defmodule Mix.Tasks.Firebird.Target.Status do
  @moduledoc """
  Show the status of the WASM compilation target.

  Displays discovered sources, compiled artifacts, configuration,
  and prerequisite status.

  ## Usage

      mix firebird.target.status
      mix firebird.target.status --json
  """

  use Mix.Task

  @shortdoc "Show WASM target compilation status"

  @switches [
    output: :string,
    dirs: :string,
    json: :boolean
  ]

  @impl Mix.Task
  def run(args) do
    {opts, _rest, _invalid} = OptionParser.parse(args, switches: @switches)

    config = Firebird.Target.Config.from_mix_project()

    config =
      case Keyword.get(opts, :output) do
        nil -> config
        dir -> %{config | output_dir: dir}
      end

    config =
      case Keyword.get(opts, :dirs) do
        nil -> config
        dirs -> %{config | sources: String.split(dirs, ",", trim: true)}
      end

    status = Firebird.Target.status(config)

    if Keyword.get(opts, :json, false) do
      Mix.shell().info(Jason.encode!(status, pretty: true))
    else
      print_status(status)
    end

    :ok
  end

  defp print_status(status) do
    Mix.shell().info("🔥 Firebird WASM Target Status")
    Mix.shell().info("")

    # Prerequisites
    prereqs = status.prerequisites
    Mix.shell().info("  Prerequisites:")

    Mix.shell().info(
      "    wat2wasm:  #{if prereqs.wat2wasm, do: "✅ installed", else: "❌ not found"}"
    )

    Mix.shell().info("    Elixir:    #{prereqs.elixir_version}")
    Mix.shell().info("    OTP:       #{prereqs.otp_version}")
    Mix.shell().info("")

    # Sources
    Mix.shell().info("  Sources: #{status.sources} file(s)")

    Enum.each(status.source_files, fn f ->
      Mix.shell().info("    📄 #{f}")
    end)

    Mix.shell().info("")

    # Artifacts
    artifacts = status.artifacts
    Mix.shell().info("  Output: #{status.output_dir}/")
    Mix.shell().info("    WAT files:  #{artifacts.wat_count}")
    Mix.shell().info("    WASM files: #{artifacts.wasm_count}")
    Mix.shell().info("")

    # Config
    config = status.config
    Mix.shell().info("  Configuration:")
    Mix.shell().info("    optimize:   #{config.optimize}")
    Mix.shell().info("    tco:        #{config.tco}")
    Mix.shell().info("    inline:     #{config.inline}")
    Mix.shell().info("    wat_only:   #{config.wat_only}")
    Mix.shell().info("    source_map: #{config.source_map}")
  end
end