TrailScript

-- Variables

local dataStore = game:GetService("DataStoreService"):GetDataStore("TrailShopTest")

-- Functions

local function EquipTrail(plr,trail)
    local char = plr.Character

    if trail ~= nil and char ~= nil then

        if char.HumanoidRootPart:FindFirstChild("Attachment") then char.HumanoidRootPart.Attachment:Destroy() end
        if char.Head:FindFirstChild("Attachment") then char.Head.Attachment:Destroy() end

        if char:FindFirstChild(plr.Name.."'s Trail") then char[plr.Name.."'s Trail"]:Destroy() end
        trail.Name = plr.Name.."'s Trail"

        local attachment1 = Instance.new("Attachment",char:FindFirstChild("HumanoidRootPart"))
        local attachment2 = Instance.new("Attachment",char:FindFirstChild("Head"))

        trail.Attachment0 = attachment1
        trail.Attachment1 = attachment2

        trail.Parent = char
    end
end

-- Player Joins

game.Players.PlayerAdded:Connect(function(player)

    -- Stats for the player
    local coins = Instance.new("IntValue",player); coins.Name = "Coins"
    local trailInventory = Instance.new("Folder",player); trailInventory.Name = "TrailInventory"
    local equippedTrail = Instance.new("StringValue",player); equippedTrail.Name = "EquippedTrail"

    -- Player's character added to the game

    player.CharacterAdded:Connect(function(char)

        if game.ReplicatedStorage.Trails:FindFirstChild(equippedTrail.Value) then
            EquipTrail(player,game.ReplicatedStorage.Trails:FindFirstChild(equippedTrail.Value):Clone())
        end
    end)

    -- If the equipped Value changed, it will get their trail
    equippedTrail.Changed:Connect(function()
        if equippedTrail.Value ~= nil then
            if game.ReplicatedStorage.Trails:FindFirstChild(equippedTrail.Value) then
                EquipTrail(player,game.ReplicatedStorage.Trails:FindFirstChild(equippedTrail.Value):Clone())
            end
        end
        if equippedTrail.Value == "" then

            local char = player.Character

            local root = char:FindFirstChild("HumanoidRootPart")
            local head = char:FindFirstChild("Head")

            if root:FindFirstChild("Attachment") then root.Attachment:Destroy() end
            if head:FindFirstChild("Attachment") then head.Attachment:Destroy() end

            if char:FindFirstChild(player.Name.."'s Trail") then char[player.Name.."'s Trail"]:Destroy() end
        end
    end)

    -- loaded up the data

    local data

    local success, errorMsg = pcall(function()
        data = dataStore:GetAsync(player.UserId)
    end)

    if data ~= nil then
        if data.Coins then
            coins.Value = data.Coins
        end
        if data.EquippedTrail then
            equippedTrail.Value = data.EquippedTrail
        end
        if data.Trails then
            for index,trail in pairs(data.Trails) do
                local bool = Instance.new("BoolValue",trailInventory); bool.Name = trail
            end
        end
    else
        -- New player
        print("A new challenger approch")
    end

    -- This event will fire the client to update the gui
    game.ReplicatedStorage.Events.SendData:FireClient(player,data)
end)

game.Players.PlayerRemoving:Connect(function(player)
    -- Data holder
    local data = {}

    data.Coins = player.Coins.Value

    data.EquippedTrail = player.EquippedTrail.Value

    data.Trails = {}

    for i,v in pairs(player.TrailInventory:GetChildren()) do
        table.insert(data.Trails,v.Name)
    end

    local success, errorMsg = pcall(function()
        dataStore:SetAsync(player.UserId,data)
    end)

    -- if its succeed then the data is saved else we got an error

    if success then
        print("Succesfully saved")
    else
        print(errorMsg)
    end

end)

game:BindToClose(function()
    for index, player in pairs(game.Players:GetPlayers()) do
        local data = {}

        data.Coins = player.Coins.Value

        data.EquippedTrail = player.EquippedTrail.Value

        data.Trails = {}

        for i,v in pairs(player.TrailInventory:GetChildren()) do
            table.insert(data.Trails,v.Name)
        end

        local success, errorMsg = pcall(function()
            dataStore:SetAsync(player.UserId,data)
        end)

        -- if its succeed then the data is saved else we got an error

        if success then
            print("Succesfully saved")
        else
            print(errorMsg)
        end
    end
end)

-- Server Events

game.ReplicatedStorage.Events.BuyItem.OnServerInvoke = function(player, trailName)

    local trail = game.ReplicatedStorage.Trails:FindFirstChild(trailName)
    local ifsInInventory

    if player.TrailInventory:FindFirstChild(trailName) then
        ifsInInventory = true
    end

    if trail then
        if trail:FindFirstChild("Price") then
            if not ifsInInventory then
                -- Check if we can buy the trail
                if player.Coins.Value >= trail.Price.Value then
                    print(player.Name.." brought the ".. trail.Name.." trail")

                    player.Coins.Value = player.Coins.Value - trail.Price.Value

                    local bool = Instance.new("BoolValue",player.TrailInventory); bool.Name = trail.Name

                    return "Brought"
                else
                    return "NotEnough"
                end
            else
                -- You already owned it
                if player.EquippedTrail.Value ~= trail.Name then
                    player.EquippedTrail.Value = trail.Name
                    print(player.Name.." equipped the ".. trail.Name.." trail")
                    return "Equip"
                else
                    player.EquippedTrail.Value = ""
                    print(player.Name.." unequipped the ".. trail.Name.." trail")
                    return "Unequip"
                end
            end
        end
    end

end