From cd8c798bd4eb1f4ef1c0e0d3b4db198295634814 Mon Sep 17 00:00:00 2001
From: mitteneer <swebbguy@gmail.com>
Date: Mon, 14 Jul 2025 14:01:48 -0400
Subject: [PATCH] Fix incorrect pairing function

---
 src/app/views/upload.zig | 6 ++++--
 src/date_fmt.zig         | 2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/app/views/upload.zig b/src/app/views/upload.zig
index 15deee3..3e9e8ba 100644
--- a/src/app/views/upload.zig
+++ b/src/app/views/upload.zig
@@ -177,12 +177,14 @@ pub fn post(request: *jetzig.Request) !jetzig.View {
         }
     }
 
-    std.log.debug("\nSkipped {} tracks\nFiltered {} tracks by date", .{ skipped_tracks, limited_tracks });
+    std.log.debug("Skipped {} tracks\nFiltered {} tracks by date", .{ skipped_tracks, limited_tracks });
     try job.schedule();
 
     return request.render(.created);
 }
 
+// Cantor Pairing Function
+// https://en.wikipedia.org/wiki/Pairing_function
 fn pair(a: u64, b: u64) u64 {
-    return @divFloor((a +% b) *% (a +% b +% 1) +% b, 2);
+    return @mod(@divFloor((a +% b) *% (a +% b +% 1), 2) +% b, std.math.maxInt(u64));
 }
diff --git a/src/date_fmt.zig b/src/date_fmt.zig
index 5a883b4..e6914a4 100644
--- a/src/date_fmt.zig
+++ b/src/date_fmt.zig
@@ -64,7 +64,7 @@ const ScrobbleFields = enum {
     ms_played, // Spotify playtime
     reason_end, // Spotify reason end,1_000
     @"@attr", // LastFM now playing
-    irrelevant,
+    irrelevant, // Not a field I care about
 };
 
 pub fn scrobbleIngest(allocator: std.mem.Allocator, input: []const u8) ![]Data.UnifiedScrobble {