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/*******************************************************************************
 *
 *	Copyright (c) 2016 Fujitsu Services Ltd.
 *
 *	Author: Nick Battle
 *
 *	This file is part of VDMJ.
 *
 *	VDMJ is free software: you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation, either version 3 of the License, or
 *	(at your option) any later version.
 *
 *	VDMJ is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with VDMJ.  If not, see .
 *	SPDX-License-Identifier: GPL-3.0-or-later
 *
 ******************************************************************************/

package com.fujitsu.vdmj.in.expressions;

import com.fujitsu.vdmj.ast.lex.LexToken;
import com.fujitsu.vdmj.in.expressions.visitors.INExpressionVisitor;
import com.fujitsu.vdmj.runtime.Context;
import com.fujitsu.vdmj.runtime.ValueException;
import com.fujitsu.vdmj.values.CompFunctionValue;
import com.fujitsu.vdmj.values.FunctionValue;
import com.fujitsu.vdmj.values.MapValue;
import com.fujitsu.vdmj.values.Value;
import com.fujitsu.vdmj.values.ValueMap;

public class INCompExpression extends INBinaryExpression
{
	private static final long serialVersionUID = 1L;

	public INCompExpression(INExpression left, LexToken op, INExpression right)
	{
		super(left, op, right);
	}

	@Override
	public Value eval(Context ctxt)
	{
		// breakpoint.check(location, ctxt);
		location.hit();		// Mark as covered

		Value lv = left.eval(ctxt).deref();
		Value rv = right.eval(ctxt).deref();

		if (lv instanceof MapValue)
		{
			ValueMap lm = null;
			ValueMap rm = null;

			try
			{
				lm = lv.mapValue(ctxt);
				rm = rv.mapValue(ctxt);
			}
			catch (ValueException e)
			{
				return abort(e);
			}

			ValueMap result = new ValueMap();

			for (Value v: rm.keySet())
			{
				Value rng = lm.get(rm.get(v));
				
				if (rng == null)
				{
					abort(4162, "The RHS range is not a subset of the LHS domain", ctxt);
				}
				
				Value old = result.put(v, rng);

				if (old != null && !old.equals(rng))
				{
					abort(4005, "Duplicate map keys have different values", ctxt);
				}
			}

			return new MapValue(result);
		}

		try
		{
			FunctionValue f1 = lv.functionValue(ctxt);
			FunctionValue f2 = rv.functionValue(ctxt);

			return new CompFunctionValue(f1, f2);
		}
		catch (ValueException e)
		{
			return abort(e);
		}
	}

	@Override
	public  R apply(INExpressionVisitor visitor, S arg)
	{
		return visitor.caseCompExpression(this, arg);
	}
}