defmodule ArcadiaCloud.Repo.Migrations.CreateCatalog do
  use Ecto.Migration

  def change do
    # Plan identity — the stable thing customers refer to ("Studio").
    create table(:plans, primary_key: false) do
      add :id, :binary_id, primary_key: true
      add :code, :string, null: false
      add :name, :string, null: false
      add :description, :text
      add :active, :boolean, null: false, default: true

      timestamps(type: :utc_datetime)
    end

    create unique_index(:plans, [:code])

    # Versioned pricing. A subscription binds to a specific plan_version;
    # raising prices = publishing a new version, existing subs unaffected
    # until explicitly migrated.
    create table(:plan_versions, primary_key: false) do
      add :id, :binary_id, primary_key: true
      add :plan_id, references(:plans, type: :binary_id, on_delete: :delete_all), null: false
      add :version, :integer, null: false
      add :base_price_cents, :integer, null: false, default: 0
      add :currency, :string, null: false, default: "AUD"
      add :status, :string, null: false, default: "draft"
      add :published_at, :utc_datetime

      timestamps(type: :utc_datetime)
    end

    create unique_index(:plan_versions, [:plan_id, :version])
    create index(:plan_versions, [:status])

    # What a plan version INCLUDES, per resource kind, plus overage terms.
    create table(:plan_items, primary_key: false) do
      add :id, :binary_id, primary_key: true
      add :plan_version_id,
        references(:plan_versions, type: :binary_id, on_delete: :delete_all),
        null: false
      add :resource_kind, :string, null: false
      add :included_qty, :decimal, null: false, default: 0
      add :overage_unit, :string
      add :overage_price_cents, :integer
      add :hard_cap_qty, :decimal

      timestamps(type: :utc_datetime)
    end

    create unique_index(:plan_items, [:plan_version_id, :resource_kind])

    # A la carte upgrades. Not versioned for MVP — price changes apply
    # forward; existing subscription addon refs keep the price snapshotted
    # on the subscription (phase 3 subscriptions chunk).
    create table(:addons, primary_key: false) do
      add :id, :binary_id, primary_key: true
      add :code, :string, null: false
      add :name, :string, null: false
      add :resource_kind, :string, null: false
      add :qty, :decimal, null: false, default: 0
      add :price_cents, :integer, null: false, default: 0
      add :currency, :string, null: false, default: "AUD"
      add :active, :boolean, null: false, default: true

      timestamps(type: :utc_datetime)
    end

    create unique_index(:addons, [:code])

    # Fallback per-unit pricing for ad-hoc / pure-usage items not covered
    # by a plan_item. Effective-dated.
    create table(:resource_prices, primary_key: false) do
      add :id, :binary_id, primary_key: true
      add :resource_kind, :string, null: false
      add :unit, :string, null: false
      add :unit_price_cents, :integer, null: false
      add :currency, :string, null: false, default: "AUD"
      add :effective_from, :date, null: false
      add :effective_to, :date

      timestamps(type: :utc_datetime)
    end

    create index(:resource_prices, [:resource_kind, :effective_from])
  end
end