From fac9c858a05857734681c5827b15699b0edc1802 Mon Sep 17 00:00:00 2001
From: taureau75 <vixidev99@protonmail.com>
Date: Fri, 16 Jun 2023 19:15:22 -0400
Subject: [PATCH] max liquidity

---
 frontend/components/bridge/Bridge.tsx         | 22 ++++++++++++++++++-
 .../bridge/tokenSelector/TokenSelector.tsx    |  6 ++---
 2 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/frontend/components/bridge/Bridge.tsx b/frontend/components/bridge/Bridge.tsx
index 70e654b..ad43854 100644
--- a/frontend/components/bridge/Bridge.tsx
+++ b/frontend/components/bridge/Bridge.tsx
@@ -81,6 +81,7 @@ function Bridge() {
   const [amount, setAmount] = useState<number | string>("")
   const [destAmount, setDestAmount] = useState<number | string>("")
   const [prices, setPrices] = useState<{ [priceKey: string]: number }>({ "btc_usd": 0, "eth_usd": 0, "sol_usd": 0 })
+  const [liquidity, setLiquidity] = useState<{ [liquidityKey: string]: number }>({ "btc": 0, "sol": 0, "eth_btc": 0, "eth_sol": 0 })
   const [withdrawAddress, setWithdrawAddress] = useState("")
   const [depositAddress, setDepositAddress] = useState<string>("")
   const [sendingSolPayment, setSendingSolPayment] = useState<boolean>(false)
@@ -189,6 +190,21 @@ function Bridge() {
     }
   }
 
+  const fetchLiquidity = async () => {
+    try {
+      const availableLiquidity = await fetch("https://api.zap.zigzag.exchange/available_liquidity").then(r => r.json())
+      setLiquidity(availableLiquidity)
+    } catch (err: any) {
+      console.log(err?.message || err)
+    }
+  }
+
+  const getCurrentDestLiquidity = () => {
+    if (destTokenItem.name == "ETH" && orgTokenItem.name == "SOL") return liquidity.eth_sol
+    if (destTokenItem.name == "ETH" && orgTokenItem.name == "BTC") return liquidity.eth_btc
+    return liquidity[destTokenItem.name.toLowerCase()]
+  }
+
   const fetchHistory = async () => {
     try {
       let historyAddress = address
@@ -224,6 +240,7 @@ function Bridge() {
     }
     fetchPrices()
     fetchHistory()
+    fetchLiquidity()
   }, [address, isConnected, isLoading, orgChainId, walletChain, orgTokenItem.name])
 
   const handleTokenClick = (newTokenAddress: string) => {
@@ -397,7 +414,8 @@ function Bridge() {
     const chains = ([orgChainId, destChainId]).sort()
     if (chains[0] === 2 && chains[1] === 3) return "Unsupported Chain Swap"
     if (!amount) return "Enter Amount"
-    if (amount > orgTokenItem.maxSize) return `Max size is ${orgTokenItem.maxSize} ${orgTokenItem.name}`
+    const maxSize = getCurrentDestLiquidity() - destTokenItem.liquidityBuffer
+    if (destAmount > maxSize) return `Max size is ${maxSize.toPrecision(6)} ${destTokenItem.name}`
     if (amount < orgTokenItem.minSize) return `Min size is ${orgTokenItem.minSize} ${orgTokenItem.name}`
     if (!address && orgTokenItem.name === "ETH") return "Connect Wallet"
     if (!address && orgTokenItem.name === "SOL") return "Connect Wallet"
@@ -578,6 +596,8 @@ function Bridge() {
     }
 
     setInterval(fetchHistory, 5000)
+    setTimeout(fetchLiquidity, 5000)
+    setTimeout(fetchLiquidity, 30000)
   }
 
   const getCurrentMarketPrices = () => {
diff --git a/frontend/components/bridge/tokenSelector/TokenSelector.tsx b/frontend/components/bridge/tokenSelector/TokenSelector.tsx
index 309766f..be00d7f 100644
--- a/frontend/components/bridge/tokenSelector/TokenSelector.tsx
+++ b/frontend/components/bridge/tokenSelector/TokenSelector.tsx
@@ -21,7 +21,7 @@ export const evmTokenItems = [
     icon: "eth.svg",
     networkIcon: "eth.svg",
     priceKey: "eth_usd",
-    maxSize: 10,
+    liquidityBuffer: 0.1,
     minSize: 0.004,
     networkFee: 0.0015
   },
@@ -84,7 +84,7 @@ export const solTokenItems = [
     icon: "sol.svg",
     networkIcon: "sol.svg",
     priceKey: "sol_usd",
-    maxSize: 500,
+    liquidityBuffer: 0.1,
     minSize: 0.3,
     networkFee: 0.001
   },
@@ -130,7 +130,7 @@ export const btcTokenItems = [
     icon: "btc.svg",
     networkIcon: "btc.svg",
     priceKey: "btc_usd", 
-    maxSize: 1,
+    liquidityBuffer: 0.001,
     minSize: 0.0003,
     networkFee: 0.0001
   },