defmodule TribeOne.TribesPlugin.Supertest.API do
  @moduledoc false

  @scheduler_control_name "scheduler:control"
  @scheduler_singleton_name "scheduler:singleton"
  @scheduler_all_nodes_prefix "scheduler:all_nodes:"

  def health do
    {:ok,
     %{
       ok: true,
       plugin: "tribe-one-supertest",
       version: manifest_version()
     }}
  end

  def schema do
    {:ok,
     %{
       ok: true,
       schema: %{
         version: 1,
         capabilities: %{
           cluster_pubsub_probe: true,
           scheduler_probe: true
         },
         tables: %{
           cases: table_present?("supertest_cases"),
           events: table_present?("supertest_events")
         }
       }
     }}
  end

  def reset(%{"run_id" => run_id}) when is_binary(run_id) and run_id != "" do
    with {:ok, events} <-
           TribeOne.TribesPlugin.Supertest.list_events_by_run(run_id, authorize?: false),
         :ok <-
           destroy_all(
             events,
             &TribeOne.TribesPlugin.Supertest.destroy_event(&1, authorize?: false)
           ),
         {:ok, cases} <-
           TribeOne.TribesPlugin.Supertest.list_cases_by_run(run_id, authorize?: false),
         :ok <-
           destroy_all(
             cases,
             &TribeOne.TribesPlugin.Supertest.destroy_case(&1, authorize?: false)
           ) do
      {:ok, %{ok: true, deleted: %{cases: length(cases), events: length(events)}}}
    end
  end

  def reset(_params), do: {:error, :invalid_run_id}

  def create_case(params) do
    attrs = %{
      run_id: required_string!(params, "run_id"),
      name: required_string!(params, "name"),
      counter: integer_param(params, "counter", 0),
      status: atom_param(params, "status", :new),
      payload: map_param(params, "payload")
    }

    with {:ok, test_case} <- TribeOne.TribesPlugin.Supertest.create_case(attrs, authorize?: false) do
      {:ok, %{ok: true, case: case_json(test_case)}}
    end
  rescue
    error in ArgumentError -> {:error, error.message}
  end

  def create_event(params) do
    attrs = %{
      case_id: required_string!(params, "case_id"),
      run_id: required_string!(params, "run_id"),
      sequence: integer_param(params, "sequence", nil),
      body: required_string!(params, "body"),
      payload: map_param(params, "payload")
    }

    with {:ok, event} <- TribeOne.TribesPlugin.Supertest.create_event(attrs, authorize?: false) do
      {:ok, %{ok: true, event: event_json(event)}}
    end
  rescue
    error in ArgumentError -> {:error, error.message}
  end

  def increment_case(%{"id" => id} = params) when is_binary(id) and id != "" do
    delta = integer_param(params, "delta", 1)

    with {:ok, test_case} <- TribeOne.TribesPlugin.Supertest.get_case(id, authorize?: false),
         {:ok, updated} <-
           TribeOne.TribesPlugin.Supertest.update_case(
             test_case,
             %{counter: test_case.counter + delta},
             authorize?: false
           ) do
      {:ok, %{ok: true, case: case_json(updated)}}
    end
  end

  def increment_case(_params), do: {:error, :invalid_case_id}

  def state(%{"run_id" => run_id}) when is_binary(run_id) and run_id != "" do
    with {:ok, cases} <-
           TribeOne.TribesPlugin.Supertest.list_cases_by_run(run_id, authorize?: false),
         {:ok, events} <-
           TribeOne.TribesPlugin.Supertest.list_events_by_run(run_id, authorize?: false) do
      {:ok,
       %{
         ok: true,
         run_id: run_id,
         cases: Enum.map(cases, &case_json/1),
         events: Enum.map(events, &event_json/1)
       }}
    end
  end

  def state(_params), do: {:error, :invalid_run_id}

  def broadcast_cluster_pubsub(params) do
    run_id = required_string!(params, "run_id")
    payload = map_param(params, "payload")

