(back) generate ICS file for a reservation

CHANGELOG.md

@@ -15,6 +15,7 @@
 - Updated typescript to v4.6.3
 - Updated react-select to v5.2.2
 - Updated sidekiq-scheduler to v4.0.0
+- Updated icalendar to 2.7.1
 - Webpack overlay will now report eslint issues
 - Linted all code according to eslint rules
 - when generating an avoir, the option "by_wallet" is not present anymore if wallet module is off

Gemfile.lock

@@ -169,9 +169,9 @@ GEM
     httpclient (2.8.3)
     i18n (1.10.0)
       concurrent-ruby (~> 1.0)
-    icalendar (2.5.3)
+    icalendar (2.7.1)
       ice_cube (~> 0.16)
-    ice_cube (0.16.3)
+    ice_cube (0.16.4)
     ice_nine (0.11.2)
     image_processing (1.12.2)
       mini_magick (>= 4.9.5, < 5)

app/frontend/src/javascript/lib/user.ts

@@ -3,7 +3,7 @@ import { User } from '../models/user';
 import { supportedNetworks, SupportedSocialNetwork } from '../models/social-network';
 
 export default class UserLib {
-  private user: User;
+  private readonly user: User;
 
   constructor (user: User) {
     this.user = user;

app/mailers/notifications_mailer.rb

@@ -52,4 +52,11 @@ class NotificationsMailer < NotifyWith::NotificationsMailer
          subject: t('notifications_mailer.notify_member_payment_schedule_ready.subject'),
          template_name: 'notify_member_payment_schedule_ready')
   end
+
+  def notify_member_create_reservation
+    attachments[@attached_object]
+    mail(to: @recipient.email,
+         subject: t('notifications_mailer.notify_member_create_reservation.subject'),
+         template_name: 'notify_member_create_reservation')
+  end
 end

app/models/reservation.rb

@@ -67,6 +67,32 @@ class Reservation < ApplicationRecord
                  .first
   end
 
+  def to_ics
+    ReservationService.build_ics(self)
+  end
+
+  # Group all slots related to this reservation by dates and by continuous time ranges
+  def grouped_slots
+    slots_by_date = slots.group_by { |slot| slot[:start_at].to_date }.transform_values { |slots| slots.sort_by { |slot| slot[:start_at] } }
+    result = {}
+    slots_by_date.each do |date, daily_slots|
+      result[date] = { daily_slots.first[:start_at] => [daily_slots.first] }
+
+      daily_slots[1..].each do |slot|
+        found = false
+        result[date].each do |group_start, group_slots|
+          if slot[:start_at] === group_slots.last[:end_at]
+            result[date][group_start].push(slot)
+            found = true
+            break
+          end
+        end
+        result[date][slot[:start_at]] = [slot] unless found
+      end
+    end
+    result
+  end
+
   private
 
   def machine_not_already_reserved

app/services/reservation_service.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+# Provides methods around the Reservation objects
+class ReservationService
+  class << self
+    def build_ics(reservation)
+      require 'icalendar'
+
+      cal = Icalendar::Calendar.new
+      reservation.grouped_slots.each do |date, daily_groups|
+        daily_groups.each do |start_time, group_slots|
+          cal.event do |e|
+            e.dtstart     = start_time
+            e.dtend       = group_slots.last[:end_at]
+            e.summary     = I18n.t('reservation_ics.summary', TYPE: I18n.t("reservation_ics.type.#{reservation.reservable.class.name}"))
+            e.description = I18n.t('reservation_ics.description', COUNT: group_slots.count, ITEM: reservation.reservable.name)
+            e.ip_class    = "PRIVATE"
+          end
+        end
+      end
+
+      cal.to_ical
+    end
+  end
+end

config/locales/en.yml

@@ -244,6 +244,14 @@ en:
     event: "Event"
     reservations: "Reservations"
     available_seats: "Available seats"
+  reservation_ics:
+    summary: "%{TYPE} reservation"
+    type:
+      Machine: "Machine"
+      Space: "Space"
+      Event: "Event"
+      Training: "Training"
+    description: "You have reserved %{COUNT} slots of %{ITEM}"
   roles:
     member: "Member"
     manager: "Manager"