From 12a677d9007b93893fab0c223a297a5a5c207693 Mon Sep 17 00:00:00 2001
From: Nipun Garg
Date: Tue, 25 Jun 2019 00:31:03 +0530
Subject: HDB: Add legalMove functions

---
 engines/hdb/ai-funcs.cpp | 77 ++++++++++++++++++++++++++++++++++++++++++++++++
 engines/hdb/ai.h         |  4 ++-
 2 files changed, 80 insertions(+), 1 deletion(-)

(limited to 'engines')

diff --git a/engines/hdb/ai-funcs.cpp b/engines/hdb/ai-funcs.cpp
index 4f6bf35a2b..4d265d1e8d 100644
--- a/engines/hdb/ai-funcs.cpp
+++ b/engines/hdb/ai-funcs.cpp
@@ -1375,6 +1375,83 @@ int AI::checkForTouchplate(int x, int y) {
 	return 0;
 }
 
+AIEntity *AI::legalMove(int tileX, int tileY, int level, int *result) {
+	uint32 bgFlags = g_hdb->_map->getMapBGTileFlags(tileX, tileY);
+	uint32 fgFlags = g_hdb->_map->getMapFGTileFlags(tileX, tileY);
+	AIEntity *hit = findEntity(tileX, tileY);
+
+	if (hit && hit->state != STATE_FLOATING)
+		// If player and entity are not at the same level, are they on stairs?
+		if (hit->level != level)
+			if (level == 1 && !(bgFlags & kFlagStairTop))
+				hit = NULL;
+			else if (level == 1 && !(bgFlags & kFlagStairBot))
+				hit = NULL;
+
+	if (level == 1) {
+		if (bgFlags & kFlagSolid) {
+			*result = 0;
+			return hit;
+		}
+
+		if (bgFlags & (kFlagWater | kFlagSlime)) {
+			if (hit && hit->state == STATE_FLOATING) {
+				*result = 1;
+				return NULL;
+			} else
+				*result = 0;
+			return hit;
+		} else
+			*result = 1;
+	} else {
+		if (fgFlags & kFlagSolid) {
+			*result = 0;
+			return hit;
+		} else if (fgFlags & kFlagGrating) {
+			*result = 1;
+			return hit;
+		} else if (fgFlags & kFlagSolid) {
+			*result = 0;
+			return hit;
+		}
+
+		if (bgFlags & (kFlagWater | kFlagSlime | kFlagPlummet)) {
+			if (hit && hit->state == STATE_FLOATING) {
+				*result = 1;
+				return NULL;
+			} else
+				*result = 0;
+			return hit;
+		} else
+			*result = 1;
+	}
+	return hit;
+}
+
+AIEntity *AI::legalMoveOverWater(int tileX, int tileY, int level, int *result) {
+	uint32 bgFlags = g_hdb->_map->getMapBGTileFlags(tileX, tileY);
+	uint32 fgFlags = g_hdb->_map->getMapFGTileFlags(tileX, tileY);
+	AIEntity *hit = findEntity(tileX, tileY);
+
+	if (level == 1 ? (bgFlags & kFlagMonsterBlock) : (!(fgFlags &kFlagGrating) && ((fgFlags & kFlagSolid) || (bgFlags & kFlagMonsterBlock))))
+		*result = 0;
+	else
+		*result = 1;
+	return hit;
+}
+
+AIEntity *AI::legalMoveOverWaterIgnore(int tileX, int tileY, int level, int *result, AIEntity *ignore) {
+	uint32 bgFlags = g_hdb->_map->getMapBGTileFlags(tileX, tileY);
+	uint32 fgFlags = g_hdb->_map->getMapFGTileFlags(tileX, tileY);
+	AIEntity *hit = findEntityIgnore(tileX, tileY, ignore);
+
+	if (level == 1 ? (bgFlags & kFlagMonsterBlock) : (!(fgFlags &kFlagGrating) && ((fgFlags & kFlagSolid) || (bgFlags & kFlagMonsterBlock))))
+		*result = 0;
+	else
+		*result = 1;
+	return hit;
+}
+
 bool AI::checkFloating(int x, int y) {
 	for (Common::Array<AIEntity *>::iterator it = _floats->begin(); it != _floats->end(); it++) {
 		if ((*it)->tileX == x && (*it)->tileY == y)
diff --git a/engines/hdb/ai.h b/engines/hdb/ai.h
index e228ebd499..04c20187d3 100644
--- a/engines/hdb/ai.h
+++ b/engines/hdb/ai.h
@@ -646,7 +646,9 @@ public:
 	void moveEnts();
 
 	int checkForTouchplate(int x, int y);
-
+	AIEntity *legalMove(int tileX, int tileY, int level, int *result);
+	AIEntity *legalMoveOverWater(int tileX, int tileY, int level, int *result);
+	AIEntity *legalMoveOverWaterIgnore(int tileX, int tileY, int level, int *result, AIEntity *ignore);
 	void addAnimateTarget(int x, int y, int start, int end, AnimSpeed speed, bool killAuto, bool inMap, const char *tileName);
 	void animateTargets();
 
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