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

  def change do
    # A deployment is the billable unit — one app instance. A tenant has
    # 1..N deployments; resources tag to a deployment via
    # cloud_resources.deployment_id (already migrated).
    create table(:cloud_deployments, primary_key: false) do
      add :id, :binary_id, primary_key: true
      add :tenant_id, :string, null: false
      add :cloud_project_id, references(:cloud_projects, type: :binary_id, on_delete: :nilify_all)
      add :slug, :string, null: false
      add :display_name, :string
      # template_code/version nullable — phase 3 pilot deployments are
      # provisioned by hand; formal templates land in phase 4.
      add :template_code, :string
      add :template_version, :string
      add :region, :string
      add :state, :string, null: false, default: "active"
      add :state_since, :utc_datetime, null: false
      add :llm_mode, :string, null: false, default: "none"
      # operator override: keep this deployment running even when billing
      # rules would otherwise suspend it.
      add :billing_action_suspended, :boolean, null: false, default: false

      timestamps(type: :utc_datetime)
    end

    create unique_index(:cloud_deployments, [:tenant_id, :slug])
    create index(:cloud_deployments, [:tenant_id])
    create index(:cloud_deployments, [:state])

    create table(:cloud_deployment_events, primary_key: false) do
      add :id, :binary_id, primary_key: true
      add :deployment_id,
        references(:cloud_deployments, type: :binary_id, on_delete: :delete_all),
        null: false
      add :from_state, :string
      add :to_state, :string, null: false
      add :reason, :string
      add :actor, :string
      add :notes, :text
      add :occurred_at, :utc_datetime, null: false
    end

    create index(:cloud_deployment_events, [:deployment_id, :occurred_at])

    # One subscription per deployment — binds it to a plan version.
    create table(:subscriptions, primary_key: false) do
      add :id, :binary_id, primary_key: true
      add :deployment_id,
        references(:cloud_deployments, type: :binary_id, on_delete: :delete_all),
        null: false
      add :plan_version_id,
        references(:plan_versions, type: :binary_id, on_delete: :restrict),
        null: false
      add :status, :string, null: false, default: "active"
      add :current_period_start, :date, null: false
      add :current_period_end, :date, null: false
      add :trial_ends_at, :date

      timestamps(type: :utc_datetime)
    end

    create unique_index(:subscriptions, [:deployment_id])
    create index(:subscriptions, [:plan_version_id])
    create index(:subscriptions, [:status])

    # Addons attached to a subscription. Price/qty are SNAPSHOTTED at
    # attach time so later catalog changes don't retroactively reprice.
    create table(:subscription_addons, primary_key: false) do
      add :id, :binary_id, primary_key: true
      add :subscription_id,
        references(:subscriptions, type: :binary_id, on_delete: :delete_all),
        null: false
      add :addon_id, references(:addons, type: :binary_id, on_delete: :restrict), null: false
      add :resource_kind, :string, null: false
      add :qty, :decimal, null: false
      add :price_cents, :integer, null: false
      add :currency, :string, null: false, default: "AUD"
      add :attached_at, :utc_datetime, null: false

      timestamps(type: :utc_datetime)
    end

    create index(:subscription_addons, [:subscription_id])
  end
end