#include "player.h"

int copybot ()
{
    /* do whatever would have beat the opponent last turn */
    return( (opp_history[opp_history[0]] + 1) % 3);
}

int freqbot ()
{
    /* play whatever will beat the opponent's most frequent choice */

    int i, rcount, pcount, scount;

    rcount = 0;  pcount = 0;  scount = 0;
    for (i = 1; i <= opp_history[0]; i++) {
        if (opp_history[i] == rock)            { rcount++; }
        else if (opp_history[i] == paper)      { pcount++; }
        else /* opp_history[i] == scissors */  { scount++; }
    }
    if ( (rcount > pcount) && (rcount > scount) ) { return(paper); }
    else if ( pcount > scount ) { return(scissors); }
    else { return(rock); }
}

int freqbot2 ()  /* based on code by Don Beal */
{
    /* maintain stats with static variables to avoid re-scanning the
       history array */

    static int rcount, pcount, scount;
    int opp_last;

    if( opp_history[0] == 0 ) {
        rcount = 0;  pcount = 0;  scount = 0;  }
    else {
      opp_last = opp_history[opp_history[0]];
      if ( opp_last == rock)          { rcount++; }
      else if ( opp_last == paper)    { pcount++; }
      else /* opp_last == scissors */ { scount++; }
    }
    if ( (rcount > pcount) && (rcount > scount) ) { return(paper); }
    else if ( pcount > scount ) { return(scissors); }
    else { return(rock); }
}

int r226bot ()
{
    /* play 20% rock, 20% paper, 60% scissors */
    return( biased_roshambo(0.2, 0.2));
}

int randbot ()
{
    /* generate action uniformly at random (optimal strategy) */
    return( random() % 3);
}

int rockbot ()
{
    /* "Good ole rock.  Nuthin' beats rock." */
    return(rock);
}

int rotatebot ()
{
    /* rotate choice each turn */
    return( my_history[0] % 3);
}

int switchbot ()
{
    /* never repeat the previous pick */
    if ( my_history[my_history[0]] == rock ) {
        return( biased_roshambo(0.0, 0.5) ); }
    else if ( my_history[my_history[0]] == paper ) {
        return( biased_roshambo(0.5, 0.0) ); }
    else return( biased_roshambo(0.5, 0.5) );
}