import os
import nanovg
import glfw, glew
import perf
import common
import icons

proc frameBufferSize*(window: ptr Window): tuple[w, h: int32] =
  var fbWidth, fbHeight: cint
  window.getFramebufferSize(fbWidth.addr, fbHeight.addr)

  return (w: fbWidth, h: fbHeight)

proc size*(window: ptr Window): tuple[w, h: int32] =
  var width, height: cint
  window.getWindowSize(width.addr, height.addr)

  return (w: width, h: height)

proc main =
  let
    fps = newGraph(RenderStyle.FPS, "Frame Time")
    cpuGraph = newGraph(RenderStyle.MS, "CPU Time")


  initHint(CONTEXT_VERSION_MAJOR, 3)
  initHint(CONTEXT_VERSION_MINOR, 2)
  when defined(macosx):
    initHint(OPENGL_FORWARD_COMPAT, 1)
  initHint(OPENGL_PROFILE, OPENGL_CORE_PROFILE)

  discard glfw.init()

  windowHint(CONTEXT_VERSION_MAJOR, 3)
  windowHint(CONTEXT_VERSION_MINOR, 2)
  when defined(macosx):
    windowHint(OPENGL_FORWARD_COMPAT, 1)
  windowHint(OPENGL_PROFILE, OPENGL_CORE_PROFILE)

  var w = createWindow(800, 600, "Minimal Nim-GLFW Example", nil, nil)
  w.makeContextCurrent()
  swapInterval(0)
  setTime(0)

  discard glew.init()
  let vg = nanovg.newContext()
  vg.loadFont(currentSourceDir()/"resources/Roboto-Regular.ttf", "sans")
  vg.loadFont(currentSourceDir()/"resources/Roboto-Bold.ttf", "sans-bold")
  vg.loadFont(currentSourceDir()/"resources/fa.ttf", "fa")
  var prevt = getTime()

  while not w.windowShouldClose().bool:
    let t = getTime()
    let dt = t - prevt
    prevt = t

    let fbSize = w.frameBufferSize()

    glViewPort(0, 0, fbSize.w, fbSize.h)

    glCullFace(GL_BACK)
    glFrontFace(GL_CCW)
    glClearColor(0.3, 0.3, 0.32, 1.0)
    glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT or GL_STENCIL_BUFFER_BIT)

    vg.withFrame(w):
      let x = vg.glyphPositions("Some仮名thing is up", 0, 0)
      vg.drawWindow("Title", 50, 50, 300, 400)
      vg.drawLabel("Hello!", 10, 10, 280, 20)
      vg.drawButton(Icon.Trash, "Delete", 100, 200, 160, 28, rgba(128, 16, 8, 255))
      vg.drawButton(Icon.Trash, "Deleter", 100, 250, 160, 28, rgba(12, 130, 80, 255))
      vg.drawButton("Testing", 100, 300)

      vg.render(fps, 5, 5)
      vg.render(cpuGraph, 210, 5)

    w.swapBuffers()
    pollEvents()

    let cpuTime = glfw.getTime() - t

    fps.update(dt)
    cpuGraph.update(cpuTime)
    waitEvents()

  w.destroyWindow()
  vg.delete()
  glfw.terminate()

main()