public void BuyToken(Address from, string symbol, BigInteger tokenID)
{
Runtime.Expect(Runtime.IsWitness(from), "invalid witness");
var auctionID = symbol + "." + tokenID;
Runtime.Expect(_auctionMap.ContainsKey <string>(auctionID), "invalid auction");
var auction = _auctionMap.Get <string, MarketAuction>(auctionID);
Runtime.Expect(Runtime.TokenExists(auction.BaseSymbol), "invalid base token");
var baseToken = Runtime.GetToken(auction.BaseSymbol);
Runtime.Expect(!baseToken.Flags.HasFlag(TokenFlags.Fungible), "token must be non-fungible");
var nft = Runtime.ReadToken(symbol, tokenID);
Runtime.Expect(nft.CurrentChain == Runtime.Chain.Name, "token not currently in this chain");
Runtime.Expect(nft.CurrentOwner == this.Address, "invalid owner");
if (auction.Creator != from)
{
Runtime.Expect(Runtime.TokenExists(auction.QuoteSymbol), "invalid quote token");
var quoteToken = Runtime.GetToken(auction.QuoteSymbol);
Runtime.Expect(quoteToken.Flags.HasFlag(TokenFlags.Fungible), "quote token must be fungible");
var balance = Runtime.GetBalance(quoteToken.Symbol, from);
Runtime.Expect(balance >= auction.Price, "not enough balance");
Runtime.Expect(Runtime.TransferTokens(quoteToken.Symbol, from, auction.Creator, auction.Price), "payment failed");
}
Runtime.Expect(Runtime.TransferToken(baseToken.Symbol, this.Address, from, auction.TokenID), "transfer failed");
_auctionMap.Remove <string>(auctionID);
_auctionIDs.Remove(auctionID);
if (auction.Creator == from)
{
Runtime.Notify(EventKind.OrderCancelled, from, new MarketEventData()
{
ID = auction.TokenID, BaseSymbol = auction.BaseSymbol, QuoteSymbol = auction.QuoteSymbol, Price = 0
});
}
else
{
Runtime.Notify(EventKind.TokenSend, from, new TokenEventData()
{
chainAddress = this.Address, symbol = auction.QuoteSymbol, value = auction.Price
});
Runtime.Notify(EventKind.TokenReceive, auction.Creator, new TokenEventData()
{
chainAddress = this.Address, symbol = auction.QuoteSymbol, value = auction.Price
});
Runtime.Notify(EventKind.OrderFilled, from, new MarketEventData()
{
ID = auction.TokenID, BaseSymbol = auction.BaseSymbol, QuoteSymbol = auction.QuoteSymbol, Price = auction.Price
});
}
Runtime.Notify(EventKind.TokenReceive, from, new TokenEventData()
{
chainAddress = this.Address, symbol = auction.BaseSymbol, value = auction.TokenID
});
}
