package azkaban.test.execapp;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;

import org.apache.commons.io.FileUtils;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import azkaban.execapp.FlowRunner;
import azkaban.execapp.event.Event;
import azkaban.execapp.event.Event.Type;
import azkaban.executor.ExecutableFlow;
import azkaban.executor.ExecutableNode;
import azkaban.executor.ExecutionOptions.FailureAction;
import azkaban.executor.ExecutorLoader;
import azkaban.executor.Status;

import azkaban.flow.Flow;
import azkaban.jobtype.JobTypeManager;
import azkaban.project.ProjectLoader;
import azkaban.test.executor.JavaJob;
import azkaban.utils.JSONUtils;

public class FlowRunnerTest {
	private File workingDir;
	private JobTypeManager jobtypeManager;
	private ProjectLoader fakeProjectLoader;
	public FlowRunnerTest() {
		
	}
	
	@Before
	public void setUp() throws Exception {
		System.out.println("Create temp dir");
		workingDir = new File("_AzkabanTestDir_" + System.currentTimeMillis());
		if (workingDir.exists()) {
			FileUtils.deleteDirectory(workingDir);
		}
		workingDir.mkdirs();
		jobtypeManager = new JobTypeManager(null, this.getClass().getClassLoader());
		jobtypeManager.registerJobType("java", JavaJob.class);
		fakeProjectLoader = new MockProjectLoader(workingDir);
	}
	
	@After
	public void tearDown() throws IOException {
		System.out.println("Teardown temp dir");
		if (workingDir != null) {
			FileUtils.deleteDirectory(workingDir);
			workingDir = null;
		}
	}
	
	@Test
	public void exec1Normal() throws Exception {
		MockExecutorLoader loader = new MockExecutorLoader();
		//just making compile. may not work at all.
		
		EventCollectorListener eventCollector = new EventCollectorListener();
		eventCollector.setEventFilterOut(Event.Type.JOB_FINISHED, Event.Type.JOB_STARTED, Event.Type.JOB_STATUS_CHANGED);
		FlowRunner runner = createFlowRunner(loader, eventCollector, "exec1");
		
		Assert.assertTrue(!runner.isCancelled());
		runner.run();
		ExecutableFlow exFlow = runner.getExecutableFlow();
		Assert.assertTrue(exFlow.getStatus() == Status.SUCCEEDED);
		compareFinishedRuntime(runner);
		
		testStatus(exFlow, "job1", Status.SUCCEEDED);
		testStatus(exFlow, "job2", Status.SUCCEEDED);
		testStatus(exFlow, "job3", Status.SUCCEEDED);
		testStatus(exFlow, "job4", Status.SUCCEEDED);
		testStatus(exFlow, "job5", Status.SUCCEEDED);
		testStatus(exFlow, "job6", Status.SUCCEEDED);
		testStatus(exFlow, "job7", Status.SUCCEEDED);
		testStatus(exFlow, "job8", Status.SUCCEEDED);
		testStatus(exFlow, "job10", Status.SUCCEEDED);
		
		try {
			eventCollector.checkEventExists(new Type[] {Type.FLOW_STARTED, Type.FLOW_FINISHED});
		}
		catch (Exception e) {
			System.out.println(e.getMessage());
			
			Assert.fail(e.getMessage());
		}
	}
	
	@Test
	public void exec1Disabled() throws Exception {
		MockExecutorLoader loader = new MockExecutorLoader();
		EventCollectorListener eventCollector = new EventCollectorListener();
		eventCollector.setEventFilterOut(Event.Type.JOB_FINISHED, Event.Type.JOB_STARTED, Event.Type.JOB_STATUS_CHANGED);
		File testDir = new File("unit/executions/exectest1");
		ExecutableFlow exFlow = prepareExecDir(testDir, "exec1", 1);
		
		// Disable couple in the middle and at the end.
		exFlow.getExecutableNode("job1").setStatus(Status.DISABLED);
		exFlow.getExecutableNode("job6").setStatus(Status.DISABLED);
		exFlow.getExecutableNode("job5").setStatus(Status.DISABLED);
		exFlow.getExecutableNode("job10").setStatus(Status.DISABLED);
		
		FlowRunner runner = createFlowRunner(exFlow, loader, eventCollector);

		Assert.assertTrue(!runner.isCancelled());
		Assert.assertTrue(exFlow.getStatus() == Status.READY);
		runner.run();

		exFlow = runner.getExecutableFlow();
		compareFinishedRuntime(runner);
		
