defmodule NewRelic.Harvest.Collector.MetricData do
  # Heper functions for generating Metrics with the correct timeslice values

  @moduledoc false

  alias NewRelic.Metric

  def transform({:transaction, name}, duration_s: duration_s),
    do: [
      %Metric{
        name: "HttpDispatcher",
        call_count: 1,
        total_call_time: duration_s,
        total_exclusive_time: duration_s,
        min_call_time: duration_s,
        max_call_time: duration_s
      },
      %Metric{
        name: "WebTransaction",
        call_count: 1,
        total_call_time: duration_s,
        total_exclusive_time: duration_s,
        min_call_time: duration_s,
        max_call_time: duration_s
      },
      %Metric{
        name: join("WebTransaction", name),
        call_count: 1,
        total_call_time: duration_s,
        total_exclusive_time: duration_s,
        min_call_time: duration_s,
        max_call_time: duration_s
      }
    ]

  def transform({:datastore, name}, duration_s: duration_s),
    do: [
      %Metric{
        name: join("Datastore/statement/Postgres", name),
        call_count: 1,
        total_call_time: duration_s,
        total_exclusive_time: duration_s,
        min_call_time: duration_s,
        max_call_time: duration_s
      },
      %Metric{
        name: "Datastore/Postgres/all",
        call_count: 1,
        total_call_time: duration_s,
        total_exclusive_time: duration_s,
        min_call_time: duration_s,
        max_call_time: duration_s
      }
    ]

  def transform({:external, name}, duration_s: duration_s),
    do: [
      %Metric{
        name: join("External", name, "all"),
        call_count: 1,
        total_call_time: duration_s,
        total_exclusive_time: duration_s,
        min_call_time: duration_s,
        max_call_time: duration_s
      },
      %Metric{
        name: "External/allWeb",
        call_count: 1,
        total_call_time: duration_s,
        total_exclusive_time: duration_s,
        min_call_time: duration_s,
        max_call_time: duration_s
      }
    ]

  def transform(:error, error_count: error_count),
    do: %Metric{
      name: "Errors/all",
      call_count: error_count
    }

  def transform({:supportability, :error_event}, error_count: error_count),
    do: [
      %Metric{
        name: "Supportability/Events/TransactionError/Sent",
        call_count: error_count
      },
      %Metric{
        name: "Supportability/Events/TransactionError/Seen",
        call_count: error_count
      }
    ]

  def transform({:supportability, harvester}, harvest_size: harvest_size),
    do: [
      %Metric{
        name: "Supportability/Elixir/Collector/HarvestSize/#{inspect(harvester)}",
        call_count: harvest_size
      },
      %Metric{
        name: "Supportability/Harvest",
        call_count: 1
      }
    ]

  defp join(prefix, name, suffix \\ nil)
  defp join(prefix, "/" <> name, suffix), do: join(prefix, name, suffix)

  defp join(prefix, name, suffix),
    do: [prefix, name, suffix] |> Enum.filter(& &1) |> Enum.join("/")
end