feat: add useful getters (#59)

src/auction-calculator/auction-calculator.ts

@@ -45,7 +45,7 @@ export class AuctionCalculator {
     /**
      * @see https://github.com/1inch/limit-order-settlement/blob/1b6757eecb2574953b543821db6f7bbff5afee48/contracts/extensions/BaseExtension.sol#L56
      */
-    calcAuctionTakingAmount(takingAmount: bigint, rate: number): bigint {
+    public calcAuctionTakingAmount(takingAmount: bigint, rate: number): bigint {
         const auctionTakingAmount =
             (BigInt(takingAmount) * (BigInt(rate) + RATE_BUMP_DENOMINATOR)) /
             RATE_BUMP_DENOMINATOR
@@ -62,7 +62,7 @@ export class AuctionCalculator {
      * @param time auction timestamp in seconds
      * @param blockBaseFee blockBaseFee in Wei, if passed, then rate will be calculated as if order executed in block with `blockBaseFee`
      */
-    calcRateBump(time: bigint, blockBaseFee = 0n): number {
+    public calcRateBump(time: bigint, blockBaseFee = 0n): number {
         const gasBump = this.getGasPriceBump(blockBaseFee)
         const auctionBump = this.getAuctionBump(time)
 

src/fusion-order/fusion-order.ts

@@ -19,6 +19,7 @@ import {
 import {AuctionCalculator} from '../auction-calculator'
 import {add0x} from '../utils'
 import {ZX} from '../constants'
+import {calcTakingAmount} from '../utils/amounts'
 
 export class FusionOrder {
     private static defaultExtra = {
@@ -136,6 +137,37 @@ export class FusionOrder {
         return this.inner.extension
     }
 
+    get maker(): Address {
+        return this.inner.maker
+    }
+
+    get takerAsset(): Address {
+        return this.inner.takerAsset
+    }
+
+    get makerAsset(): Address {
+        return this.inner.makerAsset
+    }
+
+    get takingAmount(): bigint {
+        return this.inner.takingAmount
+    }
+
+    get makingAmount(): bigint {
+        return this.inner.makingAmount
+    }
+
+    get receiver(): Address {
+        return this.inner.receiver
+    }
+
+    /**
+     * Timestamp in sec
+     */
+    get deadline(): bigint {
+        return this.inner.makerTraits.expiration() || 0n
+    }
+
     static new(
         /**
          * Fusion extension address
@@ -275,4 +307,29 @@ export class FusionOrder {
             this.fusionExtension.details
         )
     }
+
+    /**
+     * Calculates required taking amount for passed `makingAmount` at block time `time`
+     *
+     * @param makingAmount maker swap amount
+     * @param time execution time in sec
+     * @param blockBaseFee block fee in wei.
+     * */
+    public calcTakingAmount(
+        makingAmount: bigint,
+        time: bigint,
+        blockBaseFee = 0n
+    ): bigint {
+        const takingAmount = calcTakingAmount(
+            makingAmount,
+            this.makingAmount,
+            this.takingAmount
+        )
+
+        const calculator = this.getCalculator()
+
+        const bump = calculator.calcRateBump(time, blockBaseFee)
+
+        return calculator.calcAuctionTakingAmount(takingAmount, bump)
+    }
 }