added an autoallocate fixtures function

internal/db/fixture.go

@@ -280,3 +280,40 @@ func playOtherTeams(team *Team, teams []*Team, round int) []*versus {
 	}
 	return matchups
 }
+
+func AutoAllocateFixtures(fixtures []*Fixture, gamesPerWeek, startingWeek int) []*Fixture {
+	gameWeek := startingWeek
+	teamPlays := map[int]int{}
+	// Work on a copy so we can track what's remaining
+	remaining := make([]*Fixture, len(fixtures))
+	copy(remaining, fixtures)
+	for len(remaining) > 0 {
+		madeProgress := false
+		nextRemaining := make([]*Fixture, 0, len(remaining))
+		for _, fixture := range remaining {
+			if teamPlays[fixture.HomeTeamID] < gamesPerWeek &&
+				teamPlays[fixture.AwayTeamID] < gamesPerWeek {
+				gw := gameWeek
+				fixture.GameWeek = &gw
+				teamPlays[fixture.HomeTeamID]++
+				teamPlays[fixture.AwayTeamID]++
+				madeProgress = true
+			} else {
+				nextRemaining = append(nextRemaining, fixture)
+			}
+		}
+		if !madeProgress {
+			// No fixture could be placed this week — advance to avoid infinite loop
+			// (shouldn't happen with valid fixture data, but guards against edge cases)
+			gameWeek++
+			teamPlays = map[int]int{}
+			continue
+		}
+		remaining = nextRemaining
+		if len(remaining) > 0 {
+			gameWeek++
+			teamPlays = map[int]int{}
+		}
+	}
+	return fixtures
+}