class StoriesController < ApplicationController
  DEFAULT_HOME_FEED_ATTRIBUTES_FOR_SERIALIZATION = {
    only: %i[
      title path id user_id comments_count positive_reactions_count organization_id
      reading_time video_thumbnail_url video video_duration_in_minutes language
      experience_level_rating experience_level_rating_distribution cached_user cached_organization
      classified_listing_category_id
    ],
    methods: %i[
      readable_publish_date cached_tag_list_array flare_tag class_name
      cloudinary_video_url video_duration_in_minutes published_at_int published_timestamp
    ]
  }.freeze

  SIGNED_OUT_RECORD_COUNT = (Rails.env.production? ? 60 : 10).freeze

  before_action :authenticate_user!, except: %i[index search show]
  before_action :set_cache_control_headers, only: %i[index search show]

  rescue_from ArgumentError, with: :bad_request

  def index
    @page = (params[:page] || 1).to_i
    @article_index = true

    return handle_user_or_organization_or_podcast_or_page_index if params[:username]
    return handle_tag_index if params[:tag]

    handle_base_index
  end

  def search
    @query = "...searching"
    @article_index = true
    set_surrogate_key_header "articles-page-with-query"
    render template: "articles/search"
  end

  def show
    @story_show = true
    if (@article = Article.find_by(path: "/#{params[:username].downcase}/#{params[:slug]}")&.decorate)
      handle_article_show
    elsif (@article = Article.find_by(slug: params[:slug])&.decorate)
      handle_possible_redirect
    else
      @podcast = Podcast.available.find_by!(slug: params[:username])
      @episode = PodcastEpisode.available.find_by!(slug: params[:slug])
      handle_podcast_show
    end
  end

  def warm_comments
    @article = Article.find_by(path: "/#{params[:username].downcase}/#{params[:slug]}")&.decorate || not_found
    @warm_only = true
    assign_article_show_variables
    render partial: "articles/full_comment_area"
  end

  private

  def assign_hero_html
    return if SiteConfig.campaign_hero_html_variant_name.blank?

    @hero_area = HtmlVariant.relevant.select(:name, :html).
      find_by(group: "campaign", name: SiteConfig.campaign_hero_html_variant_name)
    @hero_html = @hero_area&.html
  end

  def get_latest_campaign_articles
    campaign_articles_scope = Article.tagged_with(SiteConfig.campaign_featured_tags, any: true).
      where("published_at > ?", 2.weeks.ago).where(approved: true).
      order("hotness_score DESC")

    @campaign_articles_count = campaign_articles_scope.count
    @latest_campaign_articles = campaign_articles_scope.limit(5).pluck(:path, :title, :comments_count, :created_at)
  end

  def redirect_to_changed_username_profile
    potential_username = params[:username].tr("@", "").downcase
    user_or_org = User.find_by("old_username = ? OR old_old_username = ?", potential_username, potential_username) ||
      Organization.find_by("old_slug = ? OR old_old_slug = ?", potential_username, potential_username)
    if user_or_org.present? && !user_or_org.decorate.fully_banished?
      redirect_to user_or_org.path
    else
      not_found
    end
  end

  def handle_possible_redirect
    potential_username = params[:username].tr("@", "").downcase
    @user = User.find_by("old_username = ? OR old_old_username = ?", potential_username, potential_username)
    if @user&.articles&.find_by(slug: params[:slug])
      redirect_to URI.parse("/#{@user.username}/#{params[:slug]}").path
      return
    elsif (@organization = @article.organization)
      redirect_to URI.parse("/#{@organization.slug}/#{params[:slug]}").path
      return
    end
    not_found
  end

  def handle_user_or_organization_or_podcast_or_page_index
    @podcast = Podcast.available.find_by(slug: params[:username].downcase)
    @organization = Organization.find_by(slug: params[:username].downcase)
    @page = Page.find_by(slug: params[:username].downcase, is_top_level_path: true)
    if @podcast
      handle_podcast_index
    elsif @organization
      handle_organization_index
    elsif @page
      handle_page_display
    else
      handle_user_index
    end
  end

  def handle_tag_index
    @tag = params[:tag].downcase
    @page = (params[:page] || 1).to_i
    @tag_model = Tag.find_by(name: @tag) || not_found
    @moderators = User.with_role(:tag_moderator, @tag_model).select(:username, :profile_image, :id)
    if @tag_model.alias_for.present?
      redirect_to "/t/#{@tag_model.alias_for}"
      return
    end

