/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.felix.scrplugin.helper;

import java.util.*;

import org.apache.felix.scrplugin.Log;

/**
 * Utility class for handling errors and warnings
 */
public class IssueLog {

    private final boolean strictMode;

    private final List<Entry> errors = new ArrayList<Entry>();

    private final List<Entry> warnings = new ArrayList<Entry>();

    private final List<Entry> deprecationWarnings = new ArrayList<Entry>();

    public IssueLog(final boolean strictMode) {
        this.strictMode = strictMode;
    }

    public int getNumberOfErrors() {
        return this.errors.size();
    }

    public boolean hasErrors() {
        return errors.size() > 0 ||
               (this.strictMode && (warnings.size() > 0 || this.deprecationWarnings.size() > 0));
    }

    public void addError(final String message, final String location, final int lineNumber) {
        errors.add( new Entry( message, location, lineNumber ) );
    }

    public void addWarning(final String message, final String location, final int lineNumber) {
        warnings.add( new Entry( message, location, lineNumber ) );
    }

    public void addDeprecationWarning(final String message, final String location, final int lineNumber) {
        deprecationWarnings.add( new Entry( message, location, lineNumber ) );
    }

    public void logMessages( final Log log )
    {
        // now log warnings and errors (warnings first)
        // in strict mode everything is an error!
        final Iterator<Entry> depWarnings = this.deprecationWarnings.iterator();
        while ( depWarnings.hasNext() )
        {
            final Entry entry = depWarnings.next();
            if ( strictMode )
            {
                log.error( entry.message, entry.location, entry.lineNumber);
            }
            else
            {
                log.warn( entry.message, entry.location, entry.lineNumber);
            }
        }
        if ( this.deprecationWarnings.size() > 0 ) {
            final String msg = "It is highly recommended to fix these problems, as future versions might not " +
             "support these features anymore.";
            if ( strictMode )
            {
                log.error( msg );
            }
            else
            {
                log.warn( msg );
            }
        }

        final Iterator<Entry> warnings = this.warnings.iterator();
        while ( warnings.hasNext() )
        {
            final Entry entry = warnings.next();
            if ( strictMode )
            {
                log.error( entry.message, entry.location, entry.lineNumber);
            }
            else
            {
                log.warn( entry.message, entry.location, entry.lineNumber);
            }
        }

        final Iterator<Entry> errors = this.errors.iterator();
        while ( errors.hasNext() )
        {
            final Entry entry = errors.next();
            log.error( entry.message, entry.location, entry.lineNumber);
        }
    }

    private static class Entry
    {
        final String message;
        final String location;
        final int lineNumber;


        Entry( final String message, final String location, final int lineNumber )
        {
            this.message = message;
            this.location = location;
            this.lineNumber = lineNumber;
        }
    }
}