VoxeLibre/mods/ITEMS/mcl_potions/potions.lua

local S = minetest.get_translator(minetest.get_current_modname())

local function potion_image(colorstring, opacity)
	if not opacity then
		opacity = 127
	end
	return "mcl_potions_potion_overlay.png^[colorize:"..colorstring..":"..tostring(opacity).."^mcl_potions_potion_bottle.png"
end

local how_to_drink = S("Use the “Place” key to drink it.")
local potion_intro = S("Drinking a potion gives you a particular effect or set of effects.")

local function time_string(dur)
	if not dur then
		return nil
	end
	return math.floor(dur/60)..string.format(":%02d",math.floor(dur % 60))
end
local function perc_string(num)

	local rem = math.floor((num-1.0)*100 + 0.1) % 5
	local out = math.floor((num-1.0)*100 + 0.1) - rem

	if (num - 1.0) < 0 then
		return out.."%"
	else
		return "+"..out.."%"
	end
end


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function return_on_use(def, effect, dur)
	return function (itemstack, user, pointed_thing)
		if pointed_thing.type == "node" then
			if user and not user:get_player_control().sneak then
				-- Use pointed node's on_rightclick function first, if present
				local node = minetest.get_node(pointed_thing.under)
				if user and not user:get_player_control().sneak then
					if minetest.registered_nodes[node.name] and minetest.registered_nodes[node.name].on_rightclick then
						return minetest.registered_nodes[node.name].on_rightclick(pointed_thing.under, node, user, itemstack) or itemstack
					end
				end
			end
		elseif pointed_thing.type == "object" then
			return itemstack
		end

		--def.on_use(user, effect, dur) -- Will do effect immediately but not reduce item count until eating delay ends which makes it exploitable by deliberately not finishing delay

		-- Wrapper for handling mcl_hunger delayed eating
		local name = user:get_player_name()
		mcl_hunger.eat_internal[name]._custom_itemstack = itemstack -- Used as comparison to make sure the custom wrapper executes only when the same item is eaten
		mcl_hunger.eat_internal[name]._custom_var = {
			user = user,
			effect = effect,
			dur = dur,
		}
		mcl_hunger.eat_internal[name]._custom_func = def.on_use
		mcl_hunger.eat_internal[name]._custom_wrapper = function(name)

			mcl_hunger.eat_internal[name]._custom_func(
				mcl_hunger.eat_internal[name]._custom_var.user,
				mcl_hunger.eat_internal[name]._custom_var.effect,
				mcl_hunger.eat_internal[name]._custom_var.dur
			)
		end

		local old_name, old_count = itemstack:get_name(), itemstack:get_count()
		itemstack = minetest.do_item_eat(0, "mcl_potions:glass_bottle", itemstack, user, pointed_thing)
		if old_name ~= itemstack:get_name() or old_count ~= itemstack:get_count() then
			mcl_potions._use_potion(itemstack, user, def.color)
		end
		return itemstack
	end
end

local function generate_on_use(effects, color, on_use, custom_effect)
	return function(itemstack, user, pointed_thing)
		if pointed_thing.type == "node" then
			if user and not user:get_player_control().sneak then
				local node = minetest.get_node(pointed_thing.under)
				if minetest.registered_nodes[node.name] and minetest.registered_nodes[node.name].on_rightclick then
					return minetest.registered_nodes[node.name].on_rightclick(pointed_thing.under, node, user, itemstack) or itemstack
				end
			end
		elseif pointed_thing.type == "object" then
			return itemstack
		end

		local potency = itemstack:get_meta():get_int("mcl_potions:potion_potent")
		local plus = itemstack:get_meta():get_int("mcl_potions:potion_plus")
		local ef_level
		local dur
		for name, details in pairs(effects) do
			if details.uses_level then
				ef_level = details.level + details.level_scaling * (potency)
			else
				ef_level = details.level
			end
			if details.dur_variable then
				dur = details.dur * math.pow(mcl_potions.PLUS_FACTOR, plus)
				if potency>0 and details.uses_level then
					dur = dur / math.pow(mcl_potions.POTENT_FACTOR, potency)
				end
			else
				dur = details.dur
			end
			mcl_potions.give_effect_by_level(name, user, ef_level, dur)
		end

