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package org.etlunit.context;

import org.etlunit.parser.ETLTestParser;
import org.etlunit.parser.ETLTestValueObject;
import org.etlunit.parser.ETLTestValueObjectImpl;
import org.etlunit.parser.ParseException;

import java.util.*;

public class VariableContextImpl implements VariableContext
{
	private final Map variableMap = new HashMap();
	private final VariableContext enclosingContext;


	class MapRepresentation implements Map
	{
		@Override
		public int size()
		{
			throw new UnsupportedOperationException();
		}

		@Override
		public boolean isEmpty()
		{
			throw new UnsupportedOperationException();
		}

		@Override
		public boolean containsKey(Object o)
		{
			throw new UnsupportedOperationException();
		}

		@Override
		public boolean containsValue(Object o)
		{
			throw new UnsupportedOperationException();
		}

		@Override
		public ETLTestValueObject get(Object o)
		{
			return getValue(String.valueOf(o));
		}

		@Override
		public ETLTestValueObject put(String s, ETLTestValueObject o)
		{
			setValue(s, o);

			return null;
		}

		@Override
		public ETLTestValueObject remove(Object o)
		{
			throw new UnsupportedOperationException();
		}

		@Override
		public void putAll(Map map)
		{
			throw new UnsupportedOperationException();
		}

		@Override
		public void clear()
		{
			throw new UnsupportedOperationException();
		}

		@Override
		public Set keySet()
		{
			throw new UnsupportedOperationException();
		}

		@Override
		public Collection values()
		{
			throw new UnsupportedOperationException();
		}

		@Override
		public Set> entrySet()
		{
			throw new UnsupportedOperationException();
		}
	}

	private final MapRepresentation mapRepresentation = new MapRepresentation();

	private static final VariableContext NULL_CONTEXT = new VariableContext()
	{
		@Override
		public void declareVariable(String variableName)
		{
			throw new IllegalStateException("NULL Context does not operate");
		}

		@Override
		public boolean hasVariableBeenDeclared(String variableName)
		{
			return false;
		}

		@Override
		public void removeVariable(String variableName)
		{
			throw new IllegalStateException("NULL Context does not operate");
		}

		@Override
		public ETLTestValueObject query(String variablePath)
		{
			throw new IllegalStateException("NULL Context does not operate");
		}

		@Override
		public ETLTestValueObject getValue(String variableName)
		{
			throw new IllegalStateException("NULL Context does not operate");
		}

		@Override
		public void setValue(String variableName, ETLTestValueObject value)
		{
			throw new IllegalStateException("NULL Context does not operate");
		}

		@Override
		public void setStringValue(String variableName, String value)
		{
			throw new IllegalStateException("NULL Context does not operate");
		}

		@Override
		public void setJSONValue(String variableName, String value)
		{
			throw new IllegalStateException("NULL Context does not operate");
		}

		@Override
		public void declareAndSetValue(String variableName, ETLTestValueObject value)
		{
			throw new IllegalStateException("NULL Context does not operate");
		}

		@Override
		public void declareAndSetStringValue(String variableName, String value)
		{
			throw new IllegalStateException("NULL Context does not operate");
		}

		@Override
		public void declareAndSetJSONValue(String variableName, String value)
		{
			throw new IllegalStateException("NULL Context does not operate");
		}

		@Override
		public VariableContext createNestedScope()
		{
			throw new IllegalStateException("NULL Context does not operate");
		}

		@Override
		public VariableContext getEnclosingScope()
		{
			throw new IllegalStateException("NULL Context does not operate");
		}

		@Override
		public VariableContext getTopLevelScope()
		{
			throw new IllegalStateException("NULL Context does not operate");
		}

		@Override
		public Map getMapRepresentation()
		{
			return Collections.emptyMap();
		}

