# frozen_string_literal: true

class CreateLfsObjectStates < Gitlab::Database::Migration[1.0]
  VERIFICATION_STATE_INDEX_NAME = "index_lfs_object_states_on_verification_state"
  PENDING_VERIFICATION_INDEX_NAME = "index_lfs_object_states_pending_verification"
  FAILED_VERIFICATION_INDEX_NAME = "index_lfs_object_states_failed_verification"
  NEEDS_VERIFICATION_INDEX_NAME = "index_lfs_object_states_needs_verification"

  disable_ddl_transaction!

  def up
    create_table :lfs_object_states, id: false do |t|
      t.datetime_with_timezone :verification_started_at
      t.datetime_with_timezone :verification_retry_at
      t.datetime_with_timezone :verified_at
      t.references :lfs_object, primary_key: true, null: false, foreign_key: { on_delete: :cascade }
      t.integer :verification_state, default: 0, limit: 2, null: false
      t.integer :verification_retry_count, limit: 2
      t.binary :verification_checksum, using: 'verification_checksum::bytea'
      t.text :verification_failure, limit: 255

      t.index :verification_state, name: VERIFICATION_STATE_INDEX_NAME
      t.index :verified_at, where: "(verification_state = 0)", order: { verified_at: 'ASC NULLS FIRST' }, name: PENDING_VERIFICATION_INDEX_NAME
      t.index :verification_retry_at, where: "(verification_state = 3)", order: { verification_retry_at: 'ASC NULLS FIRST' }, name: FAILED_VERIFICATION_INDEX_NAME
      t.index :verification_state, where: "(verification_state = 0 OR verification_state = 3)", name: NEEDS_VERIFICATION_INDEX_NAME
    end
  end

  def down
    drop_table :lfs_object_states
  end
end