		if on_use then on_use(user, potency+1) end
		if custom_effect then custom_effect(user, potency+1) end

		itemstack = minetest.do_item_eat(0, "mcl_potions:glass_bottle", itemstack, user, pointed_thing)
		if itemstack then mcl_potions._use_potion(user, color) end

		return itemstack
	end
end

-- API - registers a potion
-- required parameters in def:
-- name - string - potion name in code
-- optional parameters in def:
-- desc_prefix - translated string - part of visible potion name, comes before the word "Potion"
-- desc_suffix - translated string - part of visible potion name, comes after the word "Potion"
-- _tt - translated string - custom tooltip text
-- _dynamic_tt - function(level) - returns custom tooltip text dependent on potion level
-- _longdesc - translated string - text for in-game documentation
-- stack_max - int - max stack size - defaults to 1
-- image - string - name of a custom texture of the potion icon
-- color - string - colorstring for potion icon when image is not defined - defaults to #0000FF
-- groups - table - item groups definition for the regular potion, not splash or lingering -
--   - must contain _mcl_potion=1 for tooltip to include dynamic_tt and effects
--   - defaults to {brewitem=1, food=3, can_eat_when_full=1, _mcl_potion=1}
-- nocreative - bool - adds a not_in_creative_inventory=1 group - defaults to false
-- _effect_list - table - all the effects dealt by the potion in the format of tables
-- -- the name of each sub-table should be a name of a registered effect, and fields can be the following:
-- -- -- uses_level - bool - whether the level of the potion affects the level of the effect -
-- -- --   - defaults to the uses_factor field of the effect definition
-- -- -- level - int - used as the effect level if uses_level is false and for lvl1 potions - defaults to 1
-- -- -- level_scaling - int - used as the number of effect levels added per potion level - defaults to 1 -
-- -- --   - this has no effect if uses_level is false
-- -- -- dur - float - duration of the effect in seconds - defaults to mcl_potions.DURATION
-- -- -- dur_variable - bool - whether variants of the potion should have the length of this effect changed -
-- -- --   - defaults to true
-- -- --   - if at least one effect has this set to true, the potion has a "plus" variant
-- uses_level - bool - whether the potion should come at different levels -
--   - defaults to true if uses_level is true for at least one effect, else false
-- drinkable - bool - defaults to true
-- has_splash - bool - defaults to true
-- has_lingering - bool - defaults to true
-- has_arrow - bool - defaults to false
-- has_potent - bool - whether there is a potent (e.g. II) variant - defaults to the value of uses_level
-- default_potent_level - int - potion level used for the default potent variant - defaults to 2
-- default_extend_level - int - extention level (amount of +) used for the default extended variant - defaults to 1
-- custom_on_use - function(user, level) - called when the potion is drunk, returns true on success
-- custom_effect - function(object, level) - called when the potion effects are applied, returns true on success
-- custom_splash_effect - function(pos, level) - called when the splash potion explodes, returns true on success
-- custom_linger_effect - function(pos, radius, level) - called on the lingering potion step, returns true on success
function mcl_potions.register_potion(def)
	local modname = minetest.get_current_modname()
	local name = def.name
	if name == nil then
		error("Unable to register potion: name is nil")
	end
	if type(name) ~= "string" then
		error("Unable to register potion: name is not a string")
	end
	local pdef = {}
	if def.desc_prefix and def.desc_suffix then
		pdef.description = S("@1 Potion @2", def.desc_prefix, def.desc_suffix)
	elseif def.desc_prefix then
		pdef.description = S("@1 Potion", def.desc_prefix)
	elseif def.desc_suffix then
		pdef.description = S("Potion @1", def.desc_suffix)
	else
		pdef.description = S("Strange Potion")
	end
	pdef._tt_help = def._tt
	pdef._dynamic_tt = def._dynamic_tt
	local potion_longdesc = def._longdesc
	if def._effect_list then
		potion_longdesc = potion_intro .. "\n" .. def._longdesc
	end
	pdef._doc_items_longdesc = potion_longdesc
	if def.drinkable ~= false then pdef._doc_items_usagehelp = how_to_drink end
	pdef.stack_max = def.stack_max or 1
	local color = def.color or "#0000FF"
	pdef.inventory_image = def.image or potion_image(color)
	pdef.wield_image = pdef.inventory_image
	pdef.groups = def.groups or {brewitem=1, food=3, can_eat_when_full=1, _mcl_potion=1}
	if def.nocreative then pdef.groups.not_in_creative_inventory = 1 end

