-/* src/server/ai.c */
+/* src/server/ai.c
+ *
+ * This file is part of PlomRogue. PlomRogue is licensed under the GPL version 3
+ * or any later version. For details on its copyright, license, and warranties,
+ * see the file NOTICE in the root directory of the PlomRogue source package.
+ */
#include "ai.h"
-#include <stdint.h> /* uint8_t, uint16_t */
+#include <stdint.h> /* uint8_t, uint16_t, uint32_t, int16_t, UINT16_MAX */
#include <stdlib.h> /* free() */
-#include <string.h> /* strlen(), memset() */
#include "../common/try_malloc.h" /* try_malloc() */
-#include "../common/yx_uint16.h" /* struct yx_uint16 */
-#include "map_object_actions.h" /* get_moa_id_by_name() */
-#include "map_objects.h" /* struct MapObj */
-#include "world.h" /* global world */
-#include "yx_uint16.h" /* yx_uint16_cmp(), mv_yx_in_dir() */
+#include "hardcoded_strings.h" /* s */
+#include "rrand.h" /* rrand() */
+#include "thing_actions.h" /* get_thing_action_id_by_name() */
+#include "things.h" /* Thing, ThingType, ThingInMemory, get_thing_type() */
+#include "world.h" /* world */
+
+#define N_DIRS 6
+
+/* Return "score_map"["pos"] unless "check_inhabitant" and cell is inhabited. */
+static uint16_t set_neighbor_val(uint16_t * score_map, uint8_t check_inhabitant,
+ uint16_t kill_score, uint16_t pos);
+
+/* Write into "neighbors" scores of the N_DIRS immediate neighbors of the
+ * "score_map" cell at "pos_i" (array index), as found in the directions
+ * north-east, east, south-east etc. (clockwise order). Use "kill_score" for
+ * illegal neighborhoods (i.e. if direction would lead beyond the map's border,
+ * or, if "check_inhabitants" is non-zero, into animate-inhabited cell).
+ */
+static void get_neighbor_scores(uint16_t * score_map, uint16_t pos_i,
+ uint16_t kill_score, uint16_t * neighbors,
+ uint8_t check_inhabitants);
-/* Change cardinal direction string ("NNE" etc.) of any length >1 pointed to by
- * "path_ptr" one step clockwise ("NNE" -> "NEE", "NEE" -> "EEE" etc.).
+/* Iterate over scored cells in "score_map" of world.map's geometry. Compare
+ * each cell's score against the score of its immediate neighbors in N_DIRS
+ * directions. If any neighbor's score is at least two points lower than the
+ * current cell's score, re-set it to 1 point higher than its lowest-scored
+ * neighbor. Repeat this whole process until all cells have settled on their
+ * final score. Ignore cells whose score is greater than "max_score". Expect
+ * "max_score" to be the maximum score for cells, marking them as unreachable.
*/
-static void clockwise_path(char ** path_ptr);
+static void dijkstra_map(uint16_t * score_map, uint16_t max_score);
+
+/* Helpers to init_score_map(), realizing individual filters. */
+static uint8_t score_map_filter_attack(uint8_t filter, uint16_t * score_map,
+ struct Thing * t_eye);
+static uint8_t score_map_filter_flee(uint8_t filter, uint16_t * score_map,
+ struct Thing * t_eye);
+static uint8_t score_map_filter_consume(uint8_t filter, uint16_t * score_map,
+ struct Thing * t_eye);
+static uint8_t score_map_filter_search(uint8_t filter, uint16_t * score_map,
+ struct Thing * t_eye);
+
+/* get_dir_to_nearest_target() helper: Prepare "score_map" for dijkstra_map(). */
+static void init_score_map(char filter, uint16_t * score_map, uint32_t map_size,
+ struct Thing * t_eye);
+
+/* From "targets" select random "cmp" match as directory by order in "dirs". */
