#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "chess.h"
#include "data.h"

/* last modified 05/19/97 */
/*
********************************************************************************
*                                                                              *
*   Analyze() is used to handle the "analyze" command.  this mode basically    *
*   puts Crafty into a "permanent pondering" state, where it reads a move from *
*   the input stream, and then "ponders" for the opposite side.  whenever a    *
*   move is entered, Crafty reads this move, updates the game board, and then  *
*   starts "pondering" for the other side.                                     *
*                                                                              *
********************************************************************************
*/
void Analyze() {
  int i, move, back_number, readstat=1;
  TREE *tree=local[0];
/*
 ----------------------------------------------------------
|                                                          |
|  initialize.                                             |
|                                                          |
 ----------------------------------------------------------
*/
    ponder_move=0;
    analyze_mode=1;
    if (!xboard) display_options|=1+2+4;
    printf("Analyze Mode: type \"exit\" to terminate.\n");
/*
 ----------------------------------------------------------
|                                                          |
|  now loop waiting on input, searching the current        |
|  position continually until a move comes in.             |
|                                                          |
 ----------------------------------------------------------
*/
    do {
      do {
        last_pv.path_iteration_depth=0;
        last_pv.path_length=0;
        analyze_move_read=0;
        pondering=1;
        tree->position[1]=tree->position[0];
        (void) Iterate(wtm,think,0);
        pondering=0;
        if (book_move) moves_out_of_book=0;
        if (!xboard) {
          if (wtm) printf("analyze.White(%d): ",move_number);
          else printf("analyze.Black(%d): ",move_number);
          fflush(stdout);
        }
        if (!analyze_move_read) do {
          readstat=Read(1,buffer);
          if (readstat < 0) break;
          nargs=ReadParse(buffer,args," 	;");
          Print(4095,"%s\n",buffer);
          if (strstr(args[0],"timeleft") && !xboard) {
            if (wtm) printf("analyze.White(%d): ",move_number);
            else printf("analyze.Black(%d): ",move_number);
            fflush(stdout);
          }
        } while (strstr(args[0],"timeleft"));
        else nargs=ReadParse(buffer,args," 	;");
        if (readstat < 0) break;
        move=0;
        if (!strcmp(args[0],"exit")) break;
        move=InputMove(tree,args[0],0,wtm,1,0);
        if (move) {
          fseek(history_file,((move_number-1)*2+1-wtm)*10,SEEK_SET);
          fprintf(history_file,"%9s\n",OutputMove(tree,&move,0,wtm));
          if (!xboard) {
            if (wtm) Print(128,"White(%d): ",move_number);
              else Print(128,"Black(%d): ",move_number);
            Print(128,"%s\n",OutputMove(tree,&move,0,wtm));
          }
          else {
            if (wtm) Print(128,"White(%d): ",move_number);
              else Print(128,"Black(%d): ",move_number);
            Print(128,"%s\n",OutputMove(tree,&move,0,wtm));
          }
          MakeMoveRoot(tree,move,wtm);
          display=tree->pos;
          last_mate_score=0;
        }
        else if (OptionMatch("back",args[0])) {
          if (nargs > 1) back_number=atoi(args[1]);
          else back_number=1;
          for (i=0;i<back_number;i++) {
            wtm=ChangeSide(wtm);
            if (ChangeSide(wtm)) move_number--;
          }
          if (move_number == 0) {
            move_number=1;
            wtm=1;
          }
          sprintf(buffer,"reset %d",move_number);
          (void) Option(tree);
          display=tree->pos;
        }
        else {
          pondering=0;
          if (Option(tree) == 0) printf("illegal move.\n");
          pondering=1;
          display=tree->pos;
        }
      } while (!move);
      if (readstat < 0 || !strcmp(args[0],"exit")) break;
      wtm=ChangeSide(wtm);
      if (wtm) move_number++;
    } while (1);
    analyze_mode=0;
    printf("analyze complete.\n");
    pondering=0;
}