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 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions
 * and the following disclaimer.
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package org.openjdk.jmc.flightrecorder.internal.parser.v0;

import java.io.IOException;

import org.openjdk.jmc.common.unit.QuantityRange;
import org.openjdk.jmc.flightrecorder.CouldNotLoadRecordingException;
import org.openjdk.jmc.flightrecorder.internal.ChunkInfo;
import org.openjdk.jmc.flightrecorder.internal.IChunkLoader;
import org.openjdk.jmc.flightrecorder.internal.parser.Chunk;
import org.openjdk.jmc.flightrecorder.internal.parser.LoaderContext;

public class ChunkLoaderV0 implements IChunkLoader {
	private final ChunkStructure structure;
	private final byte[] data;
	private final LoaderContext context;
	private final ChunkMetadata metadata;

	private ChunkLoaderV0(ChunkStructure structure, byte[] data, LoaderContext context)
			throws CouldNotLoadRecordingException {
		this.structure = structure;
		this.data = data;
		this.context = context;
		// Read metadata
		metadata = new ChunkMetadata(data, structure.getMetadataOffset());
	}

	@Override
	public byte[] call() throws Exception {
		// Read constants
		ReaderFactory readerFactory = new ReaderFactory(metadata, data, context);

		// Read events
		EventParserManager eventParser = new EventParserManager(readerFactory, context, metadata.getProducers());
		int nextEventIndex = structure.getBodyStartOffset();
		while (nextEventIndex < structure.getMetadataOffset()) {
			Offset offset = new Offset(data, nextEventIndex);
			nextEventIndex = offset.getEnd();
			int eventTypeId = NumberReaders.readInt(data, offset);
			if (eventTypeId == EventParserManager.METADATA_EVENT_TYPE_INDEX
					|| eventTypeId == EventParserManager.CHECK_POINT_EVENT_TYPE_INDEX) {
				// Metadata event || Checkpoint event
			} else {
				// Data event
				eventParser.loadEvent(data, offset, eventTypeId);
			}
		}
		return data;
	}

	public static IChunkLoader create(Chunk input, LoaderContext context)
			throws IOException, CouldNotLoadRecordingException {
		ChunkStructure structure = new ChunkStructure(input);
		byte[] buffer = input.fill(structure.getChunkSize());
		return new ChunkLoaderV0(structure, buffer, context);
	}

	public static ChunkInfo getInfo(Chunk input, long position) throws IOException, CouldNotLoadRecordingException {
		ChunkStructure structure = new ChunkStructure(input);
		byte[] buffer = input.fill(structure.getChunkSize());
		ChunkMetadata metadata = new ChunkMetadata(buffer, structure.getMetadataOffset());
		return new ChunkInfo(position, structure.getChunkSize(),
				QuantityRange.createWithEnd(metadata.getStartTime(), metadata.getEndTime()));
	}

	@Override
	public long getTimestamp() {
		return metadata.getStartTime().longValue();
	}
}
