nodecore-cd2025/mods/nc_player_health/damage.lua

-- LUALOCALS < ---------------------------------------------------------
local minetest, nodecore, pairs
    = minetest, nodecore, pairs
-- LUALOCALS > ---------------------------------------------------------

minetest.register_on_player_hpchange(function(player, hp)
		local orig = player:get_hp()
		if player:get_armor_groups().immortal then
			return orig
		end
		if hp < 0 then
			player:get_meta():set_float("hurttime", nodecore.gametime)
			if nodecore.player_visible(player) then
				minetest.after(0, function()
						local now = player:get_hp()
						if now >= orig then return end
						nodecore.sound_play_except("player_damage", {
								pos = player:get_pos(),
								gain = 0.5
							}, player)
					end)
			end
		end
		if hp + orig <= 0 then
			hp = 1 - orig
			player:get_meta():set_float("dhp", -1)
		end
		return hp
	end,
	true
)

minetest.register_on_dieplayer(function(player)
		player:set_hp(1)
		player:get_meta():set_float("dhp", -1)
	end)

local function heal(player, dtime)
	if player:get_hp() <= 0 then return end
	if player:get_breath() <= 0 then return end
	local hurt = player:get_meta():get_float("hurttime")
	if hurt >= nodecore.gametime - 4 then return end
	nodecore.addphealth(player, dtime * 2)
end
minetest.register_globalstep(function(dtime)
		for _, player in pairs(minetest.get_connected_players()) do
			heal(player, dtime)
		end
	end)