# Default policy:
# 1. Removes the account if the email is empty
# 2. Adds the defined default_usergroup if user does not have policy groups
# 3. Adds the defined default_login_method if update includes empty login methods
class Eco::API::Policies::DefaultPolicies::UserAccess < Eco::API::Common::Loaders::Policy
  name "default-user-access"

  attr_reader   :session, :options, :job
  attr_accessor :account_removed_count

  def main(people, session, options, policy, job)
    @session = session; @options = options; @job = job

    self.account_removed_count = 0

    people.each do |person|
      remove_account_when_no_email!(person) if person.email.to_s.empty?
      next unless account = person.account
      if account.policy_group_ids.empty? && def_pg
        account.policy_group_ids = [def_pg]
      end
      add_login_method_if_applicable!(account)
    end

    warn_account_removal!
  end

  private

  def warn_account_removal!
    if account_removed_count > 0
      msg = "(DefaultPolicy on job '#{job.name}') Removed account to #{account_removed_count} people"
      session.logger.info(msg)
    end
  end

  def remove_account_when_no_email!(person)
    if person.account
      self.account_removed_count += 1 if had_account?(person)
      person.account = nil
    end
  end

  def had_account?(person)
    return false if person.new?
    return false if person.account_added?
    return !!person.original_doc["account"]
  end

  def add_login_method_if_applicable!(account)
    return unless account.as_update.key?("login_provider_ids")
    if account.login_provider_ids.empty? && def_login
      account.login_provider_ids = [def_login]
    end
  end

  def def_pg
    @def_pg ||= policy_groups.to_id(default_group)
  end

  def def_login
    @def_login ||= login_providers.to_id(default_login)
  end

  def default_group
    config.people.default_usergroup
  end

  def default_login
    config.people.default_login_method
  end

  def login_providers
    session.login_providers
  end

  def policy_groups
    session.policy_groups
  end
end