+static char rand_target_dir(char * dirs, uint16_t cmp, uint16_t * targets);
+
+/* Helper to get_dir_to_nearest_target(). */
+static char get_dir_from_neighbors(char filter, struct Thing * t_eye,
+ uint16_t * score_map);
+
+/* Set (if possible) as "t_eye"'s command a move to the path to the path-wise
+ * nearest target that is not "t_eye" and fits criteria set by "filter". On
+ * success, return !0, else 0. Values for "filter":
+ * "a": thing in FOV is below a certain distance, animate, but of a type that is
+ * not "t_eye"'s, and starts out weaker than it is; build path as avoiding
+ * things of "t_eye"'s type
+ * "f": neighbor cell (not inhabited by any animate thing) further away from
+ * animate thing not further than x steps away and in FOV and of a type
+ * that is not "t_eye"'s, and starts out stronger or as strong as "t_eye"
+ * is currently; or (cornered), if no such flight cell, but thing of above
+ * criteria is too near, a cell closer to it, or, if less near, just wait
+ * "c": thing in memorized map is consumable
+ * "s": memory map cell with greatest-reachable degree of unexploredness
+ */
+static uint8_t get_dir_to_nearest_target(struct Thing * t_eye, char filter);
+
+/* Return 1 if any thing not "t_eye" is known and fulfills some criteria defined
+ * by "filter", else 0. Values for "filter":
+ * "a" or "f": thing in FOV is animate, but of type that not that of "t_eye",
+ * and starts out weaker ("a") / stronger ("f") than "t_eye" is
+ * "c" : thing in memorized map is consumable
+ */
+static uint8_t seeing_thing(struct Thing * t_eye, char filter);
+
+/* Return slot ID of strongest consumable in "t_owner"'s inventory, else -1. */
+static int16_t get_inventory_slot_to_consume(struct Thing * t_owner);
+
+/* Return 1 if "t_standing" is standing on a consumable, else 0. */
+static uint8_t standing_on_consumable(struct Thing * t_standing);
+
+
+
+static uint16_t set_neighbor_val(uint16_t * score_map, uint8_t check_inhabitant,
+ uint16_t kill_score, uint16_t pos)
+{
+ if (check_inhabitant)
+ {
+ struct Thing * t = world.things;
+ for (; t; t = t->next)
+ {
+ if (t->lifepoints && pos == t->pos.y * world.map.length + t->pos.x)
+ {
+ return kill_score;
+ }
+ }
+ }
+ return score_map[pos];
+}
+
+
+
+static void get_neighbor_scores(uint16_t * score_map, uint16_t pos_i,
+ uint16_t kill_score, uint16_t * neighbors,
+ uint8_t check_inhabitants)
+{
+ uint32_t map_size = world.map.length * world.map.length;
+ uint8_t open_north = pos_i >= world.map.length;
+ uint8_t open_east = pos_i + 1 % world.map.length;
+ uint8_t open_south = pos_i + world.map.length < map_size;
+ uint8_t open_west = pos_i % world.map.length;
+ uint8_t is_indented = (pos_i / world.map.length) % 2;
+ uint8_t open_diag_west = is_indented || open_west;
+ uint8_t open_diag_east = !is_indented || open_east;
+ neighbors[0] = !(open_north && open_diag_east) ? kill_score :
+ set_neighbor_val(score_map, check_inhabitants, kill_score,
+ pos_i - world.map.length + is_indented);
+ neighbors[1] = !(open_east) ? kill_score :
+ set_neighbor_val(score_map, check_inhabitants, kill_score,
+ pos_i + 1);
+ neighbors[2] = !(open_south && open_diag_east) ? kill_score :
+ set_neighbor_val(score_map, check_inhabitants, kill_score,
+ pos_i + world.map.length + is_indented);
+ neighbors[3] = !(open_south && open_diag_west) ? kill_score :
