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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.tc.expressions;

import com.fujitsu.vdmj.lex.LexLocation;
import com.fujitsu.vdmj.tc.expressions.visitors.TCExpressionVisitor;
import com.fujitsu.vdmj.tc.types.TCSeqType;
import com.fujitsu.vdmj.tc.types.TCType;
import com.fujitsu.vdmj.tc.types.TCTypeList;
import com.fujitsu.vdmj.tc.types.TCUnknownType;
import com.fujitsu.vdmj.typechecker.Environment;
import com.fujitsu.vdmj.typechecker.NameScope;

public class TCDistConcatExpression extends TCUnaryExpression
{
	private static final long serialVersionUID = 1L;

	public TCDistConcatExpression(LexLocation location, TCExpression exp)
	{
		super(location, exp);
	}

	@Override
	public String toString()
	{
		return "(conc " + exp + ")";
	}

	@Override
	public TCType typeCheck(Environment env, TCTypeList qualifiers, NameScope scope, TCType constraint)
	{
		TCSeqType seqType = null;
		
		if (constraint != null)
		{
			seqType = new TCSeqType(location, constraint);
		}

		TCType result = exp.typeCheck(env, null, scope, seqType);

		if (result.isSeq(location))
		{
			TCType inner = result.getSeq().seqof;

			if (inner.isSeq(location))
			{
				return setType(inner.getSeq());
			}
		}

		report(3075, "Argument of 'conc' is not a seq of seq");
		return setType(new TCUnknownType(location));
	}

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