pub fn create(
  origin, 
  title: Vec<u8>,  // 标题
  url: Vec<u8>,  // 链接
  desc: Vec<u8> // 详情
)

pub fn remove(
  origin, 
  nft_id: T::NftId // 艺术品Id
)

pub fn transfer(
  origin, 
  target: T::AccountId, // 转移目标
  nft_id: T::NftId // 艺术品Id
)

pub fn order_sell(
  origin, 
  nft_id: T::NftId,  // 艺术品Id
  start_price: BalanceOf<T>, // 起拍价格
  end_price: BalanceOf<T>, // 结拍价格
  keep_block_num: T::BlockNumber // 拍卖最大保留区块数量
)

pub fn order_buy(
  origin, 
  order_id: T::OrderId, // 订单Id
  price: BalanceOf<T> // 竞拍价格
)

pub fn order_settlement(
  origin, 
  order_id: T::OrderId // 订单Id
)

pub fn vote_order(
  origin, 
  order_id: T::OrderId,  // 订单Id
  amount: BalanceOf<T> // 质押数量
)

pub struct Nft {
	pub title: Vec<u8>, // 标题
	pub url: Vec<u8>, // 链接
	pub desc: Vec<u8>, // 详情
}

pub struct Order<OrderId, NftId, AccountId, Balance, BlockNumber> {
	pub order_id: OrderId, // 订单Id
	pub start_price: Balance, // 起拍价格
	pub end_price: Balance, // 结拍价格
	pub nft_id: NftId, // nftId
	pub create_block: BlockNumber, // 创建时区块数
	pub keep_block_num: BlockNumber, // 最大保留区块数
	pub owner: AccountId, // nft所有者
}

pub struct Bid<OrderId, AccountId, Balance> {
	pub order_id: OrderId, // 订单Id
	pub price: Balance, // 竞拍价格
	pub owner: AccountId, // 竞拍人
}

pub struct Vote<OrderId, AccountId, Balance, BlockNumber> {
	pub order_id: OrderId, // 订单Id
	pub amount: Balance, // 质押数量
	pub keep_block_num: BlockNumber, // 通过拍卖单生成的质押区块长度
	pub owner: AccountId, // 质押者
}

pub Nfts: map hasher(twox_64_concat) T::NftId => Option<Nft>;

pub NftAccount: map hasher(twox_64_concat) T::NftId => T::AccountId;

pub NftOrder: map hasher(twox_64_concat) T::NftId => Option<T::OrderId>;

pub Orders: map hasher(twox_64_concat) T::OrderId => Option<OrderOf<T>>;

pub Bids: map hasher(twox_64_concat) T::OrderId => Option<BidOf<T>>;

pub Votes: map hasher(twox_64_concat) T::OrderId => Vec<VoteOf<T>>;

pub NextNftId: T::NftId;