From 5acf21ded22dcbdb4ce3c02515a1982503e5cea3 Mon Sep 17 00:00:00 2001
From: the lemons <citrons@mondecitronne.com>
Date: Fri, 11 Feb 2022 01:16:51 -0600
Subject: nonfunctional tree code

---
 mods/vzxv_trees/init.lua    | 96 ++++++++++++++++++++++++++++++++++++++++++---
 mods/vzxv_worldgen/init.lua |  2 +
 2 files changed, 92 insertions(+), 6 deletions(-)

diff --git a/mods/vzxv_trees/init.lua b/mods/vzxv_trees/init.lua
index 5e60b9b..336465e 100644
--- a/mods/vzxv_trees/init.lua
+++ b/mods/vzxv_trees/init.lua
@@ -1,17 +1,101 @@
 
-vzxv.mundane_block("vzxv_trees:seed","Tree seed","moistdirt")
+vzxv.mundane_block("vzxv_trees:seed","Dirt","moistdirt")
 vzxv.mundane_block("vzxv_trees:root","Tree root",{"vzxvmoistdirt.png^vzxvroot.png"})
-vzxv.mundane_block("vzxv_trees:coreroot","Tree root",{"vzxvmoistdirt.png^vzxvroot.png"})
+vzxv.mundane_block("vzxv_trees:core","Tree root",{"vzxvmoistdirt.png^vzxvroot.png"})
 vzxv.mundane_block("vzxv_trees:trunk","Tree trunk", {
 	"vzxvlog.png","vzxvlog.png","vzxvbark.png"
 })
 
+local function traverse(pos, callback)
+	local traversed = {}
+	local depth = 0
+	local function t(pos)
+		depth = depth + 1
+		if depth > 500 then return end
+
+		local strpos = ('%s,%s,%s'):format(pos.x,pos.y,pos.z)
+		if traversed[strpos] then
+			return
+		else
+			traversed[strpos] = true
+		end
+
+		local node = minetest.get_node(pos)
+		if callback(pos, node) then
+			t{pos.x + 1, pos.y    , pos.z    }
+			t{pos.x - 1, pos.y    , pos.z    }
+			t{pos.x    , pos.y + 1, pos.z    }
+			t{pos.x    , pos.y - 1, pos.z    }
+			t{pos.x    , pos.y    , pos.z + 1}
+			t{pos.x    , pos.y    , pos.z - 1}
+		end
+	end
+	return t(pos)
+end
+
+local function update_tree(core_pos)
+	local core_meta = minetest.get_meta(core_pos)
+	local core = core_meta:to_table()
+	if not core or not core.live then
+		print "warning: attempt to update nonexistent tree"
+		return
+	end
+
+	local height = 0
+	while 1 do
+		local pos = {core_pos.x,core_pos.y+height+1,core_pos.z} 
+		local node = minetest.get_node(pos)
+		if node.name == "vzxv_trees:trunk" 
+				and minetest.get_meta(pos):contains "live" then
+			height = height + 1
+		else break end
+	end
+
+	if height == 0 then
+		-- die
+		minetest.set_node(core_pos,{name="vzxv_tree:root"})
+		return
+	end
+
+	local root_budget = 0
+	if core.prev_mass then
+		if math.log(core.prev_mass * 10) < (core.prev_mass / 5) + height * 2 then
+			root_budget = 5
+		elseif math.random(50) then
+		end
+	end
+
+	local root_mass = 0
+	traverse(pos, function(pos, node)
+		if node.name == "vzxv:root"
+				and minetest.get_meta(pos):contains "live" then
+			root_mass = root_mass + 1
+			return true
+		end
+	end)
+	core.prev = root_mass
+
+	local energy_generated = math.log(root_mass * 10)
+	local energy_cost = (root_mass / 5) + height * 2
+	core.energy = core.energy + energy_generated - energy_cost
+
+	core_meta:from_table(core)
+end
+
 function vzxv.generate_tree(pos)
-	minetest.set_node(pos,{name="vzxv:moistdirt"})
-	local height = math.random(16,32)
-	for i=1, height do
-		local node = minetest.get_node({x=pos.x,y=pos.y+i,z=pos.z})
+	local core_pos = {x=pos.x,y=pos.y-1,z=pos.z}
+	minetest.set_node(core_pos,{name="vzxv_trees:core"})
+	local core = minetest.get_meta(core_pos)
+
+	local height = math.random(8,20)
+	for i=0, height do
+		local p = {x=pos.x,y=pos.y+i,z=pos.z}
+		local node = minetest.get_node(p)
 		if node.name ~= "air" and node.name ~= "ignore" then return end
 		minetest.set_node({x=pos.x,y=pos.y+i,z=pos.z},{name="vzxv_trees:trunk"})
+		minetest.get_meta(p):set_int("live", 1)
 	end
+
+	core:from_table {energy=height*10,live=1}
 end
+
diff --git a/mods/vzxv_worldgen/init.lua b/mods/vzxv_worldgen/init.lua
index 65dd85d..2d1f70f 100644
--- a/mods/vzxv_worldgen/init.lua
+++ b/mods/vzxv_worldgen/init.lua
@@ -14,6 +14,8 @@ local water_level = 14
 local trees_tbg = {}
 -- chunks
 minetest.register_on_generated(function(minp,maxp,seed)
+	math.randomseed(seed)
+
 	local voxmn, vmin, vmax = minetest.get_mapgen_object("voxelmanip")
 	local va = VoxelArea:new{MinEdge=vmin,MaxEdge=vmax}
 
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