/**
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions and the
 *    following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. The name "Exolab" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of Intalio, Inc.  For written permission,
 *    please contact info@codehaus.org.
 *
 * 4. Products derived from this Software may not be called "Exolab"
 *    nor may "Exolab" appear in their names without prior written
 *    permission of Intalio, Inc. Exolab is a registered
 *    trademark of Intalio, Inc.
 *
 * 5. Due credit should be given to the Exolab Project
 *    (http://www.codehaus.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * INTALIO, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 1999-2001 (C) Intalio, Inc. All Rights Reserved.
 *
 * $Id$
 */
package org.codehaus.modello.plugin.java.javasource;

/*
 * Copyright (c) 2004, Codehaus.org
 *
 * 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 NONINFRINGEMENT. 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.
 */

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

import org.codehaus.modello.ModelloRuntimeException;

/**
 * A class for holding in-memory Java source code.
 *
 * @author <a href="mailto:kvisco@intalio.com">Keith Visco</a>
 * @version $Revision$ $Date$
 **/
public class JSourceCode {

    /**
     * A list of JCodeStatements
     **/
    private List<JCodeStatement> source = null;

    /**
     * The indent size
     **/
    private short indentSize = 4;

    /**
     * The current indent size
     **/
    private short currentIndent = indentSize;

    /**
     * Creates an empty JSourceCode
     **/
    public JSourceCode() {
        super();
        source = new ArrayList<JCodeStatement>();
    } // -- JSourceCode

    /**
     * Creates a JSourceCode and adds the given String
     * to it's contents
     * @param sourceCode the source to add
     **/
    public JSourceCode(String sourceCode) {
        this();
        this.source.add(new JCodeStatement(sourceCode, currentIndent));
    } // -- JSourceCode

    /**
     * Adds the given statement to this JSourceCode. The statement
     * will be added on a new line.
     * @param statement the statement to add
     **/
    public void add(String statement) {
        JCodeStatement jcs = new JCodeStatement(statement, currentIndent);
        source.add(jcs);
    } // -- add

    /**
     * Adds the given statement to this JSourceCode. The statement
     * will be added on a new line.
     * @param statement the statement to add
     * @param indentSize the indentSize is the size of the indentation to use
     * when printing this JSourceCode
     * @see #print
     * @deprecated this method is not here any mode in castor codegen 1.3rc1
     **/
    public void add(String statement, short indentSize) {
        JCodeStatement jcs = new JCodeStatement(statement, indentSize);
        source.add(jcs);
    } // -- add

    /**
     * Adds the given statement to this JSourceCode. The statement
     * will be added on a new line and added with increased indent.
     * This is a convenience method for the sequence
     * <code>
     * indent();
     * add(statement);
     * unindent();
     * </code>
     * @param statement the statement to add
     **/
    public void addIndented(String statement) {
        indent();
        JCodeStatement jcs = new JCodeStatement(statement, currentIndent);
        source.add(jcs);
        unindent();
    } // -- add

    /**
     * Appends the given String to the last line in this
     * JSourceCode
     * @param segment the String to append
     **/
    public void append(String segment) {

        if (source.isEmpty()) add(segment);
        else {
            JCodeStatement jcs = (JCodeStatement) source.get(source.size() - 1);
            jcs.append(segment);
        }
    } // -- append(String)

    /**
     * Clears all the code statements from this JSourceCode
     **/
    public void clear() {
        source.clear();
    } // -- clear();

    /**
     * Copies the contents of this JSourceCode into the given JSourceCode
     * @param jsc the JSourceCode to copy this JSourceCode into
     **/
    public void copyInto(JSourceCode jsc) {
        for (int i = 0; i < source.size(); i++) {
            jsc.addCodeStatement(source.get(i));
        }
    } // -- copyInto

    /**
     * Increases the current indent level by 1
     **/
    public void indent() {
        currentIndent += indentSize;
    } // -- indent();

    /**
     * Returns true if this JSourceCode is empty (ie. no source).
     * @return true if this JSourceCode is empty.
     **/
    public boolean isEmpty() {
        return source.isEmpty();
    } // -- isEmpty

    /**
     * Prints this JSourceCode to the given JSourceWriter
     * @param jsw the JSourceWriter to print to
     **/
    public void print(JSourceWriter jsw) {
        for (int i = 0; i < source.size(); i++) jsw.writeln(source.get(i).toString());
    } // -- print

    /**
     * Decreases the indent level by 1
     **/
    public void unindent() {
        if (currentIndent == 0) {
            throw new ModelloRuntimeException("Cannot unindent: current indent is 0.");
        }
        currentIndent -= indentSize;
    } // -- unindent

    /**
     * Returns the String representation of this JSourceCode
     * @return the String representation of this JSourceCode
     **/
    public String toString() {
        StringBuilder sb = new StringBuilder();
        String lineSeparator = System.getProperty("line.separator");
        for (int i = 0; i < source.size(); i++) {
            sb.append(source.get(i).toString());
            sb.append(lineSeparator);
        }
        return sb.toString();
    } // -- toString

    /**
     * Adds the given JCodeStatement to this JSourceCode
     * @param jcs the JCodeStatement to add
     **/
    private void addCodeStatement(JCodeStatement jcs) {
        short indent = (short) (jcs.getIndent() + currentIndent - JCodeStatement.DEFAULT_INDENTSIZE);
        source.add(new JCodeStatement(jcs.getStatement(), indent));
    } // -- addCodeStatement(JCodeStatement)
} // -- JSourceCode

/**
 * Represents a line of code, used by JSourceCode class
 * @author <a href="kvisco@intalio.com">Keith Visco</a>
 **/
class JCodeStatement {

    private StringBuilder value = null;
    public static short DEFAULT_INDENTSIZE = 4;
    private short indentSize = DEFAULT_INDENTSIZE;

    JCodeStatement() {
        super();
        value = new StringBuilder();
    } // -- JCodeStatement

    JCodeStatement(String statement) {
        this();
        this.value.append(statement);
    } // -- JCodeStatement

    JCodeStatement(String statement, short indentSize) {
        this(statement);
        this.indentSize = indentSize;
    } // -- JCodeStatement

    void append(String segment) {
        value.append(segment);
    }

    short getIndent() {
        return indentSize;
    } // -- getIndent

    String getStatement() {
        return value.toString();
    } // -- getStatement

    public String toString() {
        if (value.length() == 0) {
            return "";
        }

        StringBuilder sb = new StringBuilder(indentSize + value.length());
        for (int i = 0; i < indentSize; i++) sb.append(' ');
        sb.append(value.toString());
        return sb.toString();
    }
} // -- JCodeStatement