		Assert.assertTrue(exFlow.getStatus() == Status.SUCCEEDED);
		
		testStatus(exFlow, "job1", Status.SKIPPED);
		testStatus(exFlow, "job2", Status.SUCCEEDED);
		testStatus(exFlow, "job3", Status.SUCCEEDED);
		testStatus(exFlow, "job4", Status.SUCCEEDED);
		testStatus(exFlow, "job5", Status.SKIPPED);
		testStatus(exFlow, "job6", Status.SKIPPED);
		testStatus(exFlow, "job7", Status.SUCCEEDED);
		testStatus(exFlow, "job8", Status.SUCCEEDED);
		testStatus(exFlow, "job10", Status.SKIPPED);
		
		try {
			eventCollector.checkEventExists(new Type[] {Type.FLOW_STARTED, Type.FLOW_FINISHED});
		}
		catch (Exception e) {
			System.out.println(e.getMessage());
			
			Assert.fail(e.getMessage());
		}
	}
	
	@Test
	public void exec1Failed() throws Exception {
		MockExecutorLoader loader = new MockExecutorLoader();
		EventCollectorListener eventCollector = new EventCollectorListener();
		eventCollector.setEventFilterOut(Event.Type.JOB_FINISHED, Event.Type.JOB_STARTED, Event.Type.JOB_STATUS_CHANGED);
		File testDir = new File("unit/executions/exectest1");
		ExecutableFlow flow = prepareExecDir(testDir, "exec2", 1);
		
		FlowRunner runner = createFlowRunner(flow, loader, eventCollector);
		
		runner.run();
		ExecutableFlow exFlow = runner.getExecutableFlow();
		Assert.assertTrue(!runner.isCancelled());
		Assert.assertTrue("Flow status " + exFlow.getStatus(), exFlow.getStatus() == Status.FAILED);
		
		testStatus(exFlow, "job1", Status.SUCCEEDED);
		testStatus(exFlow, "job2d", Status.FAILED);
		testStatus(exFlow, "job3", Status.KILLED);
		testStatus(exFlow, "job4", Status.KILLED);
		testStatus(exFlow, "job5", Status.KILLED);
		testStatus(exFlow, "job6", Status.SUCCEEDED);
		testStatus(exFlow, "job7", Status.KILLED);
		testStatus(exFlow, "job8", Status.KILLED);
		testStatus(exFlow, "job9", Status.KILLED);
		testStatus(exFlow, "job10", Status.KILLED);

		try {
			eventCollector.checkEventExists(new Type[] {Type.FLOW_STARTED, Type.FLOW_FINISHED});
		}
		catch (Exception e) {
			System.out.println(e.getMessage());
			
			Assert.fail(e.getMessage());
		}
	}
	
	@Test
	public void exec1FailedKillAll() throws Exception {
		MockExecutorLoader loader = new MockExecutorLoader();
		EventCollectorListener eventCollector = new EventCollectorListener();
		eventCollector.setEventFilterOut(Event.Type.JOB_FINISHED, Event.Type.JOB_STARTED, Event.Type.JOB_STATUS_CHANGED);
		File testDir = new File("unit/executions/exectest1");
		ExecutableFlow flow = prepareExecDir(testDir, "exec2", 1);
		flow.getExecutionOptions().setFailureAction(FailureAction.CANCEL_ALL);
		
		
		FlowRunner runner = createFlowRunner(flow, loader, eventCollector);
		
		runner.run();
		ExecutableFlow exFlow = runner.getExecutableFlow();
		
		Assert.assertTrue(runner.isCancelled());
		
		Assert.assertTrue("Expected flow " + Status.FAILED + " instead " + exFlow.getStatus(), exFlow.getStatus() == Status.FAILED);
		
		testStatus(exFlow, "job1", Status.SUCCEEDED);
		testStatus(exFlow, "job2d", Status.FAILED);
		testStatus(exFlow, "job3", Status.KILLED);
		testStatus(exFlow, "job4", Status.KILLED);
		testStatus(exFlow, "job5", Status.KILLED);
		testStatus(exFlow, "job6", Status.FAILED);
		testStatus(exFlow, "job7", Status.KILLED);
		testStatus(exFlow, "job8", Status.KILLED);
		testStatus(exFlow, "job9", Status.KILLED);
		testStatus(exFlow, "job10", Status.KILLED);
		
		try {
			eventCollector.checkEventExists(new Type[] {Type.FLOW_STARTED, Type.FLOW_FINISHED});
		}
		catch (Exception e) {
			System.out.println(e.getMessage());
			eventCollector.writeAllEvents();
			Assert.fail(e.getMessage());
		}
	}
	