	pdef._effect_list = {}
	local effect
	local uses_level = false
	local has_plus = false
	if def._effect_list then
		for name, details in pairs(def._effect_list) do
			no_effects = false
			effect = mcl_potions.registered_effects[name]
			if effect then
				local ulvl
				if details.uses_level ~= nil then ulvl = details.uses_level
				else ulvl = effect.uses_factor end
				if ulvl then uses_level = true end
				local durvar = true
				if details.dur_variable ~= nil then durvar = details.dur_variable end
				if durvar then has_plus = true end
				pdef._effect_list[name] = {
					uses_level = ulvl,
					level = details.level or 1,
					level_scaling = details.level_scaling or 1,
					dur = details.dur or mcl_potions.DURATION,
					dur_variable = durvar,
				}
			else
				error("Unable to register potion: effect not registered")
			end
		end
	end
	if def.uses_level ~= nil then uses_level = def.uses_level end
	pdef.uses_level = uses_level
	if def.has_potent ~= nil then pdef.has_potent = def.has_potent
	else pdef.has_potent = uses_level end
	pdef._default_potent_level = def.default_potent_level or 2
	pdef._default_extend_level = def.default_extend_level or 1
	pdef.has_plus = has_plus
	local on_use
	if def.drinkable ~= false then
		on_use = generate_on_use(pdef._effect_list, color, def.custom_on_use, def.custom_effect)
	end
	pdef.on_place = on_use
	pdef.on_secondary_use = on_use

	minetest.register_craftitem(modname..":"..name, pdef)

	if def.has_splash or def.has_splash == nil then
		local splash_desc = S("Splash @1", pdef.description)
		local sdef = {}
		sdef._tt = def._tt
		sdef._dynamic_tt = def._dynamic_tt
		sdef._longdesc = def._longdesc
		sdef.nocreative = def.nocreative
		sdef.stack_max = pdef.stack_max
		sdef._effect_list = pdef._effect_list
		sdef.uses_level = uses_level
		sdef.has_potent = pdef.has_potent
		sdef.has_plus = has_plus
		sdef._default_potent_level = pdef._default_potent_level
		sdef._default_extend_level = pdef._default_extend_level
		sdef.custom_effect = def.custom_effect
		sdef.on_splash = def.custom_splash_effect
		if not def._effect_list then sdef.instant = true end
		mcl_potions.register_splash(name, splash_desc, color, sdef)
	end

	if def.has_lingering or def.has_lingering == nil then
		local ling_desc = S("Lingering @1", pdef.description)
		local ldef = {}
		ldef._tt = def._tt
		ldef._dynamic_tt = def._dynamic_tt
		ldef._longdesc = def._longdesc
		ldef.nocreative = def.nocreative
		ldef.stack_max = pdef.stack_max
		ldef._effect_list = pdef._effect_list
		ldef.uses_level = uses_level
		ldef.has_potent = pdef.has_potent
		ldef.has_plus = has_plus
		ldef._default_potent_level = pdef._default_potent_level
		ldef._default_extend_level = pdef._default_extend_level
		ldef.custom_effect = def.custom_effect
		ldef.on_splash = def.custom_splash_effect
		ldef.while_lingering = def.custom_linger_effect
		if not def._effect_list then ldef.instant = true end
		mcl_potions.register_lingering(name, ling_desc, color, ldef)
	end

	if def.has_arrow then
		local arr_desc
		if def.desc_prefix and def.desc_suffix then
			arr_desc = S("@1 Arrow @2", def.desc_prefix, def.desc_suffix)
		elseif def.desc_prefix then
			arr_desc = S("@1 Arrow", def.desc_prefix)
		elseif def.desc_suffix then
			arr_desc = S("Arrow @1", def.desc_suffix)
		else
			arr_desc = S("Strange Tipped Arrow")
		end
		local adef = {}
		adef._tt = def._tt
		adef._dynamic_tt = def._dynamic_tt
		adef._longdesc = def._longdesc
		adef.nocreative = def.nocreative
		adef._effect_list = pdef._effect_list
		adef.uses_level = uses_level
		adef.has_potent = pdef.has_potent
		adef.has_plus = has_plus
		adef._default_potent_level = pdef._default_potent_level
		adef._default_extend_level = pdef._default_extend_level
		adef.custom_effect = def.custom_effect
		if not def._effect_list then adef.instant = true end
		mcl_potions.register_arrow(name, arr_desc, color, adef)
	end
end

