Write a JAVA program that stores and displays the on-duty schedule for a team. F

Question

Write a JAVA program that stores and displays the on-duty schedule for a team.

Features

Display today’s Support Hero.

Display a single user’s schedule showing the days they are assigned to Support

Hero.

Display the full schedule for all users in the current month.

Users should be able to mark one of their days on duty as undoable

The system should reschedule accordingly

Should take into account weekends and California’s holidays.

Users should be able to swap duty with another user’s specific day

STARTING ORDER

[''Sherry'', ''Boris'', ''Vicente'', ''Matte'', ''Jack'', ''Sherry'',

''Matte'', ''Kevin'', ''Kevin'', ''Vicente'', ''Zoe'', ''Kevin'',

''Matte'', ''Zoe'', ''Jay'', ''Boris'', ''Eadon'', ''Sherry'',

''Franky'', ''Sherry'', ''Matte'', ''Franky'', ''Franky'', ''Kevin'',

''Boris'', ''Franky'', ''Vicente'', ''Luis'', ''Eadon'', ''Boris'',

''Kevin'', ''Matte'', ''Jay'', ''James'', ''Kevin'', ''Sherry'',

''Sherry'', ''Jack'', ''Sherry'', ''Jack'']

Explanation / Answer

Ans:

require 'active_record'
require 'logger'
require 'holidays'
require 'holidays/us'

ActiveRecord::Base.establish_connection adapter: 'sqlite3', database: ':memory:'
ActiveRecord::Base.logger = Logger.new $stdout
ActiveSupport::LogSubscriber.colorize_logging = false

ActiveRecord::Schema.define do
self.verbose = false
  
create_table "shifts", force: :cascade do |t|
t.string "date"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "user_id"
end

create_table "users", force: :cascade do |t|
t.string "name"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "password_digest", default: "pw"
t.integer "role", default: "hero"
end
end

class Shift < ActiveRecord::Base
belongs_to :user
end

class User < ActiveRecord::Base
has_many :shifts
enum role: %w(hero admin)
has_secure_password
end

class ShiftDates
def initialize(from:)
self.from = from
end

include Enumerable

def each
return to_enum :each unless block_given?
current = from()
loop do
yield current if shift? current
current += 1
end
end
  
private

attr_accessor :from

def shift?(date)
weekday?(date) && !holiday?(date)
end

def holiday?(date)
Holidays.on(date, :observed).any?
end
  
def weekday?(date)
monday = 1
friday = 5
monday <= date.wday && date.wday <= friday
end
end

shift_queue = ['Sherry', 'Boris', 'Vicente', 'Matte', 'Jack', 'Sherry','Matte', 'Kevin', 'Kevin', 'Vicente', 'Zoe', 'Kevin','Matte', 'Zoe', 'Jay', 'Boris', 'Eadon', 'Sherry','Franky', 'Sherry', 'Matte', 'Franky', 'Franky', 'Kevin','Boris', 'Franky', 'Vicente', 'Luis', 'Eadon', 'Boris','Kevin', 'Matte', 'Jay', 'James', 'Kevin', 'Sherry','Sherry', 'Jack', 'Sherry', 'Jack']]

users_by_name = ActiveRecord::Base.transaction do
shift_queue.uniq.each_with_object({}) do |name, result|
result[name] = User.create! name: name
end
end

dates = ShiftDates.new(from: Date.today)

timestamp = Time.current
values = shift_queue.zip(dates).map { |name, date| "('#{date.to_date.to_s(:db)}', #{User.find_by(name: name).id}, '#{timestamp.to_s(:db)}', '#{timestamp.to_s(:db)}')" }.join(", ")

Shift.connection.execute "INSERT INTO shifts (`date`, `user_id`, `updated_at`, `created_at`) VALUES #{values}"

Shift.count
Shift.first.user.shifts

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