defmodule Pleroma.LoadTesting.Fetcher do
  alias Pleroma.Activity
  alias Pleroma.Pagination
  alias Pleroma.Repo
  alias Pleroma.User
  alias Pleroma.Web.ActivityPub.ActivityPub
  alias Pleroma.Web.MastodonAPI.MastodonAPI
  alias Pleroma.Web.MastodonAPI.StatusView

  @spec run_benchmarks(User.t()) :: any()
  def run_benchmarks(user) do
    fetch_user(user)
    fetch_timelines(user)
    render_views(user)
  end

  defp formatters do
    [
      Benchee.Formatters.Console
    ]
  end

  defp fetch_user(user) do
    Benchee.run(
      %{
        "By id" => fn -> Repo.get_by(User, id: user.id) end,
        "By ap_id" => fn -> Repo.get_by(User, ap_id: user.ap_id) end,
        "By email" => fn -> Repo.get_by(User, email: user.email) end,
        "By nickname" => fn -> Repo.get_by(User, nickname: user.nickname) end
      },
      formatters: formatters()
    )
  end

  defp fetch_timelines(user) do
    fetch_home_timeline(user)
    fetch_direct_timeline(user)
    fetch_public_timeline(user)
    fetch_public_timeline(user, :local)
    fetch_public_timeline(user, :tag)
    fetch_notifications(user)
    fetch_favourites(user)
    fetch_long_thread(user)
  end

  defp render_views(user) do
    render_timelines(user)
    render_long_thread(user)
  end

  defp opts_for_home_timeline(user) do
    %{
      "blocking_user" => user,
      "count" => "20",
      "muting_user" => user,
      "type" => ["Create", "Announce"],
      "user" => user,
      "with_muted" => "true"
    }
  end

  defp fetch_home_timeline(user) do
    opts = opts_for_home_timeline(user)

    recipients = [user.ap_id | User.following(user)]

    first_page_last =
      ActivityPub.fetch_activities(recipients, opts) |> Enum.reverse() |> List.last()

    second_page_last =
      ActivityPub.fetch_activities(recipients, Map.put(opts, "max_id", first_page_last.id))
      |> Enum.reverse()
      |> List.last()

    third_page_last =
      ActivityPub.fetch_activities(recipients, Map.put(opts, "max_id", second_page_last.id))
      |> Enum.reverse()
      |> List.last()

    forth_page_last =
      ActivityPub.fetch_activities(recipients, Map.put(opts, "max_id", third_page_last.id))
      |> Enum.reverse()
      |> List.last()

    Benchee.run(
      %{
        "home timeline" => fn opts -> ActivityPub.fetch_activities(recipients, opts) end
      },
      inputs: %{
        "1 page" => opts,
        "2 page" => Map.put(opts, "max_id", first_page_last.id),
        "3 page" => Map.put(opts, "max_id", second_page_last.id),
        "4 page" => Map.put(opts, "max_id", third_page_last.id),
        "5 page" => Map.put(opts, "max_id", forth_page_last.id),
        "1 page only media" => Map.put(opts, "only_media", "true"),
        "2 page only media" =>
          Map.put(opts, "max_id", first_page_last.id) |> Map.put("only_media", "true"),
        "3 page only media" =>
          Map.put(opts, "max_id", second_page_last.id) |> Map.put("only_media", "true"),
        "4 page only media" =>
          Map.put(opts, "max_id", third_page_last.id) |> Map.put("only_media", "true"),
        "5 page only media" =>
          Map.put(opts, "max_id", forth_page_last.id) |> Map.put("only_media", "true")
      },
      formatters: formatters()
    )
  end

  defp opts_for_direct_timeline(user) do
    %{
      :visibility => "direct",
      "blocking_user" => user,
      "count" => "20",
      "type" => "Create",
      "user" => user,
      "with_muted" => "true"
    }
  end

  defp fetch_direct_timeline(user) do
    recipients = [user.ap_id]

    opts = opts_for_direct_timeline(user)

    first_page_last =
      recipients
      |> ActivityPub.fetch_activities_query(opts)
      |> Pagination.fetch_paginated(opts)
      |> List.last()

    opts2 = Map.put(opts, "max_id", first_page_last.id)

    second_page_last =
      recipients
      |> ActivityPub.fetch_activities_query(opts2)
      |> Pagination.fetch_paginated(opts2)
      |> List.last()

    opts3 = Map.put(opts, "max_id", second_page_last.id)

    third_page_last =
      recipients
      |> ActivityPub.fetch_activities_query(opts3)
      |> Pagination.fetch_paginated(opts3)
      |> List.last()

    opts4 = Map.put(opts, "max_id", third_page_last.id)

    forth_page_last =
      recipients
      |> ActivityPub.fetch_activities_query(opts4)
      |> Pagination.fetch_paginated(opts4)
      |> List.last()

