From 21f07d1cb2c887ccc3b52aa4932d3950909fb35d Mon Sep 17 00:00:00 2001
From: Rich Freedman <richfreedman@gmail.com>
Date: Tue, 3 Feb 2026 19:51:06 -0500
Subject: [PATCH] Issue #19 Improve DX Cluster Exclusion (partial)

Modify the existing callsign exclusion to:
1. Only exclude DX stations, instead of both DE and DX
2. Treat the entered callsign as prefix, instead of matching any substring
e.g. excluding "VE" now excludes 'VE3ABC' but not 'K3VE'
---
 src/components/DXFilterManager.jsx | 2 +-
 src/hooks/useDXCluster.js          | 9 ++++-----
 src/utils/callsign.js              | 3 +--
 3 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/src/components/DXFilterManager.jsx b/src/components/DXFilterManager.jsx
index 377da25..a9c69b6 100644
--- a/src/components/DXFilterManager.jsx
+++ b/src/components/DXFilterManager.jsx
@@ -279,7 +279,7 @@ export const DXFilterManager = ({ filters, onFilterChange, isOpen, onClose }) =>
     <div>
       <div style={{ marginBottom: '16px' }}>
         <div style={{ fontSize: '13px', fontWeight: '600', color: 'var(--text-primary)', marginBottom: '8px' }}>
-          Exclude List - Hide these callsigns
+          Exclude List - Hide DX callsigns beginning with:
         </div>
         <div style={{ display: 'flex', gap: '8px' }}>
           <input
diff --git a/src/hooks/useDXCluster.js b/src/hooks/useDXCluster.js
index 571f1bb..f1b2bb4 100644
--- a/src/hooks/useDXCluster.js
+++ b/src/hooks/useDXCluster.js
@@ -26,17 +26,16 @@ export const useDXCluster = (source = 'auto', filters = {}) => {
       // Watchlist only mode - must match watchlist
       if (filters.watchlistOnly && filters.watchlist?.length > 0) {
         const matchesWatchlist = filters.watchlist.some(w => 
-          spot.call?.toUpperCase().includes(w.toUpperCase()) ||
-          spot.spotter?.toUpperCase().includes(w.toUpperCase())
+          spot.call?.toUpperCase().includes(w.toUpperCase())
         );
         if (!matchesWatchlist) return false;
       }
       
-      // Exclude list - hide matching calls
+      // Exclude list - hide matching calls - match the call as a prefix
       if (filters.excludeList?.length > 0) {
         const isExcluded = filters.excludeList.some(exc =>
-          spot.call?.toUpperCase().includes(exc.toUpperCase()) ||
-          spot.spotter?.toUpperCase().includes(exc.toUpperCase())
+          spot.call?.toUpperCase().startsWith(exc.toUpperCase()) ||
+          spot.spotter?.toUpperCase().startsWith(exc.toUpperCase())
         );
         if (isExcluded) return false;
       }
diff --git a/src/utils/callsign.js b/src/utils/callsign.js
index 2207fa2..64b829d 100644
--- a/src/utils/callsign.js
+++ b/src/utils/callsign.js
@@ -242,8 +242,7 @@ export const filterDXPaths = (paths, filters) => {
     // Exclude list - hide matching callsigns
     if (filters.excludeList?.length > 0) {
       const isExcluded = filters.excludeList.some(e =>
-        path.dxCall?.toUpperCase().includes(e.toUpperCase()) ||
-        path.spotter?.toUpperCase().includes(e.toUpperCase())
+        path.dxCall?.toUpperCase().startsWith(e.toUpperCase())
       );
       if (isExcluded) return false;
     }