import { LineReader } from "@dwesley/linereader"

import { PathLike } from "node:fs"
import { EOL } from "node:os"

import { LineReader } from "@dwesley/linereader"

async function main() {
  /** could be any valid path to a readable file */
  const PATH: PathLike = "/dev/stdin"

  /** the variable value below can be any valid encoding available in the `BufferEncoding` type */
  const ENCODING: BufferEncoding = "utf8"

  /** `LineReader` instance from the file specified in `PATH` variable  */
  const lineReader = LineReader.create(PATH, ENCODING)

  const output = []
  while (lineReader.hasNextLine()) {
    const line = await lineReader.nextLine()
    output.push(line)
  }
  console.log(output.join(EOL))
}

main()

const lineReader = LineReader.create("./file.txt", "utf-8")
const output = []
while (lineReader.hasNextLine()) {
  const line = await lineReader.nextLine()
  output.push(line)
}

console.log(output.join(" | "))

/** Helper function that should format the current line */
const helper = (line: string = ""): number[] => {
  return line.split(",", 1e5).map((value) => Number.parseInt(value, 10))
}

const output = []
while (lineReader.hasNextLine()) {
  /**
   * Extended nextLine method for lineReader instance
   * This nextLine method uses `helper`function as proxy for return the line content
   * Its return type is inherited from helper's return type
   */
  const numbers = await lineReader.nextLine(helper)
  output.push(numbers.join("-"))
}
console.log(output.join(EOL))

const lineReader = LineReader.create("./file.txt")

for (let i = 0; i < 2; i++) {
  const line = await lineReader.nextLine()
  else console.log(line)
}

if (lineReader.hasNextLine())
  lineReader.close()

console.log(await lineReader.nextLine()) // undefined