    @num_published_articles = if @tag_model.requires_approval?
                                Article.published.cached_tagged_by_approval_with(@tag).size
                              else
                                Article.published.cached_tagged_with(@tag).where("score > 2").size
                              end
    @number_of_articles = user_signed_in? ? 5 : SIGNED_OUT_RECORD_COUNT
    @stories = Articles::Feed.new(number_of_articles: @number_of_articles, tag: @tag, page: @page).
      published_articles_by_tag

    @stories = @stories.where(approved: true) if @tag_model&.requires_approval

    @stories = stories_by_timeframe
    @stories = @stories.decorate

    set_surrogate_key_header "articles-#{@tag}"
    set_cache_control_headers(600,
                              stale_while_revalidate: 30,
                              stale_if_error: 86_400)
    render template: "articles/tag_index"
  end

  def handle_page_display
    @story_show = true
    set_surrogate_key_header "show-page-#{params[:username]}"
    render template: "pages/show"
  end

  def handle_base_index
    @home_page = true
    assign_feed_stories
    assign_hero_html
    assign_podcasts
    assign_classified_listings
    get_latest_campaign_articles if SiteConfig.campaign_sidebar_enabled?
    @article_index = true
    @featured_story = (featured_story || Article.new)&.decorate
    @stories = ArticleDecorator.decorate_collection(@stories)
    set_surrogate_key_header "main_app_home_page"
    set_cache_control_headers(600,
                              stale_while_revalidate: 30,
                              stale_if_error: 86_400)

    render template: "articles/index"
  end

  def featured_story
    @featured_story ||= Articles::Feed.find_featured_story(@stories)
  end

  def handle_podcast_index
    @podcast_index = true
    @list_of = "podcast-episodes"
    @podcast_episodes = @podcast.podcast_episodes.
      reachable.order("published_at DESC").limit(30).decorate
    set_surrogate_key_header "podcast_episodes"
    render template: "podcast_episodes/index"
  end

  def handle_organization_index
    @user = @organization
    @stories = ArticleDecorator.decorate_collection(@organization.articles.published.
      limited_column_select.
      order("published_at DESC").page(@page).per(8))
    @organization_article_index = true
    set_organization_json_ld
    set_surrogate_key_header "articles-org-#{@organization.id}"
    render template: "organizations/show"
  end

  def handle_user_index
    @user = User.find_by(username: params[:username].tr("@", "").downcase)
    unless @user
      redirect_to_changed_username_profile
      return
    end
    not_found if @user.username.include?("spam_") && @user.decorate.fully_banished?
    assign_user_comments
    assign_user_stories
    @list_of = "articles"
    redirect_if_view_param
    return if performed?

    set_surrogate_key_header "articles-user-#{@user.id}"
    set_user_json_ld
    render template: "users/show"
  end

  def handle_podcast_show
    set_surrogate_key_header @episode.record_key
    @episode = @episode.decorate
    @podcast_episode_show = true
    @comments_to_show_count = 25
    @comment = Comment.new
    render template: "podcast_episodes/show"
    nil
  end

  def redirect_if_view_param
    redirect_to "/internal/users/#{@user.id}" if params[:view] == "moderate"
    redirect_to "/admin/users/#{@user.id}/edit" if params[:view] == "admin"
  end

  def redirect_if_show_view_param
    redirect_to "/internal/articles/#{@article.id}" if params[:view] == "moderate"
  end

  def handle_article_show
    assign_article_show_variables
    set_surrogate_key_header @article.record_key
    redirect_if_show_view_param
    return if performed?

