+/*
+ * Global TODOs for now:
+ * - update the helper maps so it is a single bimap
+ * - make a data structure for relations
+ * - encode relations as a set of four relations for each move
+ */
+
+typedef struct {
+ int x;
+ int y;
+} xy;
+
+typedef struct {
+ int var[3];
+} bddvar;
+
+typedef struct {
+ xy key;
+ bddvar value;
+ UT_hash_handle hh;
+} xy_bddvar_map;
+
+typedef struct {
+ int key;
+ xy value;
+ UT_hash_handle hh;
+} bddvar_xy_map;
+
+typedef struct {
+ xy_bddvar_map *f;
+ bddvar_xy_map *t;
+} bimap;
+
+typedef struct {
+ BDD *rell;
+ BDD *relu;
+ BDD *relr;
+ BDD *reld;
+} rels;
+
+xy_bddvar_map *getxy(int x, int y, xy_bddvar_map *map)
+{
+ xy_bddvar_map k, *r = NULL;
+ memset(&k, 0, sizeof(xy_bddvar_map));
+ k.key.x = x;
+ k.key.y = y;
+ HASH_FIND(hh, map, &k.key, sizeof(xy), r);
+ return r;
+}
+
+bddvar_xy_map *getbdd(int key, bddvar_xy_map *map)
+{
+ bddvar_xy_map k, *r = NULL;
+ memset(&k, 0, sizeof(bddvar_xy_map));
+ k.key = key;
+ HASH_FIND(hh, map, &k.key, sizeof(int), r);
+ return r;
+}
+
+/*
+xy_bddvar_map *create_xy_bddvar_map(sokoban_screen *screen)
+{
+ int varcount = 0;
+ sokoban_screen *r;
+ xy_bddvar_map *xybdd = NULL;
+ for(r=screen; r != NULL; r = (sokoban_screen *)(r->hh.next)){
+ xy_bddvar_map *f = NULL;
+ //bddvar_xy_map *t = NULL;
+
+ f = (xy_bddvar_map *)malloc(sizeof(xy_bddvar_map));
+ memset(f, 0, sizeof(xy_bddvar_map));
+ f->key.x = r->coord.x;
+ f->key.y = r->coord.y;
+ f->value.var[0] = varcount;
+ f->value.var[1] = varcount + 1;
+ f->value.var[2] = varcount + 2;
+ HASH_ADD(hh, xybdd, key, sizeof(xy), f);
+ varcount = varcount + 3;
+ }
+ return xybdd;
+}
+
+bddvar_xy_map *create_bddvar_xy_map(sokoban_screen *screen)
+{
+ int varcount = 0;
+ sokoban_screen *r;
+ bddvar_xy_map *bddxy = NULL;
+ for(r=screen; r != NULL; r = (sokoban_screen *)(r->hh.next)){
+ for (int i = 0; i <3; i++){
+ bddvar_xy_map *f = NULL;
+ //bddvar_xy_map *t = NULL;
+
+ f = (bddvar_xy_map *)malloc(sizeof(bddvar_xy_map));
+ memset(f, 0, sizeof(bddvar_xy_map));
+ f->key = varcount + i;
+ f->value.x = r->coord.x;
+ f->value.y = r->coord.y;
+ HASH_ADD(hh, bddxy, key, sizeof(int), f);
+ }
+ varcount = varcount + 3;
+ }
+ return bddxy;
+}
+*/
+
+bimap *create_bimap_helper(sokoban_screen *screen)
+{
+ int varcount = 0;
+ sokoban_screen *r;
+ xy_bddvar_map *xybdd = NULL;
+ bddvar_xy_map *bddxy = NULL;
+ for(r=screen; r != NULL; r = (sokoban_screen *)(r->hh.next)){
+ xy_bddvar_map *f = NULL;
+ f = (xy_bddvar_map *)malloc(sizeof(xy_bddvar_map));
+ memset(f, 0, sizeof(xy_bddvar_map));
+ f->key.x = r->coord.x;
+ f->key.y = r->coord.y;
+ f->value.var[0] = varcount;
+ f->value.var[1] = varcount + 1;
+ f->value.var[2] = varcount + 2;
+ HASH_ADD(hh, xybdd, key, sizeof(xy), f);
+
+ for (int i = 0; i <3; i++){
+ bddvar_xy_map *t = NULL;
+ t = (bddvar_xy_map *)malloc(sizeof(bddvar_xy_map));
+ memset(t, 0, sizeof(bddvar_xy_map));
+ t->key = varcount + i;
+ t->value.x = r->coord.x;
+ t->value.y = r->coord.y;
+ HASH_ADD(hh, bddxy, key, sizeof(int), t);
+ }
+ varcount = varcount + 3;
+ }
+ bimap *bm = NULL;
+ bm = (bimap *)malloc(sizeof(bimap));
+ bm->f = xybdd;
+ bm->t = bddxy;
+ return bm;
+}
+
+int check_xy_exists(int x, int y, bimap *bm)
+{
+ int res = 0;
+ if (getxy(x, y, bm->f) != NULL) res = 1;
+ return res;
+}
+
+int check_space(int x, int y, direction d, int delta, bimap *bm)
+{
+ switch(d){
+ case LEFT: x = x - delta; break;
+ case UP: y = y - delta; break;
+ case RIGHT: x = x + delta; break;
+ case DOWN: y = y + delta; break;
+ }
+ return check_xy_exists(x, y, bm);
+}