require 'schedule'

# This is the central ADL class, where are managed all events
class Event < ApplicationRecord
  extend SimpleCalendar
  include Schedule
  acts_as_taggable
  strip_attributes
  has_paper_trail ignore: %i[last_updated lock_version secret submitter
                             decision_time latitude longitude]

  belongs_to :region
  # This is the eventual scheduled first event
  belongs_to :event, optional: true
  has_many :notes, dependent: :destroy
  has_many :events, dependent: :destroy

  validates :title, presence: true
  validate :end_after_start
  RULES = %w[daily weekly monthly monthly_day].freeze
  validates :rule, inclusion: RULES, allow_nil: true
  validates :description, presence: true
  validates :city, presence: true
  validates :region, presence: true
  validates :url, allow_nil: true, format: %r{\Ahttps?:\/\/.*\..*\z}
  validates :contact, email: true, allow_nil: true
  validates :submitter, email: true, presence: true

  geocoded_by :full_address
  after_validation :geocode, if: (lambda do |obj|
    obj.address_changed? || obj.city_changed?
  end)

  # Mechanism to store some reason which can be used when sending notifications
  attr_accessor :reason

  before_create EventCallbacks
  after_create EventCallbacks

  before_update EventCallbacks
  after_update EventCallbacks

  after_destroy EventCallbacks

  scope :moderated, ->(*) { where moderated: true }
  scope :unmoderated, ->(*) { where moderated: false }
  scope :past, -> { where 'start_time <= ?', Time.zone.now }
  scope :future, -> { where '? <= end_time', Time.zone.now }
  scope :daylimit, ->(nb) { where 'end_time <= ?', nb.to_i.days.from_now }
  scope :year, (lambda do |year|
    where '? <= end_time and start_time <= ?',
          Date.new(year.to_i, 1, 1).beginning_of_week,
          Date.new(year.to_i, 12, 31).end_of_week.end_of_day
  end)
  scope :month, (lambda do |start_date|
    where '? <= end_time and start_time <= ?',
          start_date.to_date.beginning_of_month.beginning_of_week,
          start_date.to_date.end_of_month.end_of_week.end_of_day
  end)
  scope :period, (lambda do |year, week|
    start_date = Date.commercial(
      year.to_i,
      (week || (Time.zone.today + 7.days).cweek).to_i
    )
    where '? <= end_time and start_time <= ?',
          start_date, start_date.end_of_week.end_of_day
  end)
  scope :region, (lambda do |region|
    return if region == 'all'

    temp = Region.find region
    where region: [temp, temp.regions].flatten
  end)
  scope :locality, ->(locality) { where locality: locality }
  scope :tag, ->(tag) { tagged_with tag }
  scope :geo, -> { where 'latitude is not null and longitude is not null' }

  before_validation on: :create do
    self.submission_time = Time.zone.now
    self.decision_time = Time.zone.now

    # Populate submitter using contact info if absent
    self.submitter ||= contact
  end

  before_validation on: :update do
    self.latitude = nil if address_changed?
    self.longitude = nil if address_changed?
  end

  def full_address
    # Only uses the region if it is a sub-region and not a country
    [address, city, region.try(:region).present? ? region : nil,
     region.try(:region)].compact.join ', '
  end

  def hashtags
    tag_list.map { |tag| "##{tag.tr('-', '_').camelize :lower}" }
  end

  def description
    # Remove empty paragraphs, which are added by tinymce
    self[:description]&.remove '<p> </p>'
  end

  def to_s
    "#{start_time.to_date} #{city}: #{title} #{hashtags.join(' ')}"
  end

  def to_tweet
    url = Rails.application.routes.url_helpers.event_url(
      self,
      host: ActionMailer::Base.default_url_options[:host]
    )

    tweet = "#{self} #{url}"
    if tweet.size >= 140
      tweet = "#{tweet[0, tweet.rindex(/\s/, 140 - url.size)]} #{url}"
    end
    tweet
  end

  private

  def end_after_start
    errors.add :end_time, :before_start if
      end_time.present? && start_time.present? && end_time <= start_time
  end
end