# frozen_string_literal: true

# Redmine - project management software
# Copyright (C) 2006-  Jean-Philippe Lang
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

class EmailAddress < ApplicationRecord
  include Redmine::SafeAttributes

  belongs_to :user

  after_update :destroy_tokens
  after_destroy :destroy_tokens

  after_create_commit :deliver_security_notification_create
  after_update_commit :deliver_security_notification_update
  after_destroy_commit :deliver_security_notification_destroy

  validates_presence_of :address
  validates_format_of :address, :with => URI::MailTo::EMAIL_REGEXP, :allow_blank => true
  validates_length_of :address, :maximum => User::MAIL_LENGTH_LIMIT, :allow_nil => true
  validates_uniqueness_of :address, :case_sensitive => false,
    :if => Proc.new {|email| email.address_changed? && email.address.present?}
  validate :validate_email_domain, :if => proc {|email| email.address.present?}

  normalizes :address, with: lambda { |address|
    normalized_address = address.to_s.strip
    local_part, _at, domain = normalized_address.partition('@')
    if domain.present?
      # Convert internationalized domain name (IDN) to Punycode
      # e.g. 'marie@société.example' => 'marie@xn--socit-esab.example'
      ascii_domain = Addressable::IDNA.to_ascii(domain)
      normalized_address = "#{local_part}@#{ascii_domain}"
    end
    normalized_address
  }

  safe_attributes 'address'

  def destroy
    if is_default?
      false
    else
      super
    end
  end

  # Returns true if the email domain is allowed regarding allowed/denied
  # domains defined in application settings, otherwise false
  def self.valid_domain?(domain_or_email)
    denied, allowed =
      [:email_domains_denied, :email_domains_allowed].map do |setting|
        Setting.__send__(setting)
      end
    domain = domain_or_email.split('@').last
    return false if denied.present? && domain_in?(domain, denied)
    return false if allowed.present? && !domain_in?(domain, allowed)

    true
  end

  # Returns true if domain belongs to domains list.
  def self.domain_in?(domain, domains)
    domain = domain.to_s.downcase
    domains = domains.to_s.split(/[\s,]+/) unless domains.is_a?(Array)
    domains.reject(&:blank?).map(&:downcase).any? do |s|
      s.start_with?('.') ? domain.end_with?(s) : domain == s
    end
  end

  private

  # send a security notification to user that a new email address was added
  def deliver_security_notification_create
    # only deliver if this isn't the only address.
    # in that case, the user is just being created and
    # should not receive this email.
    if user.mails != [address]
      deliver_security_notification(
        message: :mail_body_security_notification_add,
        field: :field_mail,
        value: address
      )
    end
  end

  # send a security notification to user that an email has been changed (notified/not notified)
  def deliver_security_notification_update
    if saved_change_to_address?
      options = {
        recipients: [address_before_last_save],
        message: :mail_body_security_notification_change_to,
        field: :field_mail,
        value: address
      }
    elsif saved_change_to_notify?
      options = {
        recipients: [address],
        message: notify_before_last_save ? :mail_body_security_notification_notify_disabled : :mail_body_security_notification_notify_enabled,
        value: address
      }
    end
    deliver_security_notification(options)
  end

  # send a security notification to user that an email address was deleted
  def deliver_security_notification_destroy
    deliver_security_notification(
      recipients: [address],
      message: :mail_body_security_notification_remove,
      field: :field_mail,
      value: address
    )
  end

  # generic method to send security notifications for email addresses
  def deliver_security_notification(options={})
    Mailer.deliver_security_notification(
      user,
      User.current,
      options.merge(
        title: :label_my_account,
        url: {controller: 'my', action: 'account'}
      )
    )
  end

  # Delete all outstanding password reset tokens on email change.
  # This helps to keep the account secure in case the associated email account
  # was compromised.
  def destroy_tokens
    if saved_change_to_address? || destroyed?
      tokens = ['recovery']
      Token.where(:user_id => user_id, :action => tokens).delete_all
    end
  end

  def validate_email_domain
    domain = address.partition('@').last
    # Skip domain validation if the email does not contain a domain part,
    # to avoid an incomplete error message like "domain not allowed ()"
    return if domain.empty?

    return if self.class.valid_domain?(domain)

    if User.current.logged?
      errors.add(:address, :domain_not_allowed, :domain => domain)
    else
      # Don't display a detailed error message for anonymous users
      errors.add(:address, :invalid)
    end
  end
end
