class Notifier < ApplicationMailer
  include ActionView::Helpers::AssetUrlHelper

  self.delivery_job = ActionMailer::MailDeliveryJob

  default :from => Settings.email_from,
          :return_path => Settings.email_return_path,
          :auto_submitted => "auto-generated"
  helper :application
  before_action :set_shared_template_vars
  before_action :attach_project_logo

  def signup_confirm(user, token)
    with_recipient_locale user do
      @url = url_for(:controller => "users", :action => "confirm",
                     :display_name => user.display_name,
                     :confirm_string => token.token)

      mail :to => user.email,
           :subject => I18n.t("notifier.signup_confirm.subject")
    end
  end

  def email_confirm(user, token)
    with_recipient_locale user do
      @address = user.new_email
      @url = url_for(:controller => "users", :action => "confirm_email",
                     :confirm_string => token.token)

      mail :to => user.new_email,
           :subject => I18n.t("notifier.email_confirm.subject")
    end
  end

  def lost_password(user, token)
    with_recipient_locale user do
      @url = url_for(:controller => "users", :action => "reset_password",
                     :token => token.token)

      mail :to => user.email,
           :subject => I18n.t("notifier.lost_password.subject")
    end
  end

  def gpx_success(trace, possible_points)
    with_recipient_locale trace.user do
      @trace_name = trace.name
      @trace_points = trace.size
      @trace_description = trace.description
      @trace_tags = trace.tags
      @possible_points = possible_points

      mail :to => trace.user.email,
           :subject => I18n.t("notifier.gpx_notification.success.subject")
    end
  end

  def gpx_failure(trace, error)
    with_recipient_locale trace.user do
      @trace_name = trace.name
      @trace_description = trace.description
      @trace_tags = trace.tags
      @error = error

      mail :to => trace.user.email,
           :subject => I18n.t("notifier.gpx_notification.failure.subject")
    end
  end

  def message_notification(message)
    with_recipient_locale message.recipient do
      @to_user = message.recipient.display_name
      @from_user = message.sender.display_name
      @text = message.body
      @title = message.title
      @readurl = message_url(message)
      @replyurl = message_reply_url(message)
      @author = @from_user

      attach_user_avatar(message.sender)

      mail :from => from_address(message.sender.display_name, "m", message.id, message.digest),
           :to => message.recipient.email,
           :subject => I18n.t("notifier.message_notification.subject_header", :subject => message.title)
    end
  end

  def diary_comment_notification(comment, recipient)
    with_recipient_locale recipient do
      @to_user = recipient.display_name
      @from_user = comment.user.display_name
      @text = comment.body
      @title = comment.diary_entry.title
      @readurl = diary_entry_url(comment.diary_entry.user, comment.diary_entry, :anchor => "comment#{comment.id}")
      @commenturl = diary_entry_url(comment.diary_entry.user, comment.diary_entry, :anchor => "newcomment")
      @replyurl = new_message_url(comment.user, :message => { :title => "Re: #{comment.diary_entry.title}" })
      @author = @from_user

      attach_user_avatar(comment.user)

      set_references("diary", comment.diary_entry)

      mail :from => from_address(comment.user.display_name, "c", comment.id, comment.digest, recipient.id),
           :to => recipient.email,
           :subject => I18n.t("notifier.diary_comment_notification.subject", :user => comment.user.display_name)
    end
  end

  def friend_notification(friend)
    with_recipient_locale friend.befriendee do
      @friend = friend
      @viewurl = user_url(@friend.befriender)
      @friendurl = url_for(:controller => "users", :action => "make_friend",
                           :display_name => @friend.befriender.display_name)
      @author = @friend.befriender.display_name

      attach_user_avatar(@friend.befriender)
      mail :to => friend.befriendee.email,
           :subject => I18n.t("notifier.friend_notification.subject", :user => friend.befriender.display_name)
    end
  end

  def note_comment_notification(comment, recipient)
    with_recipient_locale recipient do
      @noteurl = browse_note_url(comment.note)
      @place = Nominatim.describe_location(comment.note.lat, comment.note.lon, 14, I18n.locale)
      @comment = comment.body
      @owner = recipient == comment.note.author
      @event = comment.event

      @commenter = if comment.author
                     comment.author.display_name
                   else
                     I18n.t("notifier.note_comment_notification.anonymous")
                   end

      @author = @commenter
      attach_user_avatar(comment.author)

      set_references("note", comment.note)

      subject = if @owner
                  I18n.t("notifier.note_comment_notification.#{@event}.subject_own", :commenter => @commenter)
                else
                  I18n.t("notifier.note_comment_notification.#{@event}.subject_other", :commenter => @commenter)
                end

      mail :to => recipient.email, :subject => subject
    end
  end

  def changeset_comment_notification(comment, recipient)
    with_recipient_locale recipient do
      @to_user = recipient.display_name
      @changeset_url = changeset_url(comment.changeset)
      @comment = comment.body
      @owner = recipient == comment.changeset.user
      @commenter = comment.author.display_name
      @changeset_comment = comment.changeset.tags["comment"].presence
      @time = comment.created_at
      @changeset_author = comment.changeset.user.display_name
      @author = @commenter

      subject = if @owner
                  I18n.t("notifier.changeset_comment_notification.commented.subject_own", :commenter => @commenter)
                else
                  I18n.t("notifier.changeset_comment_notification.commented.subject_other", :commenter => @commenter)
                end

      attach_user_avatar(comment.author)

      set_references("changeset", comment.changeset)

      mail :to => recipient.email, :subject => subject
    end
  end

  private

  def set_shared_template_vars
    @root_url = root_url
  end

  def attach_project_logo
    attachments.inline["logo.png"] = File.read(Rails.root.join("app/assets/images/osm_logo_30.png"))
  end

  def attach_user_avatar(user)
    attachments.inline["avatar.png"] = user_avatar_file(user)
  end

  def user_avatar_file(user)
    avatar = user&.avatar
    if avatar&.attached?
      avatar.variant(:resize => "50x50>").blob.download
    else
      File.read(Rails.root.join("app/assets/images/avatar_small.png"))
    end
  end

  def with_recipient_locale(recipient)
    I18n.with_locale Locale.available.preferred(recipient.preferred_languages) do
      yield
    end
  end

  def from_address(name, type, id, digest, user_id = nil)
    if Settings.key?(:messages_domain) && domain = Settings.messages_domain
      if user_id
        "#{name} <#{type}-#{id}-#{user_id}-#{digest[0, 6]}@#{domain}>"
      else
        "#{name} <#{type}-#{id}-#{digest[0, 6]}@#{domain}>"
      end
    else
      Settings.email_from
    end
  end

  def set_references(scope, reference_object)
    ref = "osm-#{scope}-#{reference_object.id}@#{Settings.server_url}"

    headers["X-Entity-Ref-ID"] = ref
    headers["In-Reply-To"] = ref
    headers["References"] = ref
  end
end