Leaderboard Script(Roblox)

print("Keaderboard script loaded!")

maxlevel = 50

function onXPChanged(player, score, level)
        if score.Value>= 25 * (level.Value) + 100 and level.Value < maxlevel then
            score.Value = score.Value - (25*(level.Value) + 100)
            level.Value = level.Value + 1
        end
    end

function onLevelUp(player, score, level)
if player.Character~=nil then
for i = 1,5 do
local fireworks = Instance.new("Part")
fireworks.Shape = 0
fireworks.formFactor = "Symmetric"
fireworks.Size = Vector3.new(1,1,1)
fireworks.BrickColor = BrickColor.Random()
fireworks.CFrame = player.Character.Head.CFrame + Vector3.new(0,2,0)
fireworks.Parent = game.Workspace
game:GetService("Debris"):AddItem(fireworks, 2)
fireworks.Velocity = Vector3.new(math.random(-30,30),math.random(-30,30),math.random(-30,30))
end
end
local m = Instance.new("Hint")
m.Parent = game.Workspace
m.Text = player.Name .. " has ranked up!" --Sweet!
wait(5)
m.Parent = nil
end



function onHumanoidDied(humanoid, player)
    local stats = player:findFirstChild("leaderstats")
    if stats ~= nil then
        local deaths = stats:findFirstChild("Dies")
        deaths.Value = deaths.Value + 1


        -- do short dance to try and find the killer

        local killer = getKillerOfHumanoidIfStillInGame(humanoid)

        handleKillCount(humanoid, player)
    end
end

function onPlayerRespawn(property, player)
    -- need to connect to new humanoid

    if property == "Character" and player.Character ~= nil then
        local humanoid = player.Character.Humanoid
            local p = player
            local h = humanoid
            humanoid.Died:connect(function() onHumanoidDied(h, p) end )
    end
end

function getKillerOfHumanoidIfStillInGame(humanoid)
    -- returns the player object that killed this humanoid
    -- returns nil if the killer is no longer in the game

    -- check for kill tag on humanoid - may be more than one - todo: deal with this
    local tag = humanoid:findFirstChild("creator")

    -- find player with name on tag
    if tag ~= nil then

        local killer = tag.Value
        if killer.Parent ~= nil then -- killer still in game
            return killer
        end
    end

    return nil
end

function handleKillCount(humanoid, player)
    local killer = getKillerOfHumanoidIfStillInGame(humanoid)
    if killer ~= nil then
        local stats = killer:findFirstChild("leaderstats")
        if stats ~= nil then
            local kills = stats:findFirstChild("Kills")
            local score = stats:findFirstChild("XP")
            local level = stats:findFirstChild("Rank")
            if killer ~= player then
                score.Value = score.Value + 250 *
                kills.Value = kills.Value + 1

            else
                kills.Value = kills.Value - 1
            end
        end
    end
end


-----------------------------------------------
function plr(newPlayer)
        local stats = Instance.new("IntValue")
        stats.Name = "leaderstats"

        local kills = Instance.new("IntValue")
        kills.Name = "Kills"
        kills.Value = 0

        local deaths = Instance.new("IntValue")
        deaths.Name = "Dies"
        deaths.Value = 0

        local score = Instance.new("IntValue")
        score.Name = "XP"
        score.Value = 0

        local rank = Instance.new("IntValue")
        rank.Name = "Rank"
        rank.Value = 1

        local fill = Instance.new("IntValue")
        fill.Name= "filler1"
        fill.Value = 0

        rank.Parent = stats
        score.Parent = stats
        kills.Parent = stats
        deaths.Parent = stats
        fill.Parent = stats
        stats.Parent = newPlayer

    --[[    if newPlayer.usedId == 65006475 then
        newPlayer.leaderstats.Rank.Value = maxlevel
        end]]

    score.Changed:connect(function() onXPChanged(newPlayer, score, rank) end)
    rank.Changed:connect(function() onLevelUp(newPlayer, score, rank) end)

        while true do
            if newPlayer.Character ~= nil then break end
            wait(5)
        end

        local humanoid = newPlayer.Character.Humanoid

        humanoid.Died:connect(function() onHumanoidDied(humanoid, newPlayer) end )

        -- start to listen for new humanoid
        newPlayer.Changed:connect(function(property) onPlayerRespawn(property, newPlayer) end )
        end


        for _,v in pairs(game.Players:GetPlayers()) do
    plr(v)
end

game.Players.ChildAdded:connect(plr)