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/*******************************************************************************
 * Copyright (C) 2020, exense GmbH
 *  
 * This file is part of STEP
 *  
 * STEP is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *  
 * STEP is distributed in the hope that it will be useful,
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *  
 * You should have received a copy of the GNU Affero General Public License
 * along with STEP.  If not, see .
 ******************************************************************************/
package step.artefacts.handlers;

import java.util.HashMap;
import java.util.List;

import step.artefacts.Sequence;
import step.artefacts.While;
import step.artefacts.reports.WhileReportNode;
import step.core.artefacts.AbstractArtefact;
import step.core.artefacts.handlers.ArtefactHandler;
import step.core.artefacts.reports.ReportNode;
import step.core.artefacts.reports.ReportNodeStatus;
import step.core.dynamicbeans.DynamicValue;
import step.core.dynamicbeans.DynamicValueResolver;

public class WhileHandler extends ArtefactHandler {

	@Override
	protected void createReportSkeleton_(WhileReportNode parentNode, While testArtefact) {
		//stop creating skeleton for while artefact as it may end up in infinite loop
		//evaluateExpressionAndDelegate(parentNode, testArtefact, false);
	}

	@Override
	protected void execute_(WhileReportNode node, While testArtefact) {
		evaluateExpressionAndDelegate(node, testArtefact, true);
	}

	private void evaluateExpressionAndDelegate(WhileReportNode node, While testArtefact, boolean execution) {
		long timeout = testArtefact.getTimeout().getOrDefault(Long.class, 0l);
		long maxTime = System.currentTimeMillis() + timeout;

		Integer maxIterationsValue = testArtefact.getMaxIterations().get();
		int maxIterations = maxIterationsValue==null?0:maxIterationsValue;
		int currIterationsCount = 0;

		int failedLoops = 0;
		
		long pacing = testArtefact.getPacing().getOrDefault(Long.class, 0l);

		List selectedChildren = getChildren(testArtefact);

		DynamicValueResolver resolver = new DynamicValueResolver(context.getExpressionHandler());
		DynamicValue condition = testArtefact.getCondition(); 
		DynamicValue postCondition = testArtefact.getPostCondition();

		try {
			while(reevaluateCondition(resolver, condition) && (condition.get()==null || condition.get()) 														// expression is true
					&& 		  (timeout == 0 || System.currentTimeMillis() < maxTime)	// infinite Timeout or timeout not reached
					&&  (maxIterations == 0 || currIterationsCount < maxIterations)){	// maxIterations infinite or not reached

				if(context.isInterrupted()) {
					break;
				}
				
				Sequence iterationTestCase = createWorkArtefact(Sequence.class, testArtefact, "Iteration_"+currIterationsCount);
				iterationTestCase.setPacing(new DynamicValue(pacing));
				for(AbstractArtefact child:selectedChildren)
					iterationTestCase.addChild(child);

				if(execution) {
					ReportNode iterationReportNode = delegateExecute(iterationTestCase, node, new HashMap<>());

					if(iterationReportNode.getStatus()==ReportNodeStatus.TECHNICAL_ERROR || iterationReportNode.getStatus()==ReportNodeStatus.FAILED) {
						failedLoops++;
					}
				} else {
					delegateCreateReportSkeleton(iterationTestCase, node);
				}
				
				currIterationsCount++;

				reevaluateCondition(resolver, postCondition);
				Boolean postConditionValue = postCondition.get();
				if(postConditionValue != null && !postConditionValue) {
					break;
				}
			}
			
			node.setErrorCount(failedLoops);
			node.setCount(currIterationsCount);
			if(failedLoops>0) {
				node.setStatus(ReportNodeStatus.FAILED);
			} else {
				node.setStatus(ReportNodeStatus.PASSED);
			}
			
		} catch (Throwable e) {
			failWithException(node, e);
		}
	}
	
	protected boolean reevaluateCondition(DynamicValueResolver resolver, DynamicValue condition) {
		resolver.evaluate(condition, getBindings());
		return true;
	}

	@Override
	public WhileReportNode createReportNode_(ReportNode parentNode, While testArtefact) {
		return new WhileReportNode();
	}

}