mcl_potions.register_potion({
	name = "trolling",
	desc_prefix = S("Mighty"),
	desc_suffix = S("of Trolling"),
	_tt = "trololo",
	_dynamic_tt = function(level)
		return "trolololoooololo"
	end,
	_longdesc = "Trolololololo",
	stack_max = 2,
	color = "#00AA00",
	nocreative = true,
	_effect_list = {
		night_vision = {},
		strength = {},
		swiftness = {
			uses_level = false,
			level = 2,
		},
		poison = {
			dur = 10,
		},
	},
	default_potent_level = 5,
	default_extend_level = 3,
	custom_splash_effect = mcl_potions._extinguish_nearby_fire,
	has_arrow = true,
})



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minetest.register_craftitem("mcl_potions:dragon_breath", {
	description = S("Dragon's Breath"),
	_longdesc = S("This item is used in brewing and can be combined with splash potions to create lingering potions."),
	image = "mcl_potions_dragon_breath.png",
	groups = { brewitem = 1, bottle = 1 },
	stack_max = 64,
})

mcl_potions.register_potion({
	name = "awkward",
	desc_prefix = S("Awkward"),
	_tt = S("No effect"),
	_longdesc = S("Has an awkward taste and is used for brewing potions."),
	color = "#0000FF",
})

mcl_potions.register_potion({
	name = "mundane",
	desc_prefix = S("Mundane"),
	_tt = S("No effect"),
	_longdesc = S("Has a terrible taste and is not really useful for brewing potions."),
	color = "#0000FF",
})

mcl_potions.register_potion({
	name = "thick",
	desc_prefix = S("Thick"),
	_tt = S("No effect"),
	_longdesc = S("Has a bitter taste and is not really useful for brewing potions."),
	color = "#0000FF",
})

mcl_potions.register_potion({
	name = "healing",
	desc_suffix = S("of Healing"),
	_dynamic_tt = function(level)
		return S("+@1 HP", 4 * level)
	end,
	_longdesc = S("Instantly heals."),
	color = "#F82423",
	uses_level = true,
	has_arrow = true,
	custom_effect = function(object, level)
		return mcl_potions.healing_func(object, 4 * level)
	end,
})

mcl_potions.register_potion({
	name = "harming",
	desc_suffix = S("of Harming"),
	_dynamic_tt = function(level)
		return S("-@1 HP", 6 * level)
	end,
	_longdesc = S("Instantly deals damage."),
	color = "#430A09",
	uses_level = true,
	has_arrow = true,
	custom_effect = function(object, level)
		return mcl_potions.healing_func(object, -6 * level)
	end,
})

mcl_potions.register_potion({
	name = "night_vision",
	desc_suffix = S("of Night Vision"),
	_tt = nil,
	_longdesc = S("Increases the perceived brightness of light under a dark sky."),
	color = "#1F1FA1",
	_effect_list = {
		night_vision = {},
	},
	has_arrow = true,
})

mcl_potions.register_potion({
	name = "swiftness",
	desc_suffix = S("of Swiftness"),
	_tt = nil,
	_longdesc = S("Increases walking speed."),
	color = "#7CAFC6",
	_effect_list = {
		swiftness = {},
	},
	has_arrow = true,
})

mcl_potions.register_potion({
	name = "slowness",
	desc_suffix = S("of Slowness"),
	_tt = nil,
	_longdesc = S("Decreases walking speed."),
	color = "#5A6C81",
	_effect_list = {
		slowness = {dur=mcl_potions.DURATION_INV},
	},
	has_arrow = true,
})

