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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;

import java.util.ArrayList;
import java.util.Collections;

import org.evosuite.symbolic.expr.Expression;
import org.evosuite.symbolic.expr.Operator;
import org.evosuite.symbolic.expr.bv.IntegerConstant;
import org.evosuite.symbolic.expr.bv.IntegerValue;
import org.evosuite.symbolic.expr.bv.StringBinaryComparison;
import org.evosuite.symbolic.expr.bv.StringMultipleComparison;
import org.evosuite.symbolic.expr.ref.ReferenceConstant;
import org.evosuite.symbolic.expr.ref.ReferenceExpression;
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;

public abstract class StartsWith extends SymbolicFunction {

  private static final String STARTS_WITH = "startsWith";

  public StartsWith(SymbolicEnvironment env, String desc) {
    super(env, Types.JAVA_LANG_STRING, STARTS_WITH, desc);
  }

  public static final class StartsWith_S extends StartsWith {

    public StartsWith_S(SymbolicEnvironment env) {
      super(env, Types.STR_TO_BOOL_DESCRIPTOR);
    }

    @Override
    public Object executeFunction() {

      // receiver
      ReferenceConstant symb_receiver = this.getSymbReceiver();
      String conc_receiver = (String) this.getConcReceiver();
      // prefix argument
      ReferenceExpression symb_prefix = this.getSymbArgument(0);
      String conc_prefix = (String) this.getConcArgument(0);

      // return value
      boolean res = this.getConcBooleanRetVal();

      StringValue stringReceiverExpr = env.heap.getField(Types.JAVA_LANG_STRING,
          SymbolicHeap.$STRING_VALUE, conc_receiver, symb_receiver, conc_receiver);

      if (symb_prefix instanceof ReferenceConstant) {
        ReferenceConstant non_null_symb_prefix = (ReferenceConstant) symb_prefix;

        StringValue prefixExpr = env.heap.getField(Types.JAVA_LANG_STRING,
            SymbolicHeap.$STRING_VALUE, conc_prefix, non_null_symb_prefix, conc_prefix);

        if (stringReceiverExpr.containsSymbolicVariable()
            || prefixExpr.containsSymbolicVariable()) {
          int conV = res ? 1 : 0;

          StringBinaryComparison strTExpr = new StringBinaryComparison(stringReceiverExpr,
              Operator.STARTSWITH, prefixExpr, (long) conV);

          return strTExpr;
        }

      }
      return this.getSymbIntegerRetVal();
    }

  }

  public static final class StartsWith_SI extends StartsWith {

    public StartsWith_SI(SymbolicEnvironment env) {
      super(env, Types.STR_INT_TO_BOOL_DESCRIPTOR);
    }

    @Override
    public Object executeFunction() {

      // receiver
      ReferenceConstant symb_receiver = this.getSymbReceiver();
      String conc_receiver = (String) this.getConcReceiver();
      // prefix argument
      ReferenceExpression symb_prefix = this.getSymbArgument(0);
      String conc_prefix = (String) this.getConcArgument(0);
      // toffset argument
      IntegerValue offsetExpr = this.getSymbIntegerArgument(1);

      // return value
      boolean res = this.getConcBooleanRetVal();

      StringValue stringReceiverExpr = env.heap.getField(Types.JAVA_LANG_STRING,
          SymbolicHeap.$STRING_VALUE, conc_receiver, symb_receiver, conc_receiver);

      if (symb_prefix instanceof ReferenceConstant) {
        ReferenceConstant non_null_symb_prefix = (ReferenceConstant) symb_prefix;

        StringValue prefixExpr = env.heap.getField(Types.JAVA_LANG_STRING,
            SymbolicHeap.$STRING_VALUE, conc_prefix, non_null_symb_prefix, conc_prefix);

        if (stringReceiverExpr.containsSymbolicVariable() || prefixExpr.containsSymbolicVariable()
            || offsetExpr.containsSymbolicVariable()) {
          int conV = res ? 1 : 0;

          StringMultipleComparison strTExpr =
              new StringMultipleComparison(stringReceiverExpr, Operator.STARTSWITH, prefixExpr,
                  new ArrayList>(Collections.singletonList(offsetExpr)), (long) conV);

          return strTExpr;
        }

      }
      return this.getSymbIntegerRetVal();
    }
  }
}