defmodule Mix.Tasks.Firebird.Phoenix.Gen do
  @moduledoc """
  Generate a Phoenix WASM application scaffold.

  Creates a ready-to-run project using Firebird's WASM-accelerated
  Phoenix components.

  ## Usage

      mix firebird.phoenix.gen my_app
      mix firebird.phoenix.gen my_app --module MyCustomModule
      mix firebird.phoenix.gen my_app --path /output/dir

  ## Options

  - `--module` - Custom module name (default: CamelCase of app_name)
  - `--path` - Output directory (default: ./app_name)

  ## Generated Files

      my_app/
      ├── lib/my_app/application.ex
      ├── lib/my_app/router.ex
      ├── lib/my_app/controllers/
      ├── lib/my_app/templates/
      ├── test/
      ├── config/config.exs
      ├── mix.exs
      └── README.md
  """

  use Mix.Task

  @shortdoc "Generate a Phoenix WASM application"

  @impl Mix.Task
  def run(args) do
    {opts, positional, _} =
      OptionParser.parse(args,
        strict: [module: :string, path: :string]
      )

    case positional do
      [app_name | _] ->
        generate(app_name, opts)

      [] ->
        Mix.shell().error(
          "Usage: mix firebird.phoenix.gen APP_NAME [--module MODULE] [--path PATH]"
        )
    end
  end

  defp generate(app_name, opts) do
    Mix.shell().info("🔥 Generating Phoenix WASM application: #{app_name}\n")

    case Firebird.Phoenix.Scaffold.generate(app_name, opts) do
      {:ok, path} ->
        Mix.shell().info("  ✅ Created #{path}/")
        Mix.shell().info("")
        Mix.shell().info("  Next steps:")
        Mix.shell().info("    cd #{app_name}")
        Mix.shell().info("    mix deps.get")
        Mix.shell().info("    mix test")
        Mix.shell().info("")

      {:error, reason} ->
        Mix.shell().error("  ❌ Error: #{inspect(reason)}")
    end
  end
end