# Nimbus
# Copyright (c) 2021 Status Research & Development GmbH
# Licensed and distributed under either of
#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.

{.used.}

import
  unittest2, stint,
  ../network/state/state_content,
  ../content_db

proc genByteSeq(length: int): seq[byte] = 
  var i = 0
  var resultSeq = newSeq[byte](length)
  while i < length:
    resultSeq[i] = byte(i)
    inc i
  return resultSeq

suite "Content Database":
  # Note: We are currently not really testing something new here just basic
  # underlying kvstore.
  test "ContentDB basic API":
    let
      db = ContentDB.new("", inMemory = true)
      key = ContentId(UInt256.high()) # Some key

    block:
      let val = db.get(key)

      check:
        val.isNone()
        db.contains(key) == false

    block:
      db.put(key, [byte 0, 1, 2, 3])
      let val = db.get(key)

      check:
        val.isSome()
        val.get() == [byte 0, 1, 2, 3]
        db.contains(key) == true

    block:
      db.del(key)
      let val = db.get(key)

      check:
        val.isNone()
        db.contains(key) == false

  test "ContentDB size":
    let
      db = ContentDB.new("", inMemory = true)

    let numBytes = 10000
    let size1 = db.size()
    db.put(@[1'u8], genByteSeq(numBytes))
    let size2 = db.size()
    db.put(@[2'u8], genByteSeq(numBytes))
    let size3 = db.size()
    db.put(@[2'u8], genByteSeq(numBytes))
    let size4 = db.size()

    check:
      size2 > size1
      size3 > size2
      size3 == size4

    db.del(@[2'u8])
    db.del(@[1'u8])
    
    let size5 = db.size()
    
    check:
      size4 == size5

    db.reclaimSpace()

    let size6 = db.size()

    check:
      # After space reclamation size of db should be equal to initial size
      size6 == size1