Ranking System

-- Ranking System

local Players = game:GetService("Players")
local SS = game:GetService("ServerStorage")
local Lighting = game:GetService("Lighting")

local rankReqs = script:WaitForChild("Ranks")
local StatsFolder = SS:WaitForChild(".stats")

local NumToRank = {
    [0] = 'F-',
    [1] = 'F',
    [2] = 'F+',
    [3] = 'E-',
    [4] = 'E',
    [5] = 'E+',
    [6] = 'D-',
    [7] = 'D',
    [8] = 'D+',
    [9] = 'C-',
    [10] = 'C',
    [11] = 'C+',
    [12] = 'B-',
    [13] = 'B',
    [14] = 'B+',
    [15] = 'A-',
    [16] = 'A',
    [17] = 'A+',
    [18] = 'S-',
    [19] = 'S',
    [20] = 'S+',
    [21] = 'SS-',
    [22] = 'SS',
    [23] = 'SS+',
    [24] = 'SS++',
};


Players.PlayerAdded:Connect(function(plr)
    local plrFolder = StatsFolder:WaitForChild(plr.Name, 20)

    warn("Ranking System V.2 has loaded for ".. plr.Name.. ' | Scripted by: SenkoArdeth')

    local combatEXP = plrFolder:WaitForChild('CombatEXP')
    local missionEXP = plrFolder:WaitForChild('MissionEXP')
    local trainingEXP = plrFolder:WaitForChild('TrainingEXP')

    local currentRank = plrFolder:WaitForChild('Rank')
    local canRank = plrFolder:WaitForChild('CanRank')
    local skillPoints = plrFolder:WaitForChild('SkillPoints')

    local previousRankUp = plrFolder:WaitForChild('PreviousRankUp')

    local function checkRank()
        -- No rank CD until E+ | E+ = 6

        if currentRank.Value <= 6 then -- below E+ or E+
            -- below E+ or E+
            canRank.Value = true

            local requirements = tostring(currentRank.Value)
            requirements = rankReqs:FindFirstChild(requirements)

            if requirements then
                local totalReq = requirements.Combat.Value + requirements.Mission.Value + requirements.Training.Value
                local currentTotal = combatEXP.Value + missionEXP.Value + trainingEXP.Value

                if currentTotal >= totalReq then
                    currentRank.Value = currentRank.Value + 1
                    warn(plr.Name.. " can rank up to ".. NumToRank[currentRank.Value])

                    combatEXP.Value = 0
                    missionEXP.Value = 0
                    trainingEXP.Value = 0

                    skillPoints.Value = skillPoints.Value + 1

                else
                    warn(plr.Name.. " can not rank up to ".. NumToRank[currentRank.Value])
                end
            else
                print'could not find'
            end

            return;
        end

        if currentRank.Value > 6 then -- above E

            warn(tick() - previousRankUp.Value)

            if tick() - previousRankUp.Value >= 600 then
                canRank.Value = true
            end

            if canRank.Value == false then

                print(plr.Name.. " can't rank up because his/her's CanRank value is false.")
                return;
            end

            local requirements = tostring(currentRank.Value)
            requirements = rankReqs:FindFirstChild(requirements)

            if requirements then
                local totalReq = requirements.Combat.Value + requirements.Mission.Value + requirements.Training.Value
                local currentTotal = combatEXP.Value + missionEXP.Value + trainingEXP.Value

                if currentTotal >= totalReq then
                    currentRank.Value = currentRank.Value + 1
                    warn(plr.Name.. " can rank up to ".. NumToRank[currentRank.Value])

                    combatEXP.Value = 0
                    missionEXP.Value = 0
                    trainingEXP.Value = 0

                    canRank.Value = false

                    previousRankUp.Value = tick()

                    skillPoints.Value = skillPoints.Value + 1

                else
                    warn(plr.Name.. " can not rank up to ".. NumToRank[currentRank.Value])
                end
            end

            return;
        end
    end

    combatEXP.Changed:Connect(function()
        print'combat exp changed'
        checkRank()
    end)

    missionEXP.Changed:Connect(function()
        print'mission exp changed'
        checkRank()
    end)

    trainingEXP.Changed:Connect(function()
        print'trianign exp changed'
        checkRank()
    end)
end)