		@Override
		public Map getVelocityWrapper()
		{
			throw new UnsupportedOperationException();
		}
	};

	private static final ETLTestValueObject NULL = new ETLTestValueObjectImpl("null");
	private VariableVelocityWrapper variableVelocityWrapper = new VariableVelocityWrapper(this);

	private VariableContextImpl(VariableContext context)
	{
		enclosingContext = context;
	}

	public VariableContextImpl()
	{
		enclosingContext = NULL_CONTEXT;
	}

	@Override
	public ETLTestValueObject getValue(String variableName)
	{
		if (!variableMap.containsKey(variableName))
		{
			if (!enclosingContext.hasVariableBeenDeclared(variableName))
			{
				throw new IllegalArgumentException("Variable " + variableName + " is undeclared");
			}

			return enclosingContext.getValue(variableName);
		}

		ETLTestValueObject v = variableMap.get(variableName);

		if (v == NULL)
		{
			return null;
		}

		//somehow convert the value using the velocity wrapper
		return v;
	}

	@Override
	public void setStringValue(String variableName, String value)
	{
		setValue(variableName, value == null ? null : new ETLTestValueObjectImpl(value));
	}

	@Override
	public void setJSONValue(String variableName, String value)
	{
		try
		{
			setValue(variableName, ETLTestParser.loadObject(value));
		}
		catch (ParseException e)
		{
			throw new IllegalArgumentException(e);
		}
	}

	@Override
	public void declareAndSetValue(String variableName, ETLTestValueObject value)
	{
		if (!hasVariableBeenDeclared(variableName))
		{
			declareVariable(variableName);
		}

		setValue(variableName, value);
	}

	@Override
	public void declareAndSetStringValue(String variableName, String value)
	{
		if (!hasVariableBeenDeclared(variableName))
		{
			declareVariable(variableName);
		}

		setStringValue(variableName, value);
	}

	@Override
	public void declareAndSetJSONValue(String variableName, String value)
	{
		if (!hasVariableBeenDeclared(variableName))
		{
			declareVariable(variableName);
		}

		setJSONValue(variableName, value);
	}

	@Override
	public void setValue(String variableName, ETLTestValueObject value)
	{
		if (!variableMap.containsKey(variableName))
		{
			if (!enclosingContext.hasVariableBeenDeclared(variableName))
			{
				throw new IllegalArgumentException("Variable " + variableName + " is undeclared");
			}

			enclosingContext.setValue(variableName, value);
		}
		else
		{
			variableMap.put(variableName, value == null ? NULL : value);
		}
	}

	@Override
	public void declareVariable(String variableName)
	{
		if (variableMap.containsKey(variableName))
		{
			throw new IllegalArgumentException("Variable " + variableName + " already exists in this scope");
		}

		variableMap.put(variableName, NULL);
	}

	@Override
	public boolean hasVariableBeenDeclared(String variableName)
	{
		return variableMap.containsKey(variableName) || enclosingContext.hasVariableBeenDeclared(variableName);
	}

	@Override
	public void removeVariable(String variableName)
	{
		if (!variableMap.containsKey(variableName))
		{
			if (enclosingContext.hasVariableBeenDeclared(variableName))
			{
				enclosingContext.removeVariable(variableName);
			}
			else
			{
				throw new IllegalArgumentException("Variable " + variableName + " not declared in this scope");
			}
		}

		variableMap.remove(variableName);
	}

	@Override
	public ETLTestValueObject query(String variablePath)
	{
		String[] pathElements = variablePath.split("\\.");

		ETLTestValueObject value = getValue(pathElements[0]);

		if (pathElements.length == 1)
		{
			return value;
		}
		else
		{
			return value.query(variablePath.substring(pathElements[0].length() + 1));
		}
	}

	@Override
	public VariableContext createNestedScope()
	{
		return new VariableContextImpl(this);
	}

	@Override
	public VariableContext getEnclosingScope()
	{
		return enclosingContext == NULL_CONTEXT ? null : enclosingContext;
	}

	@Override
	public VariableContext getTopLevelScope()
	{
		VariableContext scope = this;
		VariableContext nextScope = this;

		while ((nextScope = scope.getEnclosingScope()) != null)
		{
			scope = nextScope;
		}

		return scope;
	}

	@Override
	public Map getMapRepresentation()
	{
		return mapRepresentation;
	}

	@Override
	public Map getVelocityWrapper()
	{
		return variableVelocityWrapper;
	}
}