    with {:ok, message} <-
           TribeOne.TribesPlugin.Supertest.ClusterPubSubProbe.broadcast(run_id, payload) do
      {:ok, %{ok: true, message: cluster_pubsub_message_json(message)}}
    end
  rescue
    error in ArgumentError -> {:error, error.message}
  end

  def reset_cluster_pubsub(%{"run_id" => run_id}) when is_binary(run_id) and run_id != "" do
    with :ok <- TribeOne.TribesPlugin.Supertest.ClusterPubSubProbe.reset(run_id) do
      {:ok, %{ok: true}}
    end
  end

  def reset_cluster_pubsub(_params), do: {:error, :invalid_run_id}

  def received_cluster_pubsub(%{"run_id" => run_id}) when is_binary(run_id) and run_id != "" do
    with {:ok, messages} <- TribeOne.TribesPlugin.Supertest.ClusterPubSubProbe.received(run_id) do
      {:ok,
       %{ok: true, run_id: run_id, messages: Enum.map(messages, &cluster_pubsub_message_json/1)}}
    end
  end

  def received_cluster_pubsub(_params), do: {:error, :invalid_run_id}

  def emit_metrics_probe(params) do
    value = integer_param(params, "value", nil)

    :telemetry.execute([:supertest, :metrics, :probe], %{value: value}, %{})

    {:ok, %{ok: true, value: value}}
  rescue
    error in ArgumentError -> {:error, error.message}
  end

  def start_scheduler_probe(params) do
    run_id = required_string!(params, "run_id")
    expected_nodes = integer_param(params, "expected_nodes", 1)

    with {:ok, control} <-
           upsert_scheduler_case(run_id, @scheduler_control_name, %{
             counter: expected_nodes,
             status: :active,
             payload: %{"expected_nodes" => expected_nodes}
           }) do
      {:ok, %{ok: true, run_id: run_id, control: case_json(control)}}
    end
  rescue
    error in ArgumentError -> {:error, error.message}
  end

  def scheduler_probe(%{"run_id" => run_id}) when is_binary(run_id) and run_id != "" do
    with {:ok, cases} <-
           TribeOne.TribesPlugin.Supertest.list_cases_by_run(run_id, authorize?: false) do
      {:ok, scheduler_probe_summary(run_id, cases)}
    end
  end

  def scheduler_probe(_params), do: {:error, :invalid_run_id}

  def stop_scheduler_probe(%{"run_id" => run_id}) when is_binary(run_id) and run_id != "" do
    with {:ok, cases} <-
           TribeOne.TribesPlugin.Supertest.list_cases_by_run(run_id, authorize?: false) do
      case Enum.find(cases, &(&1.name == @scheduler_control_name)) do
        nil ->
          {:ok, %{ok: true, run_id: run_id, stopped: false}}

        control ->
          with {:ok, stopped} <-
                 TribeOne.TribesPlugin.Supertest.update_case(
                   control,
                   %{status: :done},
                   authorize?: false
                 ) do
            {:ok, %{ok: true, run_id: run_id, stopped: true, control: case_json(stopped)}}
          end
      end
    end
  end

  def stop_scheduler_probe(_params), do: {:error, :invalid_run_id}

  def record_scheduler_execution(kind, %Tribes.Plugin.Scheduler.Job{} = job)
      when kind in [:singleton, :all_nodes] do
    with {:ok, probes} <- active_scheduler_probes() do
      Enum.reduce_while(probes, :ok, fn probe, :ok ->
        case record_scheduler_execution(probe, kind, job) do
          {:ok, _case} -> {:cont, :ok}
          {:error, reason} -> {:halt, {:error, reason}}
        end
      end)
    end
  end

  def management_echo(context, params) do
    {:ok,
     %{
       ok: true,
       plugin: context.plugin,
       method: context.method,
       version: context.version,
       admin: context.admin?,
       actor_pubkey: context.actor_pubkey,
       params: params
     }}
  end

