pokemon.trade/app/controllers/api/graphql_controller.rb

# frozen_string_literal: true

class API::GraphqlController < API::ApplicationController
  def execute
    variables = ensure_hash(params[:variables])
    query = params[:query]
    operation_name = params[:operationName]
    context = {
      # Query context goes here, for example:
      # current_user: current_user,
    }

    render json: PokemonTradeSchema.execute(
      query,
      variables: variables,
      context: context,
      operation_name: operation_name,
    )
  rescue StandardError => e
    raise e unless Rails.env.development?

    handle_error_in_development(e)
  end

  private

  # Handle form data, JSON body, or a blank value
  def ensure_hash(ambiguous_param)
    case ambiguous_param
    when String
      if ambiguous_param.present?
        ensure_hash(JSON.parse(ambiguous_param))
      else
        {}
      end
    when Hash, ActionController::Parameters
      ambiguous_param
    when nil
      {}
    else
      raise ArgumentError, "Unexpected parameter: #{ambiguous_param}"
    end
  end

  def handle_error_in_development(err)
    logger.error err.message
    logger.error err.backtrace.join("\n")

    render json: {
      errors: [{message: err.message, backtrace: err.backtrace}],
      data: {},
    }, status: :internal_server_error
  end
end