From 209450cb25ac872416923e42cddc1844c5c30ef1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sehyun=20Chung=20=E2=9C=8C=EF=B8=8E?=
 <41171808+sehyunc@users.noreply.github.com>
Date: Mon, 16 Dec 2024 14:37:41 -0800
Subject: [PATCH] external-api: add `get_quote_amount` helper

---
 external-api/src/http/external_match.rs | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/external-api/src/http/external_match.rs b/external-api/src/http/external_match.rs
index 75c02501..62152ed5 100644
--- a/external-api/src/http/external_match.rs
+++ b/external-api/src/http/external_match.rs
@@ -161,7 +161,7 @@ impl ExternalOrder {
     ///
     /// The price here is expected to be decimal corrected; i.e. multiplied by
     /// the decimal diff for the two tokens
-    fn get_base_amount(&self, price: FixedPoint) -> Amount {
+    pub fn get_base_amount(&self, price: FixedPoint) -> Amount {
         if self.base_amount != 0 {
             return self.base_amount;
         }
@@ -170,6 +170,20 @@ impl ExternalOrder {
         scalar_to_u128(&implied_base_amount)
     }
 
+    /// Get the quote amount of the order implied by the external order
+    ///
+    /// The price here is expected to be decimal corrected; i.e. multiplied by
+    /// the decimal diff for the two tokens
+    pub fn get_quote_amount(&self, price: FixedPoint) -> Amount {
+        if self.quote_amount != 0 {
+            return self.quote_amount;
+        }
+
+        let base_amount_scalar = Scalar::from(self.base_amount);
+        let implied_quote_amount = price * base_amount_scalar;
+        scalar_to_u128(&implied_quote_amount.floor())
+    }
+
     /// Get the min fill size in units of the base token
     ///
     /// If the order size is specified in the `base_amount` field, this is