package handlers

import (
	"io"
	"net/http"
	"os"
	"sort"
	"strconv"
	"strings"
	"time"

	"git.mchus.pro/mchus/quoteforge/internal/models"
	"git.mchus.pro/mchus/quoteforge/internal/repository"
	"git.mchus.pro/mchus/quoteforge/internal/services"
	"git.mchus.pro/mchus/quoteforge/internal/services/alerts"
	"git.mchus.pro/mchus/quoteforge/internal/services/pricing"
	"git.mchus.pro/mchus/quoteforge/internal/warehouse"
	"github.com/gin-gonic/gin"
	"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
	alertService       *alerts.Service
	componentRepo      *repository.ComponentRepository
	priceRepo          *repository.PriceRepository
	statsRepo          *repository.StatsRepository
	stockImportService *services.StockImportService
	dbUsername         string
}

func NewPricingHandler(
	db *gorm.DB,
	pricingService *pricing.Service,
	alertService *alerts.Service,
	componentRepo *repository.ComponentRepository,
	priceRepo *repository.PriceRepository,
	statsRepo *repository.StatsRepository,
	stockImportService *services.StockImportService,
	dbUsername string,
) *PricingHandler {
	return &PricingHandler{
		db:                 db,
		pricingService:     pricingService,
		alertService:       alertService,
		componentRepo:      componentRepo,
		priceRepo:          priceRepo,
		statsRepo:          statsRepo,
		stockImportService: stockImportService,
		dbUsername:         dbUsername,
	}
}

func (h *PricingHandler) GetStats(c *gin.Context) {
	// Check if we're in offline mode
	if h.statsRepo == nil || h.alertService == nil {
		c.JSON(http.StatusOK, gin.H{
			"new_alerts_count":    0,
			"top_components":      []interface{}{},
			"trending_components": []interface{}{},
			"offline":             true,
		})
		return
	}

	newAlerts, _ := h.alertService.GetNewAlertsCount()
	topComponents, _ := h.statsRepo.GetTopComponents(10)
	trendingComponents, _ := h.statsRepo.GetTrendingComponents(10)

	c.JSON(http.StatusOK, gin.H{
		"new_alerts_count":    newAlerts,
		"top_components":      topComponents,
		"trending_components": trendingComponents,
	})
}

type ComponentWithCount struct {
	models.LotMetadata
	QuoteCount int64    `json:"quote_count"`
	UsedInMeta []string `json:"used_in_meta,omitempty"` // List of meta-articles that use this component
}

func (h *PricingHandler) ListComponents(c *gin.Context) {
	// Check if we're in offline mode
	if h.componentRepo == nil {
		c.JSON(http.StatusOK, gin.H{
			"components": []ComponentWithCount{},
			"total":      0,
			"page":       1,
			"per_page":   20,
			"offline":    true,
			"message":    "Управление ценами доступно только в онлайн режиме",
		})
		return
	}

	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	perPage, _ := strconv.Atoi(c.DefaultQuery("per_page", "20"))

	filter := repository.ComponentFilter{
		Category:  c.Query("category"),
		Search:    c.Query("search"),
		SortField: c.Query("sort"),
		SortDir:   c.Query("dir"),
	}

	if page < 1 {
		page = 1
	}
	if perPage < 1 || perPage > 100 {
		perPage = 20
	}
	offset := (page - 1) * perPage

	components, total, err := h.componentRepo.List(filter, offset, perPage)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	// Get quote counts
	lotNames := make([]string, len(components))
	for i, comp := range components {
		lotNames[i] = comp.LotName
	}

	counts, _ := h.priceRepo.GetQuoteCounts(lotNames)

	// Get meta usage information
	metaUsage := h.getMetaUsageMap(lotNames)

	// Combine components with counts
	result := make([]ComponentWithCount, len(components))
	for i, comp := range components {
		result[i] = ComponentWithCount{
			LotMetadata: comp,
			QuoteCount:  counts[comp.LotName],
			UsedInMeta:  metaUsage[comp.LotName],
		}
	}

	c.JSON(http.StatusOK, gin.H{
		"components": result,
		"total":      total,
		"page":       page,
		"per_page":   perPage,
	})
}

// getMetaUsageMap returns a map of lot_name -> list of meta-articles that use this component
func (h *PricingHandler) getMetaUsageMap(lotNames []string) map[string][]string {
	result := make(map[string][]string)

	// Get all components with meta_prices
	var metaComponents []models.LotMetadata
	h.db.Where("meta_prices IS NOT NULL AND meta_prices != ''").Find(&metaComponents)

