Add function to get embeddings for arbitrary string

lib/open_ai.ex

@@ -1,8 +1,10 @@
 defmodule OpenAI do
+  alias OpenAI.API
+
   def gpt(completion) do
     {:ok, collector} = Agent.start_link(fn -> "" end)
 
-    gpt_stream(completion, fn data ->
+    API.gpt_stream(completion, fn data ->
       case get_in(data, ["choices", Access.at(0), "delta", "content"]) do
         nil -> :ok
         data -> Agent.update(collector, fn current -> current <> data end)
@@ -13,58 +15,4 @@ defmodule OpenAI do
     Agent.stop(collector)
     {:ok, result}
   end
-
-  # Lifted from https://fly.io/phoenix-files/streaming-openai-responses/
-  defp gpt_stream(completion, cb) do
-    fun = fn request, finch_request, finch_name, finch_options ->
-      fun = fn
-        {:status, status}, response ->
-          %{response | status: status}
-
-        {:headers, headers}, response ->
-          %{response | headers: headers}
-
-        {:data, data}, response ->
-          body =
-            data
-            |> String.split("data: ")
-            |> Enum.map(fn str ->
-              str
-              |> String.trim()
-              |> decode_body(cb)
-            end)
-            |> Enum.filter(fn d -> d != :ok end)
-
-          old_body = if response.body == "", do: [], else: response.body
-
-          %{response | body: old_body ++ body}
-      end
-
-      case Finch.stream(finch_request, finch_name, Req.Response.new(), fun, finch_options) do
-        {:ok, response} -> {request, response}
-        {:error, exception} -> {request, exception}
-      end
-    end
-
-    Req.post!("https://api.openai.com/v1/chat/completions",
-      json: %{
-        model: "gpt-4o-mini",
-        messages: [Map.take(completion, [:content, :role])],
-        response_format: %{type: "json_object"},
-        stream: true,
-        temperature: completion.temperature
-      },
-      auth: {:bearer, api_key()},
-      finch_request: fun
-    )
-  end
-
-  defp decode_body("", _), do: :ok
-  defp decode_body("[DONE]", _), do: :ok
-  defp decode_body(json, cb), do: cb.(Jason.decode!(json))
-
-  defp api_key do
-    Application.get_env(:music_library, OpenAI)
-    |> Keyword.fetch!(:api_key)
-  end
 end