-- Default command prefix
local COMMAND_PREFIX = "."

-- Table to store command handlers and usage instructions
local KryptonManager = {}

-- Function to handle player chats for old chat system
local function onPlayerChatted(player, message)
    -- Check if the message starts with the current command prefix
    if string.sub(message, 1, #COMMAND_PREFIX) == COMMAND_PREFIX then
        -- Split the message into command and arguments
        local parts = {}
        for part in message:gmatch("%S+") do
            table.insert(parts, part)
        end

        -- Check if there is at least one argument after the prefix
        if #parts > 0 then
            local command = parts[1]:sub(2):lower() -- Get the command (ignoring case and prefix)
            local args = table.concat(parts, " ", 2) -- Concatenate arguments

            -- Check if the command exists in the KryptonManager table
            if KryptonManager[command] then
                -- Call the command handler function
                KryptonManager[command].handler(player, args)
            else
                -- Print usage instructions to the output console
                print("[Usage] " .. player.Name .. ": ." .. command .. " " .. KryptonManager[command].usage)
            end
        end
    end
end

-- Function to handle player chats for new chat system (Roblox >= 487)
local function onPlayerChattedNew(player, message, recipient)
    -- Check if the message starts with the current command prefix
    if string.sub(message, 1, #COMMAND_PREFIX) == COMMAND_PREFIX then
        -- Split the message into command and arguments
        local parts = {}
        for part in message:gmatch("%S+") do
            table.insert(parts, part)
        end

        -- Check if there is at least one argument after the prefix
        if #parts > 0 then
            local command = parts[1]:sub(2):lower() -- Get the command (ignoring case and prefix)
            local args = table.concat(parts, " ", 2) -- Concatenate arguments

            -- Check if the command exists in the KryptonManager table
            if KryptonManager[command] then
                -- Call the command handler function
                KryptonManager[command].handler(player, args)
            else
                -- Print usage instructions to the output console
                player:SendSystemMessage("[Usage] ." .. command .. " " .. KryptonManager[command].usage, Enum.ChatColor.Blue)
            end
        end
    end
end

-- Function to find a player by username or display name
local function findPlayerByName(name)
    local players = game.Players:GetPlayers()
    for _, player in ipairs(players) do
        if player.Name:lower() == name:lower() or player.DisplayName:lower() == name:lower() then
            return player
        end
    end
    return nil
end

-- Function to register a new command handler
function KryptonManager:RegisterCommand(command, handler, usage)
    self[command] = {
        handler = handler,
        usage = usage,
    }
end

-- Command handler for changing the command prefix
KryptonManager:RegisterCommand("changeprefix", function(player, args)
    if args and #args == 1 then
        local newPrefix = args
        COMMAND_PREFIX = newPrefix
        print("[Prefix Change] Command prefix changed to '" .. COMMAND_PREFIX .. "' by " .. player.Name)
    else
        print("[Usage] " .. player.Name .. ": .changeprefix <new_prefix>")
    end
end, "<new_prefix>")

-- Command handler for help command
KryptonManager:RegisterCommand("help", function(player, args)
    local helpMessage = "[Help] Available commands:\n"
    for command, info in pairs(KryptonManager) do
        if type(info) == "table" and info.usage then
            helpMessage = helpMessage .. "- ." .. command .. " " .. info.usage .. "\n"
        end
    end
    print(helpMessage)
    player:SendSystemMessage(helpMessage, Enum.ChatColor.Blue)
end, "")

-- Command handler for printing a message
KryptonManager:RegisterCommand("print", function(player, args)
    -- Print the message to the output console
    print("[Chat Print] " .. player.Name .. ": " .. args)
end, "<message>")

-- Command handler for logging an error message
KryptonManager:RegisterCommand("error", function(player, args)
    -- Print an error message to the output console
    warn("[Error] " .. player.Name .. ": " .. args)
end, "<message>")

-- Command handler for logging a warning message
KryptonManager:RegisterCommand("warn", function(player, args)
    -- Print a warning message to the output console
    warn("[Warning] " .. player.Name .. ": " .. args)
end, "<message>")