  defp active_scheduler_probes do
    with {:ok, cases} <- TribeOne.TribesPlugin.Supertest.list_cases(authorize?: false) do
      {:ok,
       Enum.filter(cases, fn test_case ->
         test_case.name == @scheduler_control_name and test_case.status == :active
       end)}
    end
  end

  defp record_scheduler_execution(probe, kind, job) do
    run_id = probe.run_id
    name = scheduler_result_name(kind, job.node_id)
    payload = scheduler_result_payload(kind, job)

    with {:ok, cases} <-
           TribeOne.TribesPlugin.Supertest.list_cases_by_run(run_id, authorize?: false) do
      case Enum.find(cases, &(&1.name == name)) do
        nil ->
          create_scheduler_result_case(run_id, name, payload)

        existing ->
          TribeOne.TribesPlugin.Supertest.update_case(
            existing,
            %{
              counter: existing.counter + 1,
              status: :active,
              payload: payload
            },
            authorize?: false
          )
      end
    end
  end

  defp create_scheduler_result_case(run_id, name, payload) do
    TribeOne.TribesPlugin.Supertest.create_case(
      %{
        run_id: run_id,
        name: name,
        counter: 1,
        status: :active,
        payload: payload
      },
      authorize?: false
    )
  end

  defp upsert_scheduler_case(run_id, name, attrs) do
    with {:ok, cases} <-
           TribeOne.TribesPlugin.Supertest.list_cases_by_run(run_id, authorize?: false) do
      case Enum.find(cases, &(&1.name == name)) do
        nil ->
          TribeOne.TribesPlugin.Supertest.create_case(
            Map.merge(%{run_id: run_id, name: name}, attrs),
            authorize?: false
          )

        existing ->
          TribeOne.TribesPlugin.Supertest.update_case(existing, attrs, authorize?: false)
      end
    end
  end

  defp scheduler_probe_summary(run_id, cases) do
    control = Enum.find(cases, &(&1.name == @scheduler_control_name))
    singleton = Enum.find(cases, &(&1.name == @scheduler_singleton_name))
    all_nodes = Enum.filter(cases, &String.starts_with?(&1.name, @scheduler_all_nodes_prefix))
    expected_nodes = expected_scheduler_nodes(control)
    all_node_ids = all_nodes |> Enum.map(&scheduler_node_id/1) |> Enum.uniq() |> Enum.sort()
    singleton_counter = counter(singleton)

    all_nodes_counter =
      Enum.reduce(all_nodes, 0, fn test_case, acc -> acc + test_case.counter end)

    %{
      ok: true,
      run_id: run_id,
      active: control && control.status == :active,
      expected_nodes: expected_nodes,
      passed?: singleton_counter >= 1 and length(all_node_ids) >= expected_nodes,
      singleton: %{
        counter: singleton_counter,
        node_ids: scheduler_case_node_ids([singleton]),
        case: maybe_case_json(singleton)
      },
      all_nodes: %{
        counter: all_nodes_counter,
        node_ids: all_node_ids,
        cases: Enum.map(all_nodes, &case_json/1)
      }
    }
  end

  defp scheduler_result_name(:singleton, _node_id), do: @scheduler_singleton_name
  defp scheduler_result_name(:all_nodes, node_id), do: @scheduler_all_nodes_prefix <> node_id

  defp scheduler_result_payload(kind, job) do
    %{
      "kind" => Atom.to_string(kind),
      "job_id" => job.id,
      "cron_id" => job.cron_id,
      "attempt_id" => job.attempt_id,
      "attempt_token" => job.attempt_token,
      "node_id" => job.node_id,
      "scheduled_at" => datetime_json(job.scheduled_at)
    }
  end

  defp expected_scheduler_nodes(nil), do: 1

  defp expected_scheduler_nodes(control) do
    case control.payload do
      %{"expected_nodes" => expected_nodes}
      when is_integer(expected_nodes) and expected_nodes > 0 ->
        expected_nodes

