'use strict'

/* eslint no-prototype-builtins: 0 */

const { Readable } = require('readable-stream')
const util = require('util')
const cookie = require('cookie')
const assert = require('assert')

const parseURL = require('./parseURL')

/**
 * Get hostname:port
 *
 * @param {URL} parsedURL
 * @return {String}
 */
function hostHeaderFromURL (parsedURL) {
  return parsedURL.port
    ? parsedURL.host
    : parsedURL.hostname + (parsedURL.protocol === 'https:' ? ':443' : ':80')
}

/**
 * Request
 *
 * @constructor
 * @param {Object} options
 * @param {(Object|String)} options.url || options.path
 * @param {String} [options.method='GET']
 * @param {String} [options.remoteAddress]
 * @param {Object} [options.cookies]
 * @param {Object} [options.headers]
 * @param {Object} [options.query]
 * @param {any} [options.payload]
 */
function Request (options) {
  Readable.call(this)

  const parsedURL = parseURL(options.url || options.path, options.query)

  this.url = parsedURL.pathname + parsedURL.search

  this.httpVersion = '1.1'
  this.method = options.method ? options.method.toUpperCase() : 'GET'

  this.headers = {}
  const headers = options.headers || {}
  Object.keys(headers).forEach((field) => {
    const value = headers[field]
    assert(value !== undefined, 'invalid value "undefined" for header ' + field)
    this.headers[field.toLowerCase()] = '' + value
  })

  this.headers['user-agent'] = this.headers['user-agent'] || 'lightMyRequest'
  this.headers.host = this.headers.host || options.authority || hostHeaderFromURL(parsedURL)

  if (options.cookies) {
    const { cookies } = options
    const cookieValues = Object.keys(cookies).map(key => cookie.serialize(key, cookies[key]))
    if (this.headers.cookie) {
      cookieValues.unshift(this.headers.cookie)
    }
    this.headers.cookie = cookieValues.join('; ')
  }

  this.connection = {
    remoteAddress: options.remoteAddress || '127.0.0.1'
  }

  // we keep both payload and body for compatibility reasons
  var payload = options.payload || options.body || null
  if (payload && typeof payload !== 'string' && !(typeof payload.resume === 'function') && !Buffer.isBuffer(payload)) {
    payload = JSON.stringify(payload)
    this.headers['content-type'] = this.headers['content-type'] || 'application/json'
  }

  // Set the content-length for the corresponding payload if none set
  if (payload && !(typeof payload.resume === 'function') && !this.headers.hasOwnProperty('content-length')) {
    this.headers['content-length'] = (Buffer.isBuffer(payload) ? payload.length : Buffer.byteLength(payload)).toString()
  }

  // Use _lightMyRequest namespace to avoid collision with Node
  this._lightMyRequest = {
    payload,
    isDone: false,
    simulate: options.simulate || {}
  }

  return this
}

util.inherits(Request, Readable)

Request.prototype.prepare = function (next) {
  const payload = this._lightMyRequest.payload
  if (!payload || typeof payload.resume !== 'function') { // does not quack like a stream
    return next()
  }

  const chunks = []

  payload.on('data', (chunk) => chunks.push(Buffer.from(chunk)))

  payload.on('end', () => {
    const payload = Buffer.concat(chunks)
    this.headers['content-length'] = this.headers['content-length'] || ('' + payload.length)
    this._lightMyRequest.payload = payload
    return next()
  })

  // Force to resume the stream. Needed for Stream 1
  payload.resume()
}

Request.prototype._read = function (size) {
  setImmediate(() => {
    if (this._lightMyRequest.isDone) {
      // 'end' defaults to true
      if (this._lightMyRequest.simulate.end !== false) {
        this.push(null)
      }

      return
    }

    this._lightMyRequest.isDone = true

    if (this._lightMyRequest.payload) {
      if (this._lightMyRequest.simulate.split) {
        this.push(this._lightMyRequest.payload.slice(0, 1))
        this.push(this._lightMyRequest.payload.slice(1))
      } else {
        this.push(this._lightMyRequest.payload)
      }
    }

    if (this._lightMyRequest.simulate.error) {
      this.emit('error', new Error('Simulated'))
    }

    if (this._lightMyRequest.simulate.close) {
      this.emit('close')
    }

    // 'end' defaults to true
    if (this._lightMyRequest.simulate.end !== false) {
      this.push(null)
    }
  })
}

Request.prototype.destroy = function () {}

module.exports = Request