	// Build reverse lookup: which components are used in which meta-articles
	for _, meta := range metaComponents {
		sources := strings.Split(meta.MetaPrices, ",")
		for _, source := range sources {
			source = strings.TrimSpace(source)
			if source == "" {
				continue
			}

			// Handle wildcard patterns
			if strings.HasSuffix(source, "*") {
				prefix := strings.TrimSuffix(source, "*")
				for _, lotName := range lotNames {
					if strings.HasPrefix(lotName, prefix) && lotName != meta.LotName {
						result[lotName] = append(result[lotName], meta.LotName)
					}
				}
			} else {
				// Direct match
				for _, lotName := range lotNames {
					if lotName == source && lotName != meta.LotName {
						result[lotName] = append(result[lotName], meta.LotName)
					}
				}
			}
		}
	}

	return result
}

// expandMetaPrices expands meta_prices string to list of actual lot names
func (h *PricingHandler) expandMetaPrices(metaPrices, excludeLot string) []string {
	sources := strings.Split(metaPrices, ",")
	var result []string
	seen := make(map[string]bool)

	for _, source := range sources {
		source = strings.TrimSpace(source)
		if source == "" {
			continue
		}

		if strings.HasSuffix(source, "*") {
			// Wildcard pattern - find matching lots
			prefix := strings.TrimSuffix(source, "*")
			var matchingLots []string
			h.db.Model(&models.LotMetadata{}).
				Where("lot_name LIKE ? AND lot_name != ?", prefix+"%", excludeLot).
				Pluck("lot_name", &matchingLots)
			for _, lot := range matchingLots {
				if !seen[lot] {
					result = append(result, lot)
					seen[lot] = true
				}
			}
		} else if source != excludeLot && !seen[source] {
			result = append(result, source)
			seen[source] = true
		}
	}

	return result
}

func (h *PricingHandler) GetComponentPricing(c *gin.Context) {
	// Check if we're in offline mode
	if h.componentRepo == nil || h.pricingService == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{
			"error":   "Управление ценами доступно только в онлайн режиме",
			"offline": true,
		})
		return
	}

	lotName := c.Param("lot_name")

	component, err := h.componentRepo.GetByLotName(lotName)
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "component not found"})
		return
	}

	stats, err := h.pricingService.GetPriceStats(lotName, 0)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"component":   component,
		"price_stats": stats,
	})
}

type UpdatePriceRequest struct {
	LotName     string             `json:"lot_name" binding:"required"`
	Method      models.PriceMethod `json:"method"`
	PeriodDays  int                `json:"period_days"`
	Coefficient float64            `json:"coefficient"`
	ManualPrice *float64           `json:"manual_price"`
	ClearManual bool               `json:"clear_manual"`
	MetaEnabled bool               `json:"meta_enabled"`
	MetaPrices  string             `json:"meta_prices"`
	MetaMethod  string             `json:"meta_method"`
	MetaPeriod  int                `json:"meta_period"`
	IsHidden    bool               `json:"is_hidden"`
}

func (h *PricingHandler) UpdatePrice(c *gin.Context) {
	// Check if we're in offline mode
	if h.db == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{
			"error":   "Обновление цен доступно только в онлайн режиме",
			"offline": true,
		})
		return
	}

	var req UpdatePriceRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	updates := map[string]interface{}{}

	// Update method if specified
	if req.Method != "" {
		updates["price_method"] = req.Method
	}

	// Update period days
	if req.PeriodDays >= 0 {
		updates["price_period_days"] = req.PeriodDays
	}

	// Update coefficient
	updates["price_coefficient"] = req.Coefficient

	// Handle meta prices
	if req.MetaEnabled && req.MetaPrices != "" {
		updates["meta_prices"] = req.MetaPrices
	} else {
		updates["meta_prices"] = ""
	}

	// Handle hidden flag
	updates["is_hidden"] = req.IsHidden

	// Handle manual price
	if req.ClearManual {
		updates["manual_price"] = nil
	} else if req.ManualPrice != nil {
		updates["manual_price"] = *req.ManualPrice
		// Also update current price immediately when setting manual
		updates["current_price"] = *req.ManualPrice
		updates["price_updated_at"] = time.Now()
	}

	err := h.db.Model(&models.LotMetadata{}).
		Where("lot_name = ?", req.LotName).
		Updates(updates).Error

	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	// Recalculate price if not using manual price
	if req.ManualPrice == nil {
		h.recalculateSinglePrice(req.LotName)
	}

