Исправления расчёта цен и добавление функционала своей цены

- Исправлен расчёт цен: теперь учитывается метод (медиана/среднее) и период для каждого компонента
- Добавлены функции calculateMedian и calculateAverage
- Исправлен PreviewPrice для корректного предпросмотра с учётом настроек
- Сортировка по умолчанию изменена на популярность (desc)
- Добавлен раздел "Своя цена" в конфигуратор:
  - Ввод целевой цены с пропорциональным пересчётом всех позиций
  - Отображение скидки в процентах
  - Таблица скорректированных цен
  - Экспорт CSV со скидкой

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/handlers/pricing.go

@@ -2,6 +2,7 @@ package handlers
 
 import (
 	"net/http"
+	"sort"
 	"strconv"
 	"time"
 
@@ -13,6 +14,31 @@ import (
 	"gorm.io/gorm"
 )
 
+// calculateMedian returns the median of a sorted slice of prices
+func calculateMedian(prices []float64) float64 {
+	if len(prices) == 0 {
+		return 0
+	}
+	sort.Float64s(prices)
+	n := len(prices)
+	if n%2 == 0 {
+		return (prices[n/2-1] + prices[n/2]) / 2
+	}
+	return prices[n/2]
+}
+
+// calculateAverage returns the arithmetic mean of prices
+func calculateAverage(prices []float64) float64 {
+	if len(prices) == 0 {
+		return 0
+	}
+	var sum float64
+	for _, p := range prices {
+		sum += p
+	}
+	return sum / float64(len(prices))
+}
+
 type PricingHandler struct {
 	db             *gorm.DB
 	pricingService *pricing.Service
@@ -205,30 +231,45 @@ func (h *PricingHandler) recalculateSinglePrice(lotName string) {
 	}
 
 	periodDays := comp.PricePeriodDays
-	var result struct {
-		Price *float64
+	method := comp.PriceMethod
+	if method == "" {
+		method = models.PriceMethodMedian
 	}
 
-	// First try with configured period
+	// Get prices based on period
+	var prices []float64
 	if periodDays > 0 {
-		query := `SELECT AVG(price) as price FROM lot_log WHERE lot = ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY)`
-		h.db.Raw(query, lotName, periodDays).Scan(&result)
+		h.db.Raw(`SELECT price FROM lot_log WHERE lot = ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY) ORDER BY price`,
+			lotName, periodDays).Pluck("price", &prices)
 
-		// If no prices found in period, fall back to all time but keep user's period setting
-		if result.Price == nil || *result.Price <= 0 {
-			query = `SELECT AVG(price) as price FROM lot_log WHERE lot = ?`
-			h.db.Raw(query, lotName).Scan(&result)
+		// If no prices in period, try all time
+		if len(prices) == 0 {
+			h.db.Raw(`SELECT price FROM lot_log WHERE lot = ? ORDER BY price`, lotName).Pluck("price", &prices)
 		}
 	} else {
-		query := `SELECT AVG(price) as price FROM lot_log WHERE lot = ?`
-		h.db.Raw(query, lotName).Scan(&result)
+		h.db.Raw(`SELECT price FROM lot_log WHERE lot = ? ORDER BY price`, lotName).Pluck("price", &prices)
 	}
 
-	if result.Price == nil || *result.Price <= 0 {
+	if len(prices) == 0 {
 		return
 	}
 
-	finalPrice := *result.Price
+	// Calculate price based on method
+	var finalPrice float64
+	switch method {
+	case models.PriceMethodMedian:
+		finalPrice = calculateMedian(prices)
+	case models.PriceMethodAverage:
+		finalPrice = calculateAverage(prices)
+	default:
+		finalPrice = calculateMedian(prices)
+	}
+
+	if finalPrice <= 0 {
+		return
+	}
+
+	// Apply coefficient
 	if comp.PriceCoefficient != 0 {
 		finalPrice = finalPrice * (1 + comp.PriceCoefficient/100)
 	}
@@ -258,110 +299,96 @@ func (h *PricingHandler) RecalculateAll(c *gin.Context) {
 	c.SSEvent("progress", gin.H{"current": 0, "total": total, "status": "starting"})
 	c.Writer.Flush()
 
