display cpr for ammo packs and add original count for ammo packs

lib/cannery/ammo.ex

@@ -513,6 +513,28 @@ defmodule Cannery.Ammo do
     round(count / (count + shot_group_sum) * 100)
   end
 
+  @doc """
+  Gets the original count for an ammo group
+  """
+  @spec get_original_count(AmmoGroup.t()) :: non_neg_integer()
+  def get_original_count(%AmmoGroup{count: count} = ammo_group) do
+    count + get_used_count(ammo_group)
+  end
+
+  @doc """
+  Calculates the CPR for a single ammo group
+  """
+  @spec get_cpr(AmmoGroup.t()) :: nil | float()
+  def get_cpr(%AmmoGroup{price_paid: nil}), do: nil
+
+  def get_cpr(%AmmoGroup{price_paid: price_paid} = ammo_group),
+    do: calculate_cpr(price_paid, get_original_count(ammo_group))
+
+  @spec calculate_cpr(price_paid :: float() | nil, count :: integer()) :: float() | nil
+  defp calculate_cpr(nil, _count), do: nil
+  defp calculate_cpr(_price_paid, 0), do: nil
+  defp calculate_cpr(price_paid, total_count), do: price_paid / total_count
+
   @doc """
   Creates multiple ammo_groups at once.
 

lib/cannery_web/components/ammo_group_card.ex

@@ -17,6 +17,7 @@ defmodule CanneryWeb.Components.AmmoGroupCard do
 
     preloads = if show_container, do: [:ammo_type, :container], else: [:ammo_type]
     ammo_group = ammo_group |> Repo.preload(preloads)
+
     assigns = assigns |> assign(:ammo_group, ammo_group)
 
     ~H"""
@@ -38,6 +39,13 @@ defmodule CanneryWeb.Components.AmmoGroupCard do
           <%= if @ammo_group.count == 0, do: gettext("Empty"), else: @ammo_group.count %>
         </span>
 
+        <%= if @ammo_group |> Ammo.get_original_count() != @ammo_group.count do %>
+          <span class="rounded-lg title text-lg">
+            <%= gettext("Original Count:") %>
+            <%= @ammo_group |> Ammo.get_original_count() %>
+          </span>
+        <% end %>
+
         <%= if @ammo_group.notes do %>
           <span class="rounded-lg title text-lg">
             <%= gettext("Notes:") %>
@@ -64,6 +72,13 @@ defmodule CanneryWeb.Components.AmmoGroupCard do
               amount: @ammo_group.price_paid |> :erlang.float_to_binary(decimals: 2)
             ) %>
           </span>
+
+          <span class="rounded-lg title text-lg">
+            <%= gettext("CPR:") %>
+            <%= gettext("$%{amount}",
+              amount: @ammo_group |> Ammo.get_cpr() |> :erlang.float_to_binary(decimals: 2)
+            ) %>
+          </span>
         <% end %>
 
         <%= if @show_container and @ammo_group.container do %>

lib/cannery_web/components/ammo_group_table_component.ex

@@ -82,11 +82,19 @@ defmodule CanneryWeb.Components.AmmoGroupTableComponent do
     columns = [
       %{label: gettext("Count"), key: :count},
       %{label: gettext("Price paid"), key: :price_paid},
+      %{label: gettext("CPR"), key: :cpr},
       %{label: gettext("% left"), key: :remaining},
       %{label: gettext("Notes"), key: :notes}
       | columns
     ]
 
+    columns =
+      if show_used do
+        [%{label: gettext("Original Count"), key: :original_count} | columns]
+      else
+        columns
+      end
+
     columns =
       if ammo_type == [] do
         columns
@@ -215,6 +223,18 @@ defmodule CanneryWeb.Components.AmmoGroupTableComponent do
      """}
   end
 
+  defp get_value_for_key(:original_count, ammo_group, _additional_data),
+    do: ammo_group |> Ammo.get_original_count()
+
+  defp get_value_for_key(:cpr, %{price_paid: nil}, _additional_data),
+    do: gettext("No cost information")
+
+  defp get_value_for_key(:cpr, ammo_group, _additional_data) do
+    gettext("$%{amount}",
+      amount: ammo_group |> Ammo.get_cpr() |> :erlang.float_to_binary(decimals: 2)
+    )
+  end
+
   defp get_value_for_key(:count, %{count: count}, _additional_data),
     do: if(count == 0, do: gettext("Empty"), else: count)
 

lib/cannery_web/live/ammo_group_live/show.html.heex

@@ -11,7 +11,7 @@
 
     <span class="rounded-lg title text-lg">
       <%= gettext("Original count:") %>
-      <%= @ammo_group.count + Ammo.get_used_count(@ammo_group) %>
+      <%= Ammo.get_original_count(@ammo_group) %>
     </span>
 
     <span class="rounded-lg title text-lg">