      _other ->
        1
    end
  end

  defp counter(nil), do: 0
  defp counter(test_case), do: test_case.counter

  defp scheduler_case_node_ids(cases) do
    cases
    |> Enum.reject(&is_nil/1)
    |> Enum.map(&scheduler_node_id/1)
    |> Enum.reject(&is_nil/1)
    |> Enum.uniq()
    |> Enum.sort()
  end

  defp scheduler_node_id(test_case) do
    case test_case.payload do
      %{"node_id" => node_id} when is_binary(node_id) and node_id != "" ->
        node_id

      _other ->
        String.trim_leading(test_case.name, @scheduler_all_nodes_prefix)
    end
  end

  defp maybe_case_json(nil), do: nil
  defp maybe_case_json(test_case), do: case_json(test_case)

  defp destroy_all(entries, fun) do
    Enum.reduce_while(entries, :ok, fn entry, :ok ->
      case fun.(entry) do
        :ok -> {:cont, :ok}
        {:ok, _record} -> {:cont, :ok}
        {:error, reason} -> {:halt, {:error, reason}}
      end
    end)
  end

  defp table_present?(table) do
    query = "SELECT to_regclass($1)::text"

    case Ecto.Adapters.SQL.query(Tribes.Repo, query, ["public.#{table}"]) do
      {:ok, %{rows: [[name]]}} when is_binary(name) -> true
      _ -> false
    end
  end

  defp case_json(test_case) do
    %{
      id: test_case.id,
      run_id: test_case.run_id,
      name: test_case.name,
      counter: test_case.counter,
      status: to_string(test_case.status),
      payload: test_case.payload,
      inserted_at: datetime_json(test_case.inserted_at),
      updated_at: datetime_json(test_case.updated_at)
    }
  end

  defp event_json(event) do
    %{
      id: event.id,
      case_id: event.case_id,
      run_id: event.run_id,
      sequence: event.sequence,
      body: event.body,
      payload: event.payload,
      inserted_at: datetime_json(event.inserted_at),
      updated_at: datetime_json(event.updated_at)
    }
  end

  defp cluster_pubsub_message_json(message) do
    %{
      id: message.id,
      run_id: message.run_id,
      payload: message.payload,
      origin_node: message.origin_node,
      sent_at_usec: message.sent_at_usec
    }
  end

  defp datetime_json(nil), do: nil
  defp datetime_json(%DateTime{} = value), do: DateTime.to_iso8601(value)

  defp required_string!(params, key) do
    case Map.get(params, key) do
      value when is_binary(value) and value != "" -> value
      _other -> raise ArgumentError, "missing or invalid #{key}"
    end
  end

  defp integer_param(params, key, default) do
    case Map.get(params, key, default) do
      value when is_integer(value) ->
        value

      value when is_binary(value) ->
        case Integer.parse(value) do
          {parsed, ""} -> parsed
          _other -> raise ArgumentError, "invalid integer #{key}"
        end

      nil ->
        raise ArgumentError, "missing or invalid #{key}"

      _other ->
        raise ArgumentError, "invalid integer #{key}"
    end
  end

  defp atom_param(params, key, default) do
    case Map.get(params, key, default) do
      value when value in [:new, :active, :done] -> value
      value when value in ["new", "active", "done"] -> String.to_existing_atom(value)
      _other -> raise ArgumentError, "invalid status"
    end
  end

  defp map_param(params, key) do
    case Map.get(params, key, %{}) do
      value when is_map(value) -> value
      _other -> raise ArgumentError, "invalid map #{key}"
    end
  end

  defp manifest_version do
    [
      otp_app: :tribe_one_supertest,
      source_manifest_path: Path.expand("../../manifest.json", __DIR__)
    ]
    |> Tribes.Plugin.Base.read_manifest!()
    |> Map.get("version")
  rescue
    _error -> "unknown"
  end
end