main.lua

local ArunesMod = RegisterMod("Arunes", 1)
local game = Game()

--Stats--
local ArunesStats = {
  Arunes1 = 10
}

local Dir = {
	[Direction.UP] = Vector(0,-1),
	[Direction.DOWN] = Vector(0,1),
	[Direction.LEFT] = Vector(-1,0),
	[Direction.RIGHT] = Vector(1,0)
}

local Arunes_item = Isaac.GetItemIdByName("Arunes")
local Costume_Anim = Isaac.GetCostumeIdByPath("gfx/characters/arunesanim.anm2")
EffectVariant.ARUNES_COSTUME = Isaac.GetEntityVariantByName("Arunes Body")

function ArunesMod:onUpdate(player)
    local MoveDir = player:GetMovementDirection()
    for _, entities in pairs(Isaac.GetRoomEntities()) do
        if entities.Type == EntityType.ENTITY_EFFECT
        and entities.Variant == EffectVariant.ARUNES_COSTUME then
            local costumeEffect = entities
            local sprite = costumeEffect:GetSprite()
            -- set the offset
            effect.Velocity = player.Position - effect.Position

            -- check the fire direction to set the offset
			if MoveDir == Direction.DOWN then
				if not (sprite:IsPlaying(“WalkDown“) then
                    sprite:Play(“WalkDown“, true)
                end
			elseif MoveDir == Direction.RIGHT then
				if not (sprite:IsPlaying(“WalkRight“) then
                    sprite:Play(“WalkRight“, true)
                end
			elseif MoveDir == Direction.UP then
				if not (sprite:IsPlaying(“WalkUp“) then
                    sprite:Play(“WalkUp“, true)
                end
			elseif MoveDir == Direction.LEFT then
				if not (sprite:IsPlaying(“WalkLeft“) then
                    sprite:Play(“WalkLeft“, true)
                end
            else
                sprite:Play(“WalkDown“, true)
			end
        end
    end
end
ArunesMod:AddCallback( ModCallbacks.MC_POST_PLAYER_UPDATE, ArunesMod.onUpdate)

--When effect updates + costume for item--
--Cache Updates for stats--
function ArunesMod:cacheUpdate(player, cacheFlag)
    player = Isaac.GetPlayer(0)

    --costume finally
    if player:HasCollectible(Arunes_item) then
       if HasArunes ~= true then
           player:AddNullCostume(Costume_Anim)
           Isaac.Spawn(EntityType.ENTITY_EFFECT, EffectVariant.ARUNES_COSTUME, 0, player.Position, Vector(0,0), player):ToEffect()
           HasArunes = true
       end
    elseif HasArunes == true and player:HasCollectible(Arunes_item) == false then
        player:TryRemoveNullCostume(Costume_Anim)
        HasArunes = false
    end
    --
    --stats update
    if cacheFlag == CacheFlag.CACHE_LUCK then
        if player:HasCollectible(Arunes_item) then
            player.Luck = player.Luck + ArunesStats.Arunes1
        end
    end
    if cacheFlag == CacheFlag.CACHE_FLYING then
        if player:HasCollectible(Arunes_item) then
            player.CanFly = true
        end
    end
end
ArunesMod:AddCallback( ModCallbacks.MC_EVALUATE_CACHE, ArunesMod.cacheUpdate)

function ArunesMod:onCostume(effect)
    local sprite = effect:GetSprite()
    local player = Isaac.GetPlayer(0)
    local MoveDir = player:GetMovementDirection()

    effect.RenderZOffset = 4900    -- 1300 is enough for most obstacles, but not for the player
    effect.Velocity = player.Position - effect.Position

    if effect:GetData().Init == nil then
        -- Isaac.ConsoleOutput("Appear ")
        -- play the correct animation
        if MoveDir == Direction.DOWN then
            sprite:Play(“WalkDown“, true)
		elseif MoveDir == Direction.RIGHT then
            sprite:Play(“WalkRight“, true)

		elseif MoveDir == Direction.UP then
            sprite:Play(“WalkUp“, true)

		elseif MoveDir == Direction.LEFT then
            sprite:Play(“WalkLeft“, true)
        else
            sprite:Play(“WalkDown“, true)
		end
        effect:GetData().Init = true
    end
end
ArunesMod:AddCallback(ModCallbacks.MC_POST_EFFECT_INIT, ArunesMod.onCostume, EffectVariant.ARUNES_COSTUME)


function ArunesMod.onNewRoom(_)
    local player = Isaac.GetPlayer(0)
    local roomType = game:GetRoom():GetType()

    -- give the costume to the player
    if player:HasCollectible(Arunes_item) then

        Isaac.Spawn(EntityType.ENTITY_EFFECT, EffectVariant.ARUNES_COSTUME, 0, player.Position, Vector(0,0), player):ToEffect()
    end

end
ArunesMod:AddCallback(ModCallbacks.MC_POST_NEW_ROOM, ArunesMod.onNewRoom)