defmodule Pleroma.Web.MastodonAPI.StatusView do
  use Pleroma.Web, :view
  alias Pleroma.Web.MastodonAPI.{AccountView, StatusView}
  alias Pleroma.{User, Activity}
  alias Pleroma.Web.CommonAPI.Utils
  alias Pleroma.Web.MediaProxy

  def render("index.json", opts) do
    render_many(opts.activities, StatusView, "status.json", opts)
  end

  def render("status.json", %{activity: %{data: %{"type" => "Announce", "object" => object}} = activity} = opts) do
    user = User.get_cached_by_ap_id(activity.data["actor"])
    created_at = Utils.to_masto_date(activity.data["published"])

    reblogged = Activity.get_create_activity_by_object_ap_id(object)
    reblogged = render("status.json", Map.put(opts, :activity, reblogged))

    mentions = activity.recipients
    |> Enum.map(fn (ap_id) -> User.get_cached_by_ap_id(ap_id) end)
    |> Enum.filter(&(&1))
    |> Enum.map(fn (user) -> AccountView.render("mention.json", %{user: user}) end)

    %{
      id: to_string(activity.id),
      uri: object,
      url: nil, # TODO: This might be wrong, check with mastodon.
      account: AccountView.render("account.json", %{user: user}),
      in_reply_to_id: nil,
      in_reply_to_account_id: nil,
      reblog: reblogged,
      content: reblogged[:content],
      created_at: created_at,
      reblogs_count: 0,
      favourites_count: 0,
      reblogged: false,
      favourited: false,
      muted: false,
      sensitive: false,
      spoiler_text: "",
      visibility: "public",
      media_attachments: [],
      mentions: mentions,
      tags: [],
      application: %{
        name: "Web",
        website: nil
      },
      language: nil,
      emojis: []
    }
  end

  def render("status.json", %{activity: %{data: %{"object" => object}} = activity} = opts) do
    user = User.get_cached_by_ap_id(activity.data["actor"])

    like_count = object["like_count"] || 0
    announcement_count = object["announcement_count"] || 0

    tags = object["tag"] || []
    sensitive = object["sensitive"] || Enum.member?(tags, "nsfw")

    mentions = activity.recipients
    |> Enum.map(fn (ap_id) -> User.get_cached_by_ap_id(ap_id) end)
    |> Enum.filter(&(&1))
    |> Enum.map(fn (user) -> AccountView.render("mention.json", %{user: user}) end)

    repeated = opts[:for] && opts[:for].ap_id in (object["announcements"] || [])
    favorited = opts[:for] && opts[:for].ap_id in (object["likes"] || [])

    attachments = render_many(object["attachment"] || [], StatusView, "attachment.json", as: :attachment)

    created_at = Utils.to_masto_date(object["published"])

    # TODO: Add cached version.
    reply_to = if object["inReplyTo"] && object["inReplyTo"] != "" do
      Activity.get_create_activity_by_object_ap_id(object["inReplyTo"])
    else
      nil
    end
    reply_to_user = reply_to && User.get_cached_by_ap_id(reply_to.data["actor"])

    emojis = (activity.data["object"]["emoji"] || [])
    |> Enum.map(fn {name, url} ->
      name = HtmlSanitizeEx.strip_tags(name)
      url = HtmlSanitizeEx.strip_tags(url)
      %{ shortcode: name, url: url, static_url: url }
    end)

    %{
      id: to_string(activity.id),
      uri: object["id"],
      url: object["external_url"] || object["id"],
      account: AccountView.render("account.json", %{user: user}),
      in_reply_to_id: reply_to && reply_to.id,
      in_reply_to_account_id: reply_to_user && reply_to_user.id,
      reblog: nil,
      content: HtmlSanitizeEx.basic_html(object["content"]),
      created_at: created_at,
      reblogs_count: announcement_count,
      favourites_count: like_count,
      reblogged: !!repeated,
      favourited: !!favorited,
      muted: false,
      sensitive: sensitive,
      spoiler_text: object["summary"] || "",
      visibility: get_visibility(object),
      media_attachments: attachments |> Enum.take(4),
      mentions: mentions,
      tags: [], # fix,
      application: %{
        name: "Web",
        website: nil
      },
      language: nil,
      emojis: emojis
    }
  end

  def get_visibility(object) do
    public = "https://www.w3.org/ns/activitystreams#Public"
    to = object["to"] || []
    cc = object["cc"] || []
    cond do
      public in to -> "public"
      public in cc -> "unlisted"
      Enum.any?(to, &(String.contains?(&1, "/followers"))) -> "private"
      true -> "direct"
    end
  end

  def render("attachment.json", %{attachment: attachment}) do
    [%{"mediaType" => media_type, "href" => href} | _] = attachment["url"]

    type = cond do
      String.contains?(media_type, "image") -> "image"
      String.contains?(media_type, "video") -> "video"
      String.contains?(media_type, "audio") -> "audio"
      true -> "unknown"
    end

    << hash_id::signed-32, _rest::binary >> = :crypto.hash(:md5, href)

    %{
      id: to_string(attachment["id"] || hash_id),
      url: MediaProxy.url(href),
      remote_url: href,
      preview_url: MediaProxy.url(href),
      text_url: href,
      type: type
    }
  end
end