using GLFW
using NanoVG
using ModernGL

function main()
   title = "NanoVG Basic Example"
   width = 800
   height = 600

   window = GLFW.CreateWindow(width, height, title)
   @assert window.handle != C_NULL "Could not create a GLFW window 😢"

   GLFW.MakeContextCurrent(window)

   # Create the NanoVG context with the GL3 implementation
   NanoVG.create(NanoVG.GL3, antialiasing=true)

   while true
      if GLFW.WindowShouldClose(window) break end
      # get the framebuffer size
      width, height = GLFW.GetFramebufferSize(window)
      # get the window size
      winWidth, winHeight = GLFW.GetWindowSize(window)
      # dpr = device pixel ratio
      dpr = width / winWidth
      # set the viewport
      glViewport(0, 0, width, height)
      # create a new frame
      NanoVG.frame(winWidth, winHeight, dpr)
      # drawing functions should be called here
      
      # set the fill color
      fillcolor(rgb(128, 32, 56))
      # draw a filled circle at the center of the screen
      circle(width/2, height/2, 128, :fill)

      # render the frame to the screen
      NanoVG.render()

      GLFW.SwapBuffers(window)
      GLFW.PollEvents()
   end

   NanoVG.dispose()
   GLFW.DestroyWindow(window)
end

main()