defmodule BallsPDS.Repo.Migrations.Initial do
  use Ecto.Migration

  def change do
    create table(:agents) do
      add :acl, :text, null: false
      add :public_key, :text, null: false
      add :disabled, :boolean, default: false, null: false

      timestamps()
    end

    create unique_index(:agents, [:acl])

    create table(:objects) do
      # Fake path that always resembles a slash-separated, slash-prepended filesystem path.
      add :path, :text, null: false
      add :content_type, :text, null: false
      # Mainly used to identify collections.
      add :activitypub_type, :text
      # In practice, filename on filesystem. Null for collections.
      add :storage_key, :text
      # Query shortcut for public objects to avoid join.
      add :public, :boolean, default: false, null: false

      # Only used for collections to avoid counting.
      add :total_items, :integer

      timestamps()
    end

    create unique_index(:objects, [:path])
    create index(:objects, [:activitypub_type])

    # Who can read an object (only the owner can write right now.)
    create table(:object_read_agents, primary_key: false) do
      add :object_id, references(:objects), null: false
      add :agent_id, references(:agents), null: false
    end

    create unique_index(:object_read_agents, [:object_id, :agent_id])

    create table(:collection_objects) do
      add :collection_id, references(:objects), null: false
      add :object_id, references(:objects)
      add :remote_id, :string
      # Results are sorted in ascending order on this arbitrary value.
      add :order_num, :integer
    end

    create unique_index(:collection_objects, [:collection_id, :remote_id])
  end
end