module ApplicationHelper
  def nav_entry(body, path, options = {})
    options = {
      badge: nil,
      badge_color: nil,
      icon: nil,
      class: ''
    }.merge(options)

    classes = [
      "nav-item",
      current_page?(path) ? "active" : nil,
      options[:class]
    ].compact.join(" ")

    unless options[:icon].nil?
      body = "#{content_tag(:i, '', class: "mdi-#{options[:icon]}")} #{body}"
    end
    unless options[:badge].nil?
      # TODO: make this prettier?
      body << " #{
        content_tag(:span, options[:badge], class: ("badge#{
          " badge-#{options[:badge_color]}" unless options[:badge_color].nil?
        }"))}"
    end

    content_tag(:li, link_to(body.html_safe, path, class: "nav-link"), class: classes)
  end

  def list_group_item(body, path, options = {})
    options = {
      badge: nil,
      badge_color: nil,
      class: ''
    }.merge(options)

    classes = [
      "list-group-item",
      "list-group-item-action",
      current_page?(path) ? "active" : nil,
      options[:class]
    ].compact.join(" ")

    unless options[:badge].nil? or options[:badge] == 0
      # TODO: make this prettier?
      body << " #{
        content_tag(:span, options[:badge], class: ("badge#{
          " badge-#{options[:badge_color]}" unless options[:badge_color].nil?
        }"))}"
    end

    content_tag(:a, body.html_safe, href: path, class: classes)
  end

  def tooltip(body, tooltip_content, placement = "bottom")
    content_tag(:span, body, {title: tooltip_content, "data-toggle" => "tooltip", "data-placement" => placement} )
  end

  def time_tooltip(subject, placement = "bottom")
    tooltip time_ago_in_words(subject.created_at), localize(subject.created_at), placement
  end

  def hidespan(body, hide)
    content_tag(:span, body, class: hide)
  end

  ##
  #
  def bootstrap_color c
    case c
    when "error", "alert"
      "danger"
    when "notice"
      "info"
    else
      c
    end
  end

  def inbox_count
    return 0 unless user_signed_in?
    count = Inbox.select("COUNT(id) AS count")
                 .where(new: true)
                 .where(user_id: current_user.id)
                 .group(:user_id)
                 .order(:count)
                 .first
    return nil if count.nil?
    return nil unless count.count > 0
    count.count
  end

  def notification_count
    return 0 unless user_signed_in?
    count = Notification.for(current_user).where(new: true)
    return nil if count.nil?
    return nil unless count.count > 0
    count.count
  end

  def privileged?(user)
    ((!current_user.nil?) && ((current_user == user) || current_user.mod?)) ? true : false
  end

  def ios_web_app?
    user_agent = request.env['HTTP_USER_AGENT'] || 'Mozilla/5.0'
    # normal MobileSafari.app UA: Mozilla/5.0 (iPhone; CPU iPhone OS 8_1_1 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12B435 Safari/600.1.4
    # webapp UA: Mozilla/5.0 (iPhone; CPU iPhone OS 8_1_1 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Mobile/12B435
    return true if user_agent.match /^Mozilla\/\d+\.\d+ \(i(?:Phone|Pad|Pod); CPU(?:.*) like Mac OS X\)(?:.*) Mobile(?:\S*)$/
    false
  end

  def generate_title(name, junction = nil, content = nil, s = false)
    if s
      if name[-1].downcase != "s"
        name = name + "'s"
      else
        name = name + "'"
      end
    end

    list = [name]

    list.push junction unless junction.nil?

    unless content.nil?
      content = strip_markdown(content)
      if content.length > 45
        content = content[0..42] + "..."
      end
      list.push content
    end
    list.push "|", APP_CONFIG['site_name']

    list.join " "
  end

  def question_title(question)
    name = user_screen_name question.user, anonymous: question.author_is_anonymous, url: false
    generate_title name, "asked", question.content
  end

  def answer_title(answer)
    name = user_screen_name answer.user, anonymous: false, url: false
    generate_title name, "answered", answer.question.content
  end

  def user_title(user, junction = nil)
    name = user_screen_name user, anonymous: false, url: false
    generate_title name, junction, nil, !junction.nil?
  end

  def questions_title(user)
    user_title user, "questions"
  end

  def answers_title(user)
    user_title user, "answers"
  end

  def smiles_title(user)
    user_title user, "smiles"
  end

  def comments_title(user)
    user_title user, "comments"
  end

  def list_title(list)
    generate_title list.name
  end

  # Creates <meta> tags for OpenGraph properties from a hash
  # @param values [Hash]
  def opengraph_meta_tags(values)
    values.map { |name, content| tag(:meta, property: name, content: content) }.join("\n").html_safe
  end

  # Creates <meta> tags from a hash
  # @param values [Hash]
  def meta_tags(values)
    values.map { |name, content| tag(:meta, name: name, content: content) }.join("\n").html_safe
  end

  # @param user [User]
  def user_opengraph(user)
    opengraph_meta_tags({
      'og:title': user.display_name,
      'og:type': 'profile',
      'og:image': full_profile_picture_url(user),
      'og:url': show_user_profile_url(user.screen_name),
      'og:description': user.bio,
      'og:site_name': APP_CONFIG['site_name'],
      'profile:username': user.screen_name
    })
  end

  # @param user [User]
  def user_twitter_card(user)
    meta_tags({
      'twitter:card': 'summary',
      'twitter:site': '@retrospring',
      'twitter:title': user.motivation_header.presence || "Ask me anything!",
      'twitter:description': "Ask #{user.display_name} anything on Retrospring",
      'twitter:image': full_profile_picture_url(user)
    })
  end

  # @param answer [Answer]
  def answer_opengraph(answer)
    opengraph_meta_tags({
      'og:title': answer.question.content,
      'og:type': 'article',
      'og:image': full_profile_picture_url(answer.user),
      'og:url': show_user_answer_url(answer.user.screen_name, answer.id),
      'og:description': answer.content,
      'og:site_name': APP_CONFIG['site_name']
    })
  end

  def full_profile_picture_url(user)
    # @type [String]
    profile_picture_url = user.profile_picture.url(:large)
    if profile_picture_url.start_with? '/'
      "#{root_url}#{profile_picture_url[1..-1]}"
    else
      profile_picture_url
    end
  end
end