# frozen_string_literal: true

# rubocop:disable Metrics/ClassLength
require_dependency "renalware/events"

module Renalware
  module Events
    class EventsController < BaseController
      include Renalware::Concerns::Pageable

      # HTML GET when rendering the new form
      # JS GET after user selects event type, prompting us to return event-specific form fields
      def new
        save_path_to_return_to
        render locals: {
          patient: patient,
          event: build_new_event,
          event_types: event_types
        }
      end

      def create
        event = new_event_for_patient(event_params)

        if event.save
          redirect_to return_url, notice: t(".success", model_name: "event")
        else
          flash.now[:error] = t(".failed", model_name: "event")
          render :new, locals: {
            patient: patient,
            event: event,
            event_types: event_types
          }
        end
      end

      def index
        events_query = EventQuery.new(patient: patient, query: query_params)
        events = events_query.call.page(page).per(per_page)
        authorize events
        events = EventsPresenter.new(patient, events)

        render locals: {
          events: events,
          query: events_query.search
        }
      end

      def edit
        render locals: {
          patient: patient,
          event: load_and_authorize_event_for_edit_or_update,
          event_types: []
        }
      end

      def update
        event = load_and_authorize_event_for_edit_or_update
        if event.update(event_params)
          redirect_to return_url, notice: t(".success", model_name: "event")
        else
          flash.now[:error] = failed_msg_for("event type")
          render :edit, locals: {
            patient: patient,
            event: event,
            event_types: []
          }
        end
      end

      protected

      def save_path_to_return_to
        return unless request.format == :html

        session[:return_to] ||= request.path
      end

      def return_url
        @return_url ||= begin
          path = session.delete(:return_to)
          path = nil if path == new_patient_event_path(patient)
          path || patient_events_path(patient)
        end
      end
      helper_method :return_url

      def load_and_authorize_event_for_edit_or_update
        event = Event.for_patient(patient).find(params[:id])
        authorize event
        event.disable_selection_of_event_type = true
        event
      end

      private

      def disable_selection_of_event_type?
        event_type_slug.present? && event_type.present?
      end

      def build_new_event
        event = new_event_for_patient
        event.date_time = Time.zone.now
        event.event_type = event_type
        # disable_selection_of_event_type is a virtual attribute
        event.disable_selection_of_event_type = disable_selection_of_event_type?
        event
      end

      def event_class
        event_type.event_class_name.constantize
      end

      def event_type
        return Events::Type.find(event_type_id) if event_type_id.present?
        return Events::Type.find_by!(slug: event_type_slug) if event_type_slug.present?

        Events::Type.new
      end

      def event_type_id
        @event_type_id ||= begin
          return event_params[:event_type_id] if params[:events_event]

          params[:event_type_id]
        end
      end

      def event_type_slug
        params[:slug]
      end

      def event_params
        params.require(:events_event)
              .permit(:event_type_id, :date_time, :description, :notes,
                      :disable_selection_of_event_type, document: [])
              .merge!(document: document_attributes)
              .merge!(by: current_user)
      end

      def document_attributes
        params.require(:events_event).fetch(:document, nil).try(:permit!)
      end

      def new_event_for_patient(params = {})
        event = event_class.new
        event.attributes = params
        # Need to set disable_selection_of_event_type explicitly rather than relying on the value
        # in the params which is a string eg "false" which actually evaluates to true!
        # i.e. (!!"false" == true)
        event.disable_selection_of_event_type = disable_selection_of_event_type?
        event.patient = patient
        authorize event
        event
      end

      def event_types
        Renalware::Events::Type.order(:name).map do |event_type|
          [
            event_type.name,
            event_type.id,
            {
              data: {
                source: new_patient_event_path(patient, event_type_id: event_type.id, format: :js)
              }
            }
          ]
        end
      end

      def query_params
        params.fetch(:q, {})
      end
    end
  end
end
# rubocop:enable Metrics/ClassLength