local Klein = require(Klein.KleinObject)

Klein("TextLabel") -- This serves as a template for a Textlabel without any properties.

local Klein = require(Klein.KleinObject)
local Component = require(Klein.Component)

-- We create a Component called Clock
local Clock = Component.new("Clock")

-- We call the Component's Template method, which requires a KleinObject (such as the TextLabel).
Clock:Template(Klein("TextLabel"))

-- Mount the Clock component. This will simply place a TextLabel in the workspace.
Clock:Mount(workspace)

local Clock = Component.new("Clock", {
  currentTime = 0,
})

Clock:Template(Klein("TextLabel", {
  Text = Clock.Data.currentTime -- The Text property will now update asynchronously whenever currentTime updates.
}))

Clock:Template(Klein("TextLabel", {
  Text = "Elapsed time: {{currentTime}}" -- Display the current time. This approach may change significantly in the future.
}))

-- This method runs after the component has mounted.
function Clock:AfterMount()
  self.running  = true
  
  -- Add 1 to the current time with each second.
  task.spawn(function()
    while self.running do
      self.Data.currentTime = self.Data.currentTime.Value   1
      task.wait(1)
    end
  end)
end

function Clock:BeforeDestroy()
  self.running = false
end

-- Current time will update to the count of 5, after which the loop in AfterMount ends.
Clock:Mount(workspace)
task.wait(5)
Clock:Destroy()

-- Our Component isn't visible yet to the user, since it's in workspace. We must put it in a screenGui first.
local Players = game:GetService("Players")
local Klein = require(Klein.KleinObject)
local Component = require(Klein.Component)
local Clock = Component.new("Clock" {
  currentTime = 1
})

Clock:Template(Klein("ScreenGui", {
  Klein("TextLabel", {
    Text = "Elapsed time: {{currentTime}}"
  }) -- We can add a child to the screengui by simply treating a KleinObject as a property of the screengui.
}))

-- Mount the screengui to PlayerGui with a textlabel as its child.
Clock:Mount(Players.LocalPlayer.PlayerGui)