import std/sequtils
import std/tables
import std/hashes
import std/sets
import std/sugar
import pkg/questionable
import pkg/codex/market
import pkg/codex/contracts/requests
import pkg/codex/contracts/proofs
import pkg/codex/contracts/config
import ../examples

export market
export tables

type
  MockMarket* = ref object of Market
    periodicity: Periodicity
    activeRequests*: Table[Address, seq[RequestId]]
    activeSlots*: Table[Address, seq[SlotId]]
    requested*: seq[StorageRequest]
    requestEnds*: Table[RequestId, SecondsSince1970]
    requestExpiry*: Table[RequestId, SecondsSince1970]
    requestState*: Table[RequestId, RequestState]
    slotState*: Table[SlotId, SlotState]
    fulfilled*: seq[Fulfillment]
    filled*: seq[MockSlot]
    freed*: seq[SlotId]
    submitted*: seq[Groth16Proof]
    markedAsMissingProofs*: seq[SlotId]
    canBeMarkedAsMissing: HashSet[SlotId]
    withdrawn*: seq[RequestId]
    proofPointer*: uint8
    proofsRequired: HashSet[SlotId]
    proofsToBeRequired: HashSet[SlotId]
    proofChallenge*: ProofChallenge
    proofEnds: Table[SlotId, UInt256]
    signer: Address
    subscriptions: Subscriptions
    config*: MarketplaceConfig
  Fulfillment* = object
    requestId*: RequestId
    proof*: Groth16Proof
    host*: Address
  MockSlot* = object
    requestId*: RequestId
    host*: Address
    slotIndex*: UInt256
    proof*: Groth16Proof
  Subscriptions = object
    onRequest: seq[RequestSubscription]
    onFulfillment: seq[FulfillmentSubscription]
    onSlotFilled: seq[SlotFilledSubscription]
    onSlotFreed: seq[SlotFreedSubscription]
    onRequestCancelled: seq[RequestCancelledSubscription]
    onRequestFailed: seq[RequestFailedSubscription]
    onProofSubmitted: seq[ProofSubmittedSubscription]
  RequestSubscription* = ref object of Subscription
    market: MockMarket
    callback: OnRequest
  FulfillmentSubscription* = ref object of Subscription
    market: MockMarket
    requestId: ?RequestId
    callback: OnFulfillment
  SlotFilledSubscription* = ref object of Subscription
    market: MockMarket
    requestId: ?RequestId
    slotIndex: ?UInt256
    callback: OnSlotFilled
  SlotFreedSubscription* = ref object of Subscription
    market: MockMarket
    callback: OnSlotFreed
  RequestCancelledSubscription* = ref object of Subscription
    market: MockMarket
    requestId: ?RequestId
    callback: OnRequestCancelled
  RequestFailedSubscription* = ref object of Subscription
    market: MockMarket
    requestId: ?RequestId
    callback: OnRequestCancelled
  ProofSubmittedSubscription = ref object of Subscription
    market: MockMarket
    callback: OnProofSubmitted

proc hash*(address: Address): Hash =
  hash(address.toArray)

proc hash*(requestId: RequestId): Hash =
  hash(requestId.toArray)

proc new*(_: type MockMarket): MockMarket =
  ## Create a new mocked Market instance
  ##
  let config = MarketplaceConfig(
    collateral: CollateralConfig(
      repairRewardPercentage: 10,
      maxNumberOfSlashes: 5,
      slashCriterion: 3,
      slashPercentage: 10
    ),
    proofs: ProofConfig(
      period: 10.u256,
      timeout: 5.u256,
      downtime: 64.uint8
    )
  )
  MockMarket(signer: Address.example, config: config)

method getSigner*(market: MockMarket): Future[Address] {.async.} =
  return market.signer

method periodicity*(mock: MockMarket): Future[Periodicity] {.async.} =
  return Periodicity(seconds: mock.config.proofs.period)

method proofTimeout*(market: MockMarket): Future[UInt256] {.async.} =
  return market.config.proofs.timeout

