'use strict';
import { BufferLengthError } from './errors/BufferLengthError';
import { InvalidValueError } from './errors/InvalidValueError';
import { DPT } from './definitions';

export class DPT7 implements DPT {
  id = '7';
  name = '16-bit unsigned value';
  bufferLength = 2

  /**
   * Decode a buffer
   *
   * @param buffer the buffer
   * @returns the DPT value
   */
  decoder(buffer: Buffer): number {
    if (buffer.length !== this.bufferLength)
      throw new BufferLengthError(`Invalid buffer length ${buffer.length}/${buffer} for DPT1.  Expected ${this.bufferLength}.`);

    const value = buffer.readUInt16BE(0)

    return value;
  };

  /**
   * Encode a buffer
   *
   * @param value the value to be converted to buffer
   * @returns the buffer
   */
  encoder(value: number): Buffer {
    if (!value)
      throw new InvalidValueError('DPT7: cannot write null value');

    if (value < 0)
      throw new InvalidValueError(`DPT7: Cannot write negative value ${value}`);

    let buf = Buffer.alloc(this.bufferLength);
    buf.writeUInt16BE(value, 0)
    return buf;
  }

  subtypes: {
    // 7.001 pulses
    "001": {
      "use": "G",
      "name": "DPT_Value_2_Ucount",
      "desc": "pulses",
      "unit": "pulses"
    },

    // 7.002 time(ms)
    "002": {
      "use": "G",
      "name": "DPT_TimePeriodMsec",
      "desc": "time (ms)",
      "unit": "milliseconds"
    },

    // 7.003 time (10ms)
    "003": {
      "use": "G",
      "name": "DPT_TimePeriod10Msec",
      "desc": "time (10ms)",
      "unit": "centiseconds"
    },

    // 7.004 time (100ms)
    "004": {
      "use": "G",
      "name": "DPT_TimePeriod100Msec",
      "desc": "time (100ms)",
      "unit": "deciseconds"
    },

    // 7.005 time (sec)
    "005": {
      "use": "G",
      "name": "DPT_TimePeriodSec",
      "desc": "time (s)",
      "unit": "seconds"
    },

    // 7.006 time (min)
    "006": {
      "use": "G",
      "name": "DPT_TimePeriodMin",
      "desc": "time (min)",
      "unit": "minutes"
    },

    // 7.007 time  (hour)
    "007": {
      "use": "G",
      "name": "DPT_TimePeriodHrs",
      "desc": "time (hrs)",
      "unit": "hours"
    },

    // 7.010 DPT_PropDataType
    // not to be used in runtime communications!
    "010": {
      "use": "FB",
      "name": "DPT_PropDataType",
      "desc": "Identifier Interface Object Property data type "
    },

    // 7.011
    "011": {
      "use": "FB SAB",
      "name": "DPT_Length_mm",
      "desc": "Length in mm",
      "unit": "mm"
    },

    // 7.012
    "012": {
      "use": "FB",
      "name": "DPT_UEICurrentmA",
      "desc": "bus power supply current (mA)",
      "unit": "mA"
    },

    // 7.013
    "013": {
      "use": "FB",
      "name": "DPT_Brightness",
      "desc": "interior brightness",
      "unit": "lux"
    }
  };

}