import ManualDCore
import Parsing

struct RoomCSVParser: Parser {
  var body: some Parser<Substring.UTF8View, [RoomRowType]> {
    Many {
      RoomRowParser()
    } separator: {
      "\n".utf8
    }
  }
}

struct RoomRowParser: Parser {

  var body: some Parser<Substring.UTF8View, RoomRowType> {
    OneOf {
      RoomCreateParser().map { RoomRowType.room($0) }
      Prefix { $0 != UInt8(ascii: "\n") }
        .map(.string)
        .map { RoomRowType.header($0) }
    }
  }
}

enum RoomRowType {
  case header(String)
  case room(Room.CSV.Row)
}

struct RoomCreateParser: ParserPrinter {

  // FIX: The delegated to field won't work here, as we potentially have not created
  //    the room yet, so we will need an intermediate representation for the csv data
  //    that uses a room's name or disregard and require user to delegate airflow in
  //    the ui.
  var body: some ParserPrinter<Substring.UTF8View, Room.CSV.Row> {
    ParsePrint {
      Prefix { $0 != UInt8(ascii: ",") }.map(.string)
      ",".utf8
      Optionally {
        Int.parser()
          .map(.memberwise(Room.Level.init(rawValue:)))
      }
      ",".utf8
      Double.parser()
      ",".utf8
      Optionally {
        Double.parser()
      }
      ",".utf8
      Optionally {
        Double.parser()
      }
      ",".utf8
      Int.parser()
      ",".utf8
      Optionally {
        Prefix { $0 != UInt8(ascii: "\n") }.map(.string)
      }
    }
    .map(.memberwise(Room.CSV.Row.init))
  }
}