// errorcheck

// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Test various correct and incorrect permutations of send-only,
// receive-only, and bidirectional channels.

'use strict'

const assert = require(`@nodeguy/assert`)
const Channel = require('../../lib')

it(`perm`, function () {
  const c = Channel()
  const cr = Channel().readOnly()
  const cs = Channel().writeOnly()

  const n = 0

  assert.throws(() => {
    Channel.shift(n) // ERROR "receive from non-chan"
  })

  assert.throws(() => {
    Channel.push(2, n) // ERROR "send to non-chan"
  })

  c.push(0) // ok
  c.shift() // ok

  assert.throws(() => {
    cr.push(0) // ERROR "send"
  })

  cr.shift() // ok

  cs.push(0) // ok

  assert.throws(() => {
    cs.shift() // ERROR "receive"
  })

  Channel.select(
    c.push(0), // ok
    c.shift()  // ok
  )

  assert.throws(() => {
    Channel.select(
      cr.push(0) // ERROR "send"
    )
  })

  Channel.select(cr.shift()) // ok

  Channel.select(cs.push(0)) // ok

  assert.throws(() => {
    Channel.select(cs.shift()) // ERROR "receive"
  })

  assert.throws(() => {
    cs.forEach(() => {}) // ERROR "receive"
  })

  c.close()
  cs.close()

  assert.throws(() => {
    cr.close() // ERROR "receive"
  })

  assert.throws(() => {
    Channel.close(n) // ERROR "invalid operation.*non-chan type"
  })
})