# LaporMas Date Picker Optimization

## Changes Made

### Frontend (`datepicker.js`):

1. **DOM Element Caching:**
   - Cached frequently accessed DOM elements to avoid repeated query operations.

2. **Batch Quota Request:**
   - Replaced multiple individual quota check API calls with a single batch request.
   - Added fallback to individual quota checks for backward compatibility.

3. **Error Handling:**
   - Improved error handling with a centralized approach.
   - Added error recovery mechanism for quota checks.

4. **Function Optimization:**
   - Simplified the retry mechanism for date availability fetching.
   - Improved safety timeout mechanism to avoid nested timeouts.
   - Modularized CSS and UI initialization code.

### Backend:

1. **New Batch API Endpoint:**
   - Added a new `/check-quotas/{date}` endpoint that accepts a GET request with time values as a query parameter.
   - Optimized to fetch data for all time slots in a single database query.
   - Returns quota information for all requested time slots in one response.
   - Changed from POST to GET to avoid CSRF token issues.

2. **Performance Improvements:**
   - Reduced the number of database queries by using groupBy and batch fetching.
   - Improved error handling for invalid dates and holidays.

## How to Test

1. Open the registration form page.
2. Select a date in the calendar.
3. Observe that all time slots are checked in a single request (visible in browser network tab).
4. Verify that all slots show correct quota information.

## Backward Compatibility

The system maintains backward compatibility through:
1. Fallback to individual quota requests if batch endpoint is not found.
2. Preserved same response format for individual time slots.
3. Unchanged quota calculation logic.

## Files Modified

1. `/public/js/datepicker.js` - Optimized frontend code
2. `/routes/web.php` - Added new batch route
3. `/app/Http/Controllers/RegistrationController.php` - Added batch processing endpoint

A backup of the original datepicker.js has been created at `/public/js/datepicker.backup.js`.
