class User < ApplicationRecord
  acts_as_reader

  # Include default devise modules. Others available are:
  # :omniauthable
  devise :database_authenticatable, :recoverable, :rememberable,
         :trackable, :lockable, :two_factor_authenticatable, :confirmable, :timeoutable

  # Marked as optional because we validate organisation_id below instead so that
  # the error message is linked to the right field on the form
  belongs_to :organisation, optional: true
  has_many :legacy_users
  has_many :bulk_uploads

  validates :name, presence: true
  validates :email, presence: true
  validates :email, uniqueness: { allow_blank: true, case_sensitive: true, if: :will_save_change_to_email? }
  validates :email, format: { with: Devise.email_regexp, allow_blank: true, if: :will_save_change_to_email? }
  validates :password, presence: { if: :password_required? }
  validates :password, length: { within: Devise.password_length, allow_blank: true }
  validates :password, confirmation: { if: :password_required? }

  after_validation :send_data_protection_confirmation_reminder, if: :is_dpo_changed?

  validates :organisation_id, presence: true
  validate :organisation_not_merged

  has_paper_trail ignore: %w[last_sign_in_at
                             current_sign_in_at
                             current_sign_in_ip
                             last_sign_in_ip
                             failed_attempts
                             unlock_token
                             locked_at
                             reset_password_token
                             reset_password_sent_at
                             remember_created_at
                             sign_in_count
                             updated_at]

  has_one_time_password(encrypted: true)

  auto_strip_attributes :name, squish: true

  ROLES = {
    data_provider: 1,
    data_coordinator: 2,
    support: 99,
  }.freeze

  enum role: ROLES

  scope :search_by_name, ->(name) { where("users.name ILIKE ?", "%#{name}%") }
  scope :search_by_email, ->(email) { where("email ILIKE ?", "%#{email}%") }
  scope :filter_by_active, -> { where(active: true) }
  scope :search_by, ->(param) { search_by_name(param).or(search_by_email(param)) }
  scope :sorted_by_organisation_and_role, -> { joins(:organisation).order("organisations.name", role: :desc, name: :asc) }
  scope :filter_by_status, lambda { |statuses, _user = nil|
    filtered_records = all
    scopes = []

    statuses.each do |status|
      status = status == "active" ? "active_status" : status
      status = status == "unconfirmed" ? "not_signed_in" : status
      if respond_to?(status, true)
        scopes << send(status)
      end
    end

    if scopes.any?
      filtered_records = filtered_records.merge(scopes.reduce(&:or))
    end

    filtered_records
  }
  scope :not_signed_in, -> { where(last_sign_in_at: nil, active: true) }
  scope :deactivated, -> { where(active: false) }
  scope :active_status, -> { where(active: true).where.not(last_sign_in_at: nil) }
  scope :visible, -> { where(discarded_at: nil) }

  def lettings_logs
    if support?
      LettingsLog.all
    else
      LettingsLog.filter_by_organisation(organisation.absorbed_organisations + [organisation])
    end
  end

  def sales_logs
    if support?
      SalesLog.all
    else
      SalesLog.filter_by_organisation(organisation.absorbed_organisations + [organisation])
    end
  end

  def owned_lettings_logs
    LettingsLog.filter_by_owning_organisation(organisation.absorbed_organisations + [organisation])
  end

  def managed_lettings_logs
    LettingsLog.filter_by_managing_organisation(organisation.absorbed_organisations + [organisation])
  end

  def owned_sales_logs
    SalesLog.filter_by_owning_organisation(organisation.absorbed_organisations + [organisation])
  end

  def managed_sales_logs
    SalesLog.filter_by_managing_organisation(organisation.absorbed_organisations + [organisation])
  end

  def schemes
    if support?
      Scheme.all
    else
      Scheme.filter_by_owning_organisation(organisation.absorbed_organisations + [organisation] + organisation.parent_organisations)
    end
  end

  def is_key_contact?
    is_key_contact
  end

  def is_key_contact!
    update(is_key_contact: true)
  end

  def is_data_protection_officer?
    is_dpo
  end

  def is_data_protection_officer!
    update!(is_dpo: true)
  end

  def deactivate!(reactivate_with_organisation: false)
    update!(
      active: false,
      confirmed_at: nil,
      sign_in_count: 0,
      initial_confirmation_sent: false,
      reactivate_with_organisation:,
    )
  end

  def reactivate!
    update!(
      active: true,
      reactivate_with_organisation: false,
    )
  end

