/*
  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad

  Stockfish 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.

  Stockfish 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/


////
//// Includes
////
#include <fstream>
#include <sstream>
#include <vector>

#include "benchmark.h"
#include "search.h"
#include "thread.h"
#include "ucioption.h"

using namespace std;

////
//// Variables
////

const string BenchmarkPositions[] = {
  "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
  "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -",
  "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - -",
  "4rrk1/pp1n3p/3q2pQ/2p1pb2/2PP4/2P3N1/P2B2PP/4RRK1 b - - 7 19",
  "rq3rk1/ppp2ppp/1bnpb3/3N2B1/3NP3/7P/PPPQ1PP1/2KR3R w - - 7 14",
  "r1bq1r1k/1pp1n1pp/1p1p4/4p2Q/4Pp2/1BNP4/PPP2PPP/3R1RK1 w - - 2 14",
  "r3r1k1/2p2ppp/p1p1bn2/8/1q2P3/2NPQN2/PPP3PP/R4RK1 b - - 2 15",
  "r1bbk1nr/pp3p1p/2n5/1N4p1/2Np1B2/8/PPP2PPP/2KR1B1R w kq - 0 13",
  "r1bq1rk1/ppp1nppp/4n3/3p3Q/3P4/1BP1B3/PP1N2PP/R4RK1 w - - 1 16",
  "4r1k1/r1q2ppp/ppp2n2/4P3/5Rb1/1N1BQ3/PPP3PP/R5K1 w - - 1 17",
  "2rqkb1r/ppp2p2/2npb1p1/1N1Nn2p/2P1PP2/8/PP2B1PP/R1BQK2R b KQ - 0 11",
  "r1bq1r1k/b1p1npp1/p2p3p/1p6/3PP3/1B2NN2/PP3PPP/R2Q1RK1 w - - 1 16",
  "3r1rk1/p5pp/bpp1pp2/8/q1PP1P2/b3P3/P2NQRPP/1R2B1K1 b - - 6 22",
  "r1q2rk1/2p1bppp/2Pp4/p6b/Q1PNp3/4B3/PP1R1PPP/2K4R w - - 2 18",
  "4k2r/1pb2ppp/1p2p3/1R1p4/3P4/2r1PN2/P4PPP/1R4K1 b  - 3 22",
  "3q2k1/pb3p1p/4pbp1/2r5/PpN2N2/1P2P2P/5PP1/Q2R2K1 b - - 4 26"
};


////
//// Functions
////

/// benchmark() runs a simple benchmark by letting Stockfish analyze a set
/// of positions for a given time each.  There are four parameters; the
/// transposition table size, the number of search threads that should
/// be used, the time in seconds spent for each position (optional, default
/// is 60) and an optional file name where to look for positions in fen
/// format (default are the BenchmarkPositions defined above).
/// The analysis is written to a file named bench.txt.

void benchmark(const string& commandLine) {

  istringstream csVal(commandLine);
  istringstream csStr(commandLine);
  string ttSize, threads, fileName, limitType, timFile;
  int val, secsPerPos, maxDepth, maxNodes;

  csStr >> ttSize;
  csVal >> val;
  if (val < 4 || val > 1024)
  {
      cerr << "The hash table size must be between 4 and 1024" << endl;
      Application::exit_with_failure();
  }
  csStr >> threads;
  csVal >> val;
  if (val < 1 || val > MAX_THREADS)
  {
      cerr << "The number of threads must be between 1 and " << MAX_THREADS << endl;
      Application::exit_with_failure();
  }
  set_option_value("Hash", ttSize);
  set_option_value("Threads", threads);
  set_option_value("OwnBook", "false");
  set_option_value("Use Search Log", "true");
  set_option_value("Search Log Filename", "bench.txt");

  csVal >> val;
  csVal >> fileName;
  csVal >> limitType;
  csVal >> timFile;

  secsPerPos = maxDepth = maxNodes = 0;

  if (limitType == "time")
      secsPerPos = val * 1000;
  else if (limitType == "depth" || limitType == "perft")
      maxDepth = val;
  else
      maxNodes = val;

  vector<string> positions;

  if (fileName != "default")
  {
      ifstream fenFile(fileName.c_str());
      if (!fenFile.is_open())
      {
          cerr << "Unable to open positions file " << fileName << endl;
          Application::exit_with_failure();
      }
      string pos;
      while (fenFile.good())
      {
          getline(fenFile, pos);
          if (!pos.empty())
              positions.push_back(pos);
      }
      fenFile.close();
  } else
      for (int i = 0; i < 16; i++)
          positions.push_back(string(BenchmarkPositions[i]));

  ofstream timingFile;
  if (!timFile.empty())
  {
      timingFile.open(timFile.c_str(), ios::out | ios::app);
      if (!timingFile.is_open())
      {
          cerr << "Unable to open timing file " << timFile << endl;
          Application::exit_with_failure();
      }
  }

  vector<string>::iterator it;
  int cnt = 1;
  int64_t totalNodes = 0;
  int startTime = get_system_time();

  for (it = positions.begin(); it != positions.end(); ++it, ++cnt)
  {
      Move moves[1] = {MOVE_NONE};
      int dummy[2] = {0, 0};
      Position pos(*it);
      cerr << "\nBench position: " << cnt << '/' << positions.size() << endl << endl;
      if (limitType == "perft")
      {
          int64_t perftCnt = perft(pos, maxDepth * OnePly);
          cerr << "\nPerft " << maxDepth << " result (nodes searched): " << perftCnt << endl << endl;
          totalNodes += perftCnt;
      } else {
          if (!think(pos, false, false, 0, dummy, dummy, 0, maxDepth, maxNodes, secsPerPos, moves))
              break;
          totalNodes += nodes_searched();
      }
  }

  cnt = get_system_time() - startTime;
  cerr << "==============================="
       << "\nTotal time (ms) : " << cnt
       << "\nNodes searched  : " << totalNodes
       << "\nNodes/second    : " << (int)(totalNodes/(cnt/1000.0)) << endl << endl;

  if (!timFile.empty())
  {
      timingFile << cnt << endl << endl;
      timingFile.close();
  }

  // Under MS Visual C++ debug window always unconditionally closes
  // when program exits, this is bad because we want to read results before.
  #if (defined(WINDOWS) || defined(WIN32) || defined(WIN64))
  cerr << "Press any key to exit" << endl;
  cin >> fileName;
  #endif
}