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/*
 * The MIT License
 *
 * Copyright 2022 Karate Labs Inc.
 *
 * 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.
 */
package com.intuit.karate.shell;

import com.intuit.karate.FileUtils;
import com.intuit.karate.LogAppender;
import java.io.File;
import java.io.RandomAccessFile;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 * @author pthomas3
 */
public class FileLogAppender implements LogAppender {
    
    private static final Logger LOGGER = LoggerFactory.getLogger(FileLogAppender.class);

    private final RandomAccessFile file;
    private final FileChannel channel;
    private int prevPos;
    private boolean closed;

    public FileLogAppender(File in) {
        try {
            if (in == null) {
                in = File.createTempFile("karate", "tmp");
            } else {
                if (!in.getParentFile().exists()) {
                    in.getParentFile().mkdirs();
                }
            }
            file = new RandomAccessFile(in, "rw");
            channel = file.getChannel();            
            prevPos = (int) channel.position();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    
    private String getBuffer(boolean resetAndClear) {
        try {
            int pos = (int) channel.position();
            ByteBuffer buf = ByteBuffer.allocate(pos - prevPos);
            channel.read(buf, prevPos);
            if (resetAndClear) {
                prevPos = pos;
            }
            ((Buffer) buf).flip(); // java 8 to 9 fix
            return FileUtils.toString(buf.array());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }         
    }

    @Override
    public String getBuffer() {
        return getBuffer(false);
    }   
    
    @Override
    public String collect() {
        return getBuffer(true);
    }

    @Override
    public void append(String text) {
        if (closed) {
            return;
        }
        try {
            channel.write(ByteBuffer.wrap(FileUtils.toBytes(text)));
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void close() {
        try {
            file.close();
            closed = true;
        } catch (Exception e) {
            LOGGER.warn("log appender close failed: {}", e.getMessage());
        }
    }

}