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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Feed.FeedView do
+  use Phoenix.HTML
+  use Pleroma.Web, :view
+
+  alias Pleroma.Object
+  alias Pleroma.User
+  alias Pleroma.Web.Gettext
+  alias Pleroma.Web.MediaProxy
+
+  require Pleroma.Constants
+
+  @days ~w(Mon Tue Wed Thu Fri Sat Sun)
+  @months ~w(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec)
+
+  def prepare_activity(activity, opts \\ []) do
+    object = Object.normalize(activity, fetch: false)
+
+    actor =
+      if opts[:actor] do
+        Pleroma.User.get_cached_by_ap_id(activity.actor)
+      end
+
+    %{
+      activity: activity,
+      object: object,
+      data: Map.get(object, :data),
+      actor: actor
+    }
+  end
+
+  def most_recent_update(activities) do
+    with %{updated_at: updated_at} <- List.first(activities) do
+      to_rfc3339(updated_at)
+    end
+  end
+
+  def most_recent_update(activities, user, :atom) do
+    (List.first(activities) || user).updated_at
+    |> to_rfc3339()
+  end
+
+  def most_recent_update(activities, user, :rss) do
+    (List.first(activities) || user).updated_at
+    |> to_rfc2822()
+  end
+
+  def feed_logo do
+    case Pleroma.Config.get([:feed, :logo]) do
+      nil ->
+        "#{Pleroma.Web.Endpoint.url()}/static/logo.svg"
+
+      logo ->
+        "#{Pleroma.Web.Endpoint.url()}#{logo}"
+    end
+    |> MediaProxy.url()
+  end
+
+  def email(user) do
+    user.nickname <> "@" <> Pleroma.Web.Endpoint.host()
+  end
+
+  def logo(user) do
+    user
+    |> User.avatar_url()
+    |> MediaProxy.url()
+  end
+
+  def last_activity(activities), do: List.last(activities)
+
+  def activity_title(%{"content" => content} = data, opts \\ %{}) do
+    summary = Map.get(data, "summary", "")
+
+    title =
+      cond do
+        summary != "" -> summary
+        content != "" -> activity_content(data)
+        true -> "a post"
+      end
+
+    title
+    |> Pleroma.Web.Metadata.Utils.scrub_html_and_truncate(opts[:max_length], opts[:omission])
+    |> HtmlEntities.encode()
+  end
+
+  def activity_description(data) do
+    content = activity_content(data)
+    summary = data["summary"]
+
+    cond do
+      content != "" -> escape(content)
+      summary != "" -> escape(summary)
+      true -> escape(data["type"])
+    end
+  end
+
+  def activity_content(%{"content" => content}) do
+    content
+    |> String.replace(~r/[\n\r]/, "")
+  end
+
+  def activity_content(_), do: ""
+
+  def activity_context(activity), do: escape(activity.data["context"])
+
+  def attachment_href(attachment) do
+    attachment["url"]
+    |> hd()
+    |> Map.get("href")
+  end
+
+  def attachment_type(attachment) do
+    attachment["url"]
+    |> hd()
+    |> Map.get("mediaType")
+  end
+
+  def get_href(id) do
+    with %Object{data: %{"external_url" => external_url}} <- Object.get_cached_by_ap_id(id) do
+      external_url
+    else
+      _e -> id
+    end
+  end
+
+  def escape(html) do
+    html
+    |> html_escape()
+    |> safe_to_string()
+  end
+
+  @spec to_rfc3339(String.t() | NativeDateTime.t()) :: String.t()
+  def to_rfc3339(date) when is_binary(date) do
+    date
+    |> Timex.parse!("{ISO:Extended}")
+    |> to_rfc3339()
+  end
+
+  def to_rfc3339(nd) do
+    nd
+    |> Timex.to_datetime()
+    |> Timex.format!("{RFC3339}")
+  end
+
+  @spec to_rfc2822(String.t() | DateTime.t() | NativeDateTime.t()) :: String.t()
+  def to_rfc2822(datestr) when is_binary(datestr) do
+    datestr
+    |> Timex.parse!("{ISO:Extended}")
+    |> to_rfc2822()
+  end
+
+  def to_rfc2822(%DateTime{} = date) do
+    date
+    |> DateTime.to_naive()
+    |> NaiveDateTime.to_erl()
+    |> rfc2822_from_erl()
+  end
+
+  def to_rfc2822(nd) do
+    nd
+    |> Timex.to_datetime()
+    |> DateTime.to_naive()
+    |> NaiveDateTime.to_erl()
+    |> rfc2822_from_erl()
+  end
+
+  @doc """
+  Builds a RFC2822 timestamp from an Erlang timestamp
+  [RFC2822 3.3 - Date and Time Specification](https://tools.ietf.org/html/rfc2822#section-3.3)
+  This function always assumes the Erlang timestamp is in Universal time, not Local time
+  """
+  def rfc2822_from_erl({{year, month, day} = date, {hour, minute, second}}) do
+    day_name = Enum.at(@days, :calendar.day_of_the_week(date) - 1)
+    month_name = Enum.at(@months, month - 1)
+
+    date_part = "#{day_name}, #{day} #{month_name} #{year}"
+    time_part = "#{pad(hour)}:#{pad(minute)}:#{pad(second)}"
+
+    date_part <> " " <> time_part <> " +0000"
+  end
+
+  defp pad(num) do
+    num
+    |> Integer.to_string()
+    |> String.pad_leading(2, "0")
+  end
+end