fix: Pass proper group tokens in EncodingContext...

Also:
- Remove amount_out_min. Our reasoning is that we perform high-level final amount checks anyway (and expect users to do the same). Lower-level USV4 min amount checks are redundant.

src/encoding/evm/strategy_encoder/strategy_encoders.rs

@@ -2,7 +2,6 @@ use std::{collections::HashSet, str::FromStr};
 
 use alloy_primitives::{aliases::U24, FixedBytes, U256, U8};
 use alloy_sol_types::SolValue;
-use num_bigint::BigUint;
 use tycho_core::{keccak256, Bytes};
 
 use crate::encoding::{
@@ -187,16 +186,15 @@ impl StrategyEncoder for SplitSwapStrategyEncoder {
                     ))
                 })?;
 
-            let encoding_context = EncodingContext {
-                receiver: solution.router_address.clone(),
-                exact_out: solution.exact_out,
-                router_address: solution.router_address.clone(),
-                group_token_in: tokens.first().unwrap().clone(),
-                group_token_out: tokens.last().unwrap().clone(),
-                amount_out_min: min_amount_out.clone(),
-            };
             let mut grouped_protocol_data: Vec<u8> = vec![];
             for swap in grouped_swap.swaps.iter() {
+                let encoding_context = EncodingContext {
+                    receiver: solution.router_address.clone(),
+                    exact_out: solution.exact_out,
+                    router_address: solution.router_address.clone(),
+                    group_token_in: grouped_swap.input_token.clone(),
+                    group_token_out: grouped_swap.output_token.clone(),
+                };
                 let protocol_data =
                     swap_encoder.encode_swap(swap.clone(), encoding_context.clone())?;
                 grouped_protocol_data.extend(protocol_data);
@@ -297,9 +295,8 @@ impl StrategyEncoder for ExecutorStrategyEncoder {
                 receiver: receiver.clone(),
                 exact_out: solution.exact_out,
                 router_address: router_address.clone(),
-                group_token_in: swap.token_in.clone(),
-                group_token_out: swap.token_out.clone(),
-                amount_out_min: BigUint::from(1u128),
+                group_token_in: grouped_swap.input_token.clone(),
+                group_token_out: grouped_swap.output_token.clone(),
             };
             let protocol_data = swap_encoder.encode_swap(swap.clone(), encoding_context.clone())?;
             grouped_protocol_data.extend(protocol_data);

src/encoding/evm/swap_encoder/swap_encoders.rs

@@ -1,6 +1,6 @@
 use std::str::FromStr;
 
-use alloy_primitives::{Address, Bytes as AlloyBytes};
+use alloy_primitives::{Address, Bytes as AlloyBytes, U256};
 use alloy_sol_types::SolValue;
 
 use crate::encoding::{
@@ -8,8 +8,7 @@ use crate::encoding::{
     evm::{
         approvals::protocol_approvals_manager::ProtocolApprovalsManager,
         utils::{
-            biguint_to_u256, bytes_to_address, encode_function_selector, get_static_attribute,
-            pad_to_fixed_size,
+            bytes_to_address, encode_function_selector, get_static_attribute, pad_to_fixed_size,
         },
     },
     models::{EncodingContext, Swap},
@@ -192,7 +191,7 @@ impl SwapEncoder for UniswapV4SwapEncoder {
         let group_token_in_address = bytes_to_address(&encoding_context.group_token_in)?;
         let group_token_out_address = bytes_to_address(&encoding_context.group_token_out)?;
 
-        let amount_out_min = biguint_to_u256(&encoding_context.amount_out_min);
+        let amount_out_min = U256::from(0);
         let zero_to_one = Self::get_zero_to_one(token_in_address, token_out_address);
         let callback_executor = bytes_to_address(&encoding_context.router_address)?;
 