-	lotNames := make([]string, 0, len(components))
-	for i := range components {
-		lotNames = append(lotNames, components[i].LotName)
-	}
-
-	// Batch query: Get average prices with date info for all lots
-	// This query returns both all-time average and days since last quote
-	type PriceResult struct {
-		Lot          string   `gorm:"column:lot"`
-		AvgPrice     *float64 `gorm:"column:avg_price"`
-		AvgPrice90   *float64 `gorm:"column:avg_price_90"`
-		LastQuoteAge *int     `gorm:"column:last_quote_age"`
-	}
-	var priceResults []PriceResult
-	h.db.Raw(`
-		SELECT
-			lot,
-			AVG(price) as avg_price,
-			AVG(CASE WHEN date >= DATE_SUB(NOW(), INTERVAL 90 DAY) THEN price END) as avg_price_90,
-			DATEDIFF(NOW(), MAX(date)) as last_quote_age
-		FROM lot_log
-		WHERE lot IN ?
-		GROUP BY lot
-	`, lotNames).Scan(&priceResults)
-
-	// Build price maps
-	priceMap := make(map[string]PriceResult, len(priceResults))
-	for _, p := range priceResults {
-		priceMap[p.Lot] = p
-	}
-
 	c.SSEvent("progress", gin.H{"current": 0, "total": total, "status": "processing", "updated": 0, "skipped": 0, "manual": 0, "errors": 0})
 	c.Writer.Flush()
 
-	// Process components and prepare batch updates
+	// Process components individually to respect their settings
 	var updated, skipped, manual, errors int
 	now := time.Now()
-	batchSize := 200
 
-	for i := 0; i < len(components); i += batchSize {
-		end := i + batchSize
-		if end > len(components) {
-			end = len(components)
-		}
-		batch := components[i:end]
-
-		// Start transaction for batch updates
-		tx := h.db.Begin()
-
-		for _, comp := range batch {
-			// If manual price is set, use it
-			if comp.ManualPrice != nil && *comp.ManualPrice > 0 {
-				err := tx.Model(&models.LotMetadata{}).
-					Where("lot_name = ?", comp.LotName).
-					Updates(map[string]interface{}{
-						"current_price":    *comp.ManualPrice,
-						"price_updated_at": now,
-					}).Error
-				if err != nil {
-					errors++
-				} else {
-					manual++
-				}
-				continue
-			}
-
-			// Get price data for this component
-			priceData, hasPrices := priceMap[comp.LotName]
-			if !hasPrices || priceData.AvgPrice == nil || *priceData.AvgPrice <= 0 {
-				skipped++
-				continue
-			}
-
-			// Determine which price to use based on component settings
-			var finalPrice float64
-			periodDays := comp.PricePeriodDays
-
-			if periodDays <= 0 {
-				// Use all time
-				finalPrice = *priceData.AvgPrice
+	for i, comp := range components {
+		// If manual price is set, use it
+		if comp.ManualPrice != nil && *comp.ManualPrice > 0 {
+			err := h.db.Model(&models.LotMetadata{}).
+				Where("lot_name = ?", comp.LotName).
+				Updates(map[string]interface{}{
+					"current_price":    *comp.ManualPrice,
+					"price_updated_at": now,
+				}).Error
+			if err != nil {
+				errors++
 			} else {
-				// Try period price first (using 90-day as proxy)
-				if priceData.AvgPrice90 != nil && *priceData.AvgPrice90 > 0 {
-					finalPrice = *priceData.AvgPrice90
-				} else {
-					// Fall back to all time if no data in period, but keep user's period setting
-					finalPrice = *priceData.AvgPrice
-				}
+				manual++
 			}
+			goto sendProgress
+		}
+
+		// Calculate price based on component's individual settings
+		{
+			var basePrice *float64
+			periodDays := comp.PricePeriodDays
+			method := comp.PriceMethod
+			if method == "" {
+				method = models.PriceMethodMedian
+			}
+
+			// Build query based on period
+			var query string
+			var args []interface{}
+
+			if periodDays > 0 {
+				query = `SELECT price FROM lot_log WHERE lot = ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY) ORDER BY price`
+				args = []interface{}{comp.LotName, periodDays}
+			} else {
+				query = `SELECT price FROM lot_log WHERE lot = ? ORDER BY price`
+				args = []interface{}{comp.LotName}
+			}
+
+			var prices []float64
+			h.db.Raw(query, args...).Pluck("price", &prices)
+
+			// If no prices in period, try all time
+			if len(prices) == 0 && periodDays > 0 {
+				h.db.Raw(`SELECT price FROM lot_log WHERE lot = ? ORDER BY price`, comp.LotName).Pluck("price", &prices)
+			}
+
+			if len(prices) == 0 {
+				skipped++
+				goto sendProgress
+			}
+
+			// Calculate price based on method
+			switch method {
+			case models.PriceMethodMedian:
+				median := calculateMedian(prices)
+				basePrice = &median
+			case models.PriceMethodAverage:
+				avg := calculateAverage(prices)
+				basePrice = &avg
+			default:
+				median := calculateMedian(prices)
+				basePrice = &median
+			}
+
+			if basePrice == nil || *basePrice <= 0 {
+				skipped++
+				goto sendProgress
+			}
+
+			finalPrice := *basePrice
 