mcl_potions.register_potion({
	name = "leaping",
	desc_suffix = S("of Leaping"),
	_tt = nil,
	_longdesc = S("Increases jump strength."),
	color = "#22FF4C",
	_effect_list = {
		leaping = {},
	},
	has_arrow = true,
})

mcl_potions.register_potion({
	name = "withering",
	desc_suffix = S("of Withering"),
	_tt = nil,
	_longdesc = S("Applies the withering effect which deals damage at a regular interval and can kill."),
	color = "#000000",
	_effect_list = {
		withering = {dur=mcl_potions.DURATION_POISON},
	},
	has_arrow = true,
})

mcl_potions.register_potion({
	name = "poison",
	desc_suffix = S("of Poison"),
	_tt = nil,
	_longdesc = S("Applies the poison effect which deals damage at a regular interval."),
	color = "#4E9331",
	_effect_list = {
		poison = {dur=mcl_potions.DURATION_POISON},
	},
	has_arrow = true,
})

mcl_potions.register_potion({
	name = "regeneration",
	desc_suffix = S("of Regeneration"),
	_tt = nil,
	_longdesc = S("Regenerates health over time."),
	color = "#CD5CAB",
	_effect_list = {
		regeneration = {dur=mcl_potions.DURATION_POISON},
	},
	has_arrow = true,
})

mcl_potions.register_potion({
	name = "invisibility",
	desc_suffix = S("of Invisibility"),
	_tt = nil,
	_longdesc = S("Grants invisibility."),
	color = "#7F8392",
	_effect_list = {
		invisibility = {},
	},
	has_arrow = true,
})

mcl_potions.register_potion({
	name = "water_breathing",
	desc_suffix = S("of Water Breathing"),
	_tt = nil,
	_longdesc = S("Grants limitless breath underwater."),
	color = "#2E5299",
	_effect_list = {
		water_breathing = {},
	},
	has_arrow = true,
})

mcl_potions.register_potion({
	name = "fire_resistance",
	desc_suffix = S("of Fire Resistance"),
	_tt = nil,
	_longdesc = S("Grants immunity to damage from heat sources like fire."),
	color = "#E49A3A",
	_effect_list = {
		fire_resistance = {},
	},
	has_arrow = true,
})