-- Command handler for retrieving and printing coordinates
KryptonManager:RegisterCommand("coords", function(player, args)
    if args == "me" then
        local position = player.Character and player.Character.PrimaryPart and player.Character.PrimaryPart.Position or Vector3.new()
        print("[Coords] " .. player.Name .. "'s coordinates: (" .. position.X .. ", " .. position.Y .. ", " .. position.Z .. ")")
    elseif args == "others" then
        local players = game.Players:GetPlayers()
        for _, otherPlayer in ipairs(players) do
            local position = otherPlayer.Character and otherPlayer.Character.PrimaryPart and otherPlayer.Character.PrimaryPart.Position or Vector3.new()
            print("[Coords] " .. otherPlayer.Name .. "'s coordinates: (" .. position.X .. ", " .. position.Y .. ", " .. position.Z .. ")")
        end
    else
        local targetPlayer = findPlayerByName(args)
        if targetPlayer then
            local position = targetPlayer.Character and targetPlayer.Character.PrimaryPart and targetPlayer.Character.PrimaryPart.Position or Vector3.new()
            print("[Coords] " .. targetPlayer.Name .. "'s coordinates: (" .. position.X .. ", " .. position.Y .. ", " .. position.Z .. ")")
        else
            print("[Usage] " .. player.Name .. ": .coords <player name / display name or me or others>")
        end
    end
end, "<player name / display name or me or others>")

-- Command handler for teleporting to a player or coordinates
KryptonManager:RegisterCommand("goto", function(player, args)
    local targetPlayer = findPlayerByName(args)
    if targetPlayer then
        -- Teleport player to target player's position
        local targetPosition = targetPlayer.Character and targetPlayer.Character.PrimaryPart and targetPlayer.Character.PrimaryPart.Position
        if targetPosition then
            player.Character:SetPrimaryPartCFrame(CFrame.new(targetPosition))
            print("[Teleport] " .. player.Name .. " teleported to " .. targetPlayer.Name)
        else
            print("[Teleport] " .. targetPlayer.Name .. " does not have a valid position.")
        end
    elseif args == "me" then
        -- Teleport player to their own position
        local position = player.Character and player.Character.PrimaryPart and player.Character.PrimaryPart.Position
        if position then
            player.Character:SetPrimaryPartCFrame(CFrame.new(position))
            print("[Teleport] " .. player.Name .. " teleported to their own position.")
        else
            print("[Teleport] " .. player.Name .. " does not have a valid position.")
        end
    elseif args == "coords" then
        -- Teleport player to specified coordinates
        local coords = Vector3.new(args:match("[-+]?%d*%.?%d+"), args:match("[-+]?%d*%.?%d+"), args:match("[-+]?%d*%.?%d+"))
        if coords then
            player.Character:SetPrimaryPartCFrame(CFrame.new(coords))
            print("[Teleport] " .. player.Name .. " teleported to coordinates: (" .. coords.X .. ", " .. coords.Y .. ", " .. coords.Z .. ")")
        else
            print("[Usage] " .. player.Name .. ": .goto <player name / me / coordinates>")
        end
    else
        print("[Usage] " .. player.Name .. ": .goto <player name / me / coordinates>")
    end
end, "<player name / me / coordinates>")

-- Command handler for leaving the game
KryptonManager:RegisterCommand("leavegame", function(player, args)
    -- Forcefully remove the player from the game
    player:Kick("Left the game by command.")
end, "")

-- Command handler for rejoining the game
KryptonManager:RegisterCommand("rejoingame", function(player, args)
    -- Store current place ID and rejoin
    local placeId = game.PlaceId
    local jobId = game.JobId
    player:LoadCharacter() -- Reset character before rejoining
    game:GetService("TeleportService"):TeleportToPlaceInstance(placeId, jobId, player)
end, "")

-- Connect the function to the PlayerChatted event (for old chat system)
game.Players.PlayerAdded:Connect(function(player)
    player.Chatted:Connect(function(message)
        onPlayerChatted(player, message)
    end)
end)

if game:GetService("RunService"):IsNewChatSystemEnabled() then
    -- Connect the function to the new OnChat event
    game.Players.PlayerAdded:Connect(function(player)
        player.OnChat:Connect(function(message, recipient)
            onPlayerChattedNew(player, message, recipient)
        end)
    end)
end