defmodule Mix.Tasks.Kvasir.Dev do
  use Mix.Task

  @impl Mix.Task
  def run(args)

  def run([command | args]) do
    case command do
      "add" ->
        add(args)

      "update" ->
        update(args)

      _ ->
        # warn: commaand
        help()
    end
  end

  def run(_), do: help()

  defp add([component | opts]) do
    :application.ensure_all_started(:hackney)
    Kvasir.Dev.Downloader.clear(component)

    p =
      if c = List.first(opts) do
        if(String.trim(c) != "", do: c)
      end

    with :ok <- Kvasir.Dev.Downloader.component(component, p) do
      c = Kvasir.Dev.Downloader.commit(component)
      f = Kvasir.Dev.lock()

      lock = File.read!(f)

      data =
        lock
        |> String.split("\n", trim: true)
        |> Enum.map(&String.trim/1)
        |> Enum.reject(&(&1 == ""))
        |> Enum.reject(&String.starts_with?(&1, "#{component}:"))
        |> Kernel.++(["#{component}:#{c}"])
        |> Enum.sort()

      File.write(f, Enum.join(data, "\n") <> "\n")
    end
  end

  defp update(["all" | _]) do
    Kvasir.Dev.lock()
    |> File.read!()
    |> String.split("\n", trim: true)
    |> Enum.map(&String.trim/1)
    |> Enum.reject(&(&1 == ""))
    |> Enum.map(&List.first(String.split(&1, ":")))
    |> Enum.each(&add([&1, "release/v1.0"]))
  end

  defp update([component | _]), do: add([component, "release/v1.0"])

  defp help do
    :ok
  end
end