won

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

local reevaluateCustomAchievements = false

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
    if GameState.SatanKill == nil then GameState.SatanKill = 0 end
    if GameState.Trophy == nil then GameState.Trophy = 0 end
end
Mod:AddCallback(ModCallacks.MC_POST_PLAYER_INIT, Mod.onStart)

function Mod:onExit(save)
   Mod:SaveData(json.encode(GameState))
end
Mod:AddCallback(ModCallacks.MC_PRE_GAME_EXIT, Mod.onExit)
Mod:AddCallback(ModCallacks.MC_POST_GAME_END, Mod.onExit)

if Challenge == -- the challenge
or Challenge == -- the other challenge then
    if reevaluateCustomAchievements == true then
        -- check for current gamestates
        -- first the achievements gained through Mom's Heart
        if GameState.HeartKill == 1 then
            -- spawn the achievement paper
            Isaac.Spawn(EntityType.ENTITY_EFFECT, EffectVariant.FIRST_TRINKET_CHALLENGE_WON, 0, Vector(0,0), Vector(250, 200), player)
            -- increase the trophy counter
            GameState.Thropy = GameState.Thropy + 1
            -- check if the trophy should be spawned
            if GameState.Thropy == 2 then -- the 2 challenges have been beaten
                -- spawn the achievement paper
                Isaac.Spawn(EntityType.ENTITY_EFFECT, EffectVariant.TROPHY_ACHIEVEMENT, 0, Vector(0,0), Vector(250, 200), player)
            end
        elseif GameState.HeartKill == 5 then
            -- spawn the achievement paper
            Isaac.Spawn(EntityType.ENTITY_EFFECT, EffectVariant.TRUE_TESTING_DEDICATION, 0, Vector(0,0), Vector(250, 200), player)
        end
        -- achievement gained through Satan
        if GameState.SatanKill == 1 then
            -- spawn the achievement paper
            Isaac.Spawn(EntityType.ENTITY_EFFECT, EffectVariant.SECOND_TRINKET_CHALLENGE_WON, 0, Vector(0,0), Vector(250, 200), player)
            -- increase the trophy counter
            GameState.Thropy = GameState.Thropy + 1
            -- check if the trophy should be spawned
            if GameState.Thropy == 2 then -- the 2 challenges have been beaten
                -- spawn the achievement paper
                Isaac.Spawn(EntityType.ENTITY_EFFECT, EffectVariant.TROPHY_ACHIEVEMENT, 0, Vector(0,0), Vector(250, 200), player)
            end
        end
        reevaluateCustomAchievements = false
    end
end
Mod:AddCallback(ModCallacks.MC_POST_PEFFECT_UPDATE, Mod.onUpdate)

function Mod:onHeartKill(entity)
    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 Challenge == -- the Challenge then
            -- increase the kill counter
            GameState.HeartKill = GameState.HeartKill + 1

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

function Mod:onSatanKill(entity)
    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 Challenge == -- the Challenge then
            -- increase the kill counter
            GameState.SatanKill = GameState.SatanKill + 1

            -- reevaluate the custom achievements
            reevaluateCustomAchievements = true
        end
    end
end
Mod:AddCallback(ModCallacks.MC_NPC_UPDATE, Mod.onSatanKill, EntityType.ENTITY_SATAN)