show original count, current value, percentage remaining and shot history for ammo groups

lib/cannery/ammo.ex

@@ -162,10 +162,12 @@ defmodule Cannery.Ammo do
   @spec list_ammo_groups_for_type(AmmoType.t(), User.t()) :: [AmmoGroup.t()]
   def list_ammo_groups_for_type(%AmmoType{id: ammo_type_id, user_id: user_id}, %User{id: user_id}) do
     Repo.all(
-      from am in AmmoGroup,
-        where: am.ammo_type_id == ^ammo_type_id,
-        where: am.user_id == ^user_id,
-        order_by: am.id
+      from ag in AmmoGroup,
+        left_join: sg in assoc(ag, :shot_groups),
+        where: ag.ammo_type_id == ^ammo_type_id,
+        where: ag.user_id == ^user_id,
+        preload: [shot_groups: sg],
+        order_by: ag.id
     )
   end
 
@@ -182,12 +184,18 @@ defmodule Cannery.Ammo do
   @spec list_ammo_groups(User.t(), include_empty :: boolean()) :: [AmmoGroup.t()]
   def list_ammo_groups(%User{id: user_id}, include_empty \\ false) do
     if include_empty do
-      from am in AmmoGroup, where: am.user_id == ^user_id, order_by: am.id
+      from ag in AmmoGroup,
+        left_join: sg in assoc(ag, :shot_groups),
+        where: ag.user_id == ^user_id,
+        preload: [shot_groups: sg],
+        order_by: ag.id
     else
-      from am in AmmoGroup,
-        where: am.user_id == ^user_id,
-        where: not (am.count == 0),
-        order_by: am.id
+      from ag in AmmoGroup,
+        left_join: sg in assoc(ag, :shot_groups),
+        where: ag.user_id == ^user_id,
+        where: not (ag.count == 0),
+        preload: [shot_groups: sg],
+        order_by: ag.id
     end
     |> Repo.all()
   end
@@ -204,10 +212,12 @@ defmodule Cannery.Ammo do
   @spec list_staged_ammo_groups(User.t()) :: [AmmoGroup.t()]
   def list_staged_ammo_groups(%User{id: user_id}) do
     Repo.all(
-      from am in AmmoGroup,
-        where: am.user_id == ^user_id,
-        where: am.staged == true,
-        order_by: am.id
+      from ag in AmmoGroup,
+        left_join: sg in assoc(ag, :shot_groups),
+        where: ag.user_id == ^user_id,
+        where: ag.staged == true,
+        preload: [shot_groups: sg],
+        order_by: ag.id
     )
   end
 
@@ -226,8 +236,42 @@ defmodule Cannery.Ammo do
 
   """
   @spec get_ammo_group!(AmmoGroup.id(), User.t()) :: AmmoGroup.t()
-  def get_ammo_group!(id, %User{id: user_id}),
-    do: Repo.one!(from am in AmmoGroup, where: am.id == ^id and am.user_id == ^user_id)
+  def get_ammo_group!(id, %User{id: user_id}) do
+    Repo.one!(
+      from ag in AmmoGroup,
+        left_join: sg in assoc(ag, :shot_groups),
+        where: ag.id == ^id,
+        where: ag.user_id == ^user_id,
+        preload: [shot_groups: sg]
+    )
+  end
+
+  @doc """
+  Returns the number of shot rounds for an ammo group
+  """
+  @spec get_used_count(AmmoGroup.t()) :: non_neg_integer()
+  def get_used_count(%AmmoGroup{} = ammo_group) do
+    ammo_group
+    |> Repo.preload(:shot_groups)
+    |> Map.get(:shot_groups)
+    |> Enum.map(fn %{count: count} -> count end)
+    |> Enum.sum()
+  end
+
+  @doc """
+  Calculates the percentage remaining of an ammo group out of 100
+  """
+  @spec get_percentage_remaining(AmmoGroup.t()) :: non_neg_integer()
+  def get_percentage_remaining(%AmmoGroup{count: 0}), do: 0
+
+  def get_percentage_remaining(%AmmoGroup{count: count} = ammo_group) do
+    ammo_group = ammo_group |> Repo.preload(:shot_groups)
+
+    shot_group_sum =
+      ammo_group.shot_groups |> Enum.map(fn %{count: count} -> count end) |> Enum.sum()
+
+    round(count / (count + shot_group_sum) * 100)
+  end
 
   @doc """
   Creates a ammo_group.

