defmodule Mix.Tasks.OpenResponses.Install do
  @moduledoc """
  Installs Open Responses into an existing Phoenix application.

  Usage:

      mix open_responses.install

  What this does:

  - Adds `OpenResponses.Responses` to your Ash domains config
  - Mounts `POST /v1/responses` in your router
  - Adds required children to your application supervisor
  - Creates a default provider config block in `config/runtime.exs`
  """

  use Igniter.Mix.Task

  @impl Igniter.Mix.Task
  def info(_argv, _composing_task) do
    %Igniter.Mix.Task.Info{
      installs: [],
      adds_deps: [{:cachex, "~> 3.6"}],
      extra_args?: false
    }
  end

  @impl Igniter.Mix.Task
  def igniter(igniter) do
    igniter
    |> add_ash_domain_to_config()
    |> add_supervisor_children()
    |> mount_router_scope()
    |> add_runtime_config()
  end

  defp add_ash_domain_to_config(igniter) do
    Igniter.Project.Config.configure(
      igniter,
      "config.exs",
      :open_responses,
      [:ash_domains],
      [OpenResponses.Responses]
    )
  end

  defp add_supervisor_children(igniter) do
    igniter
    |> Igniter.Project.Application.add_new_child({Cachex, name: :response_cache})
    |> Igniter.Project.Application.add_new_child(OpenResponses.LoopSupervisor)
  end

  defp mount_router_scope(igniter) do
    Igniter.Libs.Phoenix.add_scope(
      igniter,
      "/v1",
      """
      pipe_through :api
      post "/responses", OpenResponsesWeb.ResponseController, :create
      """,
      router: Igniter.Libs.Phoenix.select_router(igniter)
    )
  end

  defp add_runtime_config(igniter) do
    Igniter.Project.Config.configure(
      igniter,
      "runtime.exs",
      :open_responses,
      [:provider_config],
      %{
        openai: [api_key: {:env, "OPENAI_API_KEY"}],
        anthropic: [api_key: {:env, "ANTHROPIC_API_KEY"}],
        gemini: [api_key: {:env, "GEMINI_API_KEY"}]
      }
    )
  end
end