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

defmodule Pleroma.Notification do
  use Ecto.Schema

  alias Pleroma.Activity
  alias Pleroma.Notification
  alias Pleroma.Object
  alias Pleroma.Pagination
  alias Pleroma.Repo
  alias Pleroma.User
  alias Pleroma.Web.CommonAPI
  alias Pleroma.Web.CommonAPI.Utils

  import Ecto.Query
  import Ecto.Changeset

  schema "notifications" do
    field(:seen, :boolean, default: false)
    belongs_to(:user, User, type: Pleroma.FlakeId)
    belongs_to(:activity, Activity, type: Pleroma.FlakeId)

    timestamps()
  end

  def changeset(%Notification{} = notification, attrs) do
    notification
    |> cast(attrs, [:seen])
  end

  def for_user_query(user) do
    Notification
    |> where(user_id: ^user.id)
    |> join(:inner, [n], activity in assoc(n, :activity))
    |> join(:left, [n, a], object in Object,
      on:
        fragment(
          "(?->>'id') = COALESCE((? -> 'object'::text) ->> 'id'::text)",
          object.data,
          a.data
        )
    )
    |> preload([n, a, o], activity: {a, object: o})
  end

  def for_user(user, opts \\ %{}) do
    user
    |> for_user_query()
    |> Pagination.fetch_paginated(opts)
  end

  def set_read_up_to(%{id: user_id} = _user, id) do
    query =
      from(
        n in Notification,
        where: n.user_id == ^user_id,
        where: n.id <= ^id,
        update: [
          set: [seen: true]
        ]
      )

    Repo.update_all(query, [])
  end

  def read_one(%User{} = user, notification_id) do
    with {:ok, %Notification{} = notification} <- get(user, notification_id) do
      notification
      |> changeset(%{seen: true})
      |> Repo.update()
    end
  end

  def get(%{id: user_id} = _user, id) do
    query =
      from(
        n in Notification,
        where: n.id == ^id,
        join: activity in assoc(n, :activity),
        preload: [activity: activity]
      )

    notification = Repo.one(query)

    case notification do
      %{user_id: ^user_id} ->
        {:ok, notification}

      _ ->
        {:error, "Cannot get notification"}
    end
  end

  def clear(user) do
    from(n in Notification, where: n.user_id == ^user.id)
    |> Repo.delete_all()
  end

  def dismiss(%{id: user_id} = _user, id) do
    notification = Repo.get(Notification, id)

    case notification do
      %{user_id: ^user_id} ->
        Repo.delete(notification)

      _ ->
        {:error, "Cannot dismiss notification"}
    end
  end

  def create_notifications(%Activity{data: %{"to" => _, "type" => type}} = activity)
      when type in ["Create", "Like", "Announce", "Follow"] do
    users = get_notified_from_activity(activity)

    notifications = Enum.map(users, fn user -> create_notification(activity, user) end)
    {:ok, notifications}
  end

  def create_notifications(_), do: {:ok, []}

  # TODO move to sql, too.
  def create_notification(%Activity{} = activity, %User{} = user) do
    unless User.blocks?(user, %{ap_id: activity.data["actor"]}) or
             CommonAPI.thread_muted?(user, activity) or user.ap_id == activity.data["actor"] or
             (activity.data["type"] == "Follow" and
                Enum.any?(Notification.for_user(user), fn notif ->
                  notif.activity.data["type"] == "Follow" and
                    notif.activity.data["actor"] == activity.data["actor"]
                end)) do
      notification = %Notification{user_id: user.id, activity: activity}
      {:ok, notification} = Repo.insert(notification)
      Pleroma.Web.Streamer.stream("user", notification)
      Pleroma.Web.Push.send(notification)
      notification
    end
  end

  def get_notified_from_activity(activity, local_only \\ true)

  def get_notified_from_activity(
        %Activity{data: %{"to" => _, "type" => type} = _data} = activity,
        local_only
      )
      when type in ["Create", "Like", "Announce", "Follow"] do
    recipients =
      []
      |> Utils.maybe_notify_to_recipients(activity)
      |> Utils.maybe_notify_mentioned_recipients(activity)
      |> Enum.uniq()

    User.get_users_from_set(recipients, local_only)
  end

  def get_notified_from_activity(_, _local_only), do: []
end