//gleam
import gleam/http
import gleam/http/request
import gleam/httpc

//Import firebase objects, document type
import error
import objects/document

//get_doc function to retrieve a document from Google's Firestore Database
pub fn get_doc(
  apikey apikey: String,
  apiver apiver: String,
  database database: String,
  doc doc: String,
  proj_id proj_id: String,
) -> Result(document.FireballDocument, error.FireballError) {
  //Init a request object
  case
    request.to(
      //Firestore url
      "https://firestore.googleapis.com/"
      //Firestore Web API version
      <> apiver
      <> "/projects/"
      //Project id
      <> proj_id
      <> "/databases/"
      //Database to use
      <> database
      <> "/documents/"
      //Document path
      <> doc
      <> "?key="
      //API Key for the google cloud project
      <> apikey,
    )
  {
    //Check output
    Ok(base_req) -> {
      //Add headers
      let req =
        //Add headers
        request.prepend_header(base_req, "Content-type", "application/json")
        //Set method
        |> request.set_method(http.Get)

      //Send the HTTP request to the server
      case httpc.send(req) {
        //Retrieve successful response
        Ok(resp) ->
          Ok(document.FireballDocument(data: resp.body, creation_time: ""))

        //Handle errors
        Error(_) ->
          Error(error.FireballError(err: "error while sending request"))
      }
    }

    //Handle errors
    Error(_) -> Error(error.FireballError(err: "error while forming request"))
  }
}