////////////////////////////////////////////////////////////////////////////////
// checkstyle: Checks Java source code for adherence to a set of rules.
// Copyright (C) 2001-2015 the original author or authors.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////
package edu.cmu.cs.vbc.prog.checkstyle.checks.indentation;

import edu.cmu.cs.vbc.prog.checkstyle.api.DetailAST;
import edu.cmu.cs.vbc.prog.checkstyle.api.TokenTypes;

/**
 * Handler for member definitions.
 *
 * @author o_sukhodolsky
 */
public class MemberDefHandler extends ExpressionHandler
{
    /**
     * Construct an instance of this handler with the given indentation check,
     * abstract syntax tree, and parent handler.
     *
     * @param indentCheck   the indentation check
     * @param ast           the abstract syntax tree
     * @param parent        the parent handler
     */
    public MemberDefHandler(IndentationCheck indentCheck,
        DetailAST ast, ExpressionHandler parent)
    {
        super(indentCheck, "member def", ast, parent);
    }

    @Override
    public void checkIndentation()
    {
        final DetailAST modifiersNode = getMainAst().findFirstToken(TokenTypes.MODIFIERS);
        if (modifiersNode.getChildCount() != 0) {
            checkModifiers();
        }
        else {
            checkType();
        }
        final LineWrappingHandler lineWrap =
            new LineWrappingHandler(getIndentCheck(), getMainAst(),
                getVarDefStatementSemicolon(getMainAst()));
        if (lineWrap.getLastNode() != null && !isArrayDeclaration(getMainAst())) {
            lineWrap.checkIndentation();
        }
    }

    @Override
    public IndentLevel suggestedChildLevel(ExpressionHandler child)
    {
        return getLevel();
    }

    @Override
    protected void checkModifiers()
    {
        final DetailAST modifier = getMainAst().findFirstToken(TokenTypes.MODIFIERS);
        if (startsLine(modifier)
            && !getLevel().accept(expandedTabsColumnNo(modifier)))
        {
            logError(modifier, "modifier", expandedTabsColumnNo(modifier));
        }
    }

    /**
     * Check the indentation of the method type.
     */
    private void checkType()
    {
        final DetailAST type = getMainAst().findFirstToken(TokenTypes.TYPE);
        final DetailAST ident = ExpressionHandler.getFirstToken(type);
        final int columnNo = expandedTabsColumnNo(ident);
        if (startsLine(ident) && !getLevel().accept(columnNo)) {
            logError(ident, "type", columnNo);
        }
    }

    /**
     * Checks if variable_def node is array declaration.
     * @param variableDef current variable_def.
     * @return true if variable_def node is array declaration.
     */
    private boolean isArrayDeclaration(DetailAST variableDef)
    {
        return variableDef.findFirstToken(TokenTypes.TYPE)
            .findFirstToken(TokenTypes.ARRAY_DECLARATOR) != null;
    }

    /**
     * Returns semicolon for variable definition statement.
     * @param variableDef
     *          ast node of type TokenTypes.VARIABLE_DEF
     * @return ast node of type TokenTypes.SEMI
     */
    private static DetailAST getVarDefStatementSemicolon(DetailAST variableDef)
    {
        DetailAST lastNode = variableDef.getLastChild();
        if (lastNode.getType() != TokenTypes.SEMI) {
            lastNode = variableDef.getNextSibling();
        }
        return lastNode;
    }
}
