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

/* last modified 01/22/01 */
/*
********************************************************************************
*                                                                              *
*   OutputMove() is responsible for converting the internal move format to a   *
*   string that can be displayed.  first, it simply converts the from/to       *
*   squares to fully-qualified algebraic (which includes O-O and O-O-O for     *
*   castling moves).  next, we try several "shortcut" forms and call           *
*   input_move(silent=1) to let it silently check the move for uniqueness.     *
*   as soon as we get a non-ambiguous move, we return that text string.        *
*                                                                              *
********************************************************************************
*/
char* OutputMove(TREE *tree, int move, int ply, int wtm) {
  static char text_move[10], new_text[10];
  int *mvp;
  char *text;
  static const char piece_names[8] = { ' ','P','N','K',' ','B','R','Q'};

  text=text_move;
/*
   check for null_move first
*/
  if (move == 0) {
    strcpy(text,"null");
    return(text);
  }
  do {
/*
   check for castling first
*/
    if ((Piece(move) == king) &&
        (abs(From(move)-To(move)) == 2)) {
      if (wtm) {
        if (To(move) == 2) strcpy(text_move,"O-O-O");
        else strcpy(text_move,"O-O");
      }
      else {
        if (To(move) == 58) strcpy(text_move,"O-O-O");
        else strcpy(text_move,"O-O");
      }
      break;
    }
/*
   not a castling move.  convert to fully-qualified algebraic form
   first.
*/
    text=new_text;
    if ((int) Piece(move) > pawn) *text++=piece_names[Piece(move)];
    *text++=(From(move) & 7)+'a';
    *text++=(From(move) / 8)+'1';
    if (Captured(move)) *text++='x';
    *text++=(To(move) & 7)+'a';
    *text++=(To(move) / 8)+'1';
    if (Promote(move)) {
      *text++='=';
      *text++=piece_names[Promote(move)];
    }
    *text='\0';
    strcpy(text_move,new_text);
    if (output_format > 0) break;
/*
   now, try some short forms.  if the moving piece is a pawn, and
   it is not capturing anything, simply try the destination square
   first: (e2e4->e4)
*/
    if (Piece(move) == pawn) {
      if (!Captured(move)) {
        strcpy(text_move,new_text+2);
        if (OutputGood(tree,text_move,ply,wtm)) break;
      }
/*
   if the move is a pawn capturing a piece, try the short-form for pawn
   capture moves: (e4xf5->exf5)
*/
      text_move[0]=new_text[0];
      strcpy(text_move+1,new_text+2);
      if (OutputGood(tree,text_move,ply,wtm)) break;
/*
   punt, return the fully-qualified move.
*/
      strcpy(text_move,new_text);
      break;
    }
/*
   if the move is a piece move, but not a capture, then try the short-
   form for non-capturing moves:  (Ng1f3->Nf3)
*/
    if (!Captured(move)) {
      text_move[0]=new_text[0];
      strcpy(text_move+1,new_text+3);
      if (OutputGood(tree,text_move,ply,wtm)) break;
/*
   now try to qualify with the origin file only: (Ng1f3->Ngf3)
*/
      text_move[0]=new_text[0];
      text_move[1]=new_text[1];
      strcpy(text_move+2,new_text+3);
      if (OutputGood(tree,text_move,ply,wtm)) break;
/*
   now try to qualify with the origin rank only: (Ng1f3->N1f3)
*/
      text_move[0]=new_text[0];
      strcpy(text_move+1,new_text+2);
      if (OutputGood(tree,text_move,ply,wtm)) break;
/*
   punt, return the fully-qualified move.
*/
      strcpy(text_move,new_text);
      break;
    }
    else {
/*
   if the move is a piece move, and a capture, then try the short-
   form for capturing moves:  (Ng1xf3->Nxf3)
*/
      text_move[0]=new_text[0];
      strcpy(text_move+1,new_text+3);
      if (OutputGood(tree,text_move,ply,wtm)) break;
/*
   next, try adding in the origin file: (Ng1xf3->Ngxf3)
*/
      text_move[0]=new_text[0];
      text_move[1]=new_text[1];
      strcpy(text_move+2,new_text+3);
      if (OutputGood(tree,text_move,ply,wtm)) break;
/*
   next, try adding in the origin rank: (Ng1xf3->N1xf3)
*/
      text_move[0]=new_text[0];
      strcpy(text_move+1,new_text+2);
      if (OutputGood(tree,text_move,ply,wtm)) break;
/*
   punt, return the fully-qualified move.
*/
      strcpy(text_move,new_text);
      break;
    }
  } while (0);
/*
   determine if it's a checking move, or if it's mate.  if so, 
   append "+" or "#" as appropriate.
*/
  text=text_move+strlen(text_move);
  tree->position[MAXPLY]=tree->position[ply];
  MakeMove(tree, MAXPLY, move, wtm);
  if (Check(ChangeSide(wtm))) {
    mvp=GenerateCheckEvasions(tree,MAXPLY+1, ChangeSide(wtm), tree->move_list+4800);
    if (mvp == (tree->move_list+4800))
      *text++='#';
    else
      *text++='+';
  }
  UnMakeMove(tree, MAXPLY, move, wtm);
  *text=0;
  return (text_move);
}

/* last modified 03/11/98 */
/*
********************************************************************************
*                                                                              *
*   OutputMoveICS() is responsible for producing the rather primitive move     *
*   format that the ics interface wants, namely [from][to][promote].           *
*                                                                              *
********************************************************************************
*/
char* OutputMoveICS(int move) {
  static char text_move[10];
  char *text;
  static const char piece_names[8] = { ' ','P','N','K',' ','B','R','Q'};

/*
   convert to fully-qualified algebraic form first.
*/
  text=text_move;
  *text++=(From(move) & 7)+'a';
  *text++=(From(move) / 8)+'1';
  *text++=(To(move) & 7)+'a';
  *text++=(To(move) / 8)+'1';
  if (Promote(move))
    *text++=piece_names[Promote(move)];
  *text='\0';
  return (text_move);
}

int OutputGood(TREE *tree, char* text, int ply, int wtm) {
  int new_move;
  new_move=InputMove(tree,text,ply,wtm,1,0);
  return (Piece(new_move));
}