method proofDowntime*(market: MockMarket): Future[uint8] {.async.} =
  return market.config.proofs.downtime

method getPointer*(market: MockMarket, slotId: SlotId): Future[uint8] {.async.} =
  return market.proofPointer

method requestStorage*(market: MockMarket, request: StorageRequest) {.async.} =
  market.requested.add(request)
  var subscriptions = market.subscriptions.onRequest
  for subscription in subscriptions:
    subscription.callback(request.id,
                          request.ask,
                          request.expiry)

method myRequests*(market: MockMarket): Future[seq[RequestId]] {.async.} =
  return market.activeRequests[market.signer]

method mySlots*(market: MockMarket): Future[seq[SlotId]] {.async.} =
  return market.activeSlots[market.signer]

method getRequest(market: MockMarket,
                  id: RequestId): Future[?StorageRequest] {.async.} =
  for request in market.requested:
    if request.id == id:
      return some request
  return none StorageRequest

method getActiveSlot*(
  market: MockMarket,
  slotId: SlotId): Future[?Slot] {.async.} =

  for slot in market.filled:
    if slotId(slot.requestId, slot.slotIndex) == slotId and
      request =? await market.getRequest(slot.requestId):
      return some Slot(request: request, slotIndex: slot.slotIndex)
  return none Slot

method requestState*(market: MockMarket,
                     requestId: RequestId): Future[?RequestState] {.async.} =
  return market.requestState.?[requestId]

method slotState*(market: MockMarket,
                  slotId: SlotId): Future[SlotState] {.async.} =
  if not market.slotState.hasKey(slotId):
    return SlotState.Free
  return market.slotState[slotId]

method getRequestEnd*(market: MockMarket,
                      id: RequestId): Future[SecondsSince1970] {.async.} =
  return market.requestEnds[id]

method requestExpiresAt*(market: MockMarket,
                      id: RequestId): Future[SecondsSince1970] {.async.} =
  return market.requestExpiry[id]

method getHost*(market: MockMarket,
               requestId: RequestId,
               slotIndex: UInt256): Future[?Address] {.async.} =
  for slot in market.filled:
    if slot.requestId == requestId and slot.slotIndex == slotIndex:
      return some slot.host
  return none Address

proc emitSlotFilled*(market: MockMarket,
                     requestId: RequestId,
                     slotIndex: UInt256) =
  var subscriptions = market.subscriptions.onSlotFilled
  for subscription in subscriptions:
    let requestMatches =
      subscription.requestId.isNone or
      subscription.requestId == some requestId
    let slotMatches =
      subscription.slotIndex.isNone or
      subscription.slotIndex == some slotIndex
    if requestMatches and slotMatches:
      subscription.callback(requestId, slotIndex)

proc emitSlotFreed*(market: MockMarket,
                    requestId: RequestId,
                    slotIndex: UInt256) =
  var subscriptions = market.subscriptions.onSlotFreed
  for subscription in subscriptions:
    subscription.callback(requestId, slotIndex)

proc emitRequestCancelled*(market: MockMarket, requestId: RequestId) =
  var subscriptions = market.subscriptions.onRequestCancelled
  for subscription in subscriptions:
    if subscription.requestId == requestId.some or
       subscription.requestId.isNone:
      subscription.callback(requestId)

proc emitRequestFulfilled*(market: MockMarket, requestId: RequestId) =
  var subscriptions = market.subscriptions.onFulfillment
  for subscription in subscriptions:
    if subscription.requestId == requestId.some or
       subscription.requestId.isNone:
      subscription.callback(requestId)

proc emitRequestFailed*(market: MockMarket, requestId: RequestId) =
  var subscriptions = market.subscriptions.onRequestFailed
  for subscription in subscriptions:
    if subscription.requestId == requestId.some or
       subscription.requestId.isNone:
      subscription.callback(requestId)

