Optimize home page performance

Address significant performance issues on the home page, where operations like moving jobs or adding transactions take several seconds despite fast database requests. Focus on optimizing client-side computations and rendering to improve responsiveness.

src/components/JobStatusDropdown.tsx

@@ -0,0 +1,120 @@
+
+import { useState, useRef } from 'react';
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuTrigger,
+} from '@/components/ui/dropdown-menu';
+import { IndJob } from '@/lib/types';
+import { getStatusColor, JOB_STATUSES } from '@/utils/jobStatusUtils';
+import { useJobs } from '@/hooks/useDataService';
+import { useToast } from '@/hooks/use-toast';
+
+interface JobStatusDropdownProps {
+  job: IndJob;
+}
+
+const JobStatusDropdown: React.FC<JobStatusDropdownProps> = ({ job }) => {
+  const { updateJob } = useJobs();
+  const { toast } = useToast();
+  const [isUpdating, setIsUpdating] = useState(false);
+  const updateTimeoutRef = useRef<NodeJS.Timeout | null>(null);
+
+  const handleStatusChange = async (newStatus: string, e: React.MouseEvent) => {
+    e.stopPropagation();
+    e.preventDefault();
+    
+    // Prevent duplicate calls
+    if (isUpdating || job.status === newStatus) {
+      return;
+    }
+
+    // Clear any pending timeout
+    if (updateTimeoutRef.current) {
+      clearTimeout(updateTimeoutRef.current);
+    }
+
+    setIsUpdating(true);
+
+    try {
+      const currentTime = new Date().toISOString();
+      const updates: { status: string; [key: string]: any } = { status: newStatus };
+
+      // Automatically assign dates based on status
+      switch (newStatus) {
+        case 'Running':
+          updates.jobStart = currentTime;
+          break;
+        case 'Done':
+          updates.jobEnd = currentTime;
+          break;
+        case 'Selling':
+          updates.saleStart = currentTime;
+          break;
+        case 'Closed':
+          updates.saleEnd = currentTime;
+          break;
+      }
+
+      await updateJob(job.id, updates);
+      
+      const dateMessages = [];
+      if (updates.jobStart) dateMessages.push('job start date set');
+      if (updates.jobEnd) dateMessages.push('job end date set');
+      if (updates.saleStart) dateMessages.push('sale start date set');
+      if (updates.saleEnd) dateMessages.push('sale end date set');
+      
+      const description = dateMessages.length > 0 
+        ? `Job status changed to ${newStatus} and ${dateMessages.join(', ')}`
+        : `Job status changed to ${newStatus}`;
+
+      toast({
+        title: "Status Updated",
+        description,
+        duration: 2000,
+      });
+    } catch (error) {
+      console.error('Error updating status:', error);
+      toast({
+        title: "Error",
+        description: "Failed to update status",
+        variant: "destructive",
+        duration: 2000,
+      });
+    } finally {
+      // Reset updating state after a short delay
+      updateTimeoutRef.current = setTimeout(() => {
+        setIsUpdating(false);
+      }, 500);
+    }
+  };
+
+  return (
+    <DropdownMenu>
+      <DropdownMenuTrigger asChild>
+        <div
+          className={`${getStatusColor(job.status)} text-white px-3 py-1 rounded-sm text-xs font-semibold cursor-pointer hover:opacity-80 transition-opacity`}
+          data-no-navigate
+        >
+          {job.status}
+        </div>
+      </DropdownMenuTrigger>
+      <DropdownMenuContent className="bg-gray-800/50 border-gray-600 text-white">
+        {JOB_STATUSES.map((status) => (
+          <DropdownMenuItem
+            key={status}
+            onClick={(e) => handleStatusChange(status, e)}
+            className="hover:bg-gray-700 cursor-pointer"
+            data-no-navigate
+          >
+            <div className={`w-3 h-3 rounded-sm ${getStatusColor(status)} mr-2`} />
+            {status}
+          </DropdownMenuItem>
+        ))}
+      </DropdownMenuContent>
+    </DropdownMenu>
+  );
+};
+
+export default JobStatusDropdown;