+ set_neighbor_val(score_map, check_inhabitants, kill_score,
+ pos_i + world.map.length - !is_indented);
+ neighbors[4] = !(open_west) ? kill_score :
+ set_neighbor_val(score_map, check_inhabitants, kill_score,
+ pos_i - 1);
+ neighbors[5] = !(open_north && open_diag_west) ? kill_score :
+ set_neighbor_val(score_map, check_inhabitants, kill_score,
+ pos_i - world.map.length - !is_indented);
+}
+
+
+
+static void dijkstra_map(uint16_t * score_map, uint16_t max_score)
+{
+ uint32_t map_size = world.map.length * world.map.length;
+ uint32_t pos;
+ uint16_t i_scans, neighbors[N_DIRS], min_neighbor;
+ uint8_t scores_still_changing = 1;
+ uint8_t i_dirs;
+ for (i_scans = 0; scores_still_changing; i_scans++)
+ {
+ scores_still_changing = 0;
+ for (pos = 0; pos < map_size; pos++)
+ {
+ if (score_map[pos] <= max_score)
+ {
+ get_neighbor_scores(score_map, pos, max_score, neighbors, 0);
+ min_neighbor = max_score;
+ for (i_dirs = 0; i_dirs < N_DIRS; i_dirs++)
+ {
+ if (min_neighbor > neighbors[i_dirs])
+ {
+ min_neighbor = neighbors[i_dirs];
+ }
+ }
+ if (score_map[pos] > min_neighbor + 1)
+ {
+ score_map[pos] = min_neighbor + 1;
+ scores_still_changing = 1;
+ }
+ }
+ }
+ }
+}
+
+
-/* Return dir char (north = "N" etc.) to enemy nearest to "origin" (beeline). */
-static char nearest_enemy_dir(struct yx_uint16 origin);
+static uint8_t score_map_filter_attack(uint8_t filter, uint16_t * score_map,
+ struct Thing * t_eye)
+{
+ if ('a' != filter)
+ {
+ return 0;
+ }
+ struct Thing * t = world.things;
+ for (; t; t = t->next)
+ {
+ if ( t != t_eye && t->lifepoints && t->type != t_eye->type
+ && 'v' == t_eye->fov_map[t->pos.y*world.map.length + t->pos.x]
+ && get_thing_type(t->type)->lifepoints < t_eye->lifepoints)
+ {
+ score_map[t->pos.y * world.map.length + t->pos.x] = 0;
+ }
+ else if (t->type == t_eye->type)
+ {
+ score_map[t->pos.y * world.map.length + t->pos.x] = UINT16_MAX;
+ }
+ }
+ return 1;
+}
-static void clockwise_path(char ** path_ptr)
+static uint8_t score_map_filter_flee(uint8_t filter, uint16_t * score_map,
+ struct Thing * t_eye)
{
- char * path = * path_ptr;
- char old_char = path[0];
- char new_char = 'N';
- if ('N' == old_char)
+ if ('f' != filter)
{
- new_char = 'E';
+ return 0;
}
- else if ('E' == old_char)
+ struct Thing * t = world.things;
+ for (; t; t = t->next)
{
- new_char = 'S';
+ if ( t->lifepoints && t->type != t_eye->type
+ && 'v' == t_eye->fov_map[t->pos.y*world.map.length + t->pos.x]
+ && get_thing_type(t->type)->lifepoints >= t_eye->lifepoints)
+ {
+ score_map[t->pos.y * world.map.length + t->pos.x] = 0;
+ }
}
- else if ('S' == old_char)
+ return 1;
+}
+
+
+
+static uint8_t score_map_filter_consume(uint8_t filter, uint16_t * score_map,
+ struct Thing * t_eye)
+{
+ if ('c' != filter)
{
- new_char = 'W';
+ return 0;
}
- uint8_t len = strlen(path);
- uint8_t i = 0;
- for (; i < len; i++)
+ struct ThingInMemory * tm = t_eye->t_mem;
+ for (; tm; tm = tm->next)
{
- uint8_t next_i = i + 1;
- if (next_i == len || old_char != path[next_i])
+ if ( ' ' != t_eye->mem_map[tm->pos.y * world.map.length + tm->pos.x]
+ && get_thing_type(tm->type)->consumable)
{
- break;
+ score_map[tm->pos.y * world.map.length + tm->pos.x] = 0;
}
}
- path[i] = new_char;
+ return 1;
}
-static char nearest_enemy_dir(struct yx_uint16 origin)
+static uint8_t score_map_filter_search(uint8_t filter, uint16_t * score_map,
+ struct Thing * t_eye)
