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package org.etlunit.util;

import org.etlunit.parser.ETLTestMethod;

import java.io.*;
import java.util.*;

public class TestHistory
{

	private int currentRunId;

	private HistoryRun getRunList(boolean newRunId)
	{
		if (newRunId || runList.isEmpty())
		{
			runList.add(new HistoryRun());
		}

		// if list is getting too long remove the oldest (first) element
		if (runList.size() > 25)
		{
			runList.remove(0);
		}

		return runList.get(runList.size() - 1);
	}

	public enum test_result
	{

		passed,
		failed,
		errored
	}

	public interface TestMethodHistory
	{

		test_result getTestResult();

		String getTestClassName();

		String getTestMethodName();
	}

	final class TestMethodHistoryImpl implements TestMethodHistory
	{

		private final String testClassName;
		private final String testMethodName;
		private final test_result testResult;

		public TestMethodHistoryImpl(String testClassName, String testMethodName, test_result testResult)
		{
			this.testClassName = testClassName;
			this.testMethodName = testMethodName;
			this.testResult = testResult;
		}

		public test_result getTestResult()
		{
			return testResult;
		}

		public String getTestClassName()
		{
			return testClassName;
		}

		public String getTestMethodName()
		{
			return testMethodName;
		}
	}

	private final class HistoryRun
	{
		final List passedList = new ArrayList();
		final List failedList = new ArrayList();
		final List erroredList = new ArrayList();
		final List badList = new ArrayList();
		final Map badMap = new HashMap();
	}

	private final List runList = new ArrayList();

	private final File historyFile;

	public TestHistory(File hist)
	{
		historyFile = hist;
	}

	public int getCurrentRunId()
	{
		return currentRunId;
	}

	public void load()
	{
		if (historyFile.exists())
		{
			try
			{
				BufferedReader br = new BufferedReader(new FileReader(historyFile));

				try
				{
					String line = null;

					while ((line = br.readLine()) != null)
					{
						StringTokenizer stk = new StringTokenizer(line, " ");

						if (stk.countTokens() != 3)
						{
							// this line is corrupted.  Skip.
							throw new IllegalStateException();
						}

						String runId = stk.nextToken();

						boolean newRunId = false;

						try
						{
							int iRunId = Integer.parseInt(runId);

							if (iRunId > currentRunId)
							{
								throw new IllegalStateException();
							}

							if (iRunId == currentRunId)
							{
								currentRunId = iRunId + 1;
								newRunId = true;
							}
						}
						catch (NumberFormatException exc)
						{
							// bad number - abort line.
							throw new IllegalStateException();
						}

						HistoryRun run = getRunList(newRunId);

						String method = stk.nextToken();

						int index = method.lastIndexOf('.');

						String tclass = method.substring(0, index);
						method = method.substring(index + 1);

						String status = stk.nextToken();

						TestMethodHistoryImpl
								impl =
								new TestMethodHistoryImpl(tclass,
										method,
										(status.equals("pass")
												? test_result.passed
												: (status.equals("fail") ? test_result.failed : test_result.errored)));

						switch (impl.getTestResult())
						{
							case passed:
								run.passedList.add(impl);
								break;
							case failed:
								run.failedList.add(impl);
								run.badList.add(impl);
								run.badMap.put(tclass, tclass);
								break;
							case errored:
								run.erroredList.add(impl);
								run.badList.add(impl);
								run.badMap.put(tclass, tclass);
								break;
						}
					}
				}
				finally
				{
					br.close();
				}
			}
			catch (IOException exc)
			{
				throw new IllegalStateException(exc);
			}
			catch (IllegalStateException exc)
			{
				reset();
			}
		}
	}

	public void reset()
	{
		try
		{
			RandomAccessFile raf = new RandomAccessFile(historyFile, "rw");
			raf.setLength(0);
			raf.close();
		}
		catch (IOException exc)
		{
			throw new IllegalStateException(exc);
		}
	}

	public void addMethod(ETLTestMethod method, test_result res) throws IOException
	{
		FileWriter fw = new FileWriter(historyFile, true);

		try
		{
			fw.write(currentRunId + " " + method.getTestClass().getName() + "." + method.getName() + " " + (res
					== test_result.passed ? "pass" : (res == test_result.failed ? "fail" : "error")) + "\n");
		}
		finally
		{
			fw.close();
		}
	}

	public List getFailedTests(int runId)
	{
		if (runId >= currentRunId || runId < 0)
		{
			throw new IllegalArgumentException("Run does not exist: " + runId);
		}

		return runList.get(
				runList.size() - (currentRunId - runId)
											).failedList;
	}

	public List getFailedTests()
	{
		return getFailedTests(currentRunId - 1);
	}

	public List getErroredTests(int runId)
	{
		if (runId >= currentRunId || runId < 0)
		{
			throw new IllegalArgumentException("Run does not exist: " + runId);
		}

		return runList.get(
				runList.size() - (currentRunId - runId)
											).erroredList;
	}

	public List getErroredTests()
	{
		return getErroredTests(currentRunId - 1);
	}

	public List getPassedTests(int runId)
	{
		if (runId >= currentRunId || runId < 0)
		{
			throw new IllegalArgumentException("Run does not exist: " + runId);
		}

		return runList.get(
				runList.size() - (currentRunId - runId)
											).passedList;
	}

	public List getPassedTests()
	{
		return getPassedTests(currentRunId - 1);
	}

	public boolean isTestClassFailed(String name, int runId)
	{
		if (runId >= currentRunId || runId < 0)
		{
			throw new IllegalArgumentException("Run does not exist: " + runId);
		}

		return runList.get(
				runList.size() - (currentRunId - runId)
											).badMap.containsKey(name);
	}

	public boolean isTestClassFailed(String name)
	{
		return isTestClassFailed(name, currentRunId - 1);
	}
}