## Backend Implementation

Enhanced TicketType model with helper methods and better validations

So the full context is:

## Backend Implementation
- Enhanced TicketType model with helper methods and better validations
- New Promoter::TicketTypesController with full authorization
- Sales status tracking (draft, available, upcoming, expired, sold_out)
- New Promoter::TicketTypesController with full authorization
- Safe calculation methods preventing nil value errors
- Sales status tracking (draft, available, upcoming, expired, sold_out)

## Frontend Features
- Modern responsive UI with Tailwind CSS styling
- Interactive forms with Stimulus controller for dynamic calculations
- Revenue calculators showing potential, current, and remaining revenue
- Status indicators with appropriate colors and icons
- Buyer analytics and purchase history display

## JavaScript Enhancements
- New TicketTypeFormController for dynamic pricing calculations
- Real-time total updates as users type price/quantity
- Proper French currency formatting
- Form validation for minimum quantities based on existing sales

## Bug Fixes
 Fixed nil value errors in price_euros method when price_cents is nil
 Added defensive programming for all calculation methods
 Graceful handling of incomplete ticket types during creation
 Proper default values for new ticket type instances

## Files Added/Modified
- app/controllers/promoter/ticket_types_controller.rb (new)
- app/javascript/controllers/ticket_type_form_controller.js (new)
- app/views/promoter/ticket_types/*.html.erb (4 new view files)
- app/models/ticket_type.rb (enhanced with helper methods)
- config/routes.rb (added nested ticket_types routes)
- db/migrate/*_add_requires_id_to_ticket_types.rb (new migration)

## Integration
- Seamless integration with existing event management system
- Updated promoter event show page with ticket management link
- Proper scoping ensuring promoters only manage their own tickets
- Compatible with existing ticket purchasing and checkout flow

app/javascript/controllers/index.js

@@ -22,6 +22,9 @@ application.register("header", HeaderController);
 import EventFormController from "./event_form_controller"
 application.register("event-form", EventFormController);
 
+import TicketTypeFormController from "./ticket_type_form_controller"
+application.register("ticket-type-form", TicketTypeFormController);
+
 
 
 

app/javascript/controllers/ticket_type_form_controller.js

@@ -0,0 +1,61 @@
+import { Controller } from "@hotwired/stimulus"
+
+// Ticket Type Form Controller
+// Handles dynamic pricing calculations and form interactions
+export default class extends Controller {
+  static targets = ["price", "quantity", "total"]
+
+  connect() {
+    console.log("Ticket type form controller connected")
+    this.updateTotal()
+  }
+
+  // Update total revenue calculation when price or quantity changes
+  updateTotal() {
+    const price = parseFloat(this.priceTarget.value) || 0
+    const quantity = parseInt(this.quantityTarget.value) || 0
+    const total = price * quantity
+
+    // Format as currency
+    const formatter = new Intl.NumberFormat('fr-FR', {
+      style: 'currency',
+      currency: 'EUR',
+      minimumFractionDigits: 2
+    })
+
+    if (this.hasQuantityTarget && this.hasTotalTarget) {
+      // For new ticket types, calculate potential revenue
+      this.totalTarget.textContent = formatter.format(total)
+    } else if (this.hasTotalTarget) {
+      // For edit forms, calculate remaining potential revenue
+      const soldTickets = parseInt(this.element.dataset.soldTickets) || 0
+      const remainingQuantity = Math.max(0, quantity - soldTickets)
+      const remainingRevenue = price * remainingQuantity
+      this.totalTarget.textContent = formatter.format(remainingRevenue)
+    }
+  }
+
+  // Validate minimum quantity (for edit forms with sold tickets)
+  validateQuantity() {
+    const soldTickets = parseInt(this.element.dataset.soldTickets) || 0
+    const quantity = parseInt(this.quantityTarget.value) || 0
+
+    if (quantity < soldTickets) {
+      this.quantityTarget.value = soldTickets
+      this.quantityTarget.setCustomValidity(`La quantité ne peut pas être inférieure à ${soldTickets} (billets déjà vendus)`)
+    } else {
+      this.quantityTarget.setCustomValidity('')
+    }
+
+    this.updateTotal()
+  }
+
+  // Format price input to ensure proper decimal places
+  formatPrice() {
+    const price = parseFloat(this.priceTarget.value)
+    if (!isNaN(price)) {
+      this.priceTarget.value = price.toFixed(2)
+    }
+    this.updateTotal()
+  }
+}