 			// Apply coefficient
 			if comp.PriceCoefficient != 0 {
 				finalPrice = finalPrice * (1 + comp.PriceCoefficient/100)
 			}
 
-			// Only update current_price and price_updated_at, preserve all other settings
-			updates := map[string]interface{}{
-				"current_price":    finalPrice,
-				"price_updated_at": now,
-			}
-
-			err := tx.Model(&models.LotMetadata{}).
+			// Update only price fields
+			err := h.db.Model(&models.LotMetadata{}).
 				Where("lot_name = ?", comp.LotName).
-				Updates(updates).Error
+				Updates(map[string]interface{}{
+					"current_price":    finalPrice,
+					"price_updated_at": now,
+				}).Error
 			if err != nil {
 				errors++
 			} else {
@@ -369,22 +396,20 @@ func (h *PricingHandler) RecalculateAll(c *gin.Context) {
 			}
 		}
 
-		// Commit batch
-		if err := tx.Commit().Error; err != nil {
-			errors += len(batch)
+	sendProgress:
+		// Send progress update every 50 components
+		if (i+1)%50 == 0 || i == len(components)-1 {
+			c.SSEvent("progress", gin.H{
+				"current": updated + skipped + manual + errors,
+				"total":   total,
+				"updated": updated,
+				"skipped": skipped,
+				"manual":  manual,
+				"errors":  errors,
+				"status":  "processing",
+			})
+			c.Writer.Flush()
 		}
-
-		// Send progress update
-		c.SSEvent("progress", gin.H{
-			"current": updated + skipped + manual + errors,
-			"total":   total,
-			"updated": updated,
-			"skipped": skipped,
-			"manual":  manual,
-			"errors":  errors,
-			"status":  "processing",
-		})
-		c.Writer.Flush()
 	}
 
 	// Update popularity scores
@@ -494,11 +519,16 @@ func (h *PricingHandler) PreviewPrice(c *gin.Context) {
 		return
 	}
 
-	// Get median for all time
-	var medianAllTime struct {
-		Price *float64
+	// Get all prices for calculations
+	var allPrices []float64
+	h.db.Raw(`SELECT price FROM lot_log WHERE lot = ? ORDER BY price`, req.LotName).Pluck("price", &allPrices)
+
+	// Calculate median for all time
+	var medianAllTime *float64
+	if len(allPrices) > 0 {
+		median := calculateMedian(allPrices)
+		medianAllTime = &median
 	}
-	h.db.Raw(`SELECT AVG(price) as price FROM lot_log WHERE lot = ?`, req.LotName).Scan(&medianAllTime)
 
