json test

local Mod = RegisterMod("Challenge Only Trinkets", 1)
local game = Game()

local GameState = {}
local json = require("json")

local Challenges = {
	CHALLENGE_ONLY_TRINKETS = Isaac.GetChallengeIdByName("Trinkets Only!")

function Mod:onStart()
	GameState = json.decode(Mod:LoadData()) -- decodes the data from the savefile (returns a lua table)
	if GameState.HeartKill == nil then GameState.HeartKill = 0 end
end
Mod:AddCallback(ModCallbacks.MC_POST_PLAYER_INIT, Mod.onStart)

function Mod:onHeartKill(entity)
	-- Isaac.ConsoleOutput("Heart?")
	local data = entity:GetData()
	if entity:IsDead() -- is it dead?
	and not data.Died then -- did it already die?
		data.Died = true -- well now it is dead
		if game.Challenge == Challenges.CHALLENGE_ONLY_TRINKETS then
			Isaac.ConsoleOutput("Diiiiie!!")
			-- increase the kill counter
			GameState.HeartKill = GameState.HeartKill + 1

			-- reevaluate the custom achievements
			reevaluateCustomAchievements = true
		end
	end
end
Mod:AddCallback(ModCallbacks.MC_NPC_UPDATE, Mod.onHeartKill, EntityType.ENTITY_MOMS_HEART)

function Mod:onExit(save)
	Mod:SaveData(json.encode(GameState))	-- encodes the data
end
Mod:AddCallback(ModCallbacks.MC_PRE_GAME_EXIT, Mod.onExit)
Mod:AddCallback(ModCallbacks.MC_POST_GAME_END, Mod.onExit)