import Foundation

// Network awaits alone do not move JSON processing off the main actor.
actor SheetWireWorker {
  func decode(_ data: Data) throws -> GridResponse {
    try JSONDecoder().decode(GridResponse.self, from: data)
  }

  func encode(_ writes: [CellWrite], startingAt offset: Int) throws -> (data: Data, count: Int) {
    struct Batch: Encodable { let cells: [CellWrite] }
    var count = min(500, writes.count - offset)
    var data = try JSONEncoder().encode(Batch(cells: Array(writes[offset..<offset + count])))
    while data.count > 1 << 20 && count > 1 {
      count /= 2
      data = try JSONEncoder().encode(Batch(cells: Array(writes[offset..<offset + count])))
    }
    return (data, count)
  }
}