book.gno

  1package stdcol
  2
  3import (
  4	"chain"
  5	"chain/banker"
  6	"strconv"
  7
  8	"gno.land/p/g1n4pl5uc4yt5r96m9w6fmdznx3x0jyg8l6arhmt/bazaar/fee/v1"
  9	"gno.land/r/g1n4pl5uc4yt5r96m9w6fmdznx3x0jyg8l6arhmt/bazaar/factory"
 10)
 11
 12const protocolBps = int64(50)
 13
 14func List(cur realm, id int, priceUgnot int64) {
 15	caller := requireUser(cur)
 16	if priceUgnot <= 0 {
 17		panic("col: price")
 18	}
 19	it := mustItem(id)
 20	if it.listed {
 21		panic("col: listed")
 22	}
 23	if it.owner != caller {
 24		panic("col: not owner")
 25	}
 26	grcTransfer(caller, caller, self, id)
 27	it.listed = true
 28	it.seller = caller
 29	it.price = priceUgnot
 30	it.owner = self
 31	items.Set(itemKey(id), it)
 32	chain.Emit("List", "id", strconv.Itoa(id), "seller", caller.String(), "price", strconv.FormatInt(priceUgnot, 10))
 33}
 34
 35func UpdatePrice(cur realm, id int, priceUgnot int64) {
 36	caller := requireUser(cur)
 37	if priceUgnot <= 0 {
 38		panic("col: price")
 39	}
 40	it := mustItem(id)
 41	if !it.listed {
 42		panic("col: not listed")
 43	}
 44	if it.seller != caller {
 45		panic("col: not seller")
 46	}
 47	it.price = priceUgnot
 48	items.Set(itemKey(id), it)
 49	chain.Emit("List", "id", strconv.Itoa(id), "seller", caller.String(), "price", strconv.FormatInt(priceUgnot, 10))
 50}
 51
 52func Cancel(cur realm, id int) {
 53	caller := requireUser(cur)
 54	it := mustItem(id)
 55	if !it.listed {
 56		panic("col: not listed")
 57	}
 58	if caller != it.seller {
 59		panic("col: not seller")
 60	}
 61	grcTransfer(self, self, it.seller, id)
 62	it.listed = false
 63	it.owner = it.seller
 64	it.seller = address("")
 65	it.price = 0
 66	items.Set(itemKey(id), it)
 67	chain.Emit("Cancel", "id", strconv.Itoa(id))
 68}
 69
 70func Buy(cur realm, id int) {
 71	caller := requireUser(cur)
 72	it := mustItem(id)
 73	if !it.listed {
 74		panic("col: not listed")
 75	}
 76	takeExact(it.price)
 77	if caller == it.seller {
 78		panic("col: self buy")
 79	}
 80	price := it.price
 81	proto := fee.ProtocolFee(price, protocolBps)
 82	royal := int64(0)
 83	if royaltyBps > 0 {
 84		royal = fee.ProtocolFee(price, int64(royaltyBps))
 85	}
 86	if proto+royal > price {
 87		panic("col: fee")
 88	}
 89	sellerAmt := price - proto - royal
 90	bk := banker.NewBanker(banker.BankerTypeRealmSend, cur)
 91	if sellerAmt > 0 {
 92		bk.SendCoins(self, it.seller, chain.Coins{{Denom: nativeDenom, Amount: sellerAmt}})
 93	}
 94	if royal > 0 {
 95		bk.SendCoins(self, creator, chain.Coins{{Denom: nativeDenom, Amount: royal}})
 96	}
 97	if proto > 0 {
 98		bk.SendCoins(self, factory.Address(), chain.Coins{{Denom: nativeDenom, Amount: proto}})
 99	}
100	grcTransfer(self, self, caller, id)
101	it.listed = false
102	it.owner = caller
103	it.seller = address("")
104	it.price = 0
105	items.Set(itemKey(id), it)
106	chain.Emit("Buy", "id", strconv.Itoa(id), "buyer", caller.String(), "fee", strconv.FormatInt(proto, 10))
107}
108
109func Transfer(cur realm, to address, id int) {
110	caller := requireUser(cur)
111	if !to.IsValid() {
112		panic("col: invalid address")
113	}
114	if to == caller || to == self {
115		panic("col: invalid address")
116	}
117	it := mustItem(id)
118	if it.listed {
119		panic("col: listed")
120	}
121	if it.owner != caller {
122		panic("col: not owner")
123	}
124	grcTransfer(caller, caller, to, id)
125	it.owner = to
126	items.Set(itemKey(id), it)
127	chain.Emit("Transfer", "id", strconv.Itoa(id), "to", to.String())
128}
129
130func ProtocolBps() int64 {
131	return protocolBps
132}
133
134func grcTransfer(spender, from, to address, id int) {
135	err := ledger.TransferFrom(spender, from, to, itemTid(id))
136	if err != nil {
137		panic("col: transfer")
138	}
139}