FEAT: check for duplicate room assignments

assignroom.go

@@ -1,5 +1,9 @@
 package main
 
+import (
+	"fmt"
+)
+
 func AssignExtraRooms(rooms []RoomFolder, roomsPerNight int) {
 	latestnight := 0
 
@@ -27,3 +31,33 @@ func AssignExtraRooms(rooms []RoomFolder, roomsPerNight int) {
 		}
 	}
 }
+
+func CheckDuplicateRooms(rooms []RoomFolder) error {
+	maxnight := 0
+	maxroom := 0
+
+	for _, r := range rooms {
+		if r.Cfg.night > maxnight {
+			maxnight = r.Cfg.night
+		}
+		if r.Cfg.room > maxroom {
+			maxroom = r.Cfg.room
+		}
+	}
+
+	assignments := make([][]string, maxnight)
+	for night := range maxnight {
+		assignments[night] = make([]string, maxroom)
+	}
+
+	for _, r := range rooms {
+		if r.Cfg.night > 0 && r.Cfg.room > 0 {
+			if assignments[r.Cfg.night-1][r.Cfg.room-1] != "" {
+				return fmt.Errorf("duplicate room assignment for Room %d Night %d: %s, %s", r.Cfg.night, r.Cfg.room, assignments[r.Cfg.night][r.Cfg.room], r.Path)
+			}
+			assignments[r.Cfg.night-1][r.Cfg.room-1] = r.Path
+		}
+	}
+
+	return nil
+}