Subversion Repositories connect-6

 
/*
 
connectk -- UMN CSci 5512W project
 
*/
 
//#include "config.h"
//#include <string.h>
//#include <glib.h>
#include "./shared.h"
#include "pico.h"
//#include "../connectk.h"
 
/* Variables required to check for cache hits */
//static int cache_id = -1, cache_depth = -1, cache_branch = -1;
//static SEARCH cache_search = -1;
//static AIMoves *cache_moves = NULL;
//static AIWEIGHT cache_best;
//static Player *cache_player;
//static AIFunc cache_func;
//static BCOORD cache_size;
 
int ai_stop=0;
static AIWEIGHT df_search(Board *b, AIMoves *moves,unsigned int *index, Player *player,
                          int depth, int cache_index,
                          PIECE searched, AIWEIGHT alpha, AIWEIGHT beta)
/* Depth is in _moves_ */
{
        int i, j;
 
        /* Halt and depth abort */
        if (ai_stop || depth < 1)
                return moves->utility;
 
        /* Alpha-beta sanity check */
        if (alpha >= beta) {
                //g_warning("DFS alpha-beta failed sanity check");
                return moves->utility;
        }
 
        /* Search only the top moves beyond the minimum */
        //aimoves_sort(moves);
        if (moves->len > player->branch) {
                for (i = player->branch; i < moves->len; i++)
                        if (moves->data[i].weight != moves->data[0].weight)
                                break;
                moves->len = i;
        }
 
        /* No moves left -- its a draw */
        if (moves->len < 1)
                return AIW_DRAW;
 
        /* Search each move available in depth first order */
        for (i = 0; i < moves->len; i++) {
                static Board b_next;
                AIMove *aim = moves->data + i;
                AIMoves moves_next;
 
                /* Did we get a bad move? */
                if (!piece_empty(piece_at(b, aim->x, aim->y))) {
                        //g_warning("DFS utility function suggested a bad move "
                                  //"(%s)", bcoords_to_string(aim->x, aim->y));
                        continue;
                }
 
                /* Already searched here? */
                if (piece_at(b, aim->x, aim->y) == searched)
                        continue;
                place_piece_type(b, aim->x, aim->y, searched);
 
                //b_next = board_new();
                board_copy(b, &b_next);
                place_piece(&b_next, aim->x, aim->y);
 
                /* Did we win? */
                if (check_win(&b_next, aim->x, aim->y))
                        aim->weight = AIW_WIN;
 
                /* Otherwise, search deeper */
                else  {
                        int next_ci = cache_index + 1;
                        AIWEIGHT next_alpha = alpha, next_beta = beta;
                        //AIFunc func;
 
                        b_next.moves_left--;
 
                        /* Player has changed */
                        if (b_next.moves_left <= 0) {
                                b_next.moves_left = place_p;
                                b_next.turn = other_player(b->turn);
                                next_ci += place_p;
                                searched++;
                                next_alpha = -beta;
                                next_beta = -alpha;
                        }
 
                        //func = ai(player->ai)->func;
                        //if (!func) {
                        //        g_warning("DFS player has no AI function");
                        //        return moves->utility;
                        //}
                        //moves_next = func(b_next);
			ai_threats(&b_next,&moves_next,index);
 
                        aim->weight = df_search(&b_next, &moves_next, index,player,
                                                depth - 1, next_ci, searched,
                                                next_alpha, next_beta);
                        //aimoves_free(moves_next);
                        if (b_next.turn != b->turn)
                                aim->weight = -aim->weight;
                }
 
                /* Debug search */
                //if (opt_debug_dfsc) {
                //        for(j = MAX_DEPTH - depth; j > 0; j--)
                //                //g_print("-");
                //        //g_print("> d=%d, %s, u=%d, a=%d, b=%d %s\n",
                //        //        depth, bcoords_to_string(aim->x, aim->y),
                //        //        aim->weight, alpha, beta,
                //        //        piece_to_string(b->turn));
                //}
 
                //board_free(b_next);
                if (aim->weight > alpha) {
                        alpha = aim->weight;
                        //cache_set(cache_index, aim);
 
                        /* Victory abort */
                        if (alpha >= AIW_WIN)
                                return AIW_WIN;
 
                        /* Alpha-beta pruning */
                        if (alpha >= beta)
                                return alpha;
                }
        }
 
        return alpha;
}
 
int  search(const Board *b, AIMove *move, Player *player)
{
	AIMoves moves;
        Board copy;
	unsigned int index[361]={0};
        //AIFunc move_func = ai(player->ai)->func;
 
        /* Player is not configured to search */
        //if (player->search == SEARCH_NONE)
        //        return;
 
        /* Moves list does not need to be searched */
        //if (moves->len <= b->moves_left) {
        ////        if (opt_debug_dfsc)
        ////                g_debug("DFS no choice abort");
        //        return;
        //}
 
        ///* Board size changed, cache is invalidated */
        //if (board_size != cache_size)
        //        cache_moves = NULL;
        //cache_size = board_size;
 
        ///* Cache hit, last or same board */
        //if (player->cache && cache_moves && cache_moves->len &&
        //    cache_search == player->search &&
        //    cache_depth == player->depth &&
        //    cache_player == player &&
        //    cache_func == move_func &&
        //    cache_branch == player->branch) {
        //        if (b->parent && cache_id == b->parent->ac.id) {
        //                aimoves_remove(cache_moves, b->parent->move_x,
        //                               b->parent->move_y);
        //                cache_id = b->ac.id;
        //        }
        //        if (cache_id == b->ac.id && cache_moves->len) {
        //                if (cache_moves->len) {
        //                        aimoves_copy(cache_moves, moves);
        //                        if (opt_debug_dfsc)
        //                                g_debug("DFS cache HIT");
        //                        return;
        //                }
        //                aimoves_free(cache_moves);
        //                cache_moves = NULL;
        //        }
        //}
 
        /* Cache miss */
        //if (opt_debug_dfsc)
        //        g_debug("DFS cache MISS");
        //cache_id = b->ac.id;
        //if (!cache_moves)
        //        cache_moves = aimoves_new();
        //cache_moves->len = 0;
        //cache_best = AIW_MIN;
        //copy = board_new();
        board_copy(b, &copy);
	ai_threats(&copy,&moves,&index[0]);
 
        //if (player->search == SEARCH_DFS) {
                df_search(&copy, &moves, &index[0],player, player->depth, 0,
                          PIECE_SEARCHED, AIW_LOSE, AIW_WIN);
	int ret_val;
	ret_val=aimoves_choose(&moves, move,&index[0]);
	if (!ret_val)
		return 0;
	else return 1;		
          //      if (cache_moves->len)
          //              aimoves_copy(cache_moves, moves);
        //} else {
        //        board_free(copy);
        //        g_warning("Unsupported search type %d", player->search);
        //        return;
        //}
        //board_free(copy);
 
        ///* Debug DFS search */
        //if (opt_debug_dfsc)
        //        dfs_cache_dump();
 
        ///* Save params so we can check if we have a hit later */
        //cache_player = player;
        //cache_search = player->search;
        //cache_depth = player->depth;
        //cache_branch = player->branch;
        //cache_func = move_func;
}