@@ -289,7 +288,7 @@ mod tests {
     use std::collections::HashMap;
 
     use alloy::hex::encode;
-    use num_bigint::{BigInt, BigUint};
+    use num_bigint::BigInt;
     use tycho_core::{dto::ProtocolComponent, Bytes};
 
     use super::*;
@@ -315,7 +314,6 @@ mod tests {
             router_address: Bytes::zero(20),
             group_token_in: token_in.clone(),
             group_token_out: token_out.clone(),
-            amount_out_min: BigUint::from(0u128),
         };
         let encoder =
             UniswapV2SwapEncoder::new(String::from("0x543778987b293C7E8Cf0722BB2e935ba6f4068D4"));
@@ -363,7 +361,6 @@ mod tests {
             router_address: Bytes::zero(20),
             group_token_in: token_in.clone(),
             group_token_out: token_out.clone(),
-            amount_out_min: BigUint::from(0u128),
         };
         let encoder =
             UniswapV3SwapEncoder::new(String::from("0x543778987b293C7E8Cf0722BB2e935ba6f4068D4"));
@@ -412,7 +409,6 @@ mod tests {
             router_address: Bytes::zero(20),
             group_token_in: token_in.clone(),
             group_token_out: token_out.clone(),
-            amount_out_min: BigUint::from(0u128),
         };
         let encoder =
             BalancerV2SwapEncoder::new(String::from("0x543778987b293C7E8Cf0722BB2e935ba6f4068D4"));
@@ -474,7 +470,6 @@ mod tests {
 
             group_token_in: token_in.clone(),
             group_token_out: token_out.clone(),
-            amount_out_min: BigUint::from(1u128),
         };
         let encoder =
             UniswapV4SwapEncoder::new(String::from("0x543778987b293C7E8Cf0722BB2e935ba6f4068D4"));
@@ -490,8 +485,8 @@ mod tests {
                 "4c9edd5852cd905f086c759e8383e09bff1e68b3",
                 // group token out
                 "dac17f958d2ee523a2206206994597c13d831ec7",
-                // amount out min (0 as u128)
-                "0000000000000000000000000000000000000000000000000000000000000001",
+                // amount out min
+                "0000000000000000000000000000000000000000000000000000000000000000",
                 // zero for one
                 "01",
                 // router address
@@ -543,7 +538,6 @@ mod tests {
             group_token_in: group_token_in.clone(),
             // Token out is the same as the group token out
             group_token_out: token_out.clone(),
-            amount_out_min: BigUint::from(1u128),
         };
 
         let encoder =
@@ -582,7 +576,6 @@ mod tests {
             router_address: router_address.clone(),
             group_token_in: usde_address.clone(),
             group_token_out: wbtc_address.clone(),
-            amount_out_min: BigUint::from(1u128),
         };
 
         // Setup - First sequence: USDE -> USDT
@@ -656,8 +649,8 @@ mod tests {
                 "4c9edd5852cd905f086c759e8383e09bff1e68b3",
                 // group_token out
                 "2260fac5e5542a773aa44fbcfedf7c193bc2c599",
-                // amount out min (1 as u128)
-                "0000000000000000000000000000000000000000000000000000000000000001",
+                // amount out min
+                "0000000000000000000000000000000000000000000000000000000000000000",
                 // zero for one
                 "01",
                 // router address

src/encoding/models.rs

@@ -108,7 +108,6 @@ pub struct Transaction {
 /// * `router_address`: Address of the router contract to be used for the swaps.
 /// * `group_token_in`: Token to be used as the input for the group swap.
 /// * `group_token_out`: Token to be used as the output for the group swap.
-/// * `amount_out_min`: Minimum amount of the output token to be received.
 #[derive(Clone, Debug)]
 pub struct EncodingContext {
     pub receiver: Bytes,
@@ -116,7 +115,6 @@ pub struct EncodingContext {
     pub router_address: Bytes,
     pub group_token_in: Bytes,
     pub group_token_out: Bytes,
-    pub amount_out_min: BigUint,
 }
 
 #[derive(Clone, PartialEq, Eq, Hash)]