defmodule Cmd.Upgrade do
  @behaviour Cmd

  @impl Cmd
  def spec do
    [
      upgrade: [
        name: "upgrade",
        about: "Upgrade fnord to the latest version",
        flags: [
          yes: [
            long: "--yes",
            short: "-y",
            help: "Automatically answer 'yes' to all prompts",
            default: false
          ]
        ]
      ]
    ]
  end

  @impl Cmd
  def run(opts, _subcommands, _unknown) do
    if UI.confirm("Do you want to upgrade to the latest version of fnord?", opts.yes) do
      System.cmd("mix", ["escript.install", "--force", "github", "sysread/fnord"],
        stderr_to_stdout: true,
        into: IO.stream(:stdio, :line)
      )
    else
      IO.puts("Cancelled")
    end
  end
end