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/**
 * Copyright (C) 2010-2018 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite 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
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see .
 */
package org.evosuite.symbolic.vm.string.reader;

import java.io.StringReader;

import org.evosuite.symbolic.expr.reader.StringReaderExpr;
import org.evosuite.symbolic.expr.ref.ReferenceConstant;
import org.evosuite.symbolic.expr.str.StringValue;
import org.evosuite.symbolic.vm.SymbolicEnvironment;
import org.evosuite.symbolic.vm.SymbolicFunction;
import org.evosuite.symbolic.vm.SymbolicHeap;
import org.evosuite.symbolic.vm.string.Types;

public final class StringReader_Read extends SymbolicFunction {

	private static final String READ = "read";

	public StringReader_Read(SymbolicEnvironment env) {
		super(env, Types.JAVA_IO_STRING_READER, READ, Types.TO_INT_DESCRIPTOR);
	}

	@Override
	public Object executeFunction() {

		ReferenceConstant symb_str_reader = this.getSymbReceiver();
		StringReader conc_str_reader = (StringReader) this.getConcReceiver();

		StringReaderExpr stringReaderExpr = (StringReaderExpr) env.heap
				.getField(Types.JAVA_IO_STRING_READER,
						SymbolicHeap.$STRING_READER_VALUE, conc_str_reader,
						symb_str_reader);

		if (stringReaderExpr != null
				&& stringReaderExpr.containsSymbolicVariable()) {

			StringValue symb_string = stringReaderExpr.getString();
			String conc_string = symb_string.getConcreteValue();

			int currPosition = stringReaderExpr.getReaderPosition();

			if (currPosition < conc_string.length()) {
				// update symbolic string reader
				currPosition++;

				int conc_string_reader_value;
				if (currPosition >= conc_string.length()) {
					conc_string_reader_value = -1;
				} else {
					conc_string_reader_value = conc_string.charAt(currPosition);
				}

				StringReaderExpr newStringReaderExpr = new StringReaderExpr(
						(long) conc_string_reader_value, symb_string,
						currPosition);
				env.heap.putField(Types.JAVA_IO_STRING_READER,
						SymbolicHeap.$STRING_READER_VALUE, conc_str_reader,
						symb_str_reader, newStringReaderExpr);

			}

			// returns STRING_READER(string,currPosition)
			return stringReaderExpr;

		}
		return this.getSymbIntegerRetVal();
	}
}