From bb50b390d4b0669718eb9872d294256e026b42ca Mon Sep 17 00:00:00 2001
From: orwell96 <mono96.mml@gmail.com>
Date: Thu, 29 Sep 2016 08:20:06 +0200
Subject: add owner system to prevent random train destroying

---
 couple.lua | 19 ++++++++++++++++++-
 wagons.lua | 17 +++++++++++++++--
 2 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/couple.lua b/couple.lua
index 5e6d81b..a846c8b 100644
--- a/couple.lua
+++ b/couple.lua
@@ -26,9 +26,26 @@ minetest.register_entity("advtrains:discouple", {
 			self.object:remove()
 			return
 		end
+		self.object:set_armor_groups({immortal=1})
 	end,
 	get_staticdata=function() return "DISCOUPLE" end,
-	on_punch=function(self)
+	on_punch=function(self, player)
+		--only if player owns at least one wagon next to this
+		local own=player:get_player_name()
+		if self.wagon.owner and self.wagon.owner~=own then
+			local train=advtrains.trains[self.wagon.train_id]
+			local nextwgn_id=train.trainparts[self.wagon.pos_in_trainparts-1]
+			for aoi, le in pairs(minetest.luaentities) do
+				if le and le.is_wagon then
+					if le.unique_id==nextwgn_id then
+						if le.owner and le.owner~=own then
+							minetest.chat_send_player(own, "You need to own at least one neighboring wagon to destroy this couple.")
+							return
+						end
+					end
+				end
+			end
+		end
 		advtrains.split_train_at_wagon(self.wagon)--found in trainlogic.lua
 	end,
 	on_step=function(self, dtime)
diff --git a/wagons.lua b/wagons.lua
index 7511f5d..c0a2f77 100644
--- a/wagons.lua
+++ b/wagons.lua
@@ -17,7 +17,7 @@ local wagon={
 
 
 function wagon:on_rightclick(clicker)
-	print("[advtrains] wagon rightclick")
+	--print("[advtrains] wagon rightclick")
 	if not clicker or not clicker:is_player() then
 		return
 	end
@@ -64,6 +64,7 @@ function wagon:on_activate(staticdata, dtime_s)
 			self.unique_id=tmp.unique_id
 			self.train_id=tmp.train_id
 			self.wagon_flipped=tmp.wagon_flipped
+			self.owner=tmp.owner
 		end
 
 	end
@@ -106,6 +107,7 @@ function wagon:get_staticdata()
 		unique_id=self.unique_id,
 		train_id=self.train_id,
 		wagon_flipped=self.wagon_flipped,
+		owner=self.owner,
 	})
 end
 
@@ -114,6 +116,10 @@ function wagon:on_punch(puncher, time_from_last_punch, tool_capabilities, direct
 	if not puncher or not puncher:is_player() then
 		return
 	end
+	if self.owner and puncher:get_player_name()~=self.owner then
+		minetest.chat_send_player(puncher:get_player_name(), "This wagon is owned by "..self.owner..", you can't destroy it.")
+		return
+	end
 	
 	if minetest.setting_getbool("creative_mode") then
 		self:destroy()
@@ -361,7 +367,14 @@ function advtrains.register_wagon(sysname, traintype, prototype, desc, inv_img)
 			if not pointed_thing.type == "node" then
 				return
 			end
-			local le=minetest.env:add_entity(pointed_thing.under, "advtrains:"..sysname):get_luaentity()
+			local ob=minetest.env:add_entity(pointed_thing.under, "advtrains:"..sysname)
+			if not ob then
+				print("[advtrains]couldn't add_entity, aborting")
+			end
+			local le=ob:get_luaentity()
+			
+			le.owner=placer:get_player_name()
+			le.infotext=desc..", owned by "..placer:get_player_name()
 			
 			local node=minetest.env:get_node_or_nil(pointed_thing.under)
 			if not node then print("[advtrains]Ignore at placer position") return itemstack end
-- 
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