    render template: "articles/show"
  end

  def assign_feed_stories
    feed = Articles::Feed.new(page: @page, tag: params[:tag])
    if params[:timeframe].in?(Timeframer::FILTER_TIMEFRAMES)
      @stories = feed.top_articles_by_timeframe(timeframe: params[:timeframe])
    elsif params[:timeframe] == Timeframer::LATEST_TIMEFRAME
      @stories = feed.latest_feed
    else
      @default_home_feed = true
      @featured_story, @stories = feed.default_home_feed_and_featured_story(user_signed_in: user_signed_in?)
    end
  end

  def assign_article_show_variables
    not_found if permission_denied?
    not_found unless @article.user

    @article_show = true
    @variant_number = params[:variant_version] || (user_signed_in? ? 0 : rand(2))

    @user = @article.user
    @organization = @article.organization

    if @article.collection
      @collection = @article.collection

      # we need to make sure that articles that were cross posted after their
      # original publication date appear in the correct order in the collection,
      # considering non cross posted articles with a more recent publication date
      @collection_articles = @article.collection.articles.
        published.
        order(Arel.sql("COALESCE(crossposted_at, published_at) ASC"))
    end

    @comments_to_show_count = @article.cached_tag_list_array.include?("discuss") ? 50 : 30
    assign_second_and_third_user
    set_article_json_ld
    @comment = Comment.new(body_markdown: @article&.comment_template)
  end

  def permission_denied?
    !@article.published && params[:preview] != @article.password
  end

  def assign_second_and_third_user
    return if @article.second_user_id.blank?

    @second_user = User.find(@article.second_user_id)
    @third_user = User.find(@article.third_user_id) if @article.third_user_id.present?
  end

  def assign_user_comments
    comment_count = params[:view] == "comments" ? 250 : 8
    @comments = if @user.comments_count.positive?
                  @user.comments.where(deleted: false).
                    order("created_at DESC").includes(:commentable).limit(comment_count)
                else
                  []
                end
  end

  def assign_user_stories
    @pinned_stories = Article.published.where(id: @user.profile_pins.select(:pinnable_id)).
      limited_column_select.
      order("published_at DESC").decorate
    @stories = ArticleDecorator.decorate_collection(@user.articles.published.
      limited_column_select.
      where.not(id: @pinned_stories.pluck(:id)).
      order("published_at DESC").page(@page).per(user_signed_in? ? 2 : SIGNED_OUT_RECORD_COUNT))
  end

  def stories_by_timeframe
    if %w[week month year infinity].include?(params[:timeframe])
      @stories.where("published_at > ?", Timeframer.new(params[:timeframe]).datetime).
        order("positive_reactions_count DESC")
    elsif params[:timeframe] == "latest"
      @stories.where("score > ?", -20).order("published_at DESC")
    else
      @stories.order("hotness_score DESC").where("score > 2")
    end
  end

  def assign_podcasts
    return unless user_signed_in?

    num_hours = Rails.env.production? ? 24 : 800
    @podcast_episodes = PodcastEpisode.
      includes(:podcast).
      order("published_at desc").
      where("published_at > ?", num_hours.hours.ago).
      select(:slug, :title, :podcast_id, :image)
  end

  def assign_classified_listings
    @classified_listings = ClassifiedListing.where(published: true).select(:title, :category, :classified_listing_category_id, :slug, :bumped_at)
  end

  def set_user_json_ld
    @user_json_ld = {
      "@context": "http://schema.org",
      "@type": "Person",
      "mainEntityOfPage": {
        "@type": "WebPage",
        "@id": URL.user(@user)
      },
      "url": URL.user(@user),
      "sameAs": [],
      "image": ProfileImage.new(@user).get(width: 320),
      "name": @user.name,
      "email": "",
      "jobTitle": "",
      "description": @user.summary.presence || "404 bio not found",
      "disambiguatingDescription": [],
      "worksFor": [
        {
          "@type": "Organization"
        },
      ],
      "alumniOf": ""
    }
    set_user_profile_json_ld
    set_user_same_as_json_ld
  end

