Add summary section with product breakdown

- Show total volume, total amount, and average price per product
- Include grand total row
- Products sorted alphabetically

src/main.rs

@@ -1,5 +1,6 @@
 use askama::Template;
 use chrono::Utc;
+use std::collections::HashMap;
 use std::env;
 use std::fs;
 use std::path::Path;
@@ -12,6 +13,21 @@ fn fmt(v: f64) -> String {
     format!("{:.2}", v)
 }
 
+#[derive(Clone)]
+struct ProductSummary {
+    name: String,
+    volume: String,
+    amount: String,
+    avg_price: String,
+}
+
+#[derive(Clone)]
+struct Summary {
+    total_volume: String,
+    grand_total: String,
+    products: Vec<ProductSummary>,
+}
+
 #[derive(Clone)]
 struct CardData {
     card_number: String,
@@ -34,7 +50,7 @@ struct FormattedTransaction {
 struct PreparedCustomer {
     customer_number: String,
     cards: Vec<CardData>,
-    grand_total: String,
+    summary: Summary,
 }
 
 impl PreparedCustomer {
@@ -78,10 +94,48 @@ impl PreparedCustomer {
             .map(|c| c.total_amount.parse::<f64>().unwrap())
             .sum();
 
+        let mut product_totals: HashMap<String, (f64, f64)> = HashMap::new();
+        for card in &cards {
+            for tx in &card.transactions {
+                let volume: f64 = tx.volume.parse().unwrap();
+                let amount: f64 = tx.amount.parse().unwrap();
+                let entry = product_totals
+                    .entry(tx.quality_name.clone())
+                    .or_insert((0.0, 0.0));
+                entry.0 += volume;
+                entry.1 += amount;
+            }
+        }
+
+        let mut products: Vec<ProductSummary> = product_totals
+            .into_iter()
+            .map(|(name, (volume, amount))| {
+                let avg_price = if volume > 0.0 { amount / volume } else { 0.0 };
+                ProductSummary {
+                    name,
+                    volume: fmt(volume),
+                    amount: fmt(amount),
+                    avg_price: fmt(avg_price),
+                }
+            })
+            .collect();
+        products.sort_by(|a, b| a.name.cmp(&b.name));
+
+        let total_volume: f64 = products
+            .iter()
+            .map(|p| p.volume.parse::<f64>().unwrap())
+            .sum();
+
+        let summary = Summary {
+            total_volume: fmt(total_volume),
+            grand_total: fmt(grand_total),
+            products,
+        };
+
         PreparedCustomer {
             customer_number: customer.customer_number,
             cards,
-            grand_total: fmt(grand_total),
+            summary,
         }
     }
 }

templates/customer.html

@@ -43,6 +43,40 @@
             font-size: 11px;
             color: #666;
         }
+        .summary {
+            background: #f5f5f5;
+            border: 1px solid #ccc;
+            padding: 12px;
+            margin-bottom: 15px;
+        }
+        .summary h2 {
+            margin: 0 0 10px 0;
+            font-size: 14px;
+            border-bottom: 1px solid #ccc;
+            padding-bottom: 5px;
+        }
+        .summary-table {
+            width: 100%;
+            border-collapse: collapse;
+            font-size: 11px;
+        }
+        .summary-table th, .summary-table td {
+            padding: 5px 8px;
+            text-align: left;
+        }
+        .summary-table th {
+            background: #e0e0e0;
+            font-weight: bold;
+        }
+        .summary-table td:not(:first-child),
+        .summary-table th:not(:first-child) {
+            text-align: right;
+        }
+        .grand-total-row td {
+            font-weight: bold;
+            border-top: 2px solid #333;
+            background: #f0f0f0;
+        }
         .card-section {
             margin-bottom: 15px;
             border: 1px solid #ccc;
@@ -111,6 +145,36 @@
         </div>
     </div>
 
+    <div class="summary">
+        <h2>Sammanfattning</h2>
+        <table class="summary-table">
+            <thead>
+                <tr>
+                    <th>Produkt</th>
+                    <th>Volym (L)</th>
+                    <th>Belopp</th>
+                    <th>Snittpris/L</th>
+                </tr>
+            </thead>
+            <tbody>
+                {% for product in customer.summary.products %}
+                <tr>
+                    <td>{{ product.name }}</td>
+                    <td>{{ product.volume }}</td>
+                    <td>{{ product.amount }} Kr</td>
+                    <td>{{ product.avg_price }} Kr</td>
+                </tr>
+                {% endfor %}
+                <tr class="grand-total-row">
+                    <td>Totalt</td>
+                    <td>{{ customer.summary.total_volume }}</td>
+                    <td>{{ customer.summary.grand_total }} Kr</td>
+                    <td></td>
+                </tr>
+            </tbody>
+        </table>
+    </div>
+
     {% for card in customer.cards %}
     <div class="card-section">
         <div class="card-header">
@@ -154,7 +218,7 @@
     {% endfor %}
 
     <div class="grand-total">
-        Totalsumma:<span>{{ customer.grand_total }} Kr</span>
+        Totalsumma:<span>{{ customer.summary.grand_total }} Kr</span>
     </div>
 </body>
 </html>