Checkpoint(s) on block touch

local checkpoints = {ItemType.CLAY_WHITE, ItemType.CLAY, ItemType.WOOL_BLUE}
local checkpointshistory = {}
local lastCheckedPositions = {}

local function sendCheckpointMessage(player, message)
    MessageService.sendInfo(player, message)
    SoundService.playSoundForPlayer(player, SoundType.CAITLYN_CONTRACT_ACCEPT, player:getEntity():getPosition())
end

local function checkForPlayers()
    for _, blockType in pairs(checkpoints) do
        local blocks = BlockService.getAllBlocks({blockType})
        for _, block in pairs(blocks) do
            local blockPosition = block.position + Vector3.new(0, 3, 0)
            local nearbyPlayers = PlayerService.getNearbyPlayers(blockPosition, 5.4)
            if nearbyPlayers and #nearbyPlayers > 0 then
                for _, player in pairs(nearbyPlayers) do
                    local found = false
                    for _, history in pairs(checkpointshistory) do
                        if history.playerId == player.userId then
                            found = true
                            if history.position ~= blockPosition then
                                history.position = blockPosition
                                sendCheckpointMessage(player, "Checkpoint saved")
                                if lastCheckedPositions[player.userId] ~= tostring(blockPosition) then
                                    print("Player " .. player.name .. " is near block at position: " .. tostring(blockPosition))
                                    lastCheckedPositions[player.userId] = tostring(blockPosition)
                                end
                            end
                            break
                        end
                    end
                    if not found then
                        table.insert(checkpointshistory, {playerId = player.userId, position = blockPosition})
                        sendCheckpointMessage(player, "Checkpoint saved")
                        print("Player " .. player.name .. " is near block at position: " .. tostring(blockPosition))
                        lastCheckedPositions[player.userId] = tostring(blockPosition)
                    end
                end
            end
        end
    end
end

Events.EntitySpawn(function(event)
    local entity = event.entity
    local player = entity:getPlayer()

    if player then
        for _, history in pairs(checkpointshistory) do
            if history.playerId == player.userId then
                local blockPosition = history.position
                local newPosition = blockPosition + Vector3.new(0, 5, 0)
                entity:setPosition(newPosition)
                break
            end
        end
        SoundService.playSoundForPlayer(player, SoundType.GOLD_SPIRIT_DAGGER_SLASH, entity:getPosition())
    end
end)

while task.wait(0.1) do
    checkForPlayers()
end