defmodule Mix.Tasks.ExOkf.Validate do
  @shortdoc "Validate an OKF bundle"
  @moduledoc """
  Validates an OKF bundle and prints diagnostics.

      mix ex_okf.validate path/to/bundle

  Exits with status 1 when error-severity diagnostics are present.
  Warnings alone do not fail the run.
  """

  use Mix.Task

  @impl Mix.Task
  def run(args) do
    {opts, paths, _} = OptionParser.parse(args, strict: [quiet: :boolean])

    path = List.first(paths) || Mix.raise("Usage: mix ex_okf.validate PATH")

    {:ok, bundle} = ExOKF.load(path)
    {status, diags} = ExOKF.validate(bundle)
    counts = ExOKF.Diagnostics.counts(diags)

    unless opts[:quiet] do
      Mix.shell().info("Bundle: #{path}")
      Mix.shell().info("Concepts: #{ExOKF.Bundle.size(bundle)}")

      Mix.shell().info(
        "Diagnostics: #{counts.error} errors, #{counts.warning} warnings, #{counts.info} info"
      )

      formatted = ExOKF.Diagnostics.format(diags)
      if formatted != "", do: Mix.shell().info("\n" <> formatted)
    end

    if status == :error, do: System.halt(1), else: :ok
  end
end