proc fillSlot*(market: MockMarket,
               requestId: RequestId,
               slotIndex: UInt256,
               proof: Groth16Proof,
               host: Address) =
  let slot = MockSlot(
    requestId: requestId,
    slotIndex: slotIndex,
    proof: proof,
    host: host
  )
  market.filled.add(slot)
  market.slotState[slotId(slot.requestId, slot.slotIndex)] = SlotState.Filled
  market.emitSlotFilled(requestId, slotIndex)

method fillSlot*(market: MockMarket,
                 requestId: RequestId,
                 slotIndex: UInt256,
                 proof: Groth16Proof,
                 collateral: UInt256) {.async.} =
  market.fillSlot(requestId, slotIndex, proof, market.signer)

method freeSlot*(market: MockMarket, slotId: SlotId) {.async.} =
  market.freed.add(slotId)
  for s in market.filled:
    if slotId(s.requestId, s.slotIndex) == slotId:
      market.emitSlotFreed(s.requestId, s.slotIndex)
      break
  market.slotState[slotId] = SlotState.Free

method withdrawFunds*(market: MockMarket,
                      requestId: RequestId) {.async.} =
  market.withdrawn.add(requestId)
  market.emitRequestCancelled(requestId)

proc setProofRequired*(mock: MockMarket, id: SlotId, required: bool) =
  if required:
    mock.proofsRequired.incl(id)
  else:
    mock.proofsRequired.excl(id)

method isProofRequired*(mock: MockMarket,
                        id: SlotId): Future[bool] {.async.} =
  return mock.proofsRequired.contains(id)

proc setProofToBeRequired*(mock: MockMarket, id: SlotId, required: bool) =
  if required:
    mock.proofsToBeRequired.incl(id)
  else:
    mock.proofsToBeRequired.excl(id)

method willProofBeRequired*(mock: MockMarket,
                            id: SlotId): Future[bool] {.async.} =
  return mock.proofsToBeRequired.contains(id)

method getChallenge*(mock: MockMarket, id: SlotId): Future[ProofChallenge] {.async.} =
  return mock.proofChallenge

proc setProofEnd*(mock: MockMarket, id: SlotId, proofEnd: UInt256) =
  mock.proofEnds[id] = proofEnd

method submitProof*(mock: MockMarket, id: SlotId, proof: Groth16Proof) {.async.} =
  mock.submitted.add(proof)
  for subscription in mock.subscriptions.onProofSubmitted:
    subscription.callback(id)

method markProofAsMissing*(market: MockMarket,
                           id: SlotId,
                           period: Period) {.async.} =
  market.markedAsMissingProofs.add(id)

proc setCanProofBeMarkedAsMissing*(mock: MockMarket, id: SlotId, required: bool) =
  if required:
    mock.canBeMarkedAsMissing.incl(id)
  else:
    mock.canBeMarkedAsMissing.excl(id)

method canProofBeMarkedAsMissing*(market: MockMarket,
                                  id: SlotId,
                                  period: Period): Future[bool] {.async.} =
  return market.canBeMarkedAsMissing.contains(id)

method subscribeRequests*(market: MockMarket,
                          callback: OnRequest):
                         Future[Subscription] {.async.} =
  let subscription = RequestSubscription(
    market: market,
    callback: callback
  )
  market.subscriptions.onRequest.add(subscription)
  return subscription

method subscribeFulfillment*(market: MockMarket,
                             callback: OnFulfillment):
                            Future[Subscription] {.async.} =
  let subscription = FulfillmentSubscription(
    market: market,
    requestId: none RequestId,
    callback: callback
  )
  market.subscriptions.onFulfillment.add(subscription)
  return subscription

method subscribeFulfillment*(market: MockMarket,
                             requestId: RequestId,
                             callback: OnFulfillment):
                            Future[Subscription] {.async.} =
  let subscription = FulfillmentSubscription(
    market: market,
    requestId: some requestId,
    callback: callback
  )
  market.subscriptions.onFulfillment.add(subscription)
  return subscription

method subscribeSlotFilled*(market: MockMarket,
                            callback: OnSlotFilled):
                           Future[Subscription] {.async.} =
  let subscription = SlotFilledSubscription(market: market, callback: callback)
  market.subscriptions.onSlotFilled.add(subscription)
  return subscription