 	// Get quote count
 	var quoteCount int64
@@ -511,31 +541,43 @@ func (h *PricingHandler) PreviewPrice(c *gin.Context) {
 	}
 	h.db.Raw(`SELECT price, date FROM lot_log WHERE lot = ? ORDER BY date DESC, lot_log_id DESC LIMIT 1`, req.LotName).Scan(&lastPrice)
 
-	// Calculate new price based on parameters
-	var basePrice *float64
+	// Calculate new price based on parameters (method, period, coefficient)
+	method := req.Method
+	if method == "" {
+		method = "median"
+	}
+
+	var prices []float64
 	if req.PeriodDays > 0 {
-		var result struct {
-			Price *float64
+		h.db.Raw(`SELECT price FROM lot_log WHERE lot = ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY) ORDER BY price`,
+			req.LotName, req.PeriodDays).Pluck("price", &prices)
+		// Fall back to all time if no prices in period
+		if len(prices) == 0 {
+			prices = allPrices
 		}
-		h.db.Raw(`SELECT AVG(price) as price FROM lot_log WHERE lot = ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY)`, req.LotName, req.PeriodDays).Scan(&result)
-		basePrice = result.Price
 	} else {
-		basePrice = medianAllTime.Price
+		prices = allPrices
 	}
 
 	var newPrice *float64
-	if basePrice != nil && *basePrice > 0 {
-		calculated := *basePrice
-		if req.Coefficient != 0 {
-			calculated = calculated * (1 + req.Coefficient/100)
+	if len(prices) > 0 {
+		var basePrice float64
+		if method == "average" {
+			basePrice = calculateAverage(prices)
+		} else {
+			basePrice = calculateMedian(prices)
 		}
-		newPrice = &calculated
+
+		if req.Coefficient != 0 {
+			basePrice = basePrice * (1 + req.Coefficient/100)
+		}
+		newPrice = &basePrice
 	}
 
 	c.JSON(http.StatusOK, gin.H{
 		"lot_name":        req.LotName,
 		"current_price":   comp.CurrentPrice,
-		"median_all_time": medianAllTime.Price,
+		"median_all_time": medianAllTime,
 		"new_price":       newPrice,
 		"quote_count":     quoteCount,
 		"manual_price":    comp.ManualPrice,

web/templates/admin_pricing.html

@@ -39,11 +39,11 @@
                     <span class="text-sm text-gray-500">Сортировка:</span>
                     <select id="sort-field" class="px-2 py-1 border rounded text-sm" onchange="changeSort()">
                         <option value="lot_name">Артикул</option>
-                        <option value="popularity_score">Популярность</option>
+                        <option value="popularity_score" selected>Популярность</option>
                         <option value="quote_count">Кол-во котировок</option>
                         <option value="current_price">Цена</option>
                     </select>
-                    <button onclick="toggleSortDir()" id="sort-dir-btn" class="px-2 py-1 border rounded text-sm">↑</button>
+                    <button onclick="toggleSortDir()" id="sort-dir-btn" class="px-2 py-1 border rounded text-sm">↓</button>
                 </div>
             </div>
         </div>
@@ -142,8 +142,8 @@ let perPage = 50;
 let searchTimeout = null;
 let currentSearch = '';
 let componentsCache = [];
-let sortField = 'lot_name';
-let sortDir = 'asc';
+let sortField = 'popularity_score';
+let sortDir = 'desc';
 
 async function loadTab(tab) {
     currentTab = tab;