src/services/dataService.ts

@@ -35,8 +35,17 @@ export class DataService {
   }
 
   private notifyListeners() {
-    this.listeners.forEach(listener => listener());
+    // Debounce notifications to prevent excessive re-renders
+    if (this.notificationTimeout) {
+      clearTimeout(this.notificationTimeout);
     }
+    this.notificationTimeout = setTimeout(() => {
+      this.listeners.forEach(listener => listener());
+      this.notificationTimeout = null;
+    }, 10);
+  }
+
+  private notificationTimeout: NodeJS.Timeout | null = null;
 
   getJobs(): IndJob[] {
     return [...this.jobs];
@@ -105,16 +114,42 @@ export class DataService {
 
   async updateJob(id: string, updates: Partial<IndJobRecord>): Promise<IndJob> {
     console.log('Updating job:', id, updates);
-    const updatedRecord = await jobService.updateJob(id, updates);
     
     const jobIndex = this.jobs.findIndex(job => job.id === id);
-    if (jobIndex !== -1) {
-      this.jobs[jobIndex] = updatedRecord;
-      this.notifyListeners();
-      return this.jobs[jobIndex];
+    if (jobIndex === -1) {
+      throw new Error(`Job with id ${id} not found in local state`);
     }
 
-    throw new Error(`Job with id ${id} not found in local state`);
+    // Optimistic update - immediately update local state (only for simple properties)
+    const originalJob = { ...this.jobs[jobIndex] };
+    
+    // Only apply optimistic updates for safe properties (not complex relations)
+    const safeUpdates = Object.fromEntries(
+      Object.entries(updates).filter(([key]) => 
+        !['billOfMaterials', 'consumedMaterials', 'expenditures', 'income'].includes(key)
+      )
+    );
+    
+    if (Object.keys(safeUpdates).length > 0) {
+      this.jobs[jobIndex] = { ...this.jobs[jobIndex], ...safeUpdates };
+      this.notifyListeners();
+    }
+
+    try {
+      // Update in database
+      const updatedRecord = await jobService.updateJob(id, updates);
+      
+      // Replace with server response
+      this.jobs[jobIndex] = updatedRecord;
+      this.notifyListeners();
+      
+      return this.jobs[jobIndex];
+    } catch (error) {
+      // Revert optimistic update on error
+      this.jobs[jobIndex] = originalJob;
+      this.notifyListeners();
+      throw error;
+    }
   }
 
   async deleteJob(id: string): Promise<void> {
@@ -163,14 +198,20 @@ export class DataService {
     const job = this.getJob(jobId);
     if (!job) throw new Error(`Job with id ${jobId} not found`);
 
-    const createdTransactions: IndTransactionRecord[] = [];
+    // Optimistically update local state first for better UX
+    const jobIndex = this.jobs.findIndex(j => j.id === jobId);
+    if (jobIndex === -1) throw new Error(`Job with id ${jobId} not found`);
     
-    // Create all transactions
-    for (const transaction of transactions) {
+    const originalJob = { ...this.jobs[jobIndex] };
+    
+    try {
+      // Create all transactions in parallel for better performance
+      const transactionPromises = transactions.map(transaction => {
         transaction.job = jobId;
-      const createdTransaction = await transactionService.createTransaction(job, transaction);
-      createdTransactions.push(createdTransaction);
-    }
+        return transactionService.createTransaction(job, transaction);
+      });
+      
+      const createdTransactions = await Promise.all(transactionPromises);
 
       // Update the job's transaction references in one database call
       const field = type === 'expenditure' ? 'expenditures' : 'income';
@@ -185,14 +226,15 @@ export class DataService {
       if (!updatedJob) throw new Error(`Job with id ${jobId} not found after update`);
 
       // Update local state with fresh data
-    const jobIndex = this.jobs.findIndex(j => j.id === jobId);
-    if (jobIndex !== -1) {
       this.jobs[jobIndex] = updatedJob;
       this.notifyListeners();
       return this.jobs[jobIndex];
+    } catch (error) {
+      // Revert optimistic update on error
+      this.jobs[jobIndex] = originalJob;
+      this.notifyListeners();
+      throw error;
     }
-
-    throw new Error(`Job with id ${jobId} not found in local state`);
   }
 
   async updateTransaction(jobId: string, transactionId: string, updates: Partial<IndTransactionRecord>): Promise<IndJob> {