require "json"

module Krystalekeko
  extend self

  def download_url(url : String)
    downloads_folder = "./downloads/youtube"
    save_path = "#{downloads_folder}/%(title)s.%(ext)s"

    stdout = IO::Memory.new
    process = Process.new("./binaries/yt-dlp", [url, "-o", save_path, "-q", "--print-json"], output: stdout)
    status = process.wait

    ytp_dlp_result = stdout.to_s
    json_result = JSON.parse(ytp_dlp_result)

    title = json_result["title"]
    extension = json_result["ext"]

    resized_save_path = "#{downloads_folder}/#{title}-720p.mp4"
    ffmpeg_stdout = IO::Memory.new
    Process.run("./binaries/ffmpeg-5.1.1-amd64-static/ffmpeg", [
      "-i",
      "#{downloads_folder}/#{title}.#{extension}",
      "-c:v",
      "libx265",
      "-vf",
      "scale=1280:-2",
      resized_save_path,
    ], output: ffmpeg_stdout)
  end
end

Krystalekeko.download_url("https://www.youtube.com/watch?v=dSZshiYNOT4")