multiple costumes support

local Mod = RegisterMod("yourMod", 1)
local game = Game()

TrinketType.TRINKET_YOUR_TRINKET = Isaac.GetTrinketIdByName("Your Trinket")		-- trinket
Mod.COSTUME_ONE = Isaac.GetCostumeIdByPath("gfx/characters/YourCostume.anm2")
Mod.COSTUME_TWO = Isaac.GetCostumeIdByPath("gfx/characters/YourCostumeTwo.anm2")
Mod.COSTUME_THREE = Isaac.GetCostumeIdByPath("gfx/characters/YourCostumeThree.anm2")
Mod.COSTUME_FOUR = Isaac.GetCostumeIdByPath("gfx/characters/YourCostumeFour.anm2")
Mod.COSTUME_FIVE = Isaac.GetCostumeIdByPath("gfx/characters/yourCostumeFive.anm2")

-- on post peffect update
function Mod:onModUpdate(player)

	if game:GetFrameCount() == 1
	and ctc then
		ctc:RegisterTrinketCostume(TrinketType.TRINKET_YOUR_TRINKET, Mod.COSTUME_ONE, "true")
		ctc:AddMoreCostumes(TrinketType.TRINKET_YOUR_TRINKET, Mod.COSTUME_TWO, Mod.COSTUME_THREE, Mod.COSTUME_FOUR, Mod.COSTUME_FIVE)
		-- ctc:AddMoreCostumes(TrinketType.TRINKET_YOUR_TRINKET, Mod.COSTUME_TWO, Mod.COSTUME_THREE, _, _)
	end
	end
end
Mod:AddCallback(ModCallbacks.MC_POST_PEFFECT_UPDATE, Mod.onModUpdate)



-- for the sake of this example mod, let's say we make a trinket, which changes the player's appearance depending on the amount of time the player got hit
-- Max is 4 times per floor. At the start of a new floor the 'hit'-counter ans the player's appearance gets reset.
-- every condition has one costume asssigned to it
-- Our list of conditiond looks like this
-- Condition 1 = No damage taken	| costume 1
-- Condition 2 = 1 damage taken		| costume 2
-- Condition 3 = 2 damage taken		| costume 3
-- Condition 4 = 3 damage taken		| costume 4
-- Condition 5 = 4 damage taken		| costume 5


function Mod:conditionExample(entity, amt, flag, source, countdown)
	if ctc then	-- check if the Trinket Costume mod is active
		for i = 0, (game:GetNumPlayers() - 1) do
			local player = Isaac.GetPlayer(i)
			local playerData = player:GetData()

			if player:HasTrinket(TrinketType.TRINKET_YOUR_TRINKET) then

				if playerData.GotHit == nil then	-- init playerData
				playerData.GotHit = 0
				-- during the first init of the mod the first condition is automatically set to 'true'
				-- no condition change during the init needed
				end

				if playerData.GotHit == 0 then		-- player never got hit before
					playerData.GotHit = 1		-- now he got hit once
					-- change the condition
					-- required function ctc:UpdateConditions(player, trinketId, conditionNum)
					-- will set the other conditions to 'false' and remove the current costume
					-- trinketId = TrinketType.TRINKET_YOUR_TRINKET
					-- conditionNum is the number of the your condition which is now fullfilled

					ctc:UpdateConditions(player, TrinketType.TRINKET_YOUR_TRINKET, 2)

				elseif playerData.GotHit == 1 then	-- player got hit once before
					playerData.GotHit = 2		-
					ctc:UpdateConditions(player, TrinketType.TRINKET_YOUR_TRINKET, 3)

				elseif playerData.GotHit == 2 then	-- player got hit once before
					playerData.GotHit = 3
					ctc:UpdateConditions(player, TrinketType.TRINKET_YOUR_TRIKET, 4)

				elseif playerData.GotHit == 3 then	-- player got hit once before
					playerData.GotHit = 4
					ctc:UpdateConditions(player, TrinketType.TRINKET_YOUR_TRINKET, 5)
				end
			end
		end
	end
end
Mod:AddCallback(ModCallbacks.MC_ENTITY_TAKE_DMG, Mod.conditionExample, EntityType.ENTITY_PLAYER)

-- So now to the part where we check if the player entered a new level/floor
function Mod:conditionExamplePartTwo(_)
	if ctc then	-- check if the Trinket Costume mod is active
		-- now we need to check for the player, since he isn't given by the Callback itself
		for i = 0, (game:GetNumPlayers() - 1) do
			local player = Isaac.GetPlayer(i)
			local playerData = player:GetData()

			-- check if the player has your trinket
			if player:HasTrinket(TrinketType.TRINKET_YOUR_TRINKET) then

				if playerData.GotHit > 0 then	-- the player got hit on the previous floor, so has another costume
					playerData.GotHit = 0	-- reset the 'hit'- counter
					-- change the condition

					ctc:UpdateConditions(player, TrinketType.TRINKET_YOUR_TRINKET, 1)	-- never gotten hit was the first conditions
				end
			end
		end
	end
end
Mod:AddCallback(ModCallbacks.MC_POST_NEW_LEVEL, Mod.conditionExamplePartTwo)