/*
 * Copyright 2013-2014 the original author or authors.
 *
 * 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.springframework.batch.core.jsr.job.flow.support.state;

import org.springframework.batch.core.BatchStatus;
import org.springframework.batch.core.ExitStatus;
import org.springframework.batch.core.JobExecution;
import org.springframework.batch.core.StepExecution;
import org.springframework.batch.core.job.flow.FlowExecutionStatus;
import org.springframework.batch.core.job.flow.FlowExecutor;
import org.springframework.batch.core.job.flow.State;
import org.springframework.batch.core.repository.JobRepository;
import org.springframework.batch.item.ExecutionContext;

/**
 * {@link State} implementation for ending a job per JSR-352 rules if it is
 * in progress and continuing if just starting.
 *
 * @author Michael Minella
 * @since 3.0
 */
public class JsrEndState extends org.springframework.batch.core.job.flow.support.state.EndState {

	private JobRepository jobRepository;
	private String restart;

	/**
	 * @param status The {@link FlowExecutionStatus} to end with
	 * @param name The name of the state
	 */
	public JsrEndState(FlowExecutionStatus status, String name) {
		super(status, status.getName(), name);
	}

	/**
	 * @param status The {@link FlowExecutionStatus} to end with
	 * @param name The name of the state
	 */
	public JsrEndState(FlowExecutionStatus status, String code, String name) {
		super(status, code, name, false);
	}

	/**
	 * @param status The {@link FlowExecutionStatus} to end with
	 * @param name The name of the state
	 * @param abandon flag to indicate that previous step execution can be
	 * marked as abandoned (if there is one)
	 *
	 */
	public JsrEndState(FlowExecutionStatus status, String code, String name, boolean abandon) {
		super(status, code, name, abandon);
	}

	public JsrEndState(FlowExecutionStatus status, String code, String name, String restart, boolean abandon, JobRepository jobRepository) {
		super(status, code, name, abandon);
		this.jobRepository = jobRepository;
		this.restart = restart;
	}

	@Override
	public FlowExecutionStatus handle(FlowExecutor executor)
			throws Exception {
		synchronized (executor) {

			// Special case. If the last step execution could not complete we
			// are in an unknown state (possibly unrecoverable).
			StepExecution stepExecution = executor.getStepExecution();
			if (stepExecution != null && executor.getStepExecution().getStatus() == BatchStatus.UNKNOWN) {
				return FlowExecutionStatus.UNKNOWN;
			}

			if (getStatus().isStop()) {
				JobExecution jobExecution = stepExecution.getJobExecution();
				ExecutionContext executionContext = jobExecution.getExecutionContext();
				executionContext.put("batch.restartStep", restart);
				executionContext.put("batch.stoppedStep", stepExecution.getStepName());
				jobRepository.updateExecutionContext(jobExecution);

				if (!executor.isRestart()) {
					/*
					 * If there are step executions, then we are not at the
					 * beginning of a restart.
					 */
					if (isAbandon()) {
						/*
						 * Only if instructed to do so, upgrade the status of
						 * last step execution so it is not replayed on a
						 * restart...
						 */
						executor.abandonStepExecution();
					}
				}
				else {
					/*
					 * If we are a stop state and we got this far then it must
					 * be a restart, so return COMPLETED.
					 */
					return FlowExecutionStatus.COMPLETED;
				}
			}

			setExitStatus(executor, getCode());

			return getStatus();
		}
	}

	/* (non-Javadoc)
	 * @see org.springframework.batch.core.job.flow.support.state.EndState#setExitStatus(org.springframework.batch.core.job.flow.FlowExecutor, java.lang.String)
	 */
	@Override
	protected void setExitStatus(FlowExecutor executor, String code) {
		StepExecution stepExecution = executor.getStepExecution();

		ExitStatus status = new ExitStatus(code);
		if(!ExitStatus.isNonDefaultExitStatus(status)) {
			stepExecution.getJobExecution().setExitStatus(status);
		}
	}
}