add range mode

lib/cannery/activity_log.ex

@@ -0,0 +1,198 @@
+defmodule Cannery.ActivityLog do
+  @moduledoc """
+  The ActivityLog context.
+  """
+
+  import Ecto.Query, warn: false
+  import CanneryWeb.Gettext
+  alias Cannery.{Accounts.User, ActivityLog.ShotGroup, Ammo, Ammo.AmmoGroup, Repo}
+  alias Ecto.{Changeset, Multi}
+
+  @doc """
+  Returns the list of shot_groups.
+
+  ## Examples
+
+      iex> list_shot_groups(%User{id: 123})
+      [%ShotGroup{}, ...]
+
+  """
+  @spec list_shot_groups(User.t()) :: [ShotGroup.t()]
+  def list_shot_groups(%User{id: user_id}) do
+    Repo.all(from(sg in ShotGroup, where: sg.user_id == ^user_id))
+  end
+
+  @doc """
+  Gets a single shot_group.
+
+  Raises `Ecto.NoResultsError` if the Shot group does not exist.
+
+  ## Examples
+
+      iex> get_shot_group!(123, %User{id: 123})
+      %ShotGroup{}
+
+      iex> get_shot_group!(456, %User{id: 123})
+      ** (Ecto.NoResultsError)
+
+  """
+  @spec get_shot_group!(ShotGroup.id(), User.t()) :: ShotGroup.t()
+  def get_shot_group!(id, %User{id: user_id}) do
+    Repo.one!(
+      from sg in ShotGroup,
+        where: sg.id == ^id,
+        where: sg.user_id == ^user_id,
+        order_by: sg.date
+    )
+  end
+
+  @doc """
+  Creates a shot_group.
+
+  ## Examples
+
+      iex> create_shot_group(%{field: value}, %User{id: 123})
+      {:ok, %ShotGroup{}}
+
+      iex> create_shot_group(%{field: bad_value}, %User{id: 123})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  @spec create_shot_group(attrs :: map(), User.t(), AmmoGroup.t()) ::
+          {:ok, ShotGroup.t()} | {:error, Changeset.t(ShotGroup.t()) | nil}
+  def create_shot_group(
+        attrs,
+        %User{id: user_id},
+        %AmmoGroup{id: ammo_group_id, count: ammo_group_count, user_id: user_id} = ammo_group
+      ) do
+    attrs = attrs |> Map.merge(%{"user_id" => user_id, "ammo_group_id" => ammo_group_id})
+    changeset = %ShotGroup{} |> ShotGroup.create_changeset(attrs)
+    shot_group_count = changeset |> Changeset.get_field(:count)
+
+    if shot_group_count > ammo_group_count do
+      error = dgettext("errors", "Count must be less than %{count}", count: ammo_group_count)
+      changeset = changeset |> Changeset.add_error(:count, error)
+      {:error, changeset}
+    else
+      Multi.new()
+      |> Multi.insert(:create_shot_group, changeset)
+      |> Multi.update(
+        :update_ammo_group,
+        ammo_group |> AmmoGroup.range_changeset(%{"count" => ammo_group_count - shot_group_count})
+      )
+      |> Repo.transaction()
+      |> case do
+        {:ok, %{create_shot_group: shot_group}} -> {:ok, shot_group}
+        {:error, :create_shot_group, changeset, _changes_so_far} -> {:error, changeset}
+        {:error, _other_transaction, _value, _changes_so_far} -> {:error, nil}
+      end
+    end
+  end
+
+  @doc """
+  Updates a shot_group.
