final class SearchMessagesDataSource: ValueCellDataSource {
  internal enum Section: Int {
    case emptyState
    case messageThreads
  }

  internal func load(messageThreads: [MessageThread]) {
    self.set(
      values: messageThreads,
      cellClass: MessageThreadCell.self,
      inSection: Section.messageThreads.rawValue
    )
  }

  internal func emptyState(isVisible: Bool) {
    self.set(
      cellIdentifiers: isVisible ? ["SearchMessagesEmptyState"] : [],
      inSection: Section.emptyState.rawValue
    )
  }

  internal override func configureCell(tableCell cell: UITableViewCell, withValue value: Any) {
    switch (cell, value) {
    case let (cell as MessageThreadCell, value as MessageThread):
      cell.configureWith(value: value)
    case (is StaticTableViewCell, is Void):
      return
    default:
      assertionFailure("Unrecognized combo: \(cell), \(value).")
    }
  }
}