module EventsHelper
  def link_to_author(event)
    author = event.author

    if author
      link_to author.name, user_path(author.username)
    else
      event.author_name
    end
  end

  def event_action_name(event)
    target =  if event.target_type
                if event.note?
                  event.note_target_type
                else
                  event.target_type.titleize.downcase
                end
              else
                'project'
              end

    [event.action_name, target].join(" ")
  end

  def event_filter_link(key, tooltip)
    key = key.to_s
    active = 'active' if @event_filter.active?(key)
    link_opts = {
      class: "event-filter-link",
      id:    "#{key}_event_filter",
      title: "Filter by #{tooltip.downcase}",
    }

    content_tag :li, class: active do
      link_to request.path, link_opts do
        content_tag(:span, ' ' + tooltip)
      end
    end
  end

  def icon_for_event
    {
      EventFilter.push     => 'upload',
      EventFilter.merged   => 'check-square-o',
      EventFilter.comments => 'comments',
      EventFilter.team     => 'user',
    }
  end

  def event_preposition(event)
    if event.push? || event.commented? || event.target
      "at"
    elsif event.milestone?
      "in"
    end
  end

  def event_feed_title(event)
    words = []
    words << event.author_name
    words << event_action_name(event)

    if event.push?
      words << event.ref_type
      words << event.ref_name
      words << "at"
    elsif event.commented?
      if event.note_commit?
        words << event.note_short_commit_id
      else
        words << "##{truncate event.note_target_iid}"
      end
      words << "at"
    elsif event.milestone?
      words << "##{event.target_iid}" if event.target_iid
      words << "in"
    elsif event.target
      words << "##{event.target_iid}:"
      words << event.target.title if event.target.respond_to?(:title)
      words << "at"
    end

    words << event.project_name

    words.join(" ")
  end

  def event_feed_url(event)
    if event.issue?
      namespace_project_issue_url(event.project.namespace, event.project,
                                  event.issue)
    elsif event.merge_request?
      namespace_project_merge_request_url(event.project.namespace,
                                          event.project, event.merge_request)
    elsif event.note? && event.note_commit?
      namespace_project_commit_url(event.project.namespace, event.project,
                                   event.note_target)
    elsif event.note?
      if event.note_target
        if event.note_commit?
          namespace_project_commit_path(event.project.namespace, event.project,
                                        event.note_commit_id,
                                        anchor: dom_id(event.target))
        elsif event.note_project_snippet?
          namespace_project_snippet_path(event.project.namespace,
                                         event.project, event.note_target)
        else
          event_note_target_path(event)
        end
      end
    elsif event.push?
      push_event_feed_url(event)
    end
  end

  def push_event_feed_url(event)
    if event.push_with_commits? && event.md_ref?
      if event.commits_count > 1
        namespace_project_compare_url(event.project.namespace, event.project,
                                      from: event.commit_from, to:
                                      event.commit_to)
      else
        namespace_project_commit_url(event.project.namespace, event.project,
                                     id: event.commit_to)
      end
    else
      namespace_project_commits_url(event.project.namespace, event.project,
                                    event.ref_name)
    end
  end

  def event_feed_summary(event)
    if event.issue?
      render "events/event_issue", issue: event.issue
    elsif event.push?
      render "events/event_push", event: event
    elsif event.merge_request?
      render "events/event_merge_request", merge_request: event.merge_request
    elsif event.note?
      render "events/event_note", note: event.note
    end
  end

  def event_note_target_path(event)
    if event.note? && event.note_commit?
      namespace_project_commit_path(event.project.namespace, event.project,
                                    event.note_target)
    else
      polymorphic_path([event.project.namespace.becomes(Namespace),
                        event.project, event.note_target],
                       anchor: dom_id(event.target))
    end
  end

  def event_note_title_html(event)
    if event.note_target
      if event.note_commit?
        link_to(
          namespace_project_commit_path(event.project.namespace, event.project,
                                        event.note_commit_id,
                                        anchor: dom_id(event.target)),
          class: "commit_short_id"
        ) do
          "#{event.note_target_type} #{event.note_short_commit_id}"
        end
      elsif event.note_project_snippet?
        link_to(namespace_project_snippet_path(event.project.namespace,
                                               event.project,
                                               event.note_target)) do
          "#{event.note_target_type} ##{truncate event.note_target_id}"
        end
      else
        link_to event_note_target_path(event) do
          "#{event.note_target_type} ##{truncate event.note_target_iid}"
        end
      end
    else
      content_tag :strong do
        "(deleted)"
      end
    end
  end

  def event_note(text, options = {})
    text = first_line_in_markdown(text, 150, options)
    sanitize(text, tags: %w(a img b pre code p span))
  end

  def event_commit_title(message)
    escape_once(truncate(message.split("\n").first, length: 70))
  rescue
    "--broken encoding"
  end

  def event_to_atom(xml, event)
    if event.proper?
      xml.entry do
        event_link = event_feed_url(event)
        event_title = event_feed_title(event)
        event_summary = event_feed_summary(event)

        xml.id      "tag:#{request.host},#{event.created_at.strftime("%Y-%m-%d")}:#{event.id}"
        xml.link    href: event_link
        xml.title   truncate(event_title, length: 80)
        xml.updated event.created_at.xmlschema
        xml.media   :thumbnail, width: "40", height: "40", url: image_url(avatar_icon(event.author_email))
        xml.author do |author|
          xml.name event.author_name
          xml.email event.author_email
        end

        xml.summary(type: "xhtml") { |x| x << event_summary unless event_summary.nil? }
      end
    end
  end
end