stealth_nvg_ps = {}
local particles_t = {}
local allow_upd = false
local nvg_dbg = false

local nvg_rank_chance = {
	["novice"] = 0,
	["trainee"] = 0,
	["experienced"] = 0.2,
	["professional"] = 0.2,
	["veteran"] = 0.5,
	["expert"] = 0.5,
	["master"] = 0.85,
	["legend"] = 1.0,
}

function actor_on_update()
	if not allow_upd then return end

	local hrs = level.get_time_hours() + level.get_time_minutes() / 60
	local is_night = (hrs > 21 or hrs < 5)

	for npc_id, _ in pairs(stealth_nvg_ps) do

		-- manage particles
		if not (particles_t[npc_id]) then
			particles_t[npc_id] = particles_object("stealth_nvg\\nvg_dot")
		end

		local npc = level.object_by_id(npc_id)
		local npc_is_stalker = npc and IsStalker(npc)
		-- play or move if stealth mcm, npc exist and night
		if stealth_mcm.get_config("nvg_val") > 0 and npc_is_stalker and is_night then
			play_or_move_particles(npc, particles_t[npc_id])
		-- stop playing if not stealth mcm or not night
		elseif (stealth_mcm.get_config("nvg_val") <= 0 or (not is_night)) then
			stop_if_playing(particles_t[npc_id])
		-- stop playing if not npc and remove key
		elseif (not npc_is_stalker) then
			stop_if_playing(particles_t[npc_id])
			stealth_nvg_ps[npc_id] = nil
			particles_t[npc_id] = nil
		end

	end

end

function play_or_move_particles(npc, particle_obj)
	local eye_bone_pos = vector():set(npc:bone_position("eyelid_1"))
	local npc_dir = vector():set(npc:direction())
	local eye_pos = eye_bone_pos:add(npc_dir:mul(0.1))
	eye_pos = vector():set(eye_pos.x, eye_pos.y + 0.05, eye_pos.z)
	-- play particle
	if not (particle_obj:playing()) then
		particle_obj:play_at_pos(eye_pos)
	-- move particle
	else
		particle_obj:move_to(eye_pos, VEC_ZERO)
	end

end

function stop_if_playing(particle_obj)
	if not particle_obj:playing() then return end
	particle_obj:stop()
end

-----------------------------------------
scuffed_sr_light_patch = sr_light.check_light
function sr_light.check_light(npc)
	local hrs = level.get_time_hours() + level.get_time_minutes() / 60
	local is_night = (hrs > 21 or hrs < 5)

	if not (stealth_mcm.get_config("nvg_val") > 0 and stealth_nvg_ps[npc:id()] and is_night) then
		return scuffed_sr_light_patch(npc)
	end

	local st = db.storage[npc:id()]
	local tg = time_global()
	if not (st) then pr("- blyat nvg") end

	if (st and st.srlight_timer and tg < st.srlight_timer) then
		return
	end
	st.srlight_timer = tg + 2000 + math.random(100)

	local torch = npc:object("device_torch")
	if (torch and torch:attachable_item_enabled()) then
		torch:enable_attachable_item(false)
	end

end

function npc_on_net_spawn(npc, se_obj)
	if not (string.find(se_obj:section_name(), "sim_default")) then return end

	CreateTimeEvent("nvg_spawn_delay_e_" .. se_obj.id, "nvg_spawn_delay_a_" .. se_obj.id, 1, function()
		local se_obj_rank_name = ranks.get_se_obj_rank_name(se_obj)
		local rank_val = se_obj_rank_name and nvg_rank_chance[se_obj_rank_name]
		if (not (stealth_nvg_ps[se_obj.id])) and (rank_val and math.random() <= rank_val) then
			stealth_nvg_ps[se_obj.id] = true
		end
		return true
	end)

end

function actor_on_first_update()		-- scared that keys will be removed from storage coz wont find game objects
	local correct_game_ver = GAME_VERSION and string.find(GAME_VERSION, "1.5.2")
	if (not correct_game_ver) or (stealth_mcm.get_config("nvg_val") <= 0) then
		empty_table(stealth_nvg_ps)
		return
	end

	for id, v in pairs(stealth_nvg_ps) do
		if type(v) ~= "boolean" then
			stealth_nvg_ps[id] = true
		end
	end

	CreateTimeEvent("delay_for_game_objects_e", "delay_for_game_objects_a", 1, function()
		allow_upd = true
		return true
	end)
end

function npc_on_death_callback(npc)
	-- remove keys if npc died
	if stealth_nvg_ps[npc:id()] then
		stealth_nvg_ps[npc:id()] = nil
	end

	if particles_t[npc:id()] then
		if particles_t[npc:id()]:playing() then
			particles_t[npc:id()]:stop()
		end
		particles_t[npc:id()] = nil
	end

end

function save_state(m_data)
	m_data.stealth_nvg_ps = stealth_nvg_ps
end

function load_state(m_data)
	stealth_nvg_ps = m_data.stealth_nvg_ps or {}
end

function pr(...)
	if not nvg_dbg then return end
	printf(...)
end

function on_game_start()
	RegisterScriptCallback("actor_on_update", actor_on_update)
	RegisterScriptCallback("npc_on_net_spawn", npc_on_net_spawn)
	RegisterScriptCallback("actor_on_first_update", actor_on_first_update)
	RegisterScriptCallback("npc_on_death_callback", npc_on_death_callback)
	RegisterScriptCallback("save_state", save_state)
	RegisterScriptCallback("load_state", load_state)
end