feat: polyswap contrats v0.1

Author: Intermarch3

src/Polyswap.sol

@@ -10,9 +10,20 @@ import {
 import {ComposableCoW} from "@composable-cow/ComposableCoW.sol";
 
 import {Trading} from "exchange/mixins/Trading.sol";
+import {OrderStatus} from "exchange/libraries/OrderStructs.sol";
 
 import {PolyswapOrder} from "./PolyswapOrder.sol";
 
+// --- error strings
+string constant INVALID_HASH = "invalid hash";
+string constant CONDITION_NOT_MET = "condition not met";
+string constant POLYMARKET_ORDER_CANCELLED = "polymarket order cancelled";
+
+/**
+    * @title Polyswap Conditional Order
+    * @dev This contract implements the logic for generating a tradeable order based on a Polyswap order.
+    *      It inherits from BaseConditionalOrder to work with the ComposableCoW framework.
+**/
 contract Polyswap is BaseConditionalOrder {
     ComposableCoW public immutable composableCow;
     Trading public immutable polymarket;
@@ -41,5 +52,12 @@ contract Polyswap is BaseConditionalOrder {
         order = PolyswapOrder.orderFor(polyswapOrder, polymarket);
 
         // check if the polymarket order is fulfilled
+        OrderStatus memory status = polymarket.getOrderStatus(polyswapOrder.polymarketOrderHash);
+        if (status.isFilledOrCancelled && status.remaining != 0) {
+            revert IConditionalOrder.PollNever(POLYMARKET_ORDER_CANCELLED);
+        }
+        if (!(status.isFilledOrCancelled && status.remaining == 0)) {
+            revert IConditionalOrder.PollTryNextBlock(CONDITION_NOT_MET);
+        }
     }
 }

src/PolyswapOrder.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-3.0
+// SPDX-License-Identifier: UNLICENSED
 pragma solidity >=0.8.0 <0.9.0;
 
 import {SafeCast} from "@openzeppelin/contracts/utils/math/SafeCast.sol";
@@ -58,7 +58,7 @@ library PolyswapOrder {
         // Check if the Polymarket order is valid and not filled or cancelled.
         if (!(self.polymarketOrderHash == 0)) revert IConditionalOrder.OrderNotValid(INVALID_POLYMARKET_ORDER_HASH);
         OrderStatus memory order = polymarket.getOrderStatus(self.polymarketOrderHash);
-        if (!(order.remaining != 0 || order.isFilledOrCancelled == false)) {
+        if (order.remaining == 0 && order.isFilledOrCancelled == false) {
             revert IConditionalOrder.OrderNotValid(INVALID_POLYMARKET_ORDER_HASH);
         }
     }
@@ -78,7 +78,7 @@ library PolyswapOrder {
             receiver: self.receiver,
             sellAmount: self.sellAmount,
             buyAmount: self.minBuyAmount,
-            validTo: uint32(self.t),
+            validTo: self.t.toUint32(),
             appData: self.polymarketOrderHash,
             feeAmount: 0,
             kind: GPv2Order.KIND_SELL,