var test = require('tap').test
var LRU = require('../')

test('forEach', function (t) {
  var l = new LRU(5)
  var i
  for (i = 0; i < 10; i++) {
    l.set(i, i.toString(2))
  }

  i = 9
  l.forEach(function (val, key, cache) {
    t.equal(cache, l)
    t.equal(key, i)
    t.equal(val, i.toString(2))
    i -= 1
  })

  // get in order of most recently used
  l.get(6)
  l.get(8)

  var order = [ 8, 6, 9, 7, 5 ]
  i = 0

  l.forEach(function (val, key, cache) {
    var j = order[i++]
    t.equal(cache, l)
    t.equal(key, j)
    t.equal(val, j.toString(2))
  })
  t.equal(i, order.length)

  i = 0
  order.reverse()
  l.rforEach(function (val, key, cache) {
    var j = order[i++]
    t.equal(cache, l)
    t.equal(key, j)
    t.equal(val, j.toString(2))
  })
  t.equal(i, order.length)

  t.end()
})

test('keys() and values()', function (t) {
  var l = new LRU(5)
  var i
  for (i = 0; i < 10; i++) {
    l.set(i, i.toString(2))
  }

  t.similar(l.keys(), [9, 8, 7, 6, 5])
  t.similar(l.values(), ['1001', '1000', '111', '110', '101'])

  // get in order of most recently used
  l.get(6)
  l.get(8)

  t.similar(l.keys(), [8, 6, 9, 7, 5])
  t.similar(l.values(), ['1000', '110', '1001', '111', '101'])

  t.end()
})

test('all entries are iterated over', function (t) {
  var l = new LRU(5)
  var i
  for (i = 0; i < 10; i++) {
    l.set(i.toString(), i.toString(2))
  }

  i = 0
  l.forEach(function (val, key, cache) {
    if (i > 0) {
      cache.del(key)
    }
    i += 1
  })

  t.equal(i, 5)
  t.equal(l.keys().length, 1)

  t.end()
})

test('all stale entries are removed', function (t) {
  var l = new LRU({ max: 5, maxAge: -5, stale: true })
  var i
  for (i = 0; i < 10; i++) {
    l.set(i.toString(), i.toString(2))
  }

  i = 0
  l.forEach(function () {
    i += 1
  })

  t.equal(i, 5)
  t.equal(l.keys().length, 0)

  t.end()
})

test('expires', function (t) {
  var l = new LRU({
    max: 10,
    maxAge: 50
  })
  var i
  for (i = 0; i < 10; i++) {
    l.set(i.toString(), i.toString(2), ((i % 2) ? 25 : undefined))
  }

  i = 0
  var order = [ 8, 6, 4, 2, 0 ]
  setTimeout(function () {
    l.forEach(function (val, key, cache) {
      var j = order[i++]
      t.equal(cache, l)
      t.equal(key, j.toString())
      t.equal(val, j.toString(2))
    })
    t.equal(i, order.length)

    setTimeout(function () {
      var count = 0
      l.forEach(function (val, key, cache) { count++ })
      t.equal(0, count)
      t.end()
    }, 25)
  }, 26)
})