    Benchee.run(
      %{
        "direct timeline" => fn opts ->
          ActivityPub.fetch_activities_query(recipients, opts) |> Pagination.fetch_paginated(opts)
        end
      },
      inputs: %{
        "1 page" => opts,
        "2 page" => opts2,
        "3 page" => opts3,
        "4 page" => opts4,
        "5 page" => Map.put(opts4, "max_id", forth_page_last.id)
      },
      formatters: formatters()
    )
  end

  defp opts_for_public_timeline(user) do
    %{
      "type" => ["Create", "Announce"],
      "local_only" => false,
      "blocking_user" => user,
      "muting_user" => user
    }
  end

  defp opts_for_public_timeline(user, :local) do
    %{
      "type" => ["Create", "Announce"],
      "local_only" => true,
      "blocking_user" => user,
      "muting_user" => user
    }
  end

  defp opts_for_public_timeline(user, :tag) do
    %{
      "blocking_user" => user,
      "count" => "20",
      "local_only" => nil,
      "muting_user" => user,
      "tag" => ["tag"],
      "tag_all" => [],
      "tag_reject" => [],
      "type" => "Create",
      "user" => user,
      "with_muted" => "true"
    }
  end

  defp fetch_public_timeline(user) do
    opts = opts_for_public_timeline(user)

    fetch_public_timeline(opts, "public timeline")
  end

  defp fetch_public_timeline(user, :local) do
    opts = opts_for_public_timeline(user, :local)

    fetch_public_timeline(opts, "public timeline only local")
  end

  defp fetch_public_timeline(user, :tag) do
    opts = opts_for_public_timeline(user, :tag)

    fetch_public_timeline(opts, "hashtag timeline")
  end

  defp fetch_public_timeline(user, :only_media) do
    opts = opts_for_public_timeline(user) |> Map.put("only_media", "true")

    fetch_public_timeline(opts, "public timeline only media")
  end

  defp fetch_public_timeline(opts, title) when is_binary(title) do
    first_page_last = ActivityPub.fetch_public_activities(opts) |> List.last()

    second_page_last =
      ActivityPub.fetch_public_activities(Map.put(opts, "max_id", first_page_last.id))
      |> List.last()

    third_page_last =
      ActivityPub.fetch_public_activities(Map.put(opts, "max_id", second_page_last.id))
      |> List.last()

    forth_page_last =
      ActivityPub.fetch_public_activities(Map.put(opts, "max_id", third_page_last.id))
      |> List.last()

    Benchee.run(
      %{
        title => fn opts ->
          ActivityPub.fetch_public_activities(opts)
        end
      },
      inputs: %{
        "1 page" => opts,
        "2 page" => Map.put(opts, "max_id", first_page_last.id),
        "3 page" => Map.put(opts, "max_id", second_page_last.id),
        "4 page" => Map.put(opts, "max_id", third_page_last.id),
        "5 page" => Map.put(opts, "max_id", forth_page_last.id)
      },
      formatters: formatters()
    )
  end

  defp opts_for_notifications do
    %{"count" => "20", "with_muted" => "true"}
  end

  defp fetch_notifications(user) do
    opts = opts_for_notifications()

    first_page_last = MastodonAPI.get_notifications(user, opts) |> List.last()

    second_page_last =
      MastodonAPI.get_notifications(user, Map.put(opts, "max_id", first_page_last.id))
      |> List.last()

    third_page_last =
      MastodonAPI.get_notifications(user, Map.put(opts, "max_id", second_page_last.id))
      |> List.last()

    forth_page_last =
      MastodonAPI.get_notifications(user, Map.put(opts, "max_id", third_page_last.id))
      |> List.last()

    Benchee.run(
      %{
        "Notifications" => fn opts ->
          MastodonAPI.get_notifications(user, opts)
        end
      },
      inputs: %{
        "1 page" => opts,
        "2 page" => Map.put(opts, "max_id", first_page_last.id),
        "3 page" => Map.put(opts, "max_id", second_page_last.id),
        "4 page" => Map.put(opts, "max_id", third_page_last.id),
        "5 page" => Map.put(opts, "max_id", forth_page_last.id)
      },
      formatters: formatters()
    )
  end

  defp fetch_favourites(user) do
    first_page_last = ActivityPub.fetch_favourites(user) |> List.last()

    second_page_last =
      ActivityPub.fetch_favourites(user, %{"max_id" => first_page_last.id}) |> List.last()

    third_page_last =
      ActivityPub.fetch_favourites(user, %{"max_id" => second_page_last.id}) |> List.last()

    forth_page_last =
      ActivityPub.fetch_favourites(user, %{"max_id" => third_page_last.id}) |> List.last()

