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(
        {:caller, parent_type, parent_account_id, parent_app_id, transport_type},
        duration_s: duration_s
      ),
      do: [
        %Metric{
          name:
            join([
              "DurationByCaller",
              parent_type,
              parent_account_id,
              parent_app_id,
              transport_type,
              "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({: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(:memory, mb: memory_mb),
    do: %Metric{
      name: "Memory/Physical",
      call_count: 1,
      total_call_time: memory_mb
    }

  def transform(:cpu, utilization: utilization),
    do: %Metric{
      name: "CPU/User Time",
      call_count: 1,
      total_call_time: utilization
    }

  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/Elixir/Harvest",
        call_count: 1
      },
      %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(segments) when is_list(segments), do: segments |> Enum.filter(& &1) |> Enum.join("/")
end