	// Get updated component to return new price
	var comp models.LotMetadata
	h.db.Where("lot_name = ?", req.LotName).First(&comp)

	c.JSON(http.StatusOK, gin.H{
		"message":       "price updated",
		"current_price": comp.CurrentPrice,
	})
}

func (h *PricingHandler) recalculateSinglePrice(lotName string) {
	var comp models.LotMetadata
	if err := h.db.Where("lot_name = ?", lotName).First(&comp).Error; err != nil {
		return
	}

	// Skip if manual price is set
	if comp.ManualPrice != nil && *comp.ManualPrice > 0 {
		return
	}

	periodDays := comp.PricePeriodDays
	method := comp.PriceMethod
	if method == "" {
		method = models.PriceMethodMedian
	}

	// Determine which lot names to use for price calculation
	lotNames := []string{lotName}
	if comp.MetaPrices != "" {
		lotNames = h.expandMetaPrices(comp.MetaPrices, lotName)
	}

	// Get prices based on period from all relevant lots
	var prices []float64
	for _, ln := range lotNames {
		var lotPrices []float64
		if strings.HasSuffix(ln, "*") {
			pattern := strings.TrimSuffix(ln, "*") + "%"
			if periodDays > 0 {
				h.db.Raw(`SELECT price FROM lot_log WHERE lot LIKE ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY) ORDER BY price`,
					pattern, periodDays).Pluck("price", &lotPrices)
			} else {
				h.db.Raw(`SELECT price FROM lot_log WHERE lot LIKE ? ORDER BY price`, pattern).Pluck("price", &lotPrices)
			}
		} else {
			if periodDays > 0 {
				h.db.Raw(`SELECT price FROM lot_log WHERE lot = ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY) ORDER BY price`,
					ln, periodDays).Pluck("price", &lotPrices)
			} else {
				h.db.Raw(`SELECT price FROM lot_log WHERE lot = ? ORDER BY price`, ln).Pluck("price", &lotPrices)
			}
		}
		prices = append(prices, lotPrices...)
	}

	// If no prices in period, try all time
	if len(prices) == 0 && periodDays > 0 {
		for _, ln := range lotNames {
			var lotPrices []float64
			if strings.HasSuffix(ln, "*") {
				pattern := strings.TrimSuffix(ln, "*") + "%"
				h.db.Raw(`SELECT price FROM lot_log WHERE lot LIKE ? ORDER BY price`, pattern).Pluck("price", &lotPrices)
			} else {
				h.db.Raw(`SELECT price FROM lot_log WHERE lot = ? ORDER BY price`, ln).Pluck("price", &lotPrices)
			}
			prices = append(prices, lotPrices...)
		}
	}

	if len(prices) == 0 {
		return
	}

	// Calculate price based on method
	sortFloat64s(prices)
	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)
	}

	now := time.Now()
	// Only update price, preserve all user settings
	h.db.Model(&models.LotMetadata{}).
		Where("lot_name = ?", lotName).
		Updates(map[string]interface{}{
			"current_price":    finalPrice,
			"price_updated_at": now,
		})
}

func (h *PricingHandler) RecalculateAll(c *gin.Context) {
	// Check if we're in offline mode
	if h.db == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{
			"error":   "Пересчёт цен доступен только в онлайн режиме",
			"offline": true,
		})
		return
	}

	// Set headers for SSE
	c.Header("Content-Type", "text/event-stream")
	c.Header("Cache-Control", "no-cache")
	c.Header("Connection", "keep-alive")

	// Get all components with their settings
	var components []models.LotMetadata
	h.db.Find(&components)
	total := int64(len(components))

	// Pre-load all lot names for efficient wildcard matching
	var allLotNames []string
	h.db.Model(&models.LotMetadata{}).Pluck("lot_name", &allLotNames)
	lotNameSet := make(map[string]bool, len(allLotNames))
	for _, ln := range allLotNames {
		lotNameSet[ln] = true
	}

	// Pre-load latest quote dates for all lots (for checking updates)
	type LotDate struct {
		Lot  string
		Date time.Time
	}
	var latestDates []LotDate
	h.db.Raw(`SELECT lot, MAX(date) as date FROM lot_log GROUP BY lot`).Scan(&latestDates)
	lotLatestDate := make(map[string]time.Time, len(latestDates))
	for _, ld := range latestDates {
		lotLatestDate[ld.Lot] = ld.Date
	}

	// Send initial progress
	c.SSEvent("progress", gin.H{"current": 0, "total": total, "status": "starting"})
	c.Writer.Flush()

	// Process components individually to respect their settings
	var updated, skipped, manual, unchanged, errors int
	now := time.Now()
	progressCounter := 0

	for _, comp := range components {
		progressCounter++

		// If manual price is set, skip recalculation
		if comp.ManualPrice != nil && *comp.ManualPrice > 0 {
			manual++
			goto sendProgress
		}