    Benchee.run(
      %{
        "Favourites" => fn opts ->
          ActivityPub.fetch_favourites(user, opts)
        end
      },
      inputs: %{
        "1 page" => %{},
        "2 page" => %{"max_id" => first_page_last.id},
        "3 page" => %{"max_id" => second_page_last.id},
        "4 page" => %{"max_id" => third_page_last.id},
        "5 page" => %{"max_id" => forth_page_last.id}
      },
      formatters: formatters()
    )
  end

  defp opts_for_long_thread(user) do
    %{
      "blocking_user" => user,
      "user" => user
    }
  end

  defp fetch_long_thread(user) do
    %{public_thread: public, private_thread: private} =
      Agent.get(:benchmark_state, fn state -> state end)

    opts = opts_for_long_thread(user)

    private_input = {private.data["context"], Map.put(opts, "exclude_id", private.id)}

    public_input = {public.data["context"], Map.put(opts, "exclude_id", public.id)}

    Benchee.run(
      %{
        "fetch context" => fn {context, opts} ->
          ActivityPub.fetch_activities_for_context(context, opts)
        end
      },
      inputs: %{
        "Private long thread" => private_input,
        "Public long thread" => public_input
      },
      formatters: formatters()
    )
  end

  defp render_timelines(user) do
    opts = opts_for_home_timeline(user)

    recipients = [user.ap_id | User.following(user)]

    home_activities = ActivityPub.fetch_activities(recipients, opts) |> Enum.reverse()

    recipients = [user.ap_id]

    opts = opts_for_direct_timeline(user)

    direct_activities =
      recipients
      |> ActivityPub.fetch_activities_query(opts)
      |> Pagination.fetch_paginated(opts)

    opts = opts_for_public_timeline(user)

    public_activities = ActivityPub.fetch_public_activities(opts)

    opts = opts_for_public_timeline(user, :tag)

    tag_activities = ActivityPub.fetch_public_activities(opts)

    opts = opts_for_notifications()

    notifications = MastodonAPI.get_notifications(user, opts)

    favourites = ActivityPub.fetch_favourites(user)

    Benchee.run(
      %{
        "Rendering home timeline" => fn ->
          StatusView.render("index.json", %{
            activities: home_activities,
            for: user,
            as: :activity
          })
        end,
        "Rendering direct timeline" => fn ->
          StatusView.render("index.json", %{
            activities: direct_activities,
            for: user,
            as: :activity
          })
        end,
        "Rendering public timeline" => fn ->
          StatusView.render("index.json", %{
            activities: public_activities,
            for: user,
            as: :activity
          })
        end,
        "Rendering tag timeline" => fn ->
          StatusView.render("index.json", %{
            activities: tag_activities,
            for: user,
            as: :activity
          })
        end,
        "Rendering notifications" => fn ->
          Pleroma.Web.MastodonAPI.NotificationView.render("index.json", %{
            notifications: notifications,
            for: user
          })
        end,
        "Rendering favourites timeline" => fn ->
          StatusView.render("index.json", %{
            activities: favourites,
            for: user,
            as: :activity
          })
        end
      },
      formatters: formatters()
    )
  end

  defp render_long_thread(user) do
    %{public_thread: public, private_thread: private} =
      Agent.get(:benchmark_state, fn state -> state end)

    opts = %{for: user}
    public_activity = Activity.get_by_id_with_object(public.id)
    private_activity = Activity.get_by_id_with_object(private.id)

    Benchee.run(
      %{
        "render" => fn opts ->
          StatusView.render("show.json", opts)
        end
      },
      inputs: %{
        "Public root" => Map.put(opts, :activity, public_activity),
        "Private root" => Map.put(opts, :activity, private_activity)
      },
      formatters: formatters()
    )

    fetch_opts = opts_for_long_thread(user)

    public_context =
      ActivityPub.fetch_activities_for_context(
        public.data["context"],
        Map.put(fetch_opts, "exclude_id", public.id)
      )

    private_context =
      ActivityPub.fetch_activities_for_context(
        private.data["context"],
        Map.put(fetch_opts, "exclude_id", private.id)
      )

    Benchee.run(
      %{
        "render" => fn opts ->
          StatusView.render("context.json", opts)
        end
      },
      inputs: %{
        "Public context" => %{user: user, activity: public_activity, activities: public_context},
        "Private context" => %{
          user: user,
          activity: private_activity,
          activities: private_context
        }
      },
      formatters: formatters()
    )
  end
end