From f06d5a1ee324f3416f83c8ca24d044b56e944415 Mon Sep 17 00:00:00 2001
From: cora <coradelamouche@gmx.ch>
Date: Sat, 22 Oct 2022 23:36:23 +0200
Subject: [PATCH] Add event api

prototype state, test with chatcommand /infest (debug priv)
---
 mods/CORE/mcl_events/init.lua | 127 ++++++++++++++++++++++++++++++++++
 mods/CORE/mcl_events/mod.conf |   3 +
 2 files changed, 130 insertions(+)
 create mode 100644 mods/CORE/mcl_events/init.lua
 create mode 100644 mods/CORE/mcl_events/mod.conf

diff --git a/mods/CORE/mcl_events/init.lua b/mods/CORE/mcl_events/init.lua
new file mode 100644
index 000000000..164dfdaa1
--- /dev/null
+++ b/mods/CORE/mcl_events/init.lua
@@ -0,0 +1,127 @@
+mcl_events = {}
+mcl_events.registered_events = {}
+local active_events = {}
+
+local tpl_eventdef = {
+	stage = 1,
+	max_stage = 1,
+	--pos = vector.zero(),
+	--time_start = 0,
+	completed = false,
+	cond_start = function(event) end, --return table of positions
+	on_step = function(event) end,
+	on_start = function(event) end,
+	on_stage_begin = function(event) end,
+	cond_progress = function(event) end, --return next stage
+	cond_complete = function(event) end, --return success
+}
+
+function mcl_events.register_event(name,def)
+	mcl_events.registered_events[name] = {}
+	--setmetatable(mcl_events.registered_events[name],tpl_eventdef)
+	mcl_events.registered_events[name] = def
+	mcl_events.registered_events[name].name = name
+end
+
+local function start_event(p,e)
+	minetest.log("event started: "..e.name.." at "..minetest.pos_to_string(p))
+	local idx = #active_events + 1
+	active_events[idx] = table.copy(e)
+	setmetatable(active_events[idx],e)
+	active_events[idx].pos = vector.copy(p)
+	active_events[idx].stage = 1
+	active_events[idx].time_start = os.time()
+	active_events[idx]:on_start(p)
+end
+
+local function finish_event(self,idx)
+	minetest.log("event finished: "..self.name.." at "..minetest.pos_to_string(self.pos))
+	if self.on_complete then self:on_complete() end
+	table.remove(active_events,idx)
+end
+
+local etime = 0
+function check_events(dtime)
+	for idx,ae in pairs(active_events) do
+		if ae.cond_complete and ae:cond_complete() then
+			finish_event(ae,idx)
+		elseif ae.max_stage and ae.max_stage < ae.stage then
+			finish_event(ae,idx)
+		elseif ae.cond_progress then
+			local p = ae:cond_progress()
+			if p == true then
+				ae.stage = ae.stage + 1
+				minetest.log("event progressed to stage "..ae.stage)
+				ae:on_stage_begin()
+			elseif tonumber(p) then
+				ae.stage = tonumber(p) or ae.stage + 1
+				minetest.log("event progressed to stage "..ae.stage)
+				ae:on_stage_begin()
+			end
+
+		elseif ae.on_step then
+			ae:on_step()
+		end
+	end
+	etime = etime - dtime
+	if etime > 0 then return end
+	etime = 10
+	for _,e in pairs(mcl_events.registered_events) do
+		local pp = e.cond_start()
+		if pp then
+			for _,p in pairs(pp) do
+				start_event(p,e)
+			end
+		end
+	end
+end
+
+minetest.register_globalstep(check_events)
+
+mcl_events.register_event("infestation",{
+	max_stage = 5,
+	cond_start  = function(self)
+		local r = {}
+		for _,p in pairs(minetest.get_connected_players()) do
+			if p:get_meta():get_string("infestation-omen") == "yes" then
+				p:get_meta():set_string("infestation-omen","")
+				table.insert(r,p:get_pos())
+			end
+		end
+		if #r > 0 then return r end
+	end,
+	on_start = function(self)
+		self.mobs = {}
+		minetest.log("inf")
+	end,
+	cond_progress = function(self)
+		local m = {}
+		for k,o in pairs(self.mobs) do
+			if o and o:get_pos() then table.insert(m,o) end
+		end
+		if #m < 1 then
+			minetest.log("INFESTATION stage "..self.stage.." completed")
+			return true end
+		self.mobs = m
+	end,
+	on_stage_begin = function(self)
+		minetest.log("event "..self.name.." stage "..self.stage.." begin...")
+		for i=1,5 * self.stage do
+			local m = mcl_mobs.spawn(vector.add(self.pos,vector.new(math.random(20)-10,0,math.random(20)-10)),"mobs_mc:silverfish")
+			if m then
+				table.insert(self.mobs,m)
+			end
+		end
+	end,
+	on_complete = function(self)
+		minetest.log("INFESTATION complete")
+	end,
+})
+
+minetest.register_chatcommand("infest",{
+	privs = {debug = true},
+	func = function(n,param)
+		local p = minetest.get_player_by_name(n)
+		p:get_meta():set_string("infestation-omen","yes")
+	end,
+})
diff --git a/mods/CORE/mcl_events/mod.conf b/mods/CORE/mcl_events/mod.conf
new file mode 100644
index 000000000..a69f0a303
--- /dev/null
+++ b/mods/CORE/mcl_events/mod.conf
@@ -0,0 +1,3 @@
+name = mcl_events
+author = cora
+depends = mcl_mobs