break ties by timestamp

1 files changed, 42 insertions, 0 deletions

diff --git a/src/util.rs b/src/util.rs
new file mode 100644
index 0000000..a05eeb9
--- /dev/null
+++ b/src/util.rs
@@ -0,0 +1,42 @@
+//! Uh-oh, a `util.rs` file. That can't be good.
+
+use crate::database::{BoardRow, Placement};
+
+pub fn tiebreak_shared_positions(board: Vec<BoardRow>) -> Vec<Placement> {
+	let first = match board.first() {
+		Some(r) => r.clone(),
+		None => return vec![],
+	};
+
+	let mut last_score = first.points;
+	let mut last_placed = 1;
+	let mut placed = vec![Placement {
+		row: first,
+		placement: 1,
+		placement_tie: 1,
+		placement_first_of_tie: true,
+	}];
+
+	for (idx, row) in board.into_iter().enumerate().skip(1) {
+		if row.points == last_score {
+			placed.push(Placement {
+				row,
+				placement: idx + 1,
+				placement_tie: last_placed,
+				placement_first_of_tie: false,
+			});
+		} else {
+			last_score = row.points;
+			last_placed = idx + 1;
+
+			placed.push(Placement {
+				row,
+				placement: idx + 1,
+				placement_tie: last_placed,
+				placement_first_of_tie: true,
+			});
+		}
+	}
+
+	placed
+}