'use strict'

const assert = require('assert')
const { inspect } = require('bare-node-util')

// Only use this for integers! Decimal numbers do not work with this function.
function addNumericalSeparator(val) {
  let res = ''
  let i = val.length
  const start = val[0] === '-' ? 1 : 0
  for (; i >= start + 4; i -= 3) res = `_${val.slice(i - 3, i)}${res}`
  return `${val.slice(0, i)}${res}`
}

function oneOf(expected, thing) {
  assert(typeof thing === 'string', '`thing` has to be of type string')
  if (Array.isArray(expected)) {
    const len = expected.length
    assert(len > 0, 'At least one expected value needs to be specified')
    expected = expected.map((i) => String(i))
    if (len > 2) {
      return `one of ${thing} ${expected.slice(0, len - 1).join(', ')}, or ` + expected[len - 1]
    } else if (len === 2) {
      return `one of ${thing} ${expected[0]} or ${expected[1]}`
    }
    return `of ${thing} ${expected[0]}`
  }
  return `of ${thing} ${String(expected)}`
}

exports.ERR_INTERNAL_ASSERTION = class ERR_INTERNAL_ASSERTION extends Error {
  constructor(message) {
    super()
    Error.captureStackTrace(this, ERR_INTERNAL_ASSERTION)

    const suffix =
      'This is caused by either a bug in ssh2 ' +
      'or incorrect usage of ssh2 internals.\n' +
      'Please open an issue with this stack trace at ' +
      'https://github.com/mscdex/ssh2/issues\n'

    this.message = message === undefined ? suffix : `${message}\n${suffix}`
  }
}

const MAX_32BIT_INT = 2 ** 32
const MAX_32BIT_BIGINT = (() => {
  try {
    return new Function('return 2n ** 32n')()
  } catch {}
})()
exports.ERR_OUT_OF_RANGE = class ERR_OUT_OF_RANGE extends RangeError {
  constructor(str, range, input, replaceDefaultBoolean) {
    super()
    Error.captureStackTrace(this, ERR_OUT_OF_RANGE)

    assert(range, 'Missing "range" argument')
    let msg = replaceDefaultBoolean ? str : `The value of "${str}" is out of range.`
    let received
    if (Number.isInteger(input) && Math.abs(input) > MAX_32BIT_INT) {
      received = addNumericalSeparator(String(input))
    } else if (typeof input === 'bigint') {
      received = String(input)
      if (input > MAX_32BIT_BIGINT || input < -MAX_32BIT_BIGINT)
        received = addNumericalSeparator(received)
      received += 'n'
    } else {
      received = inspect(input)
    }
    msg += ` It must be ${range}. Received ${received}`

    this.message = msg
  }
}

class ERR_INVALID_ARG_TYPE extends TypeError {
  constructor(name, expected, actual) {
    super()
    Error.captureStackTrace(this, ERR_INVALID_ARG_TYPE)

    assert(typeof name === 'string', `'name' must be a string`)

    // determiner: 'must be' or 'must not be'
    let determiner
    if (typeof expected === 'string' && expected.startsWith('not ')) {
      determiner = 'must not be'
      expected = expected.replace(/^not /, '')
    } else {
      determiner = 'must be'
    }

    let msg
    if (name.endsWith(' argument')) {
      // For cases like 'first argument'
      msg = `The ${name} ${determiner} ${oneOf(expected, 'type')}`
    } else {
      const type = name.includes('.') ? 'property' : 'argument'
      msg = `The "${name}" ${type} ${determiner} ${oneOf(expected, 'type')}`
    }

    msg += `. Received type ${typeof actual}`

    this.message = msg
  }
}
exports.ERR_INVALID_ARG_TYPE = ERR_INVALID_ARG_TYPE

exports.validateNumber = function validateNumber(value, name) {
  if (typeof value !== 'number') throw new ERR_INVALID_ARG_TYPE(name, 'number', value)
}