'use strict'

const tap = require('tap')
const silentConsole = {
  log() {},
  error() {}
}
const common = require('../common')
const assert = require('assert')
const fs = require('fs')
const rl = require('readline')
const fixtures = require('../common/fixtures')
const BOM = '\uFEFF'

// Get the data using a non-stream way to compare with the streamed data.
const modelData = fixtures.readSync('file-to-read-without-bom.txt', 'utf8')
const modelDataFirstCharacter = modelData[0]

// Detect the number of forthcoming 'line' events for mustCall() 'expected' arg.
const lineCount = modelData.match(/\n/g).length

// Ensure both without-bom and with-bom test files are textwise equal.
assert.strictEqual(fixtures.readSync('file-to-read-with-bom.txt', 'utf8'), `${BOM}${modelData}`)

// An unjustified BOM stripping with a non-BOM character unshifted to a stream.
const inputWithoutBOM = fs.createReadStream(fixtures.path('file-to-read-without-bom.txt'), 'utf8')
inputWithoutBOM.once(
  'readable',
  common.mustCall(() => {
    const maybeBOM = inputWithoutBOM.read(1)
    assert.strictEqual(maybeBOM, modelDataFirstCharacter)
    assert.notStrictEqual(maybeBOM, BOM)
    inputWithoutBOM.unshift(maybeBOM)
    let streamedData = ''
    rl.createInterface({
      input: inputWithoutBOM
    })
      .on(
        'line',
        common.mustCall((line) => {
          streamedData += `${line}\n`
        }, lineCount)
      )
      .on(
        'close',
        common.mustCall(() => {
          assert.strictEqual(streamedData, process.platform === 'win32' ? modelData.replace(/\r\n/g, '\n') : modelData)
        })
      )
  })
)

// A justified BOM stripping.
const inputWithBOM = fs.createReadStream(fixtures.path('file-to-read-with-bom.txt'), 'utf8')
inputWithBOM.once(
  'readable',
  common.mustCall(() => {
    const maybeBOM = inputWithBOM.read(1)
    assert.strictEqual(maybeBOM, BOM)
    let streamedData = ''
    rl.createInterface({
      input: inputWithBOM
    })
      .on(
        'line',
        common.mustCall((line) => {
          streamedData += `${line}\n`
        }, lineCount)
      )
      .on(
        'close',
        common.mustCall(() => {
          assert.strictEqual(streamedData, process.platform === 'win32' ? modelData.replace(/\r\n/g, '\n') : modelData)
        })
      )
  })
)

/* replacement start */
process.on('beforeExit', (code) => {
  if (code === 0) {
    tap.pass('test succeeded')
  } else {
    tap.fail(`test failed - exited code ${code}`)
  }
})
/* replacement end */
