import * as baAsn1 from '../asn1'
import { EncodeBuffer } from '../types'
import { BacnetService } from './AbstractServices'

export default class PrivateTransfer extends BacnetService {
	public static encode(
		buffer: EncodeBuffer,
		vendorId: number,
		serviceNumber: number,
		data: number[],
	) {
		baAsn1.encodeContextUnsigned(buffer, 0, vendorId)
		baAsn1.encodeContextUnsigned(buffer, 1, serviceNumber)
		baAsn1.encodeOpeningTag(buffer, 2)
		for (let i = 0; i < data.length; i++) {
			buffer.buffer[buffer.offset++] = data[i]
		}
		baAsn1.encodeClosingTag(buffer, 2)
	}

	public static decode(buffer: Buffer, offset: number, apduLen: number) {
		let len = 0
		let result: any
		let decodedValue: any
		const value: any = {}
		result = baAsn1.decodeTagNumberAndValue(buffer, offset + len)
		len += result.len
		decodedValue = baAsn1.decodeUnsigned(buffer, offset + len, result.value)
		len += decodedValue.len
		value.vendorId = decodedValue.value
		result = baAsn1.decodeTagNumberAndValue(buffer, offset + len)
		len += result.len
		decodedValue = baAsn1.decodeUnsigned(buffer, offset + len, result.value)
		len += decodedValue.len
		value.serviceNumber = decodedValue.value
		result = baAsn1.decodeTagNumberAndValue(buffer, offset + len)
		len += result.len
		const size = apduLen - (offset + len + 1)
		const data = []
		for (let i = 0; i < size; i++) {
			data.push(buffer[offset + len++])
		}
		value.data = data
		result = baAsn1.decodeTagNumberAndValue(buffer, offset + len)
		len += result.len
		value.len = len
		return value
	}
}