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

  def change do
    # Hourly snapshot of DO account balance + month-to-date usage.
    # Drives the live-accrual side of the cost dashboard.
    create table(:cloud_balance_snapshots, primary_key: false) do
      add :id, :binary_id, primary_key: true
      add :provider, :string, null: false
      add :month_to_date_balance_cents, :integer
      add :account_balance_cents, :integer
      add :month_to_date_usage_cents, :integer
      add :generated_at, :utc_datetime, null: false
      add :raw, :map

      timestamps(type: :utc_datetime, updated_at: false)
    end

    create index(:cloud_balance_snapshots, [:provider, :generated_at])

    # Monthly invoice summary headers (one row per provider invoice).
    create table(:cloud_invoices, primary_key: false) do
      add :id, :binary_id, primary_key: true
      add :provider, :string, null: false
      add :provider_invoice_id, :string, null: false
      add :invoice_period, :date, null: false
      add :amount_cents, :integer
      add :status, :string, default: "open", null: false
      add :issued_at, :utc_datetime
      add :csv_fetched_at, :utc_datetime
      add :lines_ingested_at, :utc_datetime
      add :raw, :map

      timestamps(type: :utc_datetime)
    end

    create unique_index(:cloud_invoices, [:provider, :provider_invoice_id])
    create index(:cloud_invoices, [:invoice_period])

    # Per-line-item COGS. One row per CSV line of a provider invoice.
    # Matched to cloud_resources where possible by (kind, name, region).
    create table(:cloud_cost_lines, primary_key: false) do
      add :id, :binary_id, primary_key: true
      add :invoice_id, references(:cloud_invoices, type: :binary_id, on_delete: :delete_all),
        null: false
      add :resource_id, references(:cloud_resources, type: :binary_id, on_delete: :nilify_all)
      add :invoice_period, :date, null: false
      add :kind, :string
      add :description, :string
      add :qty, :decimal
      add :unit, :string
      add :unit_cost_cents, :integer
      add :amount_cents, :integer, null: false
      add :start_at, :utc_datetime
      add :end_at, :utc_datetime
      add :project_name, :string
      add :category, :string
      add :matched_at, :utc_datetime
      add :raw, :map

      timestamps(type: :utc_datetime, updated_at: false)
    end

    create index(:cloud_cost_lines, [:invoice_id])
    create index(:cloud_cost_lines, [:resource_id])
    create index(:cloud_cost_lines, [:invoice_period])
    create index(:cloud_cost_lines, [:kind])
  end
end