		// Calculate price based on component's individual settings
		{
			periodDays := comp.PricePeriodDays
			method := comp.PriceMethod
			if method == "" {
				method = models.PriceMethodMedian
			}

			// Determine source lots for price calculation (using cached lot names)
			var sourceLots []string
			if comp.MetaPrices != "" {
				sourceLots = expandMetaPricesWithCache(comp.MetaPrices, comp.LotName, allLotNames)
			} else {
				sourceLots = []string{comp.LotName}
			}

			if len(sourceLots) == 0 {
				skipped++
				goto sendProgress
			}

			// Check if there are new quotes since last update (using cached dates)
			if comp.PriceUpdatedAt != nil {
				hasNewData := false
				for _, lot := range sourceLots {
					if latestDate, ok := lotLatestDate[lot]; ok {
						if latestDate.After(*comp.PriceUpdatedAt) {
							hasNewData = true
							break
						}
					}
				}
				if !hasNewData {
					unchanged++
					goto sendProgress
				}
			}

			// Get prices from source lots
			var prices []float64
			if periodDays > 0 {
				h.db.Raw(`SELECT price FROM lot_log WHERE lot IN ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY) ORDER BY price`,
					sourceLots, periodDays).Pluck("price", &prices)
			} else {
				h.db.Raw(`SELECT price FROM lot_log WHERE lot IN ? ORDER BY price`,
					sourceLots).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 IN ? ORDER BY price`, sourceLots).Pluck("price", &prices)
			}

			if len(prices) == 0 {
				skipped++
				goto sendProgress
			}

			// Calculate price based on method
			var basePrice float64
			switch method {
			case models.PriceMethodMedian:
				basePrice = calculateMedian(prices)
			case models.PriceMethodAverage:
				basePrice = calculateAverage(prices)
			default:
				basePrice = calculateMedian(prices)
			}

			if basePrice <= 0 {
				skipped++
				goto sendProgress
			}

			finalPrice := basePrice

			// Apply coefficient
			if comp.PriceCoefficient != 0 {
				finalPrice = finalPrice * (1 + comp.PriceCoefficient/100)
			}

			// Update only price fields
			err := h.db.Model(&models.LotMetadata{}).
				Where("lot_name = ?", comp.LotName).
				Updates(map[string]interface{}{
					"current_price":    finalPrice,
					"price_updated_at": now,
				}).Error
			if err != nil {
				errors++
			} else {
				updated++
			}
		}

	sendProgress:
		// Send progress update every 10 components to reduce overhead
		if progressCounter%10 == 0 || progressCounter == int(total) {
			c.SSEvent("progress", gin.H{
				"current":   updated + skipped + manual + unchanged + errors,
				"total":     total,
				"updated":   updated,
				"skipped":   skipped,
				"manual":    manual,
				"unchanged": unchanged,
				"errors":    errors,
				"status":    "processing",
				"lot_name":  comp.LotName,
			})
			c.Writer.Flush()
		}
	}

	// Update popularity scores
	h.statsRepo.UpdatePopularityScores()

	// Send completion
	c.SSEvent("progress", gin.H{
		"current":   updated + skipped + manual + unchanged + errors,
		"total":     total,
		"updated":   updated,
		"skipped":   skipped,
		"manual":    manual,
		"unchanged": unchanged,
		"errors":    errors,
		"status":    "completed",
	})
	c.Writer.Flush()
}

func (h *PricingHandler) ListAlerts(c *gin.Context) {
	// Check if we're in offline mode
	if h.db == nil {
		c.JSON(http.StatusOK, gin.H{
			"alerts":   []interface{}{},
			"total":    0,
			"page":     1,
			"per_page": 20,
			"offline":  true,
		})
		return
	}

	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	perPage, _ := strconv.Atoi(c.DefaultQuery("per_page", "20"))

	filter := repository.AlertFilter{
		Status:   models.AlertStatus(c.Query("status")),
		Severity: models.AlertSeverity(c.Query("severity")),
		Type:     models.AlertType(c.Query("type")),
		LotName:  c.Query("lot_name"),
	}

	alertsList, total, err := h.alertService.List(filter, page, perPage)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"alerts":   alertsList,
		"total":    total,
		"page":     page,
		"per_page": perPage,
	})
}

func (h *PricingHandler) AcknowledgeAlert(c *gin.Context) {
	// Check if we're in offline mode
	if h.db == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{
			"error":   "Управление алертами доступно только в онлайн режиме",
			"offline": true,
		})
		return
	}

