/*
 * Copyright (c) 2010-2013 Evolveum
 *
 * 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 com.evolveum.midpoint.task.quartzimpl.handlers;

import java.util.List;

import com.evolveum.midpoint.prism.PrismObject;
import com.evolveum.midpoint.schema.result.OperationResult;
import com.evolveum.midpoint.task.api.Task;
import com.evolveum.midpoint.task.api.TaskHandler;
import com.evolveum.midpoint.task.api.TaskManager;
import com.evolveum.midpoint.task.api.TaskRunResult;
import com.evolveum.midpoint.task.api.TaskRunResult.TaskRunResultStatus;
import com.evolveum.midpoint.task.quartzimpl.TaskManagerQuartzImpl;
import com.evolveum.midpoint.task.quartzimpl.TaskQuartzImpl;
import com.evolveum.midpoint.util.exception.SchemaException;
import com.evolveum.midpoint.util.exception.SystemException;
import com.evolveum.midpoint.util.logging.Trace;
import com.evolveum.midpoint.util.logging.TraceManager;
import com.evolveum.midpoint.xml.ns._public.common.common_3.TaskExecutionStatusType;
import com.evolveum.midpoint.xml.ns._public.common.common_3.TaskType;

/**
 * @author Pavol Mederly
 *
 */
@Deprecated
public class WaitForSubtasksByPollingTaskHandler implements TaskHandler {

	private static final transient Trace LOGGER = TraceManager.getTrace(WaitForSubtasksByPollingTaskHandler.class);
	public static final String HANDLER_URI = "http://midpoint.evolveum.com/xml/ns/public/task/wait-for-subtasks-polling/handler-3";

	private static WaitForSubtasksByPollingTaskHandler instance = null;
	private TaskManagerQuartzImpl taskManagerImpl;

	private WaitForSubtasksByPollingTaskHandler() {}
	
	public static void instantiateAndRegister(TaskManager taskManager) {
		if (instance == null)
			instance = new WaitForSubtasksByPollingTaskHandler();
		taskManager.registerHandler(HANDLER_URI, instance);
		instance.taskManagerImpl = (TaskManagerQuartzImpl) taskManager;
	}

	@Override
	public TaskRunResult run(Task task) {

		OperationResult opResult = new OperationResult(WaitForSubtasksByPollingTaskHandler.class.getName()+".run");
		TaskRunResult runResult = new TaskRunResult();

        LOGGER.info("WaitForSubtasksByPollingTaskHandler run starting; in task " + task.getName());

        List<PrismObject<TaskType>> subtasks = null;
        try {
            subtasks = ((TaskQuartzImpl) task).listSubtasksRaw(opResult);
        } catch (SchemaException e) {
            throw new SystemException("Couldn't list subtasks of " + task + " due to schema exception", e);
        }

        LOGGER.info("Number of subtasks found: " + subtasks.size() + "; task = {}", task);
        boolean allClosed = true;
        for (PrismObject<TaskType> t : subtasks) {
            if (t.asObjectable().getExecutionStatus() != TaskExecutionStatusType.CLOSED) {
                LOGGER.info("Subtask " + t.getOid() + "/" + t.asObjectable().getName() + " is not closed, it is " + t.asObjectable().getExecutionStatus() + ", for task {}", task);
                allClosed = false;
                break;
            }
        }

        TaskRunResultStatus status;
        if (allClosed) {
            LOGGER.info("All subtasks are closed, finishing waiting for them; task = {}", task);
            status = TaskRunResultStatus.FINISHED_HANDLER;
        } else {
            status = TaskRunResultStatus.FINISHED;
        }

        runResult.setOperationResult(null);                             // not to overwrite task's result
        runResult.setProgress(task.getProgress());                      // not to overwrite task's progress
        runResult.setRunResultStatus(status);
		LOGGER.info("WaitForSubtasksByPollingTaskHandler run finishing; in task " + task.getName());
		return runResult;
	}

	@Override
	public Long heartbeat(Task task) {
		return null;		// not to overwrite progress information!
	}

	@Override
	public void refreshStatus(Task task) {
	}

    @Override
    public String getCategoryName(Task task) {
        return null;        // hopefully we will never need to derive category from this handler! (category is filled-in when persisting tasks)
    }

    @Override
    public List<String> getCategoryNames() {
        return null;
    }
}