using CondaPkg
using PythonCall
using Images
using ImageView
import VideoIO
using GLMakie


##

VideoIO.TestVideos.available()
videoFile = VideoIO.TestVideos.testvideo("black_hole")
VideoIO.playvideo(videoFile)
close(videoFile)

##

cam = VideoIO.opencamera("/dev/video0")
img = read(cam)
# @show VideoIO.framerate(cam)
# cam |> close

try
  img = read(cam)
  obs_img = GLMakie.Observable(GLMakie.rotr90(img))
  scene = GLMakie.Scene(camera=GLMakie.campixel!, resolution=reverse(size(img)))
  GLMakie.image!(scene, obs_img)
  display(scene)
  fps = VideoIO.framerate(cam)
  while GLMakie.isopen(scene)
    img = read(cam)
    obs_img[] = GLMakie.rotr90(img)
    sleep(1 / fps)
  end
finally
  close(cam)
end

##

cam = VideoIO.opencamera("/dev/video0")
imgstack = []
secrec = 1
frames = 30*secrec
framecounter = 0
fps = VideoIO.framerate(cam)

try 
    # read the first image in start
    img = read(cam)
    obs_img = GLMakie.Observable(GLMakie.rotr90(img))
    scene = GLMakie.Scene(camera=GLMakie.campixel!, size=reverse(size(img)))
    # set the first image on screen of Makie window
    GLMakie.image!(scene, obs_img)
    # display the GLMakie scene
    display(scene)

     # until the window is open
    i = 0
    while GLMakie.isopen(scene)
        # read from camera
        img = read(cam)
        # we can process our image here
        # you should comment below 4 lines if don't wanna save
        # img = process(img)
        # push!(imgstack, img)
        # framecounter = framecounter + 1
        # if(framecounter == frames) break end

        # update image in the window
        # obs_img[] = GLMakie.rotr90(img)
        # delay to achieve right framerate
        # also when you don't delay, it ends up hanging everything as
        # it's a while loop with no control and huge number of reads.
        sleep(1e-6)
    end
finally
    close(cam)
end