{
- char * f_name = "nearest_enemy_dir()";
- struct MapObj * mo;
- char sel = 0;
- uint16_t dist_max = world.map.size.y;
- if (world.map.size.x > world.map.size.y)
- {
- dist_max = world.map.size.x;
- }
- uint8_t escape = 0;
- uint8_t dist, j;
- uint16_t i;
- for (dist = 1; !escape && dist <= dist_max; dist++)
- {
- char * path = try_malloc(dist + 1, f_name);
- memset(path, 'N', dist);
- path[dist] = '\0';
- for (i = 0; !escape && i < (dist * 4); i++)
- {
- clockwise_path(&path);
- struct yx_uint16 testpos = origin;
- for (j = 0; j < dist; j++)
+ if (!(('0' < filter && '9' >= filter) || ' ' == filter))
+ {
+ return 0;
+ }
+ uint32_t i;
+ for (i = 0; i < (uint32_t) (world.map.length * world.map.length); i++)
+ {
+ score_map[i] = filter == t_eye->mem_depth_map[i] ? 0 : score_map[i];
+ }
+ return 1;
+}
+
+
+
+static void init_score_map(char filter, uint16_t * score_map, uint32_t map_size,
+ struct Thing * t_eye)
+{
+ uint32_t i;
+ for (i = 0; i < map_size; i++)
+ {
+ score_map[i] = UINT16_MAX;
+ if ('.' == t_eye->mem_map[i])
+ {
+ score_map[i] = UINT16_MAX-1;
+ }
+ }
+ if ( score_map_filter_attack(filter, score_map, t_eye)
+ || score_map_filter_flee(filter, score_map, t_eye)
+ || score_map_filter_consume(filter, score_map, t_eye)
+ || score_map_filter_search(filter, score_map, t_eye))
+ {
+ }
+}
+
+
+static char rand_target_dir(char * dirs, uint16_t cmp, uint16_t * targets)
+{
+ char candidates[N_DIRS];
+ uint8_t n_candidates = 0;
+ uint8_t i;
+ for (i = 0; i < N_DIRS; i++)
+ {
+ if (cmp == targets[i])
+ {
+ candidates[n_candidates] = dirs[i];
+ n_candidates++;
+ }
+ }
+ return n_candidates ? candidates[rrand() % n_candidates] : 0;
+}
+
+
+
+static char get_dir_from_neighbors(char filter, struct Thing * t_eye,
+ uint16_t * score_map)
+{
+ char dir_to_nearest_target = 0;
+ uint16_t pos_i = (t_eye->pos.y * world.map.length) + t_eye->pos.x;
+ char * dirs = "edcxsw"; /* get_neighbor_scores()'s clockwise dir order. */
+ uint16_t neighbors[N_DIRS];
+ get_neighbor_scores(score_map, pos_i, UINT16_MAX, neighbors, 'f'==filter);
+ uint16_t minmax_start = 'f' == filter ? 0 : UINT16_MAX-1;
+ uint16_t minmax_neighbor = minmax_start;
+ uint8_t i;
+ for (i = 0; i < N_DIRS; i++)
+ {
+ if ( ( 'f' == filter && score_map[pos_i] < neighbors[i]
+ && minmax_neighbor < neighbors[i] && UINT16_MAX != neighbors[i])
+ || ('f' != filter && minmax_neighbor > neighbors[i]))
+ {
+ minmax_neighbor = neighbors[i];
+ }
+ }
+ if (minmax_neighbor != minmax_start)
+ {
+ dir_to_nearest_target = rand_target_dir(dirs,minmax_neighbor,neighbors);
+ }
+ if ('f' == filter)
+ {
+ if (!dir_to_nearest_target)
+ {
+ if (1 == score_map[pos_i]) /* Attack if cornered too closely. */
{
- testpos = mv_yx_in_dir(path[j], testpos);
+ dir_to_nearest_target = rand_target_dir(dirs, 0, neighbors);
}
- if (yx_uint16_cmp(&testpos, &origin) ||
- testpos.y > world.map.size.y || testpos.x > world.map.size.x)
+ else if (3 >= score_map[pos_i]) /* If less closely, just wait. */
{
- continue;
+ t_eye->command = get_thing_action_id_by_name(s[S_CMD_WAIT]);
+ return 1;
}
- for (mo = world.map_objs; mo != 0; mo = mo->next)
+ }
+ else if (dir_to_nearest_target && 3 < score_map[pos_i]) /* Don't flee */
+ { /* enemy of */
+ dir_to_nearest_target = 0; /* a certain */
+ } /* distance. */
+ }
+ else if ('a' == filter && 10 <= score_map[pos_i])
+ {
+ dir_to_nearest_target = 0;
+ }
