local BombBugs = RegisterMod("BombBugs", 1)
local game = Game()

-- reference item and bomb

local bombBugs = Isaac.GetItemIdByName("Bomb Bugs")
local bombs = {}   -- empty array of bombs


-- getting a bug on a bomb explosion

function BombBugs:onExplosion()

	-- reference player

	local player = Isaac.GetPlayer(0)
        local entities = Isaac.GetRoomEntities()


	-- detect a bomb explosion

	if player:HasCollectible(bombBugs) then
		for j = 1, #entities do    -- we check all entities in the room
			if(entities[j].Type == EntityType.ENTITY_BOMBDROP) then  -- should be a bomb
			      if(entities[j]:GetData().Exploded == nil) then -- a fresh bomb
                                    entities[j]:GetData().Exploded = false -- property that the bomb hasn't exploded yet
                                    table.insert(bombs, entities[j]) --insert the found bomb into the aray
                              end
			end
		end
                for j = 1, #bombs do   -- iterate through every bomb
                      if(bombs[j]:IsDead() and bombs[j]:GetData().Exploded == false) then -- if bomb is dead (has exloded)
                             bombs[j]:GetData().Exploded = true    -- property that the bomb is exploded
                             local rng = player:GetCollectibleRNG(bombBugs)
                             local roll = rng:RandomInt(100)
                             if roll < 85 then
                                      Isaac.Spawn(EntityType.ENTITY_FAMILIAR, FamiliarVariant.BLUE_SPIDER, 0, bombs[j].Position, Vector(0,0), player)  -- add blue spider if a bomb explodes
                             elseif roll < 95 then
                                      if player:GetTrinket(0) ~= TrinketType.TRINKET_TICK
                                      and player:GetTrinket(1) ~= TrinketType.TRINKET_TICK then -- the game tries to give the player a tick
                                              Isaac.Spawn(EntityType.ENTITY_PICKUP, PickupVariant.PICKUP_TRINKET, TrinketType.TRINKET_TICK, player.Position, Vector(0,0), player)
                                              -- player:ToPlayer():AddTrinket(TrinketType.TRINKET_TICK)
                                      else
                                              Isaac.Spawn(EntityType.ENTITY_FAMILIAR, FamiliarVariant.BLUE_SPIDER, 0, bombs[j].Position, Vector(0,0), player)
                                      end
                             else
                                      Isaac.Spawn(EntityType.ENTITY_SPIDER, 2, 1, bombs[j].Position, Vector(0,0), player) -- spawn a red spider at a 5% chance
                             end
                      end
                end
                for j = 1, #entities do
                        if(entities[j].Type == EntityType.ENTITY_BOMBDROP) then
                               if(entities[j]:GetData().Exploded == true) then   -- the bomb, which is exploded
                                       entities[j]:Remove() --remove the original bomb?
                               end
                        end

                end
	end
end

BombBugs:AddCallback(ModCallbacks.MC_POST_UPDATE, BombBugs.onExplosion)