defmodule CommonsPub.Blocks.Block do

  use Pointers.Pointable,
    otp_app: :cpub_blocks,
    table_id: "B10CK1NGSTVFFAV01DSSEE1NG1",
    source: "cpub_blocks_block"

  require Pointers.Changesets
  alias CommonsPub.Blocks.Block
  alias Pointers.{Changesets, Pointer}
  
  pointable_schema do
    belongs_to :blocker, Pointer
    belongs_to :blocked, Pointer
  end

  @defaults [
    cast:     [:blocker_id, :blocked_id],
    required: [:blocker_id, :blocked_id],
  ]
  def changeset(block \\ %Block{}, attrs, opts \\ []),
    do: Changesets.auto(block, attrs, opts, @defaults)

end
defmodule CommonsPub.Blocks.Block.Migration do

  import Ecto.Migration
  import Pointers.Migration
  alias CommonsPub.Blocks.Block

  @block_table Block.__schema__(:source)

  def migrate_block(index_opts \\ [], dir \\ direction())

  def migrate_block(index_opts, :up) do
    index_opts = Keyword.put_new(index_opts, :using, "hash")
    create_pointable_table(Block) do
      add :blocker_id, strong_pointer()
      add :blocked_id, strong_pointer()
    end
    create index(@block_table, [:blocker_id], index_opts)
    create index(@block_table, [:blocked_id], index_opts)
    create unique_index(@block_table, [:blocker_id, :blocked_id], index_opts)
  end

  def migrate_block(index_opts, :down) do
    drop unique_index(@block_table, [:blocker_id, :blocked_id], index_opts)
    drop index(@block_table, [:blocked_id], index_opts)
    drop index(@block_table, [:blocker_id], index_opts)
    drop_pointable_table(Follow)
  end

end