feat: Add promotion code functionality to ticket orders

app/controllers/orders_controller.rb

@@ -126,6 +126,20 @@ class OrdersController < ApplicationController
     @total_amount = @order.total_amount_cents
     @expiring_soon = @order.expiring_soon?
 
+    # Handle promotion code application
+    if params[:promotion_code].present?
+      promotion_code = PromotionCode.valid.find_by(code: params[:promotion_code].upcase)
+      if promotion_code
+        # Apply the promotion code to the order
+        @order.promotion_codes << promotion_code
+        @order.calculate_total!
+        @total_amount = @order.total_amount_cents
+        flash.now[:notice] = "Code promotionnel appliqué: #{promotion_code.code}"
+      else
+        flash.now[:alert] = "Code promotionnel invalide"
+      end
+    end
+
     # For free orders, automatically mark as paid and redirect to success
     if @order.free?
       @order.mark_as_paid!

app/models/order.rb

@@ -7,6 +7,8 @@ class Order < ApplicationRecord
   belongs_to :user
   belongs_to :event
   has_many :tickets, dependent: :destroy
+  has_many :order_promotion_codes, dependent: :destroy
+  has_many :promotion_codes, through: :order_promotion_codes
 
   # === Validations ===
   validates :user_id, presence: true

app/models/order_promotion_code.rb

@@ -0,0 +1,26 @@
+class OrderPromotionCode < ApplicationRecord
+  # Associations
+  belongs_to :order
+  belongs_to :promotion_code
+
+  # Validations
+  validates :order, presence: true
+  validates :promotion_code, presence: true
+
+  # Callbacks
+  after_create :apply_discount
+  after_create :increment_promotion_code_uses
+
+  private
+
+  def apply_discount
+    # Apply the discount to the order
+    discount_amount = promotion_code.discount_amount_cents
+    order.update!(total_amount_cents: [ order.total_amount_cents - discount_amount, 0 ].max)
+  end
+
+  def increment_promotion_code_uses
+    # Increment the uses count on the promotion code
+    promotion_code.increment!(:uses_count)
+  end
+end

app/models/promotion_code.rb

@@ -0,0 +1,23 @@
+class PromotionCode < ApplicationRecord
+  # Validations
+  validates :code, presence: true, uniqueness: true
+  validates :discount_amount_cents, numericality: { greater_than_or_equal_to: 0 }
+
+  # Scopes
+  scope :active, -> { where(active: true) }
+  scope :expired, -> { where("expires_at < ? OR active = ?", Time.current, false) }
+  scope :valid, -> { active.where("expires_at > ? OR expires_at IS NULL", Time.current) }
+
+  # Callbacks
+  before_create :increment_uses_count
+
+  # Associations
+  has_many :order_promotion_codes
+  has_many :orders, through: :order_promotion_codes
+
+  private
+
+  def increment_uses_count
+    self.uses_count ||= 0
+  end
+end

app/views/orders/checkout.html.erb

@@ -118,6 +118,16 @@
           <p class="text-sm text-gray-600">Procédez au paiement pour finaliser votre commande</p>
         </div>
 
+        <!-- Promotion Code Section -->
+        <%= form_tag checkout_order_path(@order), method: :get, class: "mb-6" do %>
+          <div class="flex items-center bg-gray-50 border border-gray-200 rounded-lg p-3">
+            <%= text_field_tag :promotion_code, params[:promotion_code], class: "flex-1 border-none bg-transparent focus:ring-0 text-sm", placeholder: "Code promotionnel (optionnel)" %>
+            <%= button_tag type: "submit", class: "ml-2 btn btn-secondary py-2 px-4 text-sm" do %>
+              Appliquer
+            <% end %>
+          </div>
+        <% end %>
+
         <% if @checkout_session.present? %>
           <!-- Stripe Checkout -->
           <div class="space-y-6">
@@ -131,13 +141,13 @@
               </div>
             </div>
 
-  <button
-    id="checkout-button"
-    data-order-id="<%= @order.id %>"
-    data-increment-url="/api/v1/orders/<%= @order.id %>/increment_payment_attempt"
-    data-session-id="<%= @checkout_session.id if @checkout_session.present? %>"
-    class="w-full btn btn-primary py-4 px-6 rounded-xl transition-all duration-200 transform hover:scale-105 active:scale-95 shadow-lg hover:shadow-xl"
-  >
+<button
+  id="checkout-button"
+  data-order-id="<%= @order.id %>"
+  data-increment-url="/api/v1/orders/<%= @order.id %>/increment_payment_attempt"
+  data-session-id="<%= @checkout_session.id if @checkout_session.present? %>"
+  class="w-full btn btn-primary py-4 px-6 rounded-xl transition-all duration-200 transform hover:scale-105 active:scale-95 shadow-lg hover:shadow-xl"
+>
               <div class="flex items-center justify-center">
                 <i data-lucide="credit-card" class="w-5 h-5 mr-2"></i>
                 Payer <%= @order.total_amount_euros %>€
@@ -194,16 +204,16 @@
 
                 try {
                   // Increment payment attempt counter
-  const orderId = checkoutButton.dataset.orderId;
-  const incrementUrl = checkoutButton.dataset.incrementUrl;
-  console.log('Incrementing payment attempt for order:', orderId);
-  const response = await fetch(incrementUrl, {
-    method: 'PATCH',
-    headers: {
-      'Content-Type': 'application/json',
-      'X-CSRF-Token': document.querySelector('[name=csrf-token]').content
-    }
-  });
+const orderId = checkoutButton.dataset.orderId;
+const incrementUrl = checkoutButton.dataset.incrementUrl;
+console.log('Incrementing payment attempt for order:', orderId);
+const response = await fetch(incrementUrl, {
+  method: 'PATCH',
+  headers: {
+    'Content-Type': 'application/json',
+    'X-CSRF-Token': document.querySelector('[name=csrf-token]').content
+  }
+});
 
                   if (!response.ok) {
                     console.error('Payment attempt increment failed:', response.status, response.statusText);
@@ -224,11 +234,11 @@
                   `;
 
                   // Redirect to Stripe
-  const sessionId = checkoutButton.dataset.sessionId;
-  console.log('Redirecting to Stripe with session ID:', sessionId);
-  const stripeResult = await stripe.redirectToCheckout({
-    sessionId: sessionId
-  });
+const sessionId = checkoutButton.dataset.sessionId;
+console.log('Redirecting to Stripe with session ID:', sessionId);
+const stripeResult = await stripe.redirectToCheckout({
+  sessionId: sessionId
+});
 
                   if (stripeResult.error) {
                     throw new Error(stripeResult.error.message);