From ac08c6991c0ce7f9bb8d9de5880ec64a7882c3e7 Mon Sep 17 00:00:00 2001
From: jordan4ibanez <jordan4ibanez@users.noreply.github.com>
Date: Tue, 20 Apr 2021 16:39:05 -0400
Subject: [PATCH] Add in detect_players_in_area

---
 .../mcl_mobs/api/mob_functions/ai.lua         |  9 ++-
 .../api/mob_functions/environment.lua         | 61 +++++++++++++++++++
 2 files changed, 69 insertions(+), 1 deletion(-)

diff --git a/mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua b/mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua
index 1c4046188..ae28c8cdb 100644
--- a/mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua
+++ b/mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua
@@ -597,7 +597,14 @@ mobs.mob_step = function(self, dtime)
 
 
 	if self.hostile then
-		print("I'm a bad boi")
+		--true for line_of_sight is debug
+		--10 for radius is debug
+		--1 for eye height adjust is debug
+		local attacking = mobs.detect_players_in_area(self,true,10,1)
+
+		if attacking then
+			print(attacking:get_player_name())
+		end
 	end
 
 	-- can mob be pushed, if so calculate direction -- do this last (overrides everything)
diff --git a/mods/ENTITIES/mcl_mobs/api/mob_functions/environment.lua b/mods/ENTITIES/mcl_mobs/api/mob_functions/environment.lua
index 082e88543..7935dc7cc 100644
--- a/mods/ENTITIES/mcl_mobs/api/mob_functions/environment.lua
+++ b/mods/ENTITIES/mcl_mobs/api/mob_functions/environment.lua
@@ -1,3 +1,7 @@
+local minetest_line_of_sight = minetest.line_of_sight
+
+local vector_new = vector.new
+
 -- default function when mobs are blown up with TNT
 local do_tnt = function(obj, damage)
 
@@ -9,4 +13,61 @@ local do_tnt = function(obj, damage)
 	return false, true, {}
 end
 
+--a fast function to be able to detect only players without using objects_in_radius
+mobs.detect_players_in_area = function(self, line_of_sight, radius, object_height_adder)
+	
+	line_of_sight = line_of_sight or true --fallback line_of_sight
+	radius = radius or 10 -- fallback radius
+	object_height_adder = object_height_adder or 0 --fallback entity (y height) addition for line of sight
 
+	local pos1 = self.object:get_pos()
+	local players_in_area = {}
+	local winner_player = nil
+	local players_detected = 0
+
+	--get players in radius
+	for _,player in pairs(minetest.get_connected_players()) do
+		if player and player:get_hp() > 0 then
+
+			local pos2 = player:get_pos()
+
+			local distance = vector.distance(pos1,pos2)
+
+			if distance <= radius then
+				if line_of_sight then
+					--must add eye height or stuff breaks randomly because of
+					--seethrough nodes being a blocker (like grass)
+					if minetest_line_of_sight(
+							vector_new(pos1.x, pos1.y + object_height_adder, pos1.z), 
+							vector_new(pos2.x, pos2.y + player:get_properties().eye_height, pos2.z)
+						) then
+						players_detected = players_detected + 1
+						players_in_area[player] = distance
+					end
+				else
+					players_detected = players_detected + 1
+					players_in_area[player] = distance
+				end
+			end
+		end
+	end
+
+
+	--return if there's no one near by
+	if players_detected <= 0 then --handle negative numbers for some crazy error that could possibly happen
+		return nil
+	end
+
+	--do a default radius max
+	local shortest_disance = radius + 1
+
+	--sort through players and find the closest player
+	for player,distance in pairs(players_in_area) do
+		if distance < shortest_disance then
+			shortest_disance = distance
+			winner_player = player
+		end
+	end
+
+	return(winner_player)
+end