if Code.ensure_loaded?(Igniter) do
  defmodule Mix.Tasks.ExPaymob.Install do
    @moduledoc """
    Installs ExPaymob configuration into your Phoenix project.

        mix ex_paymob.install

    ## What it does

    1. Adds base configuration to `config/config.exs`
    2. Adds runtime configuration to `config/runtime.exs`
    3. Adds test configuration to `config/test.exs`
    4. Adds `:ex_paymob` to formatter's `import_deps`
    5. Prints setup instructions for webhook routes
    """

    use Igniter.Mix.Task

    @impl true
    def info(_argv, _composing_task) do
      %Igniter.Mix.Task.Info{
        group: :ex_paymob,
        adds_deps: [],
        installs: [],
        example: "mix ex_paymob.install"
      }
    end

    @impl true
    def igniter(igniter) do
      app_name = Igniter.Project.Application.app_name(igniter)

      igniter
      |> setup_config(app_name)
      |> setup_runtime_config()
      |> setup_test_config()
      |> setup_formatter()
      |> add_notices()
    end

    defp setup_config(igniter, _app_name) do
      Igniter.Project.Config.configure(
        igniter,
        "config.exs",
        :ex_paymob,
        [:region],
        {:code, Sourceror.parse_string!(":egypt")}
      )
    end

    defp setup_runtime_config(igniter) do
      igniter
      |> Igniter.Project.Config.configure(
        "runtime.exs",
        :ex_paymob,
        [:secret_key],
        {:code,
         Sourceror.parse_string!(
           ~s[System.get_env("PAYMOB_SECRET_KEY") || raise "PAYMOB_SECRET_KEY not set"]
         )}
      )
      |> Igniter.Project.Config.configure(
        "runtime.exs",
        :ex_paymob,
        [:public_key],
        {:code, Sourceror.parse_string!(~s[System.get_env("PAYMOB_PUBLIC_KEY")])}
      )
      |> Igniter.Project.Config.configure(
        "runtime.exs",
        :ex_paymob,
        [:hmac_secret],
        {:code,
         Sourceror.parse_string!(
           ~s[System.get_env("PAYMOB_HMAC_SECRET") || raise "PAYMOB_HMAC_SECRET not set"]
         )}
      )
    end

    defp setup_test_config(igniter) do
      igniter
      |> Igniter.Project.Config.configure(
        "test.exs",
        :ex_paymob,
        [:secret_key],
        "test_secret_key"
      )
      |> Igniter.Project.Config.configure(
        "test.exs",
        :ex_paymob,
        [:public_key],
        "test_public_key"
      )
      |> Igniter.Project.Config.configure(
        "test.exs",
        :ex_paymob,
        [:hmac_secret],
        "test_hmac_secret"
      )
    end

    defp setup_formatter(igniter) do
      Igniter.Project.Formatter.import_dep(igniter, :ex_paymob)
    end

    defp add_notices(igniter) do
      Igniter.add_notice(igniter, """
      ExPaymob installed successfully!

      Next steps:

      1. Set environment variables:
         - PAYMOB_SECRET_KEY (required)
         - PAYMOB_PUBLIC_KEY (for checkout URLs)
         - PAYMOB_HMAC_SECRET (for webhook verification)

      2. Add webhook route to your router:

         # In your endpoint.ex, before Plug.Parsers:
         plug Plug.Parsers,
           parsers: [:json],
           pass: ["application/json"],
           json_decoder: Jason,
           body_reader: {ExPaymob.Plug.RawBodyReader, :read_body, []}

         # In your router.ex:
         scope "/webhooks" do
           pipe_through :api

           forward "/paymob", ExPaymob.Plug.WebhookPlug,
             handler: MyApp.PaymobWebhookHandler
         end

      3. Create your webhook handler:

         defmodule MyApp.PaymobWebhookHandler do
           def handle_event(conn, event) do
             # Process the Paymob event...
             conn
           end
         end

      4. For UAE region, add to config:
         config :ex_paymob, region: :uae
      """)
    end
  end
end