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package org.etlunit.feature.extend;

import org.etlunit.*;
import org.etlunit.context.VariableContext;
import org.etlunit.feature.*;
import org.etlunit.json.validator.JsonSchema;
import org.etlunit.parser.*;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

@FeatureModule
public abstract class ExtensibleFeatureModule extends AbstractFeature
{
	private final
	List
			extenders =
			new ArrayList();

	@Override
	public final ClassListener getListener()
	{
		return new ClassListener()
		{
			private final ClassListener classListener = getDelegateListener();

			@Override
			public void begin(ETLTestClass cl, final VariableContext context)
					throws TestAssertionFailure, TestExecutionError, TestWarning
			{
				if (classListener != null)
				{
					classListener.begin(cl, context);
				}
			}

			@Override
			public void declare(ETLTestVariable var, final VariableContext context)
			{
				if (classListener != null)
				{
					classListener.declare(var, context);
				}
			}

			@Override
			public void begin(ETLTestMethod mt, final VariableContext context)
					throws TestAssertionFailure, TestExecutionError, TestWarning
			{
				if (classListener != null)
				{
					classListener.begin(mt, context);
				}
			}

			@Override
			public void begin(ETLTestOperation op, ETLTestValueObject parameters, VariableContext vcontext, ExecutionContext econtext)
					throws TestAssertionFailure, TestExecutionError, TestWarning
			{
				if (classListener != null)
				{
					classListener.begin(op, parameters, vcontext, econtext);
				}
			}

			@Override
			public action_code process(ETLTestOperation op, ETLTestValueObject obj, VariableContext context, ExecutionContext econtext)
					throws TestAssertionFailure, TestExecutionError, TestWarning
			{
				if (handles(op, obj))
				{
					return FeatureListenerProxy.processListenerList(extenders, op, obj, context, econtext, applicationLog);
				}

				return action_code.defer;
			}

			@Override
			public void end(ETLTestOperation op, ETLTestValueObject parameters, VariableContext vcontext, ExecutionContext econtext)
					throws TestAssertionFailure, TestExecutionError, TestWarning
			{
				if (classListener != null)
				{
					classListener.end(op, parameters, vcontext, econtext);
				}
			}

			@Override
			public void end(ETLTestMethod mt, final VariableContext context)
					throws TestAssertionFailure, TestExecutionError, TestWarning
			{
				if (classListener != null)
				{
					classListener.end(mt, context);
				}
			}

			@Override
			public void end(ETLTestClass cl, final VariableContext context)
					throws TestAssertionFailure, TestExecutionError, TestWarning
			{
				if (classListener != null)
				{
					classListener.end(cl, context);
				}
			}
		};
	}

	@Override
	public FeatureMetaInfo getMetaInfo()
	{
		final FeatureMetaInfo meta = super.getMetaInfo();

		return new FeatureMetaInfo()
		{
			@Override
			public String getFeatureConfiguration()
			{
				return meta.getFeatureConfiguration();
			}

			@Override
			public JsonSchema getFeatureConfigurationValidator()
			{
				return meta.getFeatureConfigurationValidator();
			}

			@Override
			public Map getExportedOperations()
			{
				return meta.getExportedOperations();
			}

			@Override
			public Map getExportedAnnotations()
			{
				return meta.getExportedAnnotations();
			}

			public List getOperationValidator(String operation)
			{
				List list = new ArrayList();

				// check with each validator
				for (FeatureListenerProxy.FeatureOperationProcessor extender : extenders)
				{
					Feature feature = extender.getFeature();
					if (feature != ExtensibleFeatureModule.this)
					{
						List schema = feature.getMetaInfo().getExportedOperations().get(operation).getValidator();

						if (schema != null)
						{
							list.addAll(schema);
						}
					}
				}

				return list;
			}

			@Override
			public boolean isInternalFeature()
			{
				return meta.isInternalFeature();
			}

			@Override
			public String getFeatureUsage()
			{
				return meta.getFeatureUsage();
			}

			@Override
			public List getOptions()
			{
				return Collections.emptyList();
			}
		};
	}

	public final void extend(final Extender exe)
	{
		extenders.add(new FeatureListenerProxy.FeatureOperationProcessor()
		{
			@Override
			public boolean handlesRequest(ETLTestOperation operation, ETLTestValueObject operands, VariableContext context, ExecutionContext econtext)
			{
				return exe.canHandleRequest(operation, operands, context, econtext);
			}

			@Override
			public Feature getFeature()
			{
				return exe.getFeature();
			}

			@Override
			public OperationProcessor getOperationProcessor()
			{
				return exe;
			}
		});
	}

	protected abstract boolean handles(ETLTestOperation op, ETLTestValueObject obj);

	protected ClassListener getDelegateListener()
	{
		return null;
	}
}