  def set_article_json_ld
    @article_json_ld = {
      "@context": "http://schema.org",
      "@type": "Article",
      "mainEntityOfPage": {
        "@type": "WebPage",
        "@id": URL.article(@article)
      },
      "url": URL.article(@article),
      "image": seo_optimized_images,
      "publisher": {
        "@context": "http://schema.org",
        "@type": "Organization",
        "name": "#{ApplicationConfig['COMMUNITY_NAME']} Community",
        "logo": {
          "@context": "http://schema.org",
          "@type": "ImageObject",
          "url": ApplicationController.helpers.cloudinary(SiteConfig.logo_png, 192, "png"),
          "width": "192",
          "height": "192"
        }
      },
      "headline": @article.title,
      "author": {
        "@context": "http://schema.org",
        "@type": "Person",
        "url": URL.user(@user),
        "name": @user.name
      },
      "datePublished": @article.published_timestamp,
      "dateModified": @article.edited_at&.iso8601 || @article.published_timestamp
    }
  end

  def seo_optimized_images
    # This array of images exists for SEO optimization purposes.
    # For more info on this structure, please refer to this documentation:
    # https://developers.google.com/search/docs/data-types/article
    [ApplicationController.helpers.article_social_image_url(@article, width: 1080, height: 1080),
     ApplicationController.helpers.article_social_image_url(@article, width: 1280, height: 720),
     ApplicationController.helpers.article_social_image_url(@article, width: 1600, height: 900)]
  end

  def set_organization_json_ld
    @organization_json_ld = {
      "@context": "http://schema.org",
      "@type": "Organization",
      "mainEntityOfPage": {
        "@type": "WebPage",
        "@id": URL.organization(@organization)
      },
      "url": URL.organization(@organization),
      "image": ProfileImage.new(@organization).get(width: 320),
      "name": @organization.name,
      "description": @user.summary.presence || "404 bio not found"
    }
  end

  def set_user_profile_json_ld
    @user_json_ld[:disambiguatingDescription].append(@user.mostly_work_with) if @user.mostly_work_with.present?
    @user_json_ld[:disambiguatingDescription].append(@user.currently_hacking_on) if @user.currently_hacking_on.present?
    @user_json_ld[:disambiguatingDescription].append(@user.currently_learning) if @user.currently_learning.present?
    @user_json_ld[:worksFor][0][:name] = @user.employer_name if @user.employer_name.present?
    @user_json_ld[:worksFor][0][:url] = @user.employer_url if @user.employer_url.present?
    @user_json_ld[:alumniOf] = @user.education if @user.education.present?
    @user_json_ld[:email] = @user.email if @user.email_public
    @user_json_ld[:jobTitle] = @user.employment_title if @user.employment_title.present?
    @user_json_ld[:sameAs].append("https://twitter.com/#{@user.twitter_username}") if @user.twitter_username.present?
    @user_json_ld[:sameAs].append("https://github.com/#{@user.github_username}") if @user.github_username.present?
  end

  def set_user_same_as_json_ld
    @user_json_ld[:sameAs].append(@user.mastodon_url) if @user.mastodon_url.present?
    @user_json_ld[:sameAs].append(@user.facebook_url) if @user.facebook_url.present?
    @user_json_ld[:sameAs].append(@user.youtube_url) if @user.youtube_url.present?
    @user_json_ld[:sameAs].append(@user.linkedin_url) if @user.linkedin_url.present?
    @user_json_ld[:sameAs].append(@user.behance_url) if @user.behance_url.present?
    @user_json_ld[:sameAs].append(@user.stackoverflow_url) if @user.stackoverflow_url.present?
    @user_json_ld[:sameAs].append(@user.dribbble_url) if @user.dribbble_url.present?
    @user_json_ld[:sameAs].append(@user.medium_url) if @user.medium_url.present?
    @user_json_ld[:sameAs].append(@user.gitlab_url) if @user.gitlab_url.present?
    @user_json_ld[:sameAs].append(@user.instagram_url) if @user.instagram_url.present?
    @user_json_ld[:sameAs].append(@user.twitch_username) if @user.twitch_username.present?
    @user_json_ld[:sameAs].append(@user.website_url) if @user.website_url.present?
  end
end