local _ = wesnoth.textdomain 'wesnoth-help'
local T = wml.tag

-- The feeding event code
wesnoth.game_events.add{
	name = "die",
	first_time_only = false,
	filter = {
		unit = { wml.tag['not']{ status = "unplagueable" } },
		second_unit = { ability = "feeding" },
	},
	action = function()
		local ec = wesnoth.current.event_context

		local u_killer = wesnoth.units.get(ec.x2, ec.y2)

		local u_killer_cfg = u_killer.__cfg
		for i,v in ipairs(wml.get_child(u_killer_cfg, "modifications"))do
			if v.tag == "object" and v.contents.feeding == true then
				local effect = wml.get_child(v.contents, "effect")
				effect.increase_total = effect.increase_total + 1
				u_killer_cfg.max_hitpoints = u_killer_cfg.max_hitpoints + 1
				u_killer_cfg.hitpoints = u_killer_cfg.hitpoints + 1
				wesnoth.units.to_map(u_killer_cfg, false)
				wesnoth.interface.float_label(ec.x2, ec.y2, _ "+1 max HP", "0,255,0")
				return
			end
		end
		-- reaching this point means that the unit didn't have the feedng object yet.
		u_killer:add_modification("object", {
			feeding = true,
			T.effect {
				apply_to = "hitpoints",
				increase_total = 1,
			},
		})
		u_killer.hitpoints = u_killer.hitpoints + 1
		wesnoth.interface.float_label(ec.x2, ec.y2, _ "+1 max HP", "0,255,0")
	end
}