package backtype.storm.testing;

import backtype.storm.spout.SpoutOutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.IRichSpout;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Fields;
import backtype.storm.utils.Utils;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import static backtype.storm.utils.Utils.get;

public class FixedTupleSpout implements IRichSpout {
	private static final Map<String, Integer> acked = new HashMap<String, Integer>();
	private static final Map<String, Integer> failed = new HashMap<String, Integer>();

	public static int getNumAcked(String stormId) {
		synchronized (acked) {
			return get(acked, stormId, 0);
		}
	}

	public static int getNumFailed(String stormId) {
		synchronized (failed) {
			return get(failed, stormId, 0);
		}
	}

	public static void clear(String stormId) {
		acked.remove(stormId);
		failed.remove(stormId);
	}

	private List<FixedTuple> _tuples;
	private SpoutOutputCollector _collector;

	private TopologyContext _context;
	private List<FixedTuple> _serveTuples;
	private Map<String, FixedTuple> _pending;

	private String _id;
	private String _fieldName;

	public FixedTupleSpout(List tuples) {
		this(tuples, null);
	}

	public FixedTupleSpout(List tuples, String fieldName) {
		_id = UUID.randomUUID().toString();
		synchronized (acked) {
			acked.put(_id, 0);
		}
		synchronized (failed) {
			failed.put(_id, 0);
		}
		_tuples = new ArrayList<FixedTuple>();
		for (Object o : tuples) {
			FixedTuple ft;
			if (o instanceof FixedTuple) {
				ft = (FixedTuple) o;
			} else {
				ft = new FixedTuple((List) o);
			}
			_tuples.add(ft);
		}
		_fieldName = fieldName;
	}

	public List<FixedTuple> getSourceTuples() {
		return _tuples;
	}

	public int getCompleted() {
		int ackedAmt;
		int failedAmt;

		synchronized (acked) {
			ackedAmt = acked.get(_id);
		}
		synchronized (failed) {
			failedAmt = failed.get(_id);
		}
		return ackedAmt + failedAmt;
	}

	public void cleanup() {
		synchronized (acked) {
			acked.remove(_id);
		}
		synchronized (failed) {
			failed.remove(_id);
		}
	}

	public void open(Map conf, TopologyContext context,
			SpoutOutputCollector collector) {
		_context = context;
		List<Integer> tasks = context.getComponentTasks(context
				.getThisComponentId());
		int startIndex;
		for (startIndex = 0; startIndex < tasks.size(); startIndex++) {
			if (tasks.get(startIndex) == context.getThisTaskId()) {
				break;
			}
		}
		_collector = collector;
		_pending = new HashMap<String, FixedTuple>();
		_serveTuples = new ArrayList<FixedTuple>();
		for (int i = startIndex; i < _tuples.size(); i += tasks.size()) {
			_serveTuples.add(_tuples.get(i));
		}
	}

	public void close() {
	}

	public void nextTuple() {
		if (_serveTuples.size() > 0) {
			FixedTuple ft = _serveTuples.remove(0);
			String id = UUID.randomUUID().toString();
			_pending.put(id, ft);
			_collector.emit(ft.stream, ft.values, id);
		} else {
			Utils.sleep(100);
		}
	}

	public void ack(Object msgId) {
		synchronized (acked) {
			int curr = get(acked, _id, 0);
			acked.put(_id, curr + 1);
		}
	}

	public void fail(Object msgId) {
		synchronized (failed) {
			int curr = get(failed, _id, 0);
			failed.put(_id, curr + 1);
		}
	}

	@Override
	public void activate() {
	}

	@Override
	public void deactivate() {
	}

	@Override
	public void declareOutputFields(OutputFieldsDeclarer declarer) {
		if (_fieldName != null) {
			declarer.declare(new Fields(_fieldName));
		}
	}

	@Override
	public Map<String, Object> getComponentConfiguration() {
		return null;
	}
}