Improve error reporting and conflict visualization for shift assignments

Refactor shift assignment logic to use database transactions and improve error message parsing for assignment failures.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: e5565357-90e1-419f-b9a8-6ee8394636df
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/6d543d2c-20b9-4ea6-93fe-70fe9b1d9f80/e5565357-90e1-419f-b9a8-6ee8394636df/NBwOcnR

.replit

@@ -19,10 +19,18 @@ externalPort = 80
 localPort = 33035
 externalPort = 3001
 
+[[ports]]
+localPort = 33659
+externalPort = 5000
+
 [[ports]]
 localPort = 41343
 externalPort = 3000
 
+[[ports]]
+localPort = 41803
+externalPort = 4200
+
 [[ports]]
 localPort = 42175
 externalPort = 3002

client/src/pages/general-planning.tsx

@@ -143,9 +143,26 @@ export default function GeneralPlanning() {
       setSelectedCell(null);
     },
     onError: (error: any) => {
+      // Parse error message from API response
+      let errorMessage = "Impossibile assegnare la guardia";
+      if (error.message) {
+        // Error format from apiRequest: "STATUS_CODE: {json_body}"
+        const match = error.message.match(/^\d+:\s*(.+)$/);
+        if (match) {
+          try {
+            const parsed = JSON.parse(match[1]);
+            errorMessage = parsed.message || errorMessage;
+          } catch {
+            errorMessage = match[1];
+          }
+        } else {
+          errorMessage = error.message;
+        }
+      }
+      
       toast({
-        title: "Errore",
-        description: error.message || "Impossibile assegnare la guardia",
+        title: "Errore Assegnazione",
+        description: errorMessage,
         variant: "destructive",
       });
     },
@@ -653,7 +670,9 @@ export default function GeneralPlanning() {
                               </p>
                               {guard.conflicts && guard.conflicts.length > 0 && (
                                 <p className="text-destructive font-medium">
-                                  ⚠️ Conflitto: {guard.conflicts.join(", ")}
+                                  ⚠️ Conflitto: {guard.conflicts.map((c: any) => 
+                                    `${c.siteName} (${new Date(c.from).toLocaleTimeString('it-IT', {hour: '2-digit', minute:'2-digit'})} - ${new Date(c.to).toLocaleTimeString('it-IT', {hour: '2-digit', minute:'2-digit'})})`
+                                  ).join(", ")}
                                 </p>
                               )}
                               {guard.unavailabilityReasons && guard.unavailabilityReasons.length > 0 && (

server/routes.ts

@@ -1225,71 +1225,97 @@ export async function registerRoutes(app: Express): Promise<Server> {
         }
       }
       
-      // Find or create shift for this site/date (spanning the full service period)
-      const dayStart = new Date(shiftDate);
-      dayStart.setHours(0, 0, 0, 0);
-      const dayEnd = new Date(shiftDate);
-      dayEnd.setHours(23, 59, 59, 999);
-      
-      let existingShifts = await db
-        .select()
-        .from(shifts)
-        .where(
-          and(
-            eq(shifts.siteId, siteId),
-            gte(shifts.startTime, dayStart),
-            lte(shifts.startTime, dayEnd)
-          )
-        );
-      
-      let shift;
-      if (existingShifts.length > 0) {
-        // Use existing shift
-        shift = existingShifts[0];
-      } else {
-        // Create new shift for full service period
-        const serviceStart = site.serviceStartTime || "00:00";
-        const serviceEnd = site.serviceEndTime || "23:59";
+      // Atomic transaction: find/create shift + verify no overlaps + create assignment
+      const result = await db.transaction(async (tx) => {
+        // Find or create shift for this site/date
+        const dayStart = new Date(shiftDate);
+        dayStart.setHours(0, 0, 0, 0);
+        const dayEnd = new Date(shiftDate);
+        dayEnd.setHours(23, 59, 59, 999);
         
