"NFT transactional state"
union TransactionalStatus =
    TransactionalStatusIdle
  | TransactionalStatusInitiatedOfferToMember
  | TransactionalStatusBuyNow
  | TransactionalStatusAuction

"Represents TransactionalStatus Idle"
type TransactionalStatusIdle {
  phantom: Int
}

"Represents TransactionalStatus InitiatedOfferToMember"
type TransactionalStatusInitiatedOfferToMember {
  "Member that recieved the offer"
  member: Membership!

  "The price that the member should pay to accept offer (optional)"
  price: BigInt
}

"Represents TransactionalStatus BuyNow"
type TransactionalStatusBuyNow {
  price: BigInt!
}

"Represents TransactionalStatus Auction"
type TransactionalStatusAuction {
  auction: Auction!
}

"Represents NFT details"
type OwnedNft @entity {
  "Timestamp of the block the NFT was created at"
  createdAt: DateTime!

  "NFT's video"
  video: Video! @unique

  "Auctions done for this NFT"
  auctions: [Auction!]! @derivedFrom(field: "nft")

  "Current owner of the NFT."
  owner: NftOwner!

  "NFT's transactional status"
  transactionalStatus: TransactionalStatus

  "Creator royalty (if any)"
  creatorRoyalty: Float

  "NFT's last sale price (if any)"
  lastSalePrice: BigInt

  "NFT's last sale date (if any)"
  lastSaleDate: DateTime

  "All NFT auction bids"
  bids: [Bid!]! @derivedFrom(field: "nft")

  "Flag to indicate whether the NFT is featured or not"
  isFeatured: Boolean!
}

"Represents various action types"
union AuctionType = AuctionTypeEnglish | AuctionTypeOpen

"Represents English auction details"
type AuctionTypeEnglish {
  "English auction duration in blocks"
  duration: Int!

  "Auction extension period in blocks"
  extensionPeriod: Int!

  "Block when auction is supposed to end"
  plannedEndAtBlock: Int!

  "Minimal step between auction bids"
  minimalBidStep: BigInt!
}

"Represents Open auction details"
type AuctionTypeOpen @variant {
  "Auction bid lock duration"
  bidLockDuration: Int!
}

"Represents NFT auction"
type Auction @entity {
  "Unique identifier"
  id: ID!

  "Auctioned NFT"
  nft: OwnedNft!

  "Member that won this auction"
  winningMember: Membership

  "Auction starting price"
  startingPrice: BigInt!

  "Price at which the auction gets completed instantly (if any)"
  buyNowPrice: BigInt

  "The type of auction"
  auctionType: AuctionType!

  "Auction last bid (if exists)"
  # TODO: Is it really needed? (bids(orderBy: amount_DESC, limit: 1).?[0])
  topBid: Bid

  "All bids made during this auction"
  bids: [Bid!]! @derivedFrom(field: "auction")

  "Block when auction starts"
  startsAtBlock: Int!

  "Block when auction ended"
  endedAtBlock: Int

  "Is auction canceled"
  isCanceled: Boolean!

  "Is auction completed"
  isCompleted: Boolean!

  "Auction participants whitelist"
  whitelistedMembers: [AuctionWhitelistedMember!] @derivedFrom(field: "auction")
}

type AuctionWhitelistedMember @entity @index(fields: ["auction", "member"], unique: true) {
  "{auctionId}-{memberId}"
  id: ID!
  auction: Auction!
  member: Membership!
}

"Represents bid in NFT auction"
type Bid @entity {
  "Unique identifier"
  id: ID!

  "Timestamp of the block the bid was created at"
  createdAt: DateTime!

  "NFT's auction"
  auction: Auction!

  "Bid's NFT"
  nft: OwnedNft!

  "Bidder membership"
  bidder: Membership!

  "Amount bidded"
  amount: BigInt!

  "Sign for canceled bid"
  isCanceled: Boolean!

  "Block in which the bid was placed"
  createdInBlock: Int!

  "Index in block of the related AuctionBidMade event"
  indexInBlock: Int!

  "Bid that was displaced by this bid in the English auction (if any)"
  previousTopBid: Bid
}