/********************************************************************
 * AUTHORS: Vijay Ganesh, Trevor Hansen, Dan Liew, Mate Soos
 *
 * BEGIN DATE: November, 2005
 *
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
********************************************************************/

#include "stp/AST/ASTKind.h"
#include "stp/Printer/printers.h"
#include <deque>
#include <string>

/*
 * Bench format  which the ABC logic synthesis tool can read.
 * No more than 2-arity seem to be accepted.
 */

namespace printer
{
using std::string;
using std::map;
using std::endl;

using namespace stp;

string name(const Kind k)
{
  return _kind_names[k];
}

string bvconstToString(const ASTNode& n)
{
  assert(n.GetKind() == BVCONST);
  std::stringstream output;
  output << *n.GetBVConst();
  return output.str();
}

// ABC doesn't like spaces, nor brackets. in variable names.
//  TODO CHECK that this doesn't cause duplicate names
string symbolToString(const ASTNode& n)
{
  assert(n.GetKind() == SYMBOL);
  std::stringstream output;
  n.nodeprint(output);

  string result = output.str();
  replace(result.begin(), result.end(), ' ', '_');
  replace(result.begin(), result.end(), '(', '_');
  replace(result.begin(), result.end(), ')', '_');

  return result;
}

string Bench_Print1(ostream& os, const ASTNode& n,
                    map<ASTNode, string>* alreadyOutput)
{

  assert(((n.GetKind() == SYMBOL) || (n.GetKind() == BVCONST) ||
          n.GetValueWidth() <= 1));
  assert(!n.IsNull());

  map<ASTNode, string>::iterator it;
  if ((it = alreadyOutput->find(n)) != alreadyOutput->end())
    return it->second;

  if (n.GetKind() == BVCONST)
  {
    (*alreadyOutput)[n] = bvconstToString(n);
    return (*alreadyOutput)[n];
  }

  if (n.GetKind() == SYMBOL)
  {
    (*alreadyOutput)[n] = symbolToString(n);
    return (*alreadyOutput)[n];
  }

  if (n.GetKind() == TRUE)
  {
    return "vdd";
  }

  if (n.GetKind() == FALSE)
  {
    return "gnd";
  }

  if (n.GetKind() == BOOLEXTRACT)
  {
    assert(n[1].GetKind() == BVCONST);
    std::stringstream nn;
    nn << Bench_Print1(os, n[0], alreadyOutput) << "_"
       << Bench_Print1(os, n[1], alreadyOutput);
    (*alreadyOutput)[n] = nn.str();
    return (*alreadyOutput)[n];
  }

  std::stringstream nodeNameSS;
  nodeNameSS << "n" << n.GetNodeNum();

  string thisNode = nodeNameSS.str();
  (*alreadyOutput)[n] = thisNode;

  assert(n.Degree() > 0);
  std::stringstream output;

  // The bench format doesn't accept propositional ITEs.
  if (n.GetKind() == ITE)
  {
    assert(n.Degree() == 3);
    string p = Bench_Print1(os, n[0], alreadyOutput);
    string p1 = Bench_Print1(os, n[1], alreadyOutput);
    string p2 = Bench_Print1(os, n[2], alreadyOutput);

    os << thisNode << "_1 = AND(" << p << "," << p1 << ")" << endl;
    os << thisNode << "_2"
       << " = NOT(" << p << ")," << endl;
    os << thisNode << "_3"
       << " = AND(" << thisNode << "_2"
       << "," << p2 << ")" << endl;
    os << thisNode << "="
       << "OR(," << thisNode << "_1"
       << "," << thisNode << "_3)" << endl;
  }
  else
  {
    if (n.Degree() > 2)
    {
      assert(n.GetKind() == AND || n.GetKind() == XOR ||
             n.GetKind() == OR); // must be associative.
      std::deque<string> names;

      for (unsigned i = 0; i < n.Degree(); i++)
        names.push_back(Bench_Print1(os, n[i], alreadyOutput));

      int id = 0;

      while (names.size() > 2)
      {
        string a = names.front();
        names.pop_front();

        string b = names.front();
        names.pop_front();

        std::stringstream thisName;
        thisName << thisNode << "___" << id++;

        output << thisName.str() << "=" << name(n.GetKind()) << "(" << a << ","
               << b << ")" << endl;

        names.push_back(thisName.str());
      }

      assert(names.size() == 2);
      // last two now.

      string a = names.front();
      names.pop_front();
      string b = names.front();
      names.pop_front();

      output << thisNode << "=" << name(n.GetKind()) << "(" << a << "," << b
             << ")" << endl;
      os << output.str();
    }
    else
    {
      output << thisNode << "=" << name(n.GetKind()) << "(";
      for (unsigned i = 0; i < n.Degree(); i++)
      {
        if (i >= 1)
          output << " , ";
        output << Bench_Print1(os, n[i], alreadyOutput);
      }
      os << output.str() << ")" << endl;
    }
  }
  return thisNode;
}

void OutputInputs(ostream& os, const ASTNode& n,
                  std::unordered_set<int>* alreadyOutput)
{
  if (alreadyOutput->find(n.GetNodeNum()) != alreadyOutput->end())
    return;

  alreadyOutput->insert(n.GetNodeNum());

  if (n.GetKind() == BOOLEXTRACT)
  {
    assert(n[1].GetKind() == BVCONST);
    std::stringstream nn;
    n[0].nodeprint(nn);
    nn << "_" << bvconstToString(n[1]);
    os << "INPUT(" << nn.str() << ")" << endl;
    return;
  }

  // A boolean symbol.
  if (n.GetKind() == SYMBOL)
  {
    os << "INPUT(" << symbolToString(n) << ")" << endl;
    return;
  }

  for (unsigned i = 0; i < n.Degree(); i++)
  {
    OutputInputs(os, n[i], alreadyOutput);
  }
}

ostream& Bench_Print(ostream& os, const ASTNode n)
{
  std::unordered_set<int> alreadyOutput2;

  OutputInputs(os, n, &alreadyOutput2);

  map<ASTNode, string> alreadyOutput;

  os << "OUTPUT("
     << "n" << n.GetNodeNum() << ")" << endl;
  Bench_Print1(os, n, &alreadyOutput);
  return os;
}
}