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

  def change do
    create table(:saga_runs, primary_key: false) do
      add :id, :binary_id, primary_key: true
      add :deployment_id, :binary_id
      add :kind, :string, null: false
      add :status, :string, null: false, default: "pending"
      add :step_modules, {:array, :string}, null: false
      add :current_step_idx, :integer, null: false, default: 0
      add :context, :map, null: false, default: %{}
      add :started_at, :utc_datetime
      add :completed_at, :utc_datetime
      add :cancel_requested, :boolean, null: false, default: false
      add :error, :map
      add :triggered_by, :string

      timestamps(type: :utc_datetime)
    end

    create index(:saga_runs, [:status])
    create index(:saga_runs, [:kind])
    create index(:saga_runs, [:deployment_id])

    create table(:saga_step_results, primary_key: false) do
      add :id, :binary_id, primary_key: true
      add :saga_id, references(:saga_runs, type: :binary_id, on_delete: :delete_all), null: false
      add :step_idx, :integer, null: false
      add :step_name, :string, null: false
      add :status, :string, null: false
      add :output, :map, default: %{}, null: false
      add :attempts, :integer, default: 0, null: false
      add :started_at, :utc_datetime
      add :completed_at, :utc_datetime
      add :error, :map
    end

    create unique_index(:saga_step_results, [:saga_id, :step_idx])
    create index(:saga_step_results, [:saga_id, :status])

    # Desired-state for everything WE provisioned. Lets us detect drift
    # between cloud_resources (actual) and this (intended).
    create table(:cloud_provisioned, primary_key: false) do
      add :id, :binary_id, primary_key: true
      add :resource_id, references(:cloud_resources, type: :binary_id, on_delete: :delete_all),
        null: false
      add :spec, :map, null: false, default: %{}
      add :spec_version, :integer, null: false, default: 1
      add :provisioned_at, :utc_datetime, null: false
      add :provisioned_by, :string
      add :saga_id, references(:saga_runs, type: :binary_id, on_delete: :nilify_all)

      timestamps(type: :utc_datetime)
    end

    create unique_index(:cloud_provisioned, [:resource_id])
    create index(:cloud_provisioned, [:saga_id])
  end
end