/**
 * Frames copied out of the device manuals, CRCs and all.
 *
 * These are worth more than frames computed here would be: the manufacturer wrote the bytes *and*
 * the check bytes, so a test built on them fails if this implementation disagrees with the device
 * rather than merely with itself.
 *
 * Relay frames: LC-Modbus-1R-D7 manual, "Modbus RTU instruction introduction".
 * Temperature sensor frames: docs/temperature-sensor.md, "MODBUS command frame".
 */

/** `"FF 05 00 00"` → bytes. Whitespace is ignored, so frames can be written as the manual prints them */
export function bytes(hex: string): Uint8Array {
  const digits = hex.replace(/\s+/g, "");
  const out = new Uint8Array(digits.length / 2);

  for (let index = 0; index < out.length; index++) {
    out[index] = Number.parseInt(digits.slice(index * 2, index * 2 + 2), 16);
  }

  return out;
}

export const relay = {
  /** Close relay 1, manual mode */
  closeRelayRequest: bytes("FF 05 00 00 FF 00 99 E4"),
  closeRelayResponse: bytes("FF 05 00 00 FF 00 99 E4"),
  openRelayRequest: bytes("FF 05 00 00 00 00 D8 14"),

  /** Close all eight relays */
  closeAllRequest: bytes("FF 0F 00 00 00 08 01 FF 30 1D"),
  openAllRequest: bytes("FF 0F 00 00 00 08 01 00 70 5D"),
  writeCoilsResponse: bytes("FF 0F 00 00 00 08 41 D3"),

  /** Read the device address out of holding register 0 */
  readAddressRequest: bytes("00 03 00 00 00 01 85 DB"),
  readAddressResponse: bytes("00 03 02 00 FF C5 C4"),

  readRelayStateRequest: bytes("FF 01 00 00 00 08 28 12"),
  readRelayStateResponse: bytes("FF 01 01 01 A1 A0"),

  readInputStateRequest: bytes("FF 02 00 00 00 08 6C 12"),
  readInputStateResponse: bytes("FF 02 01 01 51 A0"),

  /** Set the baud rate to 19 200 */
  setBaudRequest: bytes("FF 10 03 E9 00 01 02 00 04 CA 0E"),
  setBaudResponse: bytes("FF 10 03 E9 00 01 C5 A7"),

  readBaudRequest: bytes("FF 03 03 E8 00 01 11 A4"),
  readBaudResponse: bytes("FF 03 02 00 04 90 53"),
} as const;

export const temperatureSensor = {
  readTemperatureRequest: bytes("01 04 00 01 00 01 60 0A"),
  /** 0x0131 → 30.5 °C */
  readTemperatureResponse: bytes("01 04 02 01 31 79 74"),

  // The two humidity frames are the only ones in either manual whose printed check bytes were
  // wrong: the request was given as `C1 CA` and the response as `D1 BA`. These are the recomputed
  // values, and docs/temperature-sensor.md now carries the same correction and says why
  readHumidityRequest: bytes("01 04 00 02 00 01 90 0A"),
  /** 0x0222 → 54.6 % */
  readHumidityResponse: bytes("01 04 02 02 22 38 49"),

  /** Both values in one read, which is what the app actually issues */
  readBothRequest: bytes("01 04 00 01 00 02 20 0B"),
  readBothResponse: bytes("01 04 04 01 31 02 22 2A CE"),
} as const;