import std/os
import std/strutils
import std/sequtils

import pkg/questionable
import pkg/questionable/results

import pkg/chronos
import pkg/asynctest
import pkg/libp2p
import pkg/stew/byteutils
import pkg/stew/endians2
import pkg/datastore

import pkg/codex/stores/cachestore
import pkg/codex/chunker
import pkg/codex/stores
import pkg/codex/blocktype as bt
import pkg/codex/clock

import ../helpers
import ../helpers/mockclock
import ./commonstoretests

proc createTestBlock(size: int): bt.Block =
  bt.Block.new('a'.repeat(size).toBytes).tryGet()

suite "MemoryStore":
  var
    initialBlock: bt.Block

    repo: MemoryStore

  let
    capacity = 100
    chunkSize = 10

  setup:
    initialBlock = createTestBlock(chunkSize)

    repo = MemoryStore.new([initialBlock], capacity, chunkSize)

  # teardown:
  #   discard

  # test "Should update current used bytes on block put":
  #   let blk = createTestBlock(200)

  #   check repo.quotaUsedBytes == 0
  #   (await repo.putBlock(blk)).tryGet

  #   check:
  #     repo.quotaUsedBytes == 200
  #     uint64.fromBytesBE((await metaDs.get(QuotaUsedKey)).tryGet) == 200'u

  # test "Should update current used bytes on block delete":
  #   let blk = createTestBlock(100)

  #   check repo.quotaUsedBytes == 0
  #   (await repo.putBlock(blk)).tryGet
  #   check repo.quotaUsedBytes == 100

  #   (await repo.delBlock(blk.cid)).tryGet

  #   check:
  #     repo.quotaUsedBytes == 0
  #     uint64.fromBytesBE((await metaDs.get(QuotaUsedKey)).tryGet) == 0'u

  # test "Should not update current used bytes if block exist":
  #   let blk = createTestBlock(100)

  #   check repo.quotaUsedBytes == 0
  #   (await repo.putBlock(blk)).tryGet
  #   check repo.quotaUsedBytes == 100

  #   # put again
  #   (await repo.putBlock(blk)).tryGet
  #   check repo.quotaUsedBytes == 100

  #   check:
  #     uint64.fromBytesBE((await metaDs.get(QuotaUsedKey)).tryGet) == 100'u

  # test "Should fail storing passed the quota":
  #   let blk = createTestBlock(300)

  #   check repo.totalUsed == 0
  #   expect QuotaUsedError:
  #     (await repo.putBlock(blk)).tryGet

  # test "Should reserve bytes":
  #   let blk = createTestBlock(100)

  #   check repo.totalUsed == 0
  #   (await repo.putBlock(blk)).tryGet
  #   check repo.totalUsed == 100

  #   (await repo.reserve(100)).tryGet

  #   check:
  #     repo.totalUsed == 200
  #     repo.quotaUsedBytes == 100
  #     repo.quotaReservedBytes == 100
  #     uint64.fromBytesBE((await metaDs.get(QuotaReservedKey)).tryGet) == 100'u

  # test "Should not reserve bytes over max quota":
  #   let blk = createTestBlock(100)

  #   check repo.totalUsed == 0
  #   (await repo.putBlock(blk)).tryGet
  #   check repo.totalUsed == 100

  #   expect QuotaNotEnoughError:
  #     (await repo.reserve(101)).tryGet

  #   check:
  #     repo.totalUsed == 100
  #     repo.quotaUsedBytes == 100
  #     repo.quotaReservedBytes == 0

  #   expect DatastoreKeyNotFound:
  #     discard (await metaDs.get(QuotaReservedKey)).tryGet

  # test "Should release bytes":
  #   discard createTestBlock(100)

  #   check repo.totalUsed == 0
  #   (await repo.reserve(100)).tryGet
  #   check repo.totalUsed == 100

  #   (await repo.release(100)).tryGet

  #   check:
  #     repo.totalUsed == 0
  #     repo.quotaUsedBytes == 0
  #     repo.quotaReservedBytes == 0
  #     uint64.fromBytesBE((await metaDs.get(QuotaReservedKey)).tryGet) == 0'u