-- minetest.register_craftitem("mcl_potions:weakness", {
-- 	description = S("Weakness"),
-- 	_tt_help = TODO,
-- 	_doc_items_longdesc = brewhelp,
-- 	wield_image = potion_image("#484D48"),
-- 	inventory_image = potion_image("#484D48"),
-- 	groups = { brewitem=1, food=3, can_eat_when_full=1 },
-- 	stack_max = 1,
--
-- 	on_place = function(itemstack, user, pointed_thing)
-- 		mcl_potions.weakness_func(user, -4, mcl_potions.DURATION*mcl_potions.INV_FACTOR)
-- 		minetest.do_item_eat(0, "mcl_potions:glass_bottle", itemstack, user, pointed_thing)
-- 		mcl_potions._use_potion(itemstack, user, "#484D48")
-- 		return itemstack
-- 	end,
--
-- 	on_secondary_use = function(itemstack, user, pointed_thing)
-- 		mcl_potions.weakness_func(user, -4, mcl_potions.DURATION*mcl_potions.INV_FACTOR)
-- 		minetest.do_item_eat(0, "mcl_potions:glass_bottle", itemstack, user, pointed_thing)
-- 		mcl_potions._use_potion(itemstack, user, "#484D48")
-- 		return itemstack
-- 	end
-- })
--
-- minetest.register_craftitem("mcl_potions:weakness_plus", {
-- 	description = S("Weakness +"),
-- 	_tt_help = TODO,
-- 	_doc_items_longdesc = brewhelp,
-- 	wield_image = potion_image("#484D48"),
-- 	inventory_image = potion_image("#484D48"),
-- 	groups = { brewitem=1, food=3, can_eat_when_full=1 },
-- 	stack_max = 1,
--
-- 	on_place = function(itemstack, user, pointed_thing)
-- 		mcl_potions.weakness_func(user, -4, mcl_potions.DURATION_2*mcl_potions.INV_FACTOR)
-- 		minetest.do_item_eat(0, "mcl_potions:glass_bottle", itemstack, user, pointed_thing)
-- 		mcl_potions._use_potion(itemstack, user, "#484D48")
-- 		return itemstack
-- 	end,
--
-- 	on_secondary_use = function(itemstack, user, pointed_thing)
-- 		mcl_potions.weakness_func(user, -4, mcl_potions.DURATION_2*mcl_potions.INV_FACTOR)
-- 		minetest.do_item_eat(0, "mcl_potions:glass_bottle", itemstack, user, pointed_thing)
-- 		mcl_potions._use_potion(itemstack, user, "#484D48")
-- 		return itemstack
-- 	end
-- })
--
-- minetest.register_craftitem("mcl_potions:strength", {
-- 	description = S("Strength"),
-- 	_tt_help = TODO,
-- 	_doc_items_longdesc = brewhelp,
-- 	wield_image = potion_image("#932423"),
-- 	inventory_image = potion_image("#932423"),
-- 	groups = { brewitem=1, food=3, can_eat_when_full=1 },
-- 	stack_max = 1,
--
-- 	on_place = function(itemstack, user, pointed_thing)
-- 		mcl_potions.weakness_func(user, 3, mcl_potions.DURATION)
-- 		minetest.do_item_eat(0, "mcl_potions:glass_bottle", itemstack, user, pointed_thing)
-- 		mcl_potions._use_potion(itemstack, user, "#932423")
-- 		return itemstack
-- 	end,
--
-- 	on_secondary_use = function(itemstack, user, pointed_thing)
-- 		mcl_potions.weakness_func(user, 3, mcl_potions.DURATION)
-- 		minetest.do_item_eat(0, "mcl_potions:glass_bottle", itemstack, user, pointed_thing)
-- 		mcl_potions._use_potion(itemstack, user, "#932423")
-- 		return itemstack
-- 	end
-- })
--
-- minetest.register_craftitem("mcl_potions:strength_2", {
-- 	description = S("Strength II"),
-- 	_tt_help = TODO,
-- 	_doc_items_longdesc = brewhelp,
-- 	wield_image = potion_image("#932423"),
-- 	inventory_image = potion_image("#932423"),
-- 	groups = { brewitem=1, food=3, can_eat_when_full=1 },
-- 	stack_max = 1,
--
-- 	on_place = function(itemstack, user, pointed_thing)
-- 		mcl_potions.weakness_func(user, 6, mcl_potions.DURATION_2)
-- 		minetest.do_item_eat(0, "mcl_potions:glass_bottle", itemstack, user, pointed_thing)
-- 		mcl_potions._use_potion(itemstack, user, "#932423")
-- 		return itemstack
-- 	end,
--
-- 	on_secondary_use = function(itemstack, user, pointed_thing)
-- 		mcl_potions.weakness_func(user, 6, mcl_potions.DURATION_2)
-- 		minetest.do_item_eat(0, "mcl_potions:glass_bottle", itemstack, user, pointed_thing)
-- 		mcl_potions._use_potion(itemstack, user, "#932423")
-- 		return itemstack
-- 	end
-- })
--
-- minetest.register_craftitem("mcl_potions:strength_plus", {
-- 	description = S("Strength +"),
-- 	_tt_help = TODO,
-- 	_doc_items_longdesc = brewhelp,
-- 	wield_image = potion_image("#932423"),
-- 	inventory_image = potion_image("#932423"),
-- 	groups = { brewitem=1, food=3, can_eat_when_full=1 },
-- 	stack_max = 1,
--
-- 	on_place = function(itemstack, user, pointed_thing)
-- 		mcl_potions.weakness_func(user, 3, mcl_potions.DURATION_PLUS)
-- 		minetest.do_item_eat(0, "mcl_potions:glass_bottle", itemstack, user, pointed_thing)
-- 		mcl_potions._use_potion(itemstack, user, "#932423")
-- 		return itemstack
-- 	end,
--
-- 	on_secondary_use = function(itemstack, user, pointed_thing)
-- 		mcl_potions.weakness_func(user, 3, mcl_potions.DURATION_PLUS)
-- 		minetest.do_item_eat(0, "mcl_potions:glass_bottle", itemstack, user, pointed_thing)
-- 		mcl_potions._use_potion(itemstack, user, "#932423")
-- 		return itemstack
-- 	end
-- })