+ return dir_to_nearest_target;
+}
+
+
+
+static uint8_t get_dir_to_nearest_target(struct Thing * t_eye, char filter)
+{
+ char dir_to_nearest_target = 0;
+ uint8_t mem_depth_char = ' ';
+ uint8_t run_i = 's' == filter ? 9 /* max explored mem depth age */ + 1 : 1;
+ while ( run_i && !dir_to_nearest_target
+ && ('s' == filter || seeing_thing(t_eye, filter)))
+ {
+ run_i--;
+ uint32_t map_size = world.map.length * world.map.length;
+ uint16_t * score_map = try_malloc(map_size * sizeof(uint16_t),__func__);
+ init_score_map('s' == filter ? mem_depth_char : filter,
+ score_map, map_size, t_eye);
+ mem_depth_char = ' ' == mem_depth_char ? '9' : mem_depth_char - 1;
+ dijkstra_map(score_map, UINT16_MAX-1);
+ dir_to_nearest_target = get_dir_from_neighbors(filter,t_eye,score_map);
+ free(score_map);
+ if (dir_to_nearest_target)
+ {
+ t_eye->command = get_thing_action_id_by_name(s[S_CMD_MOVE]);
+ t_eye->arg = dir_to_nearest_target;
+ }
+ }
+ return dir_to_nearest_target;
+}
+
+
+
+static uint8_t seeing_thing(struct Thing * t_eye, char filter)
+{
+ if (t_eye->fov_map && ('a' == filter || 'f' == filter))
+ {
+ struct Thing * t = world.things;
+ for (; t; t = t->next)
+ {
+ if ( t != t_eye && t->lifepoints && t->type != t_eye->type
+ && 'v' == t_eye->fov_map[t->pos.y*world.map.length + t->pos.x])
{
- if (mo->lifepoints && 1 == yx_uint16_cmp(&testpos, &mo->pos))
+ struct ThingType * tt = get_thing_type(t->type);
+ if ( ('f' == filter && tt->lifepoints >= t_eye->lifepoints)
+ || ('a' == filter && tt->lifepoints < t_eye->lifepoints))
{
- sel = path[0];
- escape = 1;
- break;
+ return 1;
}
}
}
- free(path);
}
- return sel;
+ else if (t_eye->mem_map && 'c' == filter)
+ {
+ struct ThingInMemory * tm = t_eye->t_mem;
+ for (; tm; tm = tm->next)
+ {
+ if ( ' ' != t_eye->mem_map[tm->pos.y*world.map.length+tm->pos.x]
+ && get_thing_type(tm->type)->consumable)
+ {
+ return 1;
+ }
+ }
+ }
+ return 0;
}
-extern void pretty_dumb_ai(struct MapObj * mo)
+static int16_t get_inventory_slot_to_consume(struct Thing * t_owner)
{
- mo->command = get_moa_id_by_name("wait");
- char sel = nearest_enemy_dir(mo->pos);
- if (0 != sel)
+ uint8_t compare_consumability = 0;
+ int16_t selection = -1;
+ struct Thing * t = t_owner->owns;;
+ uint8_t i;
+ for (i = 0; t; t = t->next, i++)
{
- mo->command = get_moa_id_by_name("move");
- mo->arg = sel;
+ struct ThingType * tt = get_thing_type(t->type);
+ if (tt->consumable > compare_consumability)
+ {
+ compare_consumability = tt->consumable;
+ selection = i;
+ }
+ }
+ return selection;
+}
+
+
+
+static uint8_t standing_on_consumable(struct Thing * t_standing)
+{
+ struct Thing * t = world.things;
+ for (; t; t = t->next)
+ {
+ if ( t != t_standing
+ && t->pos.y == t_standing->pos.y && t->pos.x == t_standing->pos.x
+ && get_thing_type(t->type)->consumable)
+ {
+ return 1;
+ }
+ }
+ return 0;
+}
+
+
+
+extern void ai(struct Thing * t)
+{
+ t->command = get_thing_action_id_by_name(s[S_CMD_WAIT]);
+ if (!get_dir_to_nearest_target(t, 'f'))
+ {
+ int16_t sel = get_inventory_slot_to_consume(t);
+ if (-1 != sel)
+ {
+ t->command = get_thing_action_id_by_name(s[S_CMD_USE]);
+ t->arg = (uint8_t) sel;
+ }
+ else if (standing_on_consumable(t))
+ {
+ t->command = get_thing_action_id_by_name(s[S_CMD_PICKUP]);
+ }
+ else if ( !get_dir_to_nearest_target(t, 'c')
+ && !get_dir_to_nearest_target(t, 'a'))
+ {
+ get_dir_to_nearest_target(t, 's');
+ }
}
}