# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only

defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
  use Pleroma.Web, :controller

  import Pleroma.Web.ControllerHelper, only: [add_link_headers: 2]

  alias Pleroma.Bookmark
  alias Pleroma.Pagination
  alias Pleroma.User
  alias Pleroma.Web.ActivityPub.ActivityPub
  alias Pleroma.Web.CommonAPI
  alias Pleroma.Web.MastodonAPI.AccountView
  alias Pleroma.Web.MastodonAPI.StatusView

  require Logger

  action_fallback(Pleroma.Web.MastodonAPI.FallbackController)

  def follows(%{assigns: %{user: follower}} = conn, %{"uri" => uri}) do
    with {_, %User{} = followed} <- {:followed, User.get_cached_by_nickname(uri)},
         {_, true} <- {:followed, follower.id != followed.id},
         {:ok, follower, followed, _} <- CommonAPI.follow(follower, followed) do
      conn
      |> put_view(AccountView)
      |> render("show.json", %{user: followed, for: follower})
    else
      {:followed, _} ->
        {:error, :not_found}

      {:error, message} ->
        conn
        |> put_status(:forbidden)
        |> json(%{error: message})
    end
  end

  def mutes(%{assigns: %{user: user}} = conn, _) do
    with muted_accounts <- User.muted_users(user) do
      res = AccountView.render("index.json", users: muted_accounts, for: user, as: :user)
      json(conn, res)
    end
  end

  def blocks(%{assigns: %{user: user}} = conn, _) do
    with blocked_accounts <- User.blocked_users(user) do
      res = AccountView.render("index.json", users: blocked_accounts, for: user, as: :user)
      json(conn, res)
    end
  end

  def favourites(%{assigns: %{user: user}} = conn, params) do
    params =
      params
      |> Map.put("type", "Create")
      |> Map.put("favorited_by", user.ap_id)
      |> Map.put("blocking_user", user)

    activities =
      ActivityPub.fetch_activities([], params)
      |> Enum.reverse()

    conn
    |> add_link_headers(activities)
    |> put_view(StatusView)
    |> render("index.json", %{activities: activities, for: user, as: :activity})
  end

  def bookmarks(%{assigns: %{user: user}} = conn, params) do
    user = User.get_cached_by_id(user.id)

    bookmarks =
      Bookmark.for_user_query(user.id)
      |> Pagination.fetch_paginated(params)

    activities =
      bookmarks
      |> Enum.map(fn b -> Map.put(b.activity, :bookmark, Map.delete(b, :activity)) end)

    conn
    |> add_link_headers(bookmarks)
    |> put_view(StatusView)
    |> render("index.json", %{activities: activities, for: user, as: :activity})
  end

  # Stubs for unimplemented mastodon api
  #
  def empty_array(conn, _) do
    Logger.debug("Unimplemented, returning an empty array")
    json(conn, [])
  end

  def empty_object(conn, _) do
    Logger.debug("Unimplemented, returning an empty object")
    json(conn, %{})
  end
end