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/*  util.cpp

    June 9, 2011

    Some helper functions.

    Much of the code below is borrowed from Alastair Smith's program

    from the 2010 FPT Othello competition

    By Kevin Nam

*/

#include <string.h>

#include <assert.h>

#include <stdio.h>

#include <stdlib.h>

#include <iostream>

#include <sys/time.h>

#include "util.h"

#define IA 1103515245u

#define IC 12345u

#define IM 2147483648u

using namespace std;

static unsigned int current_random = 0;

char select_AI_colour (int argc, char **argv){

    char ai_colour='L';

    int i;

   // cout<<"Please enter referee AI's colour. L or D"<<endl;

   // cin >> ai_colour;

        //////////for(i=0;i<argc; i++){

        //////////  if((strncmp(argv[i],"-player",7)==0) && (i< (argc+1)) ){

        //////////           ai_colour= *argv[i+1];

        //////////  }

        //////////}

   // while (ai_colour != 'L' && ai_colour != 'D'){

   //     cout<<"Invalid colour. Single character L or D"<<endl;

   //     cin >> ai_colour;

   // }

   // cout<<"AI is playing as "<<ai_colour<<endl;

    return ai_colour;

}

int select_com_port(int argc, char **argv)

{

  string com_port;

  int i, port;

  bool cmd_line_port_set = false;

  for(i=0;i<argc; i++){

          if((strncmp(argv[i],"-port",5)==0) && (i< (argc+1)) ){

                  com_port = argv[i+1];

                  cmd_line_port_set = true;

          }

  }

  if( !cmd_line_port_set ){

    cout << "Please enter serial port name. Ex. /dev/comx (windows) or /dev/ttyx (linux)\n";

    cin >> com_port;

  }

  port = open(com_port.c_str(), O_RDWR | O_NOCTTY | O_NONBLOCK);

  while(port < 0) // if open is unsucessful keep trying until the user specifies a good port

  {

    cout << "Unable to open port " << com_port << ", try again, should be: (windows) /dev/comx or (linux) /dev/ttyx ?\n";

    cin >> com_port;

    port = open(com_port.c_str(), O_RDWR | O_NOCTTY | O_NONBLOCK);

  }

  setup_port(port);

  cout << "COM port has been set up at a baud rate of 115200\n";

  return port;

}

void setup_port(int fd) {

    struct termios options;

    fcntl(fd, F_SETFL, 0);

    tcgetattr(fd, &options);

    cfsetispeed(&options, B115200);

    cfsetospeed(&options, B115200);

    options.c_cflag |= (CLOCAL | CREAD);

    tcsetattr(fd, TCSANOW, &options);

    // set up non-blocking port, so that we can time out

        int opts;

        opts = fcntl(fd,F_GETFL);

        if (opts < 0) {

                perror("fcntl(F_GETFL)");

                exit(EXIT_FAILURE);

        }

        opts = (opts | O_NONBLOCK);

        if (fcntl(fd,F_SETFL,opts) < 0) {

                perror("fcntl(F_SETFL)");

                exit(EXIT_FAILURE);

        }

        return;

}

int char_to_int (char c){

    if (c == '0') return 0;

    else if (c == '1') return 1;

    else if (c == '2') return 2;

    else if (c == '3') return 3;

    else if (c == '4') return 4;

    else if (c == '5') return 5;

    else if (c == '6') return 6;

    else if (c == '7') return 7;

    else if (c == '8') return 8;

    else if (c == '9') return 9;

    return 0;

}

void wait(double seconds){

    timeval tim;

    gettimeofday(&tim, NULL);

    double t1=tim.tv_sec+(tim.tv_usec/1000000.0);

    while (1){

        gettimeofday(&tim, NULL);

        double t2=tim.tv_sec+(tim.tv_usec/1000000.0);

        if (t2-t1 >= seconds)

            break;

    }

}