From f9ac9acb489fb4f9f2d2e427ce7048706a3adc02 Mon Sep 17 00:00:00 2001
From: capitalthree <alexbobp@gmail.com>
Date: Mon, 20 Nov 2023 10:28:20 -0600
Subject: [PATCH] partial/prototype capture behavior, and improved handling of
 caching when touching a group from multiple sides

---
 rules.lua | 59 +++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 42 insertions(+), 17 deletions(-)

diff --git a/rules.lua b/rules.lua
index bff8772..995d9b3 100644
--- a/rules.lua
+++ b/rules.lua
@@ -41,24 +41,47 @@ function handle_placement(pos)
     end
     our_stone = our_stone:sub(2, -1)
 
+    local captureses = {}
     local captured = false
     for i,v in pairs(neighbor_dirs(pos)) do
-        local node = check_position(pos + directions[v])
-        if node:byte(1) == S then
-            if not (node:sub(2, -1) == our_stone) then
-                local captures = check_captures(pos + directions[v])
-                if not (#captures == 0) then
-                    minetest.chat_send_all("You gotcher self a capture right there!  size: "..#captures)
-                    captured = true
-                end
+        local new_pos = pos + directions[v]
+
+        local hash = minetest.hash_node_position(new_pos)
+
+        local checked = false
+        for i2,v2 in pairs(captureses) do
+            if v2.stones[hash] then
+                checked = true
+            end
+        end
+
+        if not checked then
+            local node = check_position(new_pos)
+            if (node:byte(1) == S) and (not (node:sub(2, -1) == our_stone)) then
+                local captures = check_captures(new_pos)
+                captured = captured or captures.capture
+                captureses[#captureses+1] = captures
             end
         end
     end
 
-    if not captured then
+    if captured then
+        for i,v in pairs(captureses) do
+            if v.capture then
+                local proximal = {}
+
+                for i2, v2 in pairs(v.stones) do
+                    nodecore.set_loud(v2, {name = "nc_fire:fire"})
+                end
+
+                -- todo: spawn itemstack of captured stones somehow
+            end
+        end
+    else
         local captures = check_captures(pos)
-        if not (#captures == 0) then
-            minetest.chat_send_all("You gotcher self a suicide move right there!  size: "..#captures)
+        if captures.capture then
+            minetest.chat_send_all("You gotcher self a suicide move right there!  size: "..#(captures.stones))
+            -- todo: replace with itemstack of one stone
         end
     end
 end
@@ -155,7 +178,8 @@ no captures.
 --]]
 function check_captures(pos)
     local group = {pos}
-    local checked = {[minetest.hash_node_position(pos)] = true}
+    local stones = {[minetest.hash_node_position(pos)] = pos}
+    local checked = {}
     local team = check_position(pos):sub(2,-1)
 
     local probe = 0
@@ -167,22 +191,23 @@ function check_captures(pos)
             local newpos = pos + directions[v]
             local newhash = minetest.hash_node_position(newpos)
 
-            if not checked[newhash] then
-                checked[newhash] = true
-
+            if (not stones[newhash]) and (not checked[newhash]) then
                 local newnode = check_position(newpos)
 
                 if newnode:byte(1) == E then
-                    return {}
+                    return {capture = false, stones = stones}
                 elseif newnode:byte(1) == S and
                         newnode:sub(2, -1) == team then
+                    stones[newhash] = newpos
                     group[#group+1] = newpos
+                else
+                    checked[newhash] = true
                 end
             end
         end
     end
 
-    return group
+    return {capture = true, stones = stones}
 end