method subscribeSlotFilled*(market: MockMarket,
                            requestId: RequestId,
                            slotIndex: UInt256,
                            callback: OnSlotFilled):
                           Future[Subscription] {.async.} =
  let subscription = SlotFilledSubscription(
    market: market,
    requestId: some requestId,
    slotIndex: some slotIndex,
    callback: callback
  )
  market.subscriptions.onSlotFilled.add(subscription)
  return subscription

method subscribeSlotFreed*(market: MockMarket,
                           callback: OnSlotFreed):
                          Future[Subscription] {.async.} =
  let subscription = SlotFreedSubscription(market: market, callback: callback)
  market.subscriptions.onSlotFreed.add(subscription)
  return subscription

method subscribeRequestCancelled*(market: MockMarket,
                                  callback: OnRequestCancelled):
                                 Future[Subscription] {.async.} =
  let subscription = RequestCancelledSubscription(
    market: market,
    requestId: none RequestId,
    callback: callback
  )
  market.subscriptions.onRequestCancelled.add(subscription)
  return subscription

method subscribeRequestCancelled*(market: MockMarket,
                                  requestId: RequestId,
                                  callback: OnRequestCancelled):
                                 Future[Subscription] {.async.} =
  let subscription = RequestCancelledSubscription(
    market: market,
    requestId: some requestId,
    callback: callback
  )
  market.subscriptions.onRequestCancelled.add(subscription)
  return subscription

method subscribeRequestFailed*(market: MockMarket,
                               callback: OnRequestFailed):
                             Future[Subscription] {.async.} =
  let subscription = RequestFailedSubscription(
    market: market,
    requestId: none RequestId,
    callback: callback
  )
  market.subscriptions.onRequestFailed.add(subscription)
  return subscription

method subscribeRequestFailed*(market: MockMarket,
                               requestId: RequestId,
                               callback: OnRequestFailed):
                             Future[Subscription] {.async.} =
  let subscription = RequestFailedSubscription(
    market: market,
    requestId: some requestId,
    callback: callback
  )
  market.subscriptions.onRequestFailed.add(subscription)
  return subscription

method subscribeProofSubmission*(mock: MockMarket,
                                 callback: OnProofSubmitted):
                                Future[Subscription] {.async.} =
  let subscription = ProofSubmittedSubscription(
    market: mock,
    callback: callback
  )
  mock.subscriptions.onProofSubmitted.add(subscription)
  return subscription

method queryPastStorageRequests*(market: MockMarket,
                                 blocksAgo: int):
                                Future[seq[PastStorageRequest]] {.async.} =
  # MockMarket does not have the concept of blocks, so simply return all
  # previous events
  return market.requested.map(request =>
    PastStorageRequest(requestId: request.id,
                       ask: request.ask,
                       expiry: request.expiry)
  )

method unsubscribe*(subscription: RequestSubscription) {.async.} =
  subscription.market.subscriptions.onRequest.keepItIf(it != subscription)

method unsubscribe*(subscription: FulfillmentSubscription) {.async.} =
  subscription.market.subscriptions.onFulfillment.keepItIf(it != subscription)

method unsubscribe*(subscription: SlotFilledSubscription) {.async.} =
  subscription.market.subscriptions.onSlotFilled.keepItIf(it != subscription)

method unsubscribe*(subscription: SlotFreedSubscription) {.async.} =
  subscription.market.subscriptions.onSlotFreed.keepItIf(it != subscription)

method unsubscribe*(subscription: RequestCancelledSubscription) {.async.} =
  subscription.market.subscriptions.onRequestCancelled.keepItIf(it != subscription)

method unsubscribe*(subscription: RequestFailedSubscription) {.async.} =
  subscription.market.subscriptions.onRequestFailed.keepItIf(it != subscription)

method unsubscribe*(subscription: ProofSubmittedSubscription) {.async.} =
  subscription.market.subscriptions.onProofSubmitted.keepItIf(it != subscription)