  MFA_TEMPLATE_ID = "6bdf5ee1-8e01-4be1-b1f9-747061d8a24c".freeze
  RESET_PASSWORD_TEMPLATE_ID = "2c410c19-80a7-481c-a531-2bcb3264f8e6".freeze
  CONFIRMABLE_TEMPLATE_ID = "3fc2e3a7-0835-4b84-ab7a-ce51629eb614".freeze
  RECONFIRMABLE_TEMPLATE_ID = "bcdec787-f0a7-46e9-8d63-b3e0a06ee455".freeze
  BETA_ONBOARDING_TEMPLATE_ID = "b48bc2cd-5887-4611-8296-d0ab3ed0e7fd".freeze
  USER_REACTIVATED_TEMPLATE_ID = "ac45a899-490e-4f59-ae8d-1256fc0001f9".freeze
  FOR_OLD_EMAIL_CHANGED_BY_OTHER_USER_TEMPLATE_ID = "3eb80517-1051-4dfc-b4cc-cb18228a3829".freeze
  FOR_NEW_EMAIL_CHANGED_BY_OTHER_USER_TEMPLATE_ID = "0cdd0be1-7fa5-4808-8225-ae4c5a002352".freeze

  def reset_password_notify_template
    RESET_PASSWORD_TEMPLATE_ID
  end

  def confirmable_template
    if last_sign_in_at.present? && (unconfirmed_email.blank? || unconfirmed_email == email)
      USER_REACTIVATED_TEMPLATE_ID
    elsif was_migrated_from_softwire? && last_sign_in_at.blank?
      BETA_ONBOARDING_TEMPLATE_ID
    elsif initial_confirmation_sent && !confirmed?
      RECONFIRMABLE_TEMPLATE_ID
    else
      CONFIRMABLE_TEMPLATE_ID
    end
  end

  def was_migrated_from_softwire?
    legacy_users.any? || old_user_id.present?
  end

  def send_confirmation_instructions
    return unless active?

    super
    update!(initial_confirmation_sent: true)
  end

  def need_two_factor_authentication?(_request)
    return false if Rails.env.development?
    return false if Rails.env.review?

    support?
  end

  def send_two_factor_authentication_code(code)
    template_id = MFA_TEMPLATE_ID
    personalisation = { otp: code }
    DeviseNotifyMailer.new.send_email(email, template_id, personalisation)
  end

  def assignable_roles
    return {} unless data_coordinator? || support?
    return ROLES if support?

    ROLES.except(:support)
  end

  def logs_filters(specific_org: false)
    if (support? && !specific_org) || organisation.has_managing_agents? || organisation.has_stock_owners?
      %w[years status needstypes assigned_to user managing_organisation owning_organisation bulk_upload_id]
    else
      %w[years status needstypes assigned_to user bulk_upload_id]
    end
  end

  delegate :name, to: :organisation, prefix: true

  def self.download_attributes
    %w[id email name organisation_name role old_user_id is_dpo is_key_contact active sign_in_count last_sign_in_at]
  end

  def self.to_csv
    CSV.generate(headers: true) do |csv|
      csv << download_attributes

      all.find_each do |record|
        csv << download_attributes.map { |attr| record.public_send(attr) }
      end
    end
  end

  def can_toggle_active?(user)
    self != user && (support? || data_coordinator?)
  end

  def valid_for_authentication?
    super && active?
  end

  def editable_duplicate_lettings_logs_sets
    lettings_logs.after_date(FormHandler.instance.lettings_earliest_open_for_editing_collection_start_date).duplicate_sets(id).map { |array_str| array_str ? array_str.map(&:to_i) : [] }
  end

  def editable_duplicate_sales_logs_sets
    sales_logs.after_date(FormHandler.instance.sales_earliest_open_for_editing_collection_start_date).duplicate_sets(id).map { |array_str| array_str ? array_str.map(&:to_i) : [] }
  end

  def active_unread_notifications
    Notification.active.unread_by(self)
  end

  def newest_active_unread_notification
    active_unread_notifications.last
  end

  def status
    return :deleted if discarded_at.present?
    return :deactivated unless active
    return :unconfirmed unless confirmed?

    :active
  end

  def discard!
    update!(discarded_at: Time.zone.now)
  end

protected

  # Checks whether a password is needed or not. For validations only.
  # Passwords are always required if it's a new record, or if the password
  # or confirmation are being set somewhere.
  def password_required?
    !persisted? || !password.nil? || !password_confirmation.nil?
  end

private

  def organisation_not_merged
    if organisation&.merge_date.present? && organisation.merge_date < Time.zone.now
      errors.add :organisation_id, I18n.t("validations.organisation.merged")
    end
  end

  def send_data_protection_confirmation_reminder
    return unless persisted?
    return unless is_dpo?
    return if organisation.data_protection_confirmed?

    DataProtectionConfirmationMailer.send_confirmation_email(self).deliver_later
  end
end