	@Test
	public void exec1FailedFinishRest() throws Exception {
		MockExecutorLoader loader = new MockExecutorLoader();
		EventCollectorListener eventCollector = new EventCollectorListener();
		eventCollector.setEventFilterOut(Event.Type.JOB_FINISHED, Event.Type.JOB_STARTED, Event.Type.JOB_STATUS_CHANGED);
		File testDir = new File("unit/executions/exectest1");
		ExecutableFlow flow = prepareExecDir(testDir, "exec3", 1);
		flow.getExecutionOptions().setFailureAction(FailureAction.FINISH_ALL_POSSIBLE);
		FlowRunner runner = createFlowRunner(flow, loader, eventCollector);
		
		runner.run();
		ExecutableFlow exFlow = runner.getExecutableFlow();
		Assert.assertTrue("Expected flow " + Status.FAILED + " instead " + exFlow.getStatus(), exFlow.getStatus() == Status.FAILED);
		
		testStatus(exFlow, "job1", Status.SUCCEEDED);
		testStatus(exFlow, "job2d", Status.FAILED);
		testStatus(exFlow, "job3", Status.SUCCEEDED);
		testStatus(exFlow, "job4", Status.KILLED);
		testStatus(exFlow, "job5", Status.KILLED);
		testStatus(exFlow, "job6", Status.KILLED);
		testStatus(exFlow, "job7", Status.SUCCEEDED);
		testStatus(exFlow, "job8", Status.SUCCEEDED);
		testStatus(exFlow, "job9", Status.SUCCEEDED);
		testStatus(exFlow, "job10", Status.KILLED);
		
		try {
			eventCollector.checkEventExists(new Type[] {Type.FLOW_STARTED, Type.FLOW_FINISHED});
		}
		catch (Exception e) {
			System.out.println(e.getMessage());
			eventCollector.writeAllEvents();
			Assert.fail(e.getMessage());
		}
	}
	
	@Test
	public void execAndCancel() throws Exception {
		MockExecutorLoader loader = new MockExecutorLoader();
		EventCollectorListener eventCollector = new EventCollectorListener();
		eventCollector.setEventFilterOut(Event.Type.JOB_FINISHED, Event.Type.JOB_STARTED, Event.Type.JOB_STATUS_CHANGED);
		FlowRunner runner = createFlowRunner(loader, eventCollector, "exec1");
		
		Assert.assertTrue(!runner.isCancelled());
		Thread thread = new Thread(runner);
		thread.start();

		synchronized(this) {
			try {
				wait(4500);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
			runner.cancel("me");
			Assert.assertTrue(runner.isCancelled());
		}
		

		synchronized(this) {
			// Wait for cleanup.
			try {
				wait(1000);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		ExecutableFlow exFlow = runner.getExecutableFlow();
		testStatus(exFlow, "job1", Status.SUCCEEDED);
		testStatus(exFlow, "job2", Status.SUCCEEDED);
		testStatus(exFlow, "job5", Status.KILLED);
		testStatus(exFlow, "job7", Status.KILLED);
		testStatus(exFlow, "job8", Status.KILLED);
		testStatus(exFlow, "job10", Status.KILLED);
		testStatus(exFlow, "job3", Status.FAILED);
		testStatus(exFlow, "job4", Status.FAILED);
		testStatus(exFlow, "job6", Status.FAILED);
		
		Assert.assertTrue("Expected KILLED status instead got " + exFlow.getStatus(),exFlow.getStatus() == Status.KILLED);
		
		try {
			eventCollector.checkEventExists(new Type[] {Type.FLOW_STARTED, Type.FLOW_FINISHED});
		}
		catch (Exception e) {
			System.out.println(e.getMessage());
			eventCollector.writeAllEvents();
			Assert.fail(e.getMessage());
		}
	}
	
	@Test
	public void execRetries() throws Exception {
		MockExecutorLoader loader = new MockExecutorLoader();
		EventCollectorListener eventCollector = new EventCollectorListener();
		eventCollector.setEventFilterOut(Event.Type.JOB_FINISHED, Event.Type.JOB_STARTED, Event.Type.JOB_STATUS_CHANGED);
		FlowRunner runner = createFlowRunner(loader, eventCollector, "exec4-retry");
		
		runner.run();
		
