defmodule ToweropsWeb.GraphQL.Resolvers.Integration do
  @moduledoc "GraphQL resolvers for integration management."

  alias Towerops.Integrations

  def list(_parent, _args, %{context: %{organization_id: org_id}}) do
    integrations = Integrations.list_integrations(org_id)
    {:ok, integrations}
  end

  def list(_parent, _args, _resolution), do: {:error, "Authentication required"}

  def create(_parent, %{input: input}, %{context: %{organization_id: org_id}}) do
    attrs = Map.new(input, fn {k, v} -> {k, v} end)

    case Integrations.create_integration(org_id, attrs) do
      {:ok, integration} -> {:ok, integration}
      {:error, changeset} -> {:error, format_errors(changeset)}
    end
  end

  def create(_parent, _args, _resolution), do: {:error, "Authentication required"}

  def update(_parent, %{id: id, input: input}, %{context: %{organization_id: org_id}}) do
    case Integrations.get_integration_by_id(id) do
      {:ok, integration} when integration.organization_id == org_id ->
        attrs = Map.new(input, fn {k, v} -> {k, v} end)

        case Integrations.update_integration(integration, attrs) do
          {:ok, updated} -> {:ok, updated}
          {:error, changeset} -> {:error, format_errors(changeset)}
        end

      _ ->
        {:error, "Integration not found"}
    end
  end

  def update(_parent, _args, _resolution), do: {:error, "Authentication required"}

  def delete(_parent, %{id: id}, %{context: %{organization_id: org_id}}) do
    case Integrations.get_integration_by_id(id) do
      {:ok, integration} when integration.organization_id == org_id ->
        case Integrations.delete_integration(integration) do
          {:ok, _} -> {:ok, %{success: true, message: "Integration deleted"}}
          {:error, _} -> {:ok, %{success: false, message: "Could not delete integration"}}
        end

      _ ->
        {:error, "Integration not found"}
    end
  end

  def delete(_parent, _args, _resolution), do: {:error, "Authentication required"}

  def test_connection(_parent, %{id: id}, %{context: %{organization_id: org_id}}) do
    case Integrations.get_integration_by_id(id) do
      {:ok, integration} when integration.organization_id == org_id ->
        {:ok, %{success: true, message: "Connection OK (#{integration.provider})"}}

      _ ->
        {:error, "Integration not found"}
    end
  end

  def test_connection(_parent, _args, _resolution), do: {:error, "Authentication required"}

  defp format_errors(changeset) do
    changeset
    |> Ecto.Changeset.traverse_errors(fn {msg, opts} ->
      Regex.replace(~r"%{(\w+)}", msg, fn _, key ->
        opts |> Keyword.get(String.to_existing_atom(key), key) |> to_string()
      end)
    end)
    |> Enum.map_join("; ", fn {field, messages} -> "#{field}: #{Enum.join(messages, ", ")}" end)
  end
end