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;

}