{.used.}

import unittest2
import chronos/timer
import ../../libp2p/protocols/pubsub/timedcache

suite "TimedCache":
  test "put/get":
    var cache = TimedCache[int].init(5.seconds)

    let now = Moment.now()
    check:
      not cache.put(1, now)
      not cache.put(2, now + 3.seconds)

    check:
      1 in cache
      2 in cache

    check:
      not cache.put(3, now + 6.seconds)
      # expires 1

    check:
      1 notin cache
      2 in cache
      3 in cache

      cache.addedAt(2) == now + 3.seconds

    check:
      cache.put(2, now + 7.seconds) # refreshes 2
      not cache.put(4, now + 12.seconds) # expires 3

    check:
      2 in cache
      3 notin cache
      4 in cache

    check:
      cache.del(4).isSome()
      4 notin cache

    check:
      not cache.put(100, now + 100.seconds) # expires everything
      100 in cache
      2 notin cache

  test "enough items to force cache heap storage growth":
    var cache = TimedCache[int].init(5.seconds)

    let now = Moment.now()
    for i in 101 .. 100000:
      check:
        not cache.put(i, now)

    for i in 101 .. 100000:
      check:
        i in cache

  test "max size constraint":
    var cache = TimedCache[int].init(5.seconds, 3) # maxSize = 3

    let now = Moment.now()
    check:
      not cache.put(1, now)
      not cache.put(2, now + 1.seconds)
      not cache.put(3, now + 2.seconds)

    check:
      1 in cache
      2 in cache
      3 in cache

    check:
      not cache.put(4, now + 3.seconds) # exceeds maxSize, evicts 1

    check:
      1 notin cache
      2 in cache
      3 in cache
      4 in cache

    check:
      not cache.put(5, now + 4.seconds) # exceeds maxSize, evicts 2

    check:
      1 notin cache
      2 notin cache
      3 in cache
      4 in cache
      5 in cache

    check:
      not cache.put(6, now + 5.seconds) # exceeds maxSize, evicts 3

    check:
      1 notin cache
      2 notin cache
      3 notin cache
      4 in cache
      5 in cache
      6 in cache

  test "max size with expiration":
    var cache = TimedCache[int].init(3.seconds, 2) # maxSize = 2

    let now = Moment.now()
    check:
      not cache.put(1, now)
      not cache.put(2, now + 1.seconds)

    check:
      1 in cache
      2 in cache

    check:
      not cache.put(3, now + 5.seconds) # expires 1 and 2, should only contain 3

    check:
      1 notin cache
      2 notin cache
      3 in cache

  test "max size constraint with refresh":
    var cache = TimedCache[int].init(5.seconds, 3) # maxSize = 3

    let now = Moment.now()
    check:
      not cache.put(1, now)
      not cache.put(2, now + 1.seconds)
      not cache.put(3, now + 2.seconds)

    check:
      1 in cache
      2 in cache
      3 in cache

    check:
      cache.put(1, now + 3.seconds) # refreshes 1, now 2 is the oldest

    check:
      not cache.put(4, now + 3.seconds) # exceeds maxSize, evicts 2

    check:
      1 in cache
      2 notin cache
      3 in cache
      4 in cache