feat: port basic functionality to elixir

lib/components_elixir/inventory/category.ex

@@ -0,0 +1,44 @@
+defmodule ComponentsElixir.Inventory.Category do
+  @moduledoc """
+  Schema for component categories.
+
+  Categories can be hierarchical with parent-child relationships.
+  """
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  alias ComponentsElixir.Inventory.{Category, Component}
+
+  schema "categories" do
+    field :name, :string
+    field :description, :string
+
+    belongs_to :parent, Category
+    has_many :children, Category, foreign_key: :parent_id
+    has_many :components, Component
+
+    timestamps()
+  end
+
+  @doc false
+  def changeset(category, attrs) do
+    category
+    |> cast(attrs, [:name, :description, :parent_id])
+    |> validate_required([:name])
+    |> validate_length(:name, min: 1, max: 255)
+    |> validate_length(:description, max: 1000)
+    |> unique_constraint([:name, :parent_id])
+    |> foreign_key_constraint(:parent_id)
+  end
+
+  @doc """
+  Returns the full path of the category including parent names.
+  """
+  def full_path(%Category{parent: nil} = category), do: category.name
+  def full_path(%Category{parent: %Category{} = parent} = category) do
+    "#{full_path(parent)} > #{category.name}"
+  end
+  def full_path(%Category{parent: %Ecto.Association.NotLoaded{}} = category) do
+    category.name
+  end
+end

lib/components_elixir/inventory/component.ex

@@ -0,0 +1,86 @@
+defmodule ComponentsElixir.Inventory.Component do
+  @moduledoc """
+  Schema for electronic components.
+
+  Each component belongs to a category and tracks inventory information
+  including count, location, and optional image and datasheet.
+  """
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  alias ComponentsElixir.Inventory.Category
+
+  schema "components" do
+    field :name, :string
+    field :description, :string
+    field :keywords, :string
+    field :position, :string
+    field :count, :integer, default: 0
+    field :datasheet_url, :string
+    field :image_filename, :string
+
+    belongs_to :category, Category
+
+    timestamps()
+  end
+
+  @doc false
+  def changeset(component, attrs) do
+    component
+    |> cast(attrs, [:name, :description, :keywords, :position, :count, :datasheet_url, :image_filename, :category_id])
+    |> validate_required([:name, :category_id])
+    |> validate_length(:name, min: 1, max: 255)
+    |> validate_length(:description, max: 2000)
+    |> validate_length(:keywords, max: 500)
+    |> validate_length(:position, max: 100)
+    |> validate_number(:count, greater_than_or_equal_to: 0)
+    |> validate_url(:datasheet_url)
+    |> foreign_key_constraint(:category_id)
+  end
+
+  @doc """
+  Changeset for updating component count.
+  """
+  def count_changeset(component, attrs) do
+    component
+    |> cast(attrs, [:count])
+    |> validate_required([:count])
+    |> validate_number(:count, greater_than_or_equal_to: 0)
+  end
+
+  @doc """
+  Changeset for updating component image.
+  """
+  def image_changeset(component, attrs) do
+    component
+    |> cast(attrs, [:image_filename])
+  end
+
+  defp validate_url(changeset, field) do
+    validate_change(changeset, field, fn ^field, url ->
+      if url && url != "" do
+        case URI.parse(url) do
+          %URI{scheme: scheme} when scheme in ["http", "https"] -> []
+          _ -> [{field, "must be a valid URL"}]
+        end
+      else
+        []
+      end
+    end)
+  end
+
+  @doc """
+  Returns true if the component has an image.
+  """
+  def has_image?(%__MODULE__{image_filename: filename}) when is_binary(filename), do: true
+  def has_image?(_), do: false
+
+  @doc """
+  Returns the search text for this component.
+  """
+  def search_text(%__MODULE__{} = component) do
+    [component.name, component.description, component.keywords]
+    |> Enum.filter(&is_binary/1)
+    |> Enum.join(" ")
+  end
+end