/*
 * Copyright 2015-2017 OpenCB
 *
 * Licensed 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.opencb.opencga.storage.core.variant.transform;

import org.opencb.commons.utils.FileUtils;

import java.io.*;
import java.nio.file.Path;
import java.util.function.Supplier;

/**
 * Created on 02/08/16.
 *
 * @author Jacobo Coll &lt;jacobo167@gmail.com&gt;
 */
public class MalformedVariantHandler implements VariantTransformTask.ErrorHandler {

    private Supplier<OutputStream> supplier;
    private PrintStream out;
    private long counter = 0;

    public MalformedVariantHandler(Path outputFile) throws IOException {
        FileUtils.checkDirectory(outputFile.toAbsolutePath().getParent(), true);
        supplier = () -> {
            try {
                return new FileOutputStream(outputFile.toFile());
            } catch (FileNotFoundException e) {
                // This should not happen. Permissions already checked at creation.
                // May have changes?
                throw new UncheckedIOException(e);
            }
        };
    }

    public MalformedVariantHandler(Supplier<OutputStream> supplier) throws IOException {
        this.supplier = supplier;
    }

    @Override
    public synchronized void accept(int lineNo, String line, RuntimeException exception) {
        counter++;

        if (out == null) {
            // Only create file if required
            out = new PrintStream(supplier.get());
        }

        out.print("ERROR (" + exception.getClass().getSimpleName() + ") at line #" + lineNo + " >>>>\t");
        out.println(line);
        exception.printStackTrace(out);

        out.flush();
    }

    public void close() {
        if (out != null) {
            out.close();
        }
    }

    public long getMalformedLines() {
        return counter;
    }
}