web/templates/index.html

@@ -69,6 +69,66 @@
             <button onclick="exportCSV()" class="px-3 py-1 bg-gray-200 text-gray-700 rounded text-sm hover:bg-gray-300">Экспорт CSV</button>
         </div>
     </div>
+
+    <!-- Custom price section -->
+    <div id="custom-price-section" class="bg-white rounded-lg shadow p-4">
+        <h3 class="font-semibold mb-3">Своя цена</h3>
+        <div class="flex items-center gap-4 mb-4">
+            <div class="flex-1">
+                <label class="block text-sm text-gray-600 mb-1">Введите целевую цену</label>
+                <div class="flex items-center gap-2">
+                    <span class="text-gray-500">$</span>
+                    <input type="number" id="custom-price-input" step="0.01" min="0"
+                           placeholder="0.00"
+                           class="flex-1 px-3 py-2 border rounded focus:ring-2 focus:ring-blue-500"
+                           oninput="calculateCustomPrice()">
+                    <button onclick="clearCustomPrice()" class="px-3 py-2 text-gray-500 hover:text-gray-700">
+                        <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12"></path>
+                        </svg>
+                    </button>
+                </div>
+            </div>
+            <div id="discount-info" class="text-right hidden">
+                <div class="text-sm text-gray-600">Скидка</div>
+                <div class="text-2xl font-bold text-green-600" id="discount-percent">0%</div>
+            </div>
+        </div>
+
+        <!-- Adjusted prices table -->
+        <div id="adjusted-prices" class="hidden">
+            <div class="border-t pt-3">
+                <h4 class="text-sm font-medium text-gray-700 mb-2">Скорректированные цены</h4>
+                <div class="overflow-x-auto">
+                    <table class="w-full text-sm">
+                        <thead class="bg-gray-50">
+                            <tr>
+                                <th class="px-3 py-2 text-left text-xs font-medium text-gray-500 uppercase">Компонент</th>
+                                <th class="px-3 py-2 text-right text-xs font-medium text-gray-500 uppercase">Кол-во</th>
+                                <th class="px-3 py-2 text-right text-xs font-medium text-gray-500 uppercase">Было</th>
+                                <th class="px-3 py-2 text-right text-xs font-medium text-gray-500 uppercase">Стало</th>
+                                <th class="px-3 py-2 text-right text-xs font-medium text-gray-500 uppercase">Итого</th>
+                            </tr>
+                        </thead>
+                        <tbody id="adjusted-prices-body" class="divide-y"></tbody>
+                        <tfoot class="bg-gray-50 font-medium">
+                            <tr>
+                                <td class="px-3 py-2" colspan="2">Итого</td>
+                                <td class="px-3 py-2 text-right" id="adjusted-total-original">$0.00</td>
+                                <td class="px-3 py-2 text-right text-green-600" id="adjusted-total-new">$0.00</td>
+                                <td class="px-3 py-2 text-right text-green-600" id="adjusted-total-final">$0.00</td>
+                            </tr>
+                        </tfoot>
+                    </table>
+                </div>
+            </div>
+            <div class="mt-3 flex justify-end">
+                <button onclick="exportCSVWithCustomPrice()" class="px-4 py-2 bg-green-600 text-white rounded hover:bg-green-700">
+                    Экспорт CSV со скидкой
+                </button>
+            </div>
+        </div>
+    </div>
 </div>
 
 <!-- Autocomplete dropdown (shared) -->
@@ -643,6 +703,9 @@ function updateCartUI() {
     const total = cart.reduce((sum, item) => sum + (item.unit_price * item.quantity), 0);
     document.getElementById('cart-total').textContent = '$' + total.toLocaleString('en-US', {minimumFractionDigits: 2});
 
+    // Recalculate custom price section if active
+    calculateCustomPrice();
+
     if (cart.length === 0) {
         document.getElementById('cart-items').innerHTML =
             '<div class="text-gray-500 text-center py-2">Конфигурация пуста</div>';
@@ -752,6 +815,113 @@ async function exportCSV() {
     }
 }
 
