roshiro/openws_one

# Controller to handle General Document actions
class GeneralDocumentsController < ApplicationController
  # Receive calls without passing CSRF token
  protect_from_forgery with: :null_session
  skip_before_filter :verify_authenticity_token

  # Creates a document in the given collection.
  def create
    begin
      created_object = persist_in_collection
      render json: created_object, status: 201
    rescue JSON::ParserError
      render json: { msg: 'Invalid JSON' }, status: 400
    rescue => e
      render json: { msg: e.message }, status: 400
    end
  end

  # Returns all the documents from the given collection
  def show
    if Openws::GeneralDocument.with(collection: namespaced_collection).exists?
      render json: Openws::GeneralDocument.with(collection: namespaced_collection).all
    else
      render json: { msg: 'Invalid collection' }, status: 400
    end
  end

  # Returns the document from the given collection
  def search_by_id
    begin
      result = Openws::GeneralDocument.with(collection: namespaced_collection).find(params[:id])
      render json: result, status: 200
    rescue
      render json: { msg: 'Document not found' }, status: 404
    end
  end

  # Destroys the document by ID.
  def destroy_by_id
    begin
      Openws::GeneralDocument.with({collection: namespaced_collection}).where(id: params[:id]).delete
      render json: nil, status: 201
    rescue
      render json: { msg: 'Document not found' }, status: 404
    end
  end

  # Updates the given document
  def update
    begin
      document = Openws::GeneralDocument.with(collection: namespaced_collection).find(params[:id])
      new_values = JSON.parse(request.body.read).except("id").except("_id")
      # .with is atomic, so it does not remember the collection to use
      # For that reason we need to remind mongo what collection to use
      document.with(collection: namespaced_collection).update_attributes!(new_values)
      render json: document, status: 200
    rescue
      render json: { msg: 'Document not found' }, status: 404
    end
  end

  private

  def persist_in_collection
    body_content = JSON.parse(request.body.read)

    raise 'JSON cannot be empty' if body_content.empty?

    raise 'Invalid collection name' unless StorageValidations.collection_name_valid?(params[:collection_name])

    Openws::GeneralDocument
      .with(collection: namespaced_collection)
      .create!(body_content)
  end

  def namespaced_collection
    Openws::GeneralDocument.namespaced_collection(params[:collection_name])
  end
end