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/**
 * MIT License (MIT)
 *
 * Copyright (c) 2014 - 2017 Volker Berlin
 *
 * 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,
 * UT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @author Volker Berlin
 * @license: The MIT license 
 */
package com.inet.lib.less;

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

/**
 * A exception that occur if some can not parse or converted.
 */
public class LessException extends RuntimeException {

    private List positions = new ArrayList<>();

    /**
     * Constructs a new less exception with the specified detail message.
     *
     * @param message
     *            the detail message.
     */
    LessException( String message ) {
        super( message );
    }

    /**
     * Constructs a new runtime exception with the specified cause.
     *
     * @param cause
     *            the cause
     */
    LessException( Throwable cause ) {
        super( cause );
    }

    /**
     * Constructs a new runtime exception with the specified detail message and cause.
     *
     * @param message
     *            the detail message.
     * @param cause
     *            the cause
     */
    LessException( String message, Throwable cause ) {
        super( message, cause );
    }

    /**
     * Add a position to the less file stacktrace
     * @param filename the less file, can be null if a string was parsed
     * @param line the line number in the less file
     * @param column the column in the less file
     */
    void addPosition( String filename, int line, int column ) {
        LessFilePosition pos = new LessFilePosition( filename, line, column );
        if( !positions.contains( pos ) ) {
            this.positions.add( pos );
        }
    }

    /**
     * Get the less file stacktrace
     * @return the stack
     */
    public List  getPositions() {
        return new ArrayList<>( positions );
    }

    /**
     * The message without stacktrace.
     * @return the message
     */
    public String getOriginalMessage() {
        return super.getMessage();
    }

    /**
     * The message plus the less file stacktrace.
     * {@inheritDoc}
     */
    @Override
    public String getMessage() {
        StringBuilder builder = new StringBuilder( super.getMessage() );
        for( LessFilePosition pos : positions ) {
            builder.append( "\n\t on line " ).append( pos.getLine() ).append( ", column " ).append( pos.getColumn() );
            if( pos.getFilename() != null ) {
                builder.append( ", file " ).append( pos.getFilename() );
            }
        }
        return builder.toString();
    }
}