  # test "Should not release bytes less than quota":
  #   check repo.totalUsed == 0
  #   (await repo.reserve(100)).tryGet
  #   check repo.totalUsed == 100

  #   expect CatchableError:
  #     (await repo.release(101)).tryGet

  #   check:
  #     repo.totalUsed == 100
  #     repo.quotaUsedBytes == 0
  #     repo.quotaReservedBytes == 100
  #     uint64.fromBytesBE((await metaDs.get(QuotaReservedKey)).tryGet) == 100'u

  # proc queryMetaDs(key: Key): Future[seq[QueryResponse]] {.async.} =
  #   let
  #     query = Query.init(key)
  #     responseIter = (await metaDs.query(query)).tryGet
  #     response = (await allFinished(toSeq(responseIter)))
  #       .mapIt(it.read.tryGet)
  #       .filterIt(it.key.isSome)
  #   return response

  # test "Should store block expiration timestamp":
  #   let
  #     duration = 10.seconds
  #     blk = createTestBlock(100)

  #   let
  #     expectedExpiration: SecondsSince1970 = 123 + 10
  #     expectedKey = Key.init("meta/ttl/" & $blk.cid).tryGet

  #   (await repo.putBlock(blk, duration.some)).tryGet

  #   let response = await queryMetaDs(expectedKey)

  #   check:
  #     response.len == 1
  #     !response[0].key == expectedKey
  #     response[0].data == expectedExpiration.toBytes

  # test "Should store block with default expiration timestamp when not provided":
  #   let
  #     blk = createTestBlock(100)

  #   let
  #     expectedExpiration: SecondsSince1970 = 123 + DefaultBlockTtl.seconds
  #     expectedKey = Key.init("meta/ttl/" & $blk.cid).tryGet

  #   (await repo.putBlock(blk)).tryGet

  #   let response = await queryMetaDs(expectedKey)

  #   check:
  #     response.len == 1
  #     !response[0].key == expectedKey
  #     response[0].data == expectedExpiration.toBytes

  # test "delBlock should remove expiration metadata":
  #   let
  #     blk = createTestBlock(100)
  #     expectedKey = Key.init("meta/ttl/" & $blk.cid).tryGet

  #   (await repo.putBlock(blk, 10.seconds.some)).tryGet
  #   (await repo.delBlock(blk.cid)).tryGet

  #   let response = await queryMetaDs(expectedKey)

  #   check:
  #     response.len == 0

  # test "Should retrieve block expiration information":
  #   proc unpack(beIter: Future[?!BlockExpirationIter]): Future[seq[BlockExpiration]] {.async.} =
  #     var expirations = newSeq[BlockExpiration](0)
  #     without iter =? (await beIter), err:
  #       return expirations
  #     for be in toSeq(iter):
  #       if value =? (await be):
  #         expirations.add(value)
  #     return expirations

  #   let
  #     duration = 10.seconds
  #     blk1 = createTestBlock(10)
  #     blk2 = createTestBlock(11)
  #     blk3 = createTestBlock(12)

  #   let
  #     expectedExpiration: SecondsSince1970 = 123 + 10

  #   proc assertExpiration(be: BlockExpiration, expectedBlock: bt.Block) =
  #     check:
  #       be.cid == expectedBlock.cid
  #       be.expiration == expectedExpiration


  #   (await repo.putBlock(blk1, duration.some)).tryGet
  #   (await repo.putBlock(blk2, duration.some)).tryGet
  #   (await repo.putBlock(blk3, duration.some)).tryGet

  #   let
  #     blockExpirations1 = await unpack(repo.getBlockExpirations(maxNumber=2, offset=0))
  #     blockExpirations2 = await unpack(repo.getBlockExpirations(maxNumber=2, offset=2))

  #   check blockExpirations1.len == 2
  #   assertExpiration(blockExpirations1[0], blk2)
  #   assertExpiration(blockExpirations1[1], blk1)

  #   check blockExpirations2.len == 1
  #   assertExpiration(blockExpirations2[0], blk3)

commonBlockStoreTests(
  "MemoryStore", proc: BlockStore =
    MemoryStore.new([])
)