local modname = "DeadGod Helper"
local mod = RegisterMod(modname, 1)
local json = require("json")
local math = require("math")
mod.print = Isaac.ConsoleOutput
mod.game = Game()
local save = include("save"):new()
if mod:HasData() then
	save = json.decode(mod:LoadData())
end

mod.font = Font()
mod.font:Load("font/terminus.fnt")

function mod:isCurseBlind()
	return mod.game:GetLevel():GetCurses() & LevelCurse.CURSE_OF_BLIND > 0
end

function mod.isIdNotTakenAlready(id)
	if id>=1 and id<=save.settings.maxid then
		return not save.seen[id]
	else
		return false
	end
end

function mod.registerTouched(id)
	if id>=1 and id<=save.settings.maxid then
		save.seen[id] = true
	end

	-- Save
	mod:SaveData(json.encode(save))
end

-- Used to check if EID's description should be modified
function mod.shouldBeModified(descObj)
	-- Taken from https://github.com/wofsauge/External-Item-Descriptions/wiki/Description-Modifiers
	-- if entity is a piedestal
	if descObj.ObjType == 5 and descObj.ObjVariant == 100 then
		-- Check if item was not already taken in this savefile
		-- And if item is non-modded (id<= Mom's ring ID)
		local id = descObj.ObjSubType
		return mod.isIdNotTakenAlready(id)
	end
end

-- Used to modify EID's description
function mod.modifierCallback(descObj)
	if save.settings.eid then
		descObj.Description = "#{{Trophy}} Not picked up yet!#"..descObj.Description
	end
	return descObj
end

-- Used to detect when an item is picked up
function mod:update()
	for i=0, mod.game:GetNumPlayers()-1 do
		local player = mod.game:GetPlayer(i)
		local data = player:GetData()
		local item = player.QueuedItem.Item
		if data._deadgodlastid and data._deadgodlastcount and data._deadgodlastid>0 then
			if item==nil then -- Finished animation
				if player:GetCollectibleNum(data._deadgodlastid)>data._deadgodlastcount then -- Have it on me
					-- Then I just picked it up, yay
					mod.registerTouched(data._deadgodlastid)
					data._deadgodlastid = 0
					data._deadgodlastcount = 0
				end
			end
		end
		if item and item:IsCollectible() then
			data._deadgodlastid = item.ID
			data._deadgodlastcount = player:GetCollectibleNum(item.ID)
		end
	end
end

-- Used to draw the ! sign
function mod:PickupDrawCallback(pickupEntity, _)
	if save.settings.visual and (not mod:isCurseBlind() or save.settings.showonblind)then
		if pickupEntity.Variant==PickupVariant.PICKUP_COLLECTIBLE then
			if mod.isIdNotTakenAlready(pickupEntity.SubType) then
				local v = Isaac.WorldToScreen(pickupEntity.Position + pickupEntity.SpriteOffset)
				mod.font:DrawString("!", v.X-1, v.Y-52+math.sin(mod.game:GetFrameCount()/10)*2, KColor(0.98,0.93,0.55,1), 2, true)
			end
		end
	end
end

mod:AddCallback(ModCallbacks.MC_POST_UPDATE, mod.update)
mod:AddCallback(ModCallbacks.MC_POST_PICKUP_RENDER, mod.PickupDrawCallback)

if EID then
	EID:addDescriptionModifier(
		modname,
		mod.shouldBeModified,
		mod.modifierCallback
	)
end

if ModConfigMenu then
	ModConfigMenu.AddSetting(
		modname, -- This should be unique for your mod
		nil,
		{
			Type = ModConfigMenu.OptionType.BOOLEAN,
			CurrentSetting = function()
				return save.settings.eid
			end,
			Display = function()
				return "Show in EID: " .. (save.settings.eid and "on" or "off")
			end,
			OnChange = function(b)
				save.settings.eid = b
			end,
		}
	)
	ModConfigMenu.AddSetting(
		modname, -- This should be unique for your mod
		nil,
		{
			Type = ModConfigMenu.OptionType.BOOLEAN,
			CurrentSetting = function()
				return save.settings.visual
			end,
			Display = function()
				return "Show on pedestals: " .. (save.settings.visual and "on" or "off")
			end,
			OnChange = function(b)
				save.settings.visual = b
			end,
		}
	)

	ModConfigMenu.AddSetting(
		modname, -- This should be unique for your mod
		nil,
		{
			Type = ModConfigMenu.OptionType.BOOLEAN,
			CurrentSetting = function()
				return save.settings.showonblind
			end,
			Display = function()
				return "Show while having Curse Of The Blind: " .. (save.settings.showonblind and "on" or "off")
			end,
			OnChange = function(b)
				save.settings.showonblind = b
			end,
		}
	)
end