+// Custom price functionality
+function calculateCustomPrice() {
+    const customPriceInput = document.getElementById('custom-price-input');
+    const customPrice = parseFloat(customPriceInput.value) || 0;
+
+    const originalTotal = cart.reduce((sum, item) => sum + (item.unit_price * item.quantity), 0);
+
+    if (customPrice <= 0 || cart.length === 0 || originalTotal <= 0) {
+        document.getElementById('adjusted-prices').classList.add('hidden');
+        document.getElementById('discount-info').classList.add('hidden');
+        return;
+    }
+
+    // Calculate discount percentage
+    const discountPercent = ((originalTotal - customPrice) / originalTotal) * 100;
+    const coefficient = customPrice / originalTotal;
+
+    // Show discount info
+    document.getElementById('discount-info').classList.remove('hidden');
+    document.getElementById('discount-percent').textContent = discountPercent.toFixed(1) + '%';
+
+    // Update discount color based on value
+    const discountEl = document.getElementById('discount-percent');
+    if (discountPercent > 0) {
+        discountEl.className = 'text-2xl font-bold text-green-600';
+    } else if (discountPercent < 0) {
+        discountEl.className = 'text-2xl font-bold text-red-600';
+    } else {
+        discountEl.className = 'text-2xl font-bold text-gray-600';
+    }
+
+    // Build adjusted prices table
+    let html = '';
+    let totalOriginal = 0;
+    let totalNew = 0;
+
+    cart.forEach(item => {
+        const originalPrice = item.unit_price;
+        const newPrice = originalPrice * coefficient;
+        const itemOriginalTotal = originalPrice * item.quantity;
+        const itemNewTotal = newPrice * item.quantity;
+
+        totalOriginal += itemOriginalTotal;
+        totalNew += itemNewTotal;
+
+        html += `
+            <tr>
+                <td class="px-3 py-2 font-mono">${escapeHtml(item.lot_name)}</td>
+                <td class="px-3 py-2 text-right">${item.quantity}</td>
+                <td class="px-3 py-2 text-right text-gray-500">$${originalPrice.toFixed(2)}</td>
+                <td class="px-3 py-2 text-right text-green-600">$${newPrice.toFixed(2)}</td>
+                <td class="px-3 py-2 text-right">$${itemNewTotal.toFixed(2)}</td>
+            </tr>
+        `;
+    });
+
+    document.getElementById('adjusted-prices-body').innerHTML = html;
+    document.getElementById('adjusted-total-original').textContent = '$' + totalOriginal.toFixed(2);
+    document.getElementById('adjusted-total-new').textContent = '$' + totalNew.toFixed(2);
+    document.getElementById('adjusted-total-final').textContent = '$' + totalNew.toFixed(2);
+    document.getElementById('adjusted-prices').classList.remove('hidden');
+}
+
+function clearCustomPrice() {
+    document.getElementById('custom-price-input').value = '';
+    document.getElementById('adjusted-prices').classList.add('hidden');
+    document.getElementById('discount-info').classList.add('hidden');
+}
+
+async function exportCSVWithCustomPrice() {
+    if (cart.length === 0) return;
+
+    const customPrice = parseFloat(document.getElementById('custom-price-input').value) || 0;
+    const originalTotal = cart.reduce((sum, item) => sum + (item.unit_price * item.quantity), 0);
+
+    if (customPrice <= 0 || originalTotal <= 0) {
+        showToast('Введите целевую цену', 'error');
+        return;
+    }
+
+    const coefficient = customPrice / originalTotal;
+
+    // Create adjusted cart
+    const adjustedCart = cart.map(item => ({
+        ...item,
+        unit_price: parseFloat((item.unit_price * coefficient).toFixed(2))
+    }));
+
+    try {
+        const resp = await fetch('/api/export/csv', {
+            method: 'POST',
+            headers: {'Content-Type': 'application/json'},
+            body: JSON.stringify({items: adjustedCart, name: configName})
+        });
+
+        const blob = await resp.blob();
+        const url = window.URL.createObjectURL(blob);
+        const a = document.createElement('a');
+        a.href = url;
+        a.download = (configName || 'config') + '.csv';
+        a.click();
+        window.URL.revokeObjectURL(url);
+    } catch(e) {
+        showToast('Ошибка экспорта', 'error');
+    }
+}
+
 </script>
 {{end}}