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

@@ -33,7 +33,7 @@
               <%= gettext("Price paid") %>
             </th>
             <th class="p-2">
-              <%= gettext("Notes") %>
+              <%= gettext("% left") %>
             </th>
             <th class="p-2">
               <%= gettext("Range") %>
@@ -68,7 +68,7 @@
               </td>
 
               <td class="p-2">
-                <%= ammo_group.notes %>
+                <%= "#{ammo_group |> Ammo.get_percentage_remaining()}%" %>
               </td>
 
               <td class="p-2">

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

@@ -9,6 +9,16 @@
       <%= @ammo_group.count %>
     </span>
 
+    <span class="rounded-lg title text-lg">
+      <%= gettext("Original count:") %>
+      <%= @ammo_group.count + Ammo.get_used_count(@ammo_group) %>
+    </span>
+
+    <span class="rounded-lg title text-lg">
+      <%= gettext("Percentage left:") %>
+      <%= "#{@ammo_group |> Ammo.get_percentage_remaining()}%" %>
+    </span>
+
     <%= if @ammo_group.notes do %>
       <span class="rounded-lg title text-lg">
         <%= gettext("Notes:") %>
@@ -18,11 +28,20 @@
 
     <%= if @ammo_group.price_paid do %>
       <span class="rounded-lg title text-lg">
-        <%= gettext("Price paid:") %>
+        <%= gettext("Original cost:") %>
         <%= gettext("$%{amount}",
           amount: @ammo_group.price_paid |> :erlang.float_to_binary(decimals: 2)
         ) %>
       </span>
+
+      <span class="rounded-lg title text-lg">
+        <%= gettext("Current value:") %>
+        <%= gettext("$%{amount}",
+          amount:
+            (@ammo_group.price_paid * Ammo.get_percentage_remaining(@ammo_group) / 100)
+            |> :erlang.float_to_binary(decimals: 2)
+        ) %>
+      </span>
     <% end %>
   </div>
 
@@ -84,6 +103,47 @@
       <%= gettext("This ammo group is not in a container") %>
     <% end %>
   </div>
+
+  <%= unless @ammo_group.shot_groups |> Enum.empty?() do %>
+    <hr class="mb-4 w-full" />
+
+    <h1 class="mb-4 px-4 py-2 text-center rounded-lg title text-xl">
+      <%= gettext("Rounds used") %>
+    </h1>
+
+    <div class="w-full overflow-x-auto border border-gray-600 rounded-lg shadow-lg bg-black">
+      <table class="min-w-full table-auto text-center bg-white">
+        <thead class="border-b border-primary-600">
+          <tr>
+            <th class="p-2">
+              <%= gettext("Rounds shot") %>
+            </th>
+            <th class="p-2">
+              <%= gettext("Notes") %>
+            </th>
+            <th class="p-2">
+              <%= gettext("Date") %>
+            </th>
+          </tr>
+        </thead>
+        <tbody id="shot_groups">
+          <%= for shot_group <- @ammo_group.shot_groups do %>
+            <tr id={"shot_group-#{shot_group.id}"}>
+              <td class="p-2">
+                <%= shot_group.count %>
+              </td>
+              <td class="p-2">
+                <%= shot_group.notes %>
+              </td>
+              <td class="p-2">
+                <%= shot_group.date |> display_date() %>
+              </td>
+            </tr>
+          <% end %>
+        </tbody>
+      </table>
+    </div>
+  <% end %>
 </div>
 
 <%= case @live_action do %>