-        const [startHour, startMin] = serviceStart.split(":").map(Number);
-        const [endHour, endMin] = serviceEnd.split(":").map(Number);
+        let existingShifts = await tx
+          .select()
+          .from(shifts)
+          .where(
+            and(
+              eq(shifts.siteId, siteId),
+              gte(shifts.startTime, dayStart),
+              lte(shifts.startTime, dayEnd)
+            )
+          );
         
-        const shiftStart = new Date(shiftDate);
-        shiftStart.setHours(startHour, startMin, 0, 0);
-        
-        const shiftEnd = new Date(shiftDate);
-        shiftEnd.setHours(endHour, endMin, 0, 0);
-        
-        // If service ends before it starts, it spans midnight
-        if (shiftEnd <= shiftStart) {
-          shiftEnd.setDate(shiftEnd.getDate() + 1);
+        let shift;
+        if (existingShifts.length > 0) {
+          shift = existingShifts[0];
+        } else {
+          // Create new shift for full service period
+          const serviceStart = site.serviceStartTime || "00:00";
+          const serviceEnd = site.serviceEndTime || "23:59";
+          
+          const [startHour, startMin] = serviceStart.split(":").map(Number);
+          const [endHour, endMin] = serviceEnd.split(":").map(Number);
+          
+          const shiftStart = new Date(shiftDate);
+          shiftStart.setHours(startHour, startMin, 0, 0);
+          
+          const shiftEnd = new Date(shiftDate);
+          shiftEnd.setHours(endHour, endMin, 0, 0);
+          
+          if (shiftEnd <= shiftStart) {
+            shiftEnd.setDate(shiftEnd.getDate() + 1);
+          }
+          
+          [shift] = await tx.insert(shifts).values({
+            siteId: site.id,
+            startTime: shiftStart,
+            endTime: shiftEnd,
+            shiftType: site.shiftType || "fixed_post",
+            status: "planned",
+          }).returning();
         }
         
-        [shift] = await db.insert(shifts).values({
-          siteId: site.id,
-          startTime: shiftStart,
-          endTime: shiftEnd,
-          shiftType: site.shiftType || "fixed_post",
-          status: "planned",
+        // Recheck overlaps within transaction to prevent race conditions
+        const existingAssignments = await tx
+          .select()
+          .from(shiftAssignments)
+          .where(eq(shiftAssignments.guardId, guard.id));
+        
+        for (const existing of existingAssignments) {
+          const hasOverlap = 
+            plannedStart < existing.plannedEndTime && 
+            plannedEnd > existing.plannedStartTime;
+          
+          if (hasOverlap) {
+            throw new Error(
+              `Conflitto: guardia già assegnata ${existing.plannedStartTime.toLocaleString()} - ${existing.plannedEndTime.toLocaleString()}`
+            );
+          }
+        }
+        
+        // Create assignment within transaction
+        const [assignment] = await tx.insert(shiftAssignments).values({
+          shiftId: shift.id,
+          guardId: guard.id,
+          plannedStartTime: plannedStart,
+          plannedEndTime: plannedEnd,
         }).returning();
-      }
-      
-      // Create shift assignment with planned time slot
-      const assignment = await storage.createShiftAssignment({
-        shiftId: shift.id,
-        guardId: guard.id,
-        plannedStartTime: plannedStart,
-        plannedEndTime: plannedEnd,
+        
+        return { assignment, shift };
       });
       
       res.json({ 
         message: "Guard assigned successfully",
-        assignment,
-        shift
+        assignment: result.assignment,
+        shift: result.shift
       });
     } catch (error: any) {
       console.error("Error assigning guard:", error);
-      if (error.message?.includes('overlap') || error.message?.includes('conflict')) {
+      // Check for overlap/conflict errors (both English and Italian)
+      const errorMessage = error.message?.toLowerCase() || '';
+      if (errorMessage.includes('overlap') || 
+          errorMessage.includes('conflict') || 
+          errorMessage.includes('conflitto') ||
+          errorMessage.includes('già assegnata')) {
         return res.status(409).json({ message: error.message });
       }
       res.status(500).json({ message: "Failed to assign guard", error: String(error) });