import FungibleToken from 0xf233dcee88fe0abe import SwapInterfaces from 0xb78ef7afa52ff906 import SwapConfig from 0xb78ef7afa52ff906 import PierRouter from 0xa0ebe96eb1366be6 import IPierPair from 0x609e10301860b683 import PierPair from 0x609e10301860b683 transaction(amountIn: UFix64, minAmountOut: UFix64) { prepare(userAccount: AuthAccount) { let wbtcVault = userAccount.borrow<&FungibleToken.Vault>(from: /storage/ceWBTCVault)!; let flowVault = userAccount.borrow<&FungibleToken.Vault>(from: /storage/flowTokenVault)!; let pool1 = getAccount(0x09c49abce2a7385c).getCapability<&{SwapInterfaces.PairPublic}>(/public/increment_swap_pair).borrow()! let poolInfo = pool1.getPairInfo() let f1 = poolInfo[2] as! UFix64 let u1 = poolInfo[3] as! UFix64 let pool2 = getAccount(0xfe1ebfe4c8af7ce1).getCapability<&PierPair.Pool{IPierPair.IPool}>(/public/metapierSwapPoolPublic).borrow()! let poolInfo2 = pool2.getReserves() let f2 = poolInfo2[0] let u2 = poolInfo2[1] let scale: UInt256 = 1_000_000_000_000_000_000 var a1 = u1; var b1 = f1 var a2 = u2; var b2 = f2 var flip = false if (b1/b2*a2 < a1) { a1 = u2; b1 = f2; a2 = u1; b2 = f1; flip = true } let F = 0.997; let F_ = SwapConfig.UFix64ToScaledUInt256(0.997) let A = 0.997; let A_ = F_ let B = a1*(1.0+F); let B_ = SwapConfig.UFix64ToScaledUInt256(B) var C = 0.0; if b1/b2*a2 >= a1 { C = (b1/b2*a2-a1)*a1; } let C_ = SwapConfig.UFix64ToScaledUInt256(C) let AA_ = B_*B_/scale+A_*C_/scale*(4 as UInt256) let x = (SwapConfig.ScaledUInt256ToUFix64(SwapConfig.sqrt(AA_)) - B) / (2.0*A) var amountIn1 = amountIn var amountIn2 = 0.0 if x >= amountIn { if (flip) { amountIn1 = 0.0; amountIn2 = amountIn; } else { amountIn1 = amountIn; amountIn2 = 0.0; } } else { let f1_aft = a1 + x; var f2_aft = b1; if (x > 0.0) { f2_aft = b1 - SwapConfig.getAmountOut(amountIn: x, reserveIn: a1, reserveOut: b1) } let x_left = amountIn - x; let x_left_to_a = x_left / (f1_aft + a2) * f1_aft; let in1 = x+x_left_to_a let in2 = amountIn - in1 if (flip) { amountIn1 = in2; amountIn2 = in1; } else { amountIn1 = in1; amountIn2 = in2; } } var out1 = 0.0; var out2 = 0.0 if (amountIn1 > 0.0) { let inVault1 <- wbtcVault.withdraw(amount: amountIn1); let outVault1 <- pool1.swap(vaultIn: <- inVault1, exactAmountOut: nil); out1 = outVault1.balance flowVault.deposit(from: <- outVault1) } if (amountIn2 > 0.0) { let inVault2 <- wbtcVault.withdraw(amount: amountIn2); let forAmount = SwapConfig.getAmountOut(amountIn: amountIn2, reserveIn: u2, reserveOut: f2) let outVault2 <- pool2.swap(fromVault: <-inVault2, forAmount: forAmount) out2 = outVault2.balance flowVault.deposit(from: <- outVault2) } assert(out1 + out2 >= minAmountOut, message: "s"); } }

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