		ExecutableFlow exFlow = runner.getExecutableFlow();
		testStatus(exFlow, "job-retry", Status.SUCCEEDED);
		testStatus(exFlow, "job-pass", Status.SUCCEEDED);
		testStatus(exFlow, "job-retry-fail", Status.FAILED);
		testAttempts(exFlow,"job-retry", 3);
		testAttempts(exFlow, "job-pass", 0);
		testAttempts(exFlow, "job-retry-fail", 2);
		
		Assert.assertTrue("Expected FAILED status instead got " + exFlow.getStatus(),exFlow.getStatus() == Status.FAILED);
	}
	
	private void testStatus(ExecutableFlow flow, String name, Status status) {
		ExecutableNode node = flow.getExecutableNode(name);
		
		if (node.getStatus() != status) {
			Assert.fail("Status of job " + node.getJobId() + " is " + node.getStatus() + " not " + status + " as expected.");
		}
	}
	
	private void testAttempts(ExecutableFlow flow, String name, int attempt) {
		ExecutableNode node = flow.getExecutableNode(name);
		
		if (node.getAttempt() != attempt) {
			Assert.fail("Expected " + attempt + " got " + node.getAttempt() + " attempts " + name );
		}
	}
	
	private ExecutableFlow prepareExecDir(File execDir, String flowName, int execId) throws IOException {
		FileUtils.copyDirectory(execDir, workingDir);
		
		File jsonFlowFile = new File(workingDir, flowName + ".flow");
		@SuppressWarnings("unchecked")
		HashMap<String, Object> flowObj = (HashMap<String, Object>) JSONUtils.parseJSONFromFile(jsonFlowFile);
		
		Flow flow = Flow.flowFromObject(flowObj);
		ExecutableFlow execFlow = new ExecutableFlow(flow);
		execFlow.setExecutionId(execId);
		execFlow.setExecutionPath(workingDir.getPath());
		return execFlow;
	}

	private void compareFinishedRuntime(FlowRunner runner) throws Exception {
		ExecutableFlow flow = runner.getExecutableFlow();
		for (String flowName: flow.getStartNodes()) {
			ExecutableNode node = flow.getExecutableNode(flowName);
			compareStartFinishTimes(flow, node, 0);
		}
	}
	
	private void compareStartFinishTimes(ExecutableFlow flow, ExecutableNode node, long previousEndTime) throws Exception {
		long startTime = node.getStartTime();
		long endTime = node.getEndTime();
		
		// If start time is < 0, so will the endtime.
		if (startTime <= 0) {
			Assert.assertTrue(endTime <=0);
			return;
		}
		
		//System.out.println("Node " + node.getJobId() + " start:" + startTime + " end:" + endTime + " previous:" + previousEndTime);
		Assert.assertTrue("Checking start and end times", startTime > 0 && endTime >= startTime);
		Assert.assertTrue("Start time for " + node.getJobId() + " is " + startTime +" and less than " + previousEndTime, startTime >= previousEndTime);
		
		for (String outNode : node.getOutNodes()) {
			ExecutableNode childNode = flow.getExecutableNode(outNode);
			compareStartFinishTimes(flow, childNode, endTime);
		}
	}
	
	private FlowRunner createFlowRunner(ExecutableFlow flow, ExecutorLoader loader, EventCollectorListener eventCollector) throws Exception {
		//File testDir = new File("unit/executions/exectest1");
		//MockProjectLoader projectLoader = new MockProjectLoader(new File(flow.getExecutionPath()));
		
		loader.uploadExecutableFlow(flow);
		FlowRunner runner = new FlowRunner(flow, loader, fakeProjectLoader, jobtypeManager);

		runner.addListener(eventCollector);
		
		return runner;
	}
	
	private FlowRunner createFlowRunner(ExecutorLoader loader, EventCollectorListener eventCollector, String flowName) throws Exception {
		File testDir = new File("unit/executions/exectest1");
		ExecutableFlow exFlow = prepareExecDir(testDir, flowName, 1);
		//MockProjectLoader projectLoader = new MockProjectLoader(new File(exFlow.getExecutionPath()));
		
		loader.uploadExecutableFlow(exFlow);
	
		FlowRunner runner = new FlowRunner(exFlow, loader, fakeProjectLoader, jobtypeManager);

		runner.addListener(eventCollector);
		
		return runner;
	}
}
