mtoBatchWriter.ts

import { type DateString } from '@cityssm/utils-datetime'

import { NEWLINE, dateStringToYymmdd } from './utilities.js'

export interface MTOBatchWriterConfig {
  authorizedUser: string
  sentDate: DateString
  includeLabels: boolean
}

export interface MTOBatchWriterEntry {
  licencePlateNumber: string
  ticketNumber: string
  issueDate: DateString
}

export class MTOBatchWriter {
  readonly #config: MTOBatchWriterConfig
  readonly #batchEntries: MTOBatchWriterEntry[]

  constructor(config: MTOBatchWriterConfig, batchEntries?: MTOBatchWriterEntry[]) {
    this.#config = config
    this.#batchEntries = batchEntries ?? []
  }

  addBatchEntry(batchEntry: MTOBatchWriterEntry): void {
    this.#batchEntries.push(batchEntry)
  }

  getBatchSize(): number {
    return this.#batchEntries.length
  }

  writeBatch(): string {
    let output = ''

    /*
     * RECORD ROWS
     * -----------
     * Record Id       | 4 characters  | "PKTD"
     * Plate Number    | 10 characters | "XXXX111   "
     * Issue Date      | 6 numbers     | YYMMDD
     * Ticket Number   | 23 characters | "XX00000                  "
     * Authorized User | 4 characters  | "XX00"
     */

    const authorizedUserPadded = this.#config.authorizedUser
      .padStart(4)
      .slice(0, 4)

    for (const entry of this.#batchEntries) {
      output +=
        'PKTD' +
        entry.licencePlateNumber.padEnd(10).slice(0, 10) +
        dateStringToYymmdd(entry.issueDate) +
        entry.ticketNumber.padEnd(23).slice(0, 23) +
        authorizedUserPadded +
        NEWLINE
    }

    const recordCountPadded = this.#batchEntries.length
      .toString()
      .padStart(6, '0')
      .slice(-6)

    /*
     * HEADER ROW
     * ----------
     * Record Id    | 4 characters           | "PKTA"
     * Unknown      | 5 characters           | "    1"
     * Export Date  | 6 numbers              | YYMMDD
     * Record Count | 6 numbers, zero padded | 000201
     * RET-TAPE     | 1 character, Y or N    | Y
     * CERT-LABEL   | 1 character, Y or N    | N
     */

    output =
      'PKTA' +
      '    1' +
      dateStringToYymmdd(this.#config.sentDate) +
      recordCountPadded +
      'Y' +
      (this.#config.includeLabels ? 'Y' : 'N') +
      NEWLINE +
      output

    /*
     * FOOTER ROW
     * ----------
     * Record Id    | 4 characters           | "PKTZ"
     * Record Count | 6 numbers, zero padded | 000201
     */

    output += 'PKTZ' + recordCountPadded + NEWLINE

    return output
  }
}