configuration), configuration );

    }

    /**

     * Build a new DefaultPrettyPrinter with a configuration and a factory to create a visitor to browse the nodes of the AST

     * @param visitorFactory 

     * @param configuration Configuration to apply

     */

    public DefaultPrettyPrinter(Function<PrinterConfiguration, VoidVisitor<Void>> visitorFactory, PrinterConfiguration configuration) {

        this.configuration = configuration;

        this.visitorFactory = visitorFactory;

    }

    // Methods

    /*

     * Returns the Printer configuration

     */

    public PrinterConfiguration getConfiguration() {

        return configuration;

    }

    /*

     * set or update the PrettyPrinter configuration

     */

    public Printer setConfiguration(PrinterConfiguration configuration) {

        this.configuration = configuration;

        return this;

    }

    @Override

    public String print(Node node) {

        // lazy initialization of visitor which can have a state (like a buffer)

        VoidVisitor<Void> visitor = visitorFactory.apply(configuration);

        node.accept(visitor, null);

        return visitor.toString();

    }

}