{.used.}

import
  std/sequtils,
  stew/results,
  testutils/unittests,
  chronos
import
  ../../../waku/common/sqlite,
  ../../../waku/v2/waku_archive,
  ../../../waku/v2/waku_archive/driver/sqlite_driver,
  ../../../waku/v2/waku_archive/retention_policy,
  ../../../waku/v2/waku_archive/retention_policy/retention_policy_capacity,
  ../../../waku/v2/waku_core,
  ../../../waku/v2/utils/time,
  ../testlib/common,
  ../testlib/wakucore


proc newTestDatabase(): SqliteDatabase =
  SqliteDatabase.new(":memory:").tryGet()

proc newTestArchiveDriver(): ArchiveDriver =
  let db = newTestDatabase()
  SqliteDriver.new(db).tryGet()


suite "Waku Archive - Retention policy":

  test "capacity retention policy - windowed message deletion":
    ## Given
    let
      capacity = 100
      excess = 65

    let driver = newTestArchiveDriver()

    let retentionPolicy: RetentionPolicy = CapacityRetentionPolicy.init(capacity=capacity)

    ## When
    for i in 1..capacity+excess:
      let msg = fakeWakuMessage(payload= @[byte i], contentTopic=DefaultContentTopic, ts=Timestamp(i))

      require driver.put(DefaultPubsubTopic, msg, computeDigest(msg), msg.timestamp).isOk()
      require retentionPolicy.execute(driver).isOk()

    ## Then
    let numMessages = driver.getMessagesCount().tryGet()
    check:
      # Expected number of messages is 120 because
      # (capacity = 100) + (half of the overflow window = 15) + (5 messages added after after the last delete)
      # the window size changes when changing `const maxStoreOverflow = 1.3 in sqlite_store
      numMessages == 120

    ## Cleanup
    driver.close().expect("driver to close")

  test "store capacity should be limited":
    ## Given
    const capacity = 5
    const contentTopic = "test-content-topic"

    let
      driver = newTestArchiveDriver()
      retentionPolicy: RetentionPolicy = CapacityRetentionPolicy.init(capacity=capacity)

    let messages = @[
      fakeWakuMessage(contentTopic=DefaultContentTopic, ts=ts(0)),
      fakeWakuMessage(contentTopic=DefaultContentTopic, ts=ts(1)),

      fakeWakuMessage(contentTopic=contentTopic, ts=ts(2)),
      fakeWakuMessage(contentTopic=contentTopic, ts=ts(3)),
      fakeWakuMessage(contentTopic=contentTopic, ts=ts(4)),
      fakeWakuMessage(contentTopic=contentTopic, ts=ts(5)),
      fakeWakuMessage(contentTopic=contentTopic, ts=ts(6))
    ]

    ## When
    for msg in messages:
      require driver.put(DefaultPubsubTopic, msg, computeDigest(msg), msg.timestamp).isOk()
      require retentionPolicy.execute(driver).isOk()

    ## Then
    let storedMsg = driver.getAllMessages().tryGet()
    check:
      storedMsg.len == capacity
      storedMsg.all do (item: auto) -> bool:
        let (pubsubTopic, msg, digest, storeTimestamp) = item
        msg.contentTopic == contentTopic and
        pubsubTopic == DefaultPubsubTopic

    ## Cleanup
    driver.close().expect("driver to close")