+
+  ## Examples
+
+      iex> update_shot_group(shot_group, %{field: new_value}, %User{id: 123})
+      {:ok, %ShotGroup{}}
+
+      iex> update_shot_group(shot_group, %{field: bad_value}, %User{id: 123})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  @spec update_shot_group(ShotGroup.t(), attrs :: map(), User.t()) ::
+          {:ok, ShotGroup.t()} | {:error, Changeset.t(ShotGroup.t()) | nil}
+  def update_shot_group(
+        %ShotGroup{count: count, user_id: user_id, ammo_group_id: ammo_group_id} = shot_group,
+        attrs,
+        %User{id: user_id} = user
+      ) do
+    %{count: ammo_group_count, user_id: ^user_id} =
+      ammo_group = ammo_group_id |> Ammo.get_ammo_group!(user)
+
+    changeset = shot_group |> ShotGroup.update_changeset(attrs)
+    new_shot_group_count = changeset |> Changeset.get_field(:count)
+    shot_diff_to_add = new_shot_group_count - count
+
+    cond do
+      shot_diff_to_add > ammo_group_count ->
+        error = dgettext("errors", "Count must be less than %{count}", count: ammo_group_count)
+        changeset = changeset |> Changeset.add_error(:count, error)
+        {:error, changeset}
+
+      new_shot_group_count <= 0 ->
+        error = dgettext("errors", "Count must be at least 1")
+        changeset = changeset |> Changeset.add_error(:count, error)
+        {:error, changeset}
+
+      true ->
+        Multi.new()
+        |> Multi.update(:update_shot_group, changeset)
+        |> Multi.update(
+          :update_ammo_group,
+          ammo_group
+          |> AmmoGroup.range_changeset(%{"count" => ammo_group_count - shot_diff_to_add})
+        )
+        |> Repo.transaction()
+        |> case do
+          {:ok, %{update_shot_group: shot_group}} -> {:ok, shot_group}
+          {:error, :update_shot_group, changeset, _changes_so_far} -> {:error, changeset}
+          {:error, _other_transaction, _value, _changes_so_far} -> {:error, nil}
+        end
+    end
+  end
+
+  @doc """
+  Deletes a shot_group.
+
+  ## Examples
+
+      iex> delete_shot_group(shot_group, %User{id: 123})
+      {:ok, %ShotGroup{}}
+
+      iex> delete_shot_group(shot_group, %User{id: 123})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  @spec delete_shot_group(ShotGroup.t(), User.t()) ::
+          {:ok, ShotGroup.t()} | {:error, Changeset.t(ShotGroup.t())}
+  def delete_shot_group(
+        %ShotGroup{count: count, user_id: user_id, ammo_group_id: ammo_group_id} = shot_group,
+        %User{id: user_id} = user
+      ) do
+    %{count: ammo_group_count, user_id: ^user_id} =
+      ammo_group = ammo_group_id |> Ammo.get_ammo_group!(user)
+
+    Multi.new()
+    |> Multi.delete(:delete_shot_group, shot_group)
+    |> Multi.update(
+      :update_ammo_group,
+      ammo_group
+      |> AmmoGroup.range_changeset(%{"count" => ammo_group_count + count})
+    )
+    |> Repo.transaction()
+    |> case do
+      {:ok, %{delete_shot_group: shot_group}} -> {:ok, shot_group}
+      {:error, :delete_shot_group, changeset, _changes_so_far} -> {:error, changeset}
+      {:error, _other_transaction, _value, _changes_so_far} -> {:error, nil}
+    end
+  end
+
+  @doc """
+  Returns an `%Ecto.Changeset{}` for tracking shot_group changes.
+
+  ## Examples
+
+      iex> change_shot_group(shot_group)
+      %Ecto.Changeset{data: %ShotGroup{}}
+
+  """
+  @spec change_shot_group(ShotGroup.t() | ShotGroup.new_shot_group()) ::
+          Changeset.t(ShotGroup.t() | ShotGroup.new_shot_group())
+  @spec change_shot_group(ShotGroup.t() | ShotGroup.new_shot_group(), attrs :: map()) ::
+          Changeset.t(ShotGroup.t() | ShotGroup.new_shot_group())
+  def change_shot_group(%ShotGroup{} = shot_group, attrs \\ %{}) do
+    shot_group |> ShotGroup.update_changeset(attrs)
+  end
+end