chore(growth): apply scorer behaviour in indicators

lib/growth/score/arm_circumference.ex

@@ -2,4 +2,17 @@ defmodule Growth.Score.ArmCircumference do
   @moduledoc """
   Calculate z-score for arm circumference for age.
   """
+
+  @behaviour Growth.Score.Scorer
+
+  alias Growth.Score.Scorer
+
+  @impl Scorer
+  @spec measure_name() :: atom()
+  @doc """
+  Name of the measurement used in arm circumference indicator.
+  """
+  def measure_name do
+    :arm_circumference
+  end
 end

lib/growth/score/bmi.ex

@@ -3,69 +3,16 @@ defmodule Growth.Score.BMI do
   Calculate z-score for body mass index for age.
   """
 
-  alias Growth.Calc.Centile
-  alias Growth.Calc.ZScore
+  @behaviour Growth.Score.Scorer
 
-  @spec result(Growth.t()) :: Growth.t()
+  alias Growth.Score.Scorer
+
+  @impl Scorer
+  @spec measure_name() :: atom()
   @doc """
-  Calculate z-score and centile values and add them to the growth measurement results.
+  Name of the measurement used in BMI indicator.
   """
-
-  def result(%Growth{bmi: nil} = measure) do
-    measure
-  end
-
-  def result(%Growth{results: results} = measure) do
-    result =
-      measure
-      |> lms()
-      |> Enum.map(fn {precision, {l, m, s}} ->
-        {precision, {z_score(measure.bmi, l, m, s), centile(measure.bmi, l, m, s)}}
-      end)
-
-    %{measure | results: [%{bmi: result} | results]}
-  end
-
-  @spec lms(Growth.t()) :: [{String.t(), {number(), number(), number()}}]
-  @doc """
-  Get the fitted values of Box-Cox:
-
-  * power (`l`)
-  * median (`m`)
-  * coefficient of variation (`s`)
-
-  """
-  def lms(%Growth{} = measure) do
-    [
-      {measure.gender, "day", measure.age_in_days},
-      {measure.gender, "week", measure.age_in_weeks},
-      {measure.gender, "month", measure.age_in_months}
-    ]
-    |> Enum.map(fn {_, precision, _} = key ->
-      case :ets.lookup(__MODULE__, key) do
-        [{^key, %{l: l, m: m, s: s}} | _] ->
-          {precision, {l, m, s}}
-
-        _ ->
-          nil
-      end
-    end)
-    |> Enum.reject(&is_nil/1)
-  end
-
-  @spec z_score(number(), number(), number(), number()) :: number()
-  @doc """
-  Check `Growth.Calc.ZScore.compute/4`.
-  """
-  def z_score(value, l, m, s) do
-    ZScore.compute(value, l, m, s)
-  end
-
-  @spec centile(number(), number(), number(), number()) :: number() | :na
-  @doc """
-  Check `Growth.Calc.Centile.compute/4`.
-  """
-  def centile(value, l, m, s) do
-    Centile.compute(value, l, m, s)
+  def measure_name do
+    :bmi
   end
 end

lib/growth/score/head_circumference.ex

@@ -2,4 +2,17 @@ defmodule Growth.Score.HeadCircumference do
   @moduledoc """
   Calculate z-score for head circumference for age.
   """
+
+  @behaviour Growth.Score.Scorer
+
+  alias Growth.Score.Scorer
+
+  @impl Scorer
+  @spec measure_name() :: atom()
+  @doc """
+  Name of the measurement used in head circumference indicator.
+  """
+  def measure_name do
+    :head_circumference
+  end
 end

lib/growth/score/height.ex

@@ -2,4 +2,17 @@ defmodule Growth.Score.Height do
   @moduledoc """
   Calculate z-score for height for age.
   """
+
+  @behaviour Growth.Score.Scorer
+
+  alias Growth.Score.Scorer
+
+  @impl Scorer
+  @spec measure_name() :: atom()
+  @doc """
+  Name of the measurement used in height indicator.
+  """
+  def measure_name do
+    :height
+  end
 end

lib/growth/score/subscapular_skinfold.ex

@@ -2,4 +2,17 @@ defmodule Growth.Score.SubscapularSkinfold do
   @moduledoc """
   Calculate z-score for subscapular skinfold for age.
   """
+
+  @behaviour Growth.Score.Scorer
+
+  alias Growth.Score.Scorer
+
+  @impl Scorer
+  @spec measure_name() :: atom()
+  @doc """
+  Name of the measurement used in subscapular skinfold indicator.
+  """
+  def measure_name do
+    :subscapular_circumference
+  end
 end

lib/growth/score/triceps_skinfold.ex

@@ -2,4 +2,17 @@ defmodule Growth.Score.TricepsSkinfold do
   @moduledoc """
   Calculate z-score for triceps skinfold for age.
   """
+
+  @behaviour Growth.Score.Scorer
+
+  alias Growth.Score.Scorer
+
+  @impl Scorer
+  @spec measure_name() :: atom()
+  @doc """
+  Name of the measurement used in triceps skinfold indicator.
+  """
+  def measure_name do
+    :triceps_skinfold
+  end
 end

lib/growth/score/weight.ex

@@ -2,4 +2,17 @@ defmodule Growth.Score.Weight do
   @moduledoc """
   Calculate z-score for weight for age.
   """
+
+  @behaviour Growth.Score.Scorer
+
+  alias Growth.Score.Scorer
+
+  @impl Scorer
+  @spec measure_name() :: atom()
+  @doc """
+  Name of the measurement used in weight indicator.
+  """
+  def measure_name do
+    :weight
+  end
 end