Initial start on improved monster pathing

The goal is to use the A* algorithm when pathing monsters to make them
smarter. Just need some tools to allow for the algorithm to perform
better.

Author: LiquidityC

src/monster.c

@@ -374,10 +374,13 @@ monster_drunk_walk(Monster *m, RoomMatrix *rm)
 static Direction
 get_optimal_move_towards(Monster *m, RoomMatrix *rm, const Position *dest)
 {
+	// TODO(Linus): Replace with A*
+
 	int x_dist, y_dist;
-	Position mPos;
+	const Position pPos = rm->playerRoomPos;
+	Position mPos = position_to_matrix_coords(&m->sprite->pos);
 
-	mPos = position_to_matrix_coords(&m->sprite->pos);
+	// TODO(Linus): Add a heap to track options
 
 	unsigned int currentScore = 100;
 	unsigned int chosenDirection = UP;

src/pos_heap.c

@@ -0,0 +1,37 @@
+/*
+ * BreakHack - A dungeone crawler RPG
+ * Copyright (C) 2025  Linus Probert <[email protected]>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "pos_heap.h"
+
+void pheap_init(PHeap *ph)
+{
+}
+
+
+void pheap_insert(PHeap *ph, Position p)
+{
+}
+
+void pheap_delete(PHeap *ph, Position p)
+{
+}
+
+Position pheap_peek(PHeap *ph)
+{
+	return ph->pos[0];
+}
+

src/pos_heap.h

@@ -0,0 +1,65 @@
+/*
+ * BreakHack - A dungeone crawler RPG
+ * Copyright (C) 2025  Linus Probert <[email protected]>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef _POS_HEAP_H_
+#define _POS_HEAP_H_
+
+#include "position.h"
+#include <stddef.h>
+
+typedef struct PHeap {
+	Position *pos;
+	size_t size;
+	size_t capacity;
+} PHeap;
+
+/**
+ * Initialize a PosHeap
+ *
+ * \param ph The heap to intialize
+ */
+void pheap_init(PHeap *ph);
+
+/**
+ * Insert a new position into the heap
+ *
+ * \param ph The heap to modify
+ * \param p  The value to insert
+ */
+void pheap_insert(PHeap *ph, Position p);
+
+/**
+ * Delete a position from a heap
+ *
+ * \param ph The heap to modify
+ * \param p  The position to delete
+ */
+void pheap_delete(PHeap *ph, Position p);
+
+/**
+ * Peek the first position in the heap
+ *
+ * Peek the top position in the heap. Peeking an empty heap is undefined
+ * behaviour.
+ *
+ * \param ph The heap to peek
+ * \returns The top element in the heap
+ */
+Position pheap_peek(PHeap *ph);
+
+#endif  // _POS_HEAP_H_
+