// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict'

const tap = require('tap')
const silentConsole = {
  log() {},
  error() {}
}
require('../common')
const assert = require('assert')
const { Readable, Writable } = require('../../lib/ours/index')
const EE = require('events').EventEmitter

// A mock thing a bit like the net.Socket/tcp_wrap.handle interaction

const stream = new Readable({
  highWaterMark: 16,
  encoding: 'utf8'
})
const source = new EE()
stream._read = function () {
  silentConsole.error('stream._read')
  readStart()
}
let ended = false
stream.on('end', function () {
  ended = true
})
source.on('data', function (chunk) {
  const ret = stream.push(chunk)
  silentConsole.error('data', stream.readableLength)
  if (!ret) readStop()
})
source.on('end', function () {
  stream.push(null)
})
let reading = false
function readStart() {
  silentConsole.error('readStart')
  reading = true
}
function readStop() {
  silentConsole.error('readStop')
  reading = false
  process.nextTick(function () {
    const r = stream.read()
    if (r !== null) writer.write(r)
  })
}
const writer = new Writable({
  decodeStrings: false
})
const written = []
const expectWritten = [
  'asdfgasdfgasdfgasdfg',
  'asdfgasdfgasdfgasdfg',
  'asdfgasdfgasdfgasdfg',
  'asdfgasdfgasdfgasdfg',
  'asdfgasdfgasdfgasdfg',
  'asdfgasdfgasdfgasdfg'
]
writer._write = function (chunk, encoding, cb) {
  silentConsole.error(`WRITE ${chunk}`)
  written.push(chunk)
  process.nextTick(cb)
}
writer.on('finish', finish)

// Now emit some chunks.

const chunk = 'asdfg'
let set = 0
readStart()
data()
function data() {
  assert(reading)
  source.emit('data', chunk)
  assert(reading)
  source.emit('data', chunk)
  assert(reading)
  source.emit('data', chunk)
  assert(reading)
  source.emit('data', chunk)
  assert(!reading)
  if (set++ < 5) setTimeout(data, 10)
  else end()
}
function finish() {
  silentConsole.error('finish')
  assert.deepStrictEqual(written, expectWritten)
  silentConsole.log('ok')
}
function end() {
  source.emit('end')
  assert(!reading)
  writer.end(stream.read())
  setImmediate(function () {
    assert(ended)
  })
}

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