	id, err := strconv.ParseUint(c.Param("id"), 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid alert id"})
		return
	}

	if err := h.alertService.Acknowledge(uint(id)); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "acknowledged"})
}

func (h *PricingHandler) ResolveAlert(c *gin.Context) {
	// Check if we're in offline mode
	if h.db == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{
			"error":   "Управление алертами доступно только в онлайн режиме",
			"offline": true,
		})
		return
	}

	id, err := strconv.ParseUint(c.Param("id"), 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid alert id"})
		return
	}

	if err := h.alertService.Resolve(uint(id)); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "resolved"})
}

func (h *PricingHandler) IgnoreAlert(c *gin.Context) {
	// Check if we're in offline mode
	if h.db == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{
			"error":   "Управление алертами доступно только в онлайн режиме",
			"offline": true,
		})
		return
	}

	id, err := strconv.ParseUint(c.Param("id"), 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid alert id"})
		return
	}

	if err := h.alertService.Ignore(uint(id)); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "ignored"})
}

type PreviewPriceRequest struct {
	LotName     string  `json:"lot_name" binding:"required"`
	Method      string  `json:"method"`
	PeriodDays  int     `json:"period_days"`
	Coefficient float64 `json:"coefficient"`
	MetaEnabled bool    `json:"meta_enabled"`
	MetaPrices  string  `json:"meta_prices"`
}

func (h *PricingHandler) PreviewPrice(c *gin.Context) {
	// Check if we're in offline mode
	if h.db == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{
			"error":   "Предпросмотр цены доступен только в онлайн режиме",
			"offline": true,
		})
		return
	}

	var req PreviewPriceRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// Get component
	var comp models.LotMetadata
	if err := h.db.Where("lot_name = ?", req.LotName).First(&comp).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "component not found"})
		return
	}

	// Determine which lot names to use for price calculation
	lotNames := []string{req.LotName}
	if req.MetaEnabled && req.MetaPrices != "" {
		lotNames = h.expandMetaPrices(req.MetaPrices, req.LotName)
	}

	// Get all prices for calculations (from all relevant lots)
	var allPrices []float64
	for _, lotName := range lotNames {
		var lotPrices []float64
		if strings.HasSuffix(lotName, "*") {
			// Wildcard pattern
			pattern := strings.TrimSuffix(lotName, "*") + "%"
			h.db.Raw(`SELECT price FROM lot_log WHERE lot LIKE ? ORDER BY price`, pattern).Pluck("price", &lotPrices)
		} else {
			h.db.Raw(`SELECT price FROM lot_log WHERE lot = ? ORDER BY price`, lotName).Pluck("price", &lotPrices)
		}
		allPrices = append(allPrices, lotPrices...)
	}

	// Calculate median for all time
	var medianAllTime *float64
	if len(allPrices) > 0 {
		sortFloat64s(allPrices)
		median := calculateMedian(allPrices)
		medianAllTime = &median
	}

	// Get quote count (from all relevant lots) - total count
	var quoteCountTotal int64
	for _, lotName := range lotNames {
		var count int64
		if strings.HasSuffix(lotName, "*") {
			pattern := strings.TrimSuffix(lotName, "*") + "%"
			h.db.Model(&models.LotLog{}).Where("lot LIKE ?", pattern).Count(&count)
		} else {
			h.db.Model(&models.LotLog{}).Where("lot = ?", lotName).Count(&count)
		}
		quoteCountTotal += count
	}

	// Get quote count for specified period (if period is > 0)
	var quoteCountPeriod int64
	if req.PeriodDays > 0 {
		for _, lotName := range lotNames {
			var count int64
			if strings.HasSuffix(lotName, "*") {
				pattern := strings.TrimSuffix(lotName, "*") + "%"
				h.db.Raw(`SELECT COUNT(*) FROM lot_log WHERE lot LIKE ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY)`, pattern, req.PeriodDays).Scan(&count)
			} else {
				h.db.Raw(`SELECT COUNT(*) FROM lot_log WHERE lot = ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY)`, lotName, req.PeriodDays).Scan(&count)
			}
			quoteCountPeriod += count
		}
	} else {
		// If no period specified, period count equals total count
		quoteCountPeriod = quoteCountTotal
	}

	// Get last received price (from the main lot only)
	var lastPrice struct {
		Price *float64
		Date  *time.Time
	}
	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 (method, period, coefficient)
	method := req.Method
	if method == "" {
		method = "median"
	}

	var prices []float64
	if req.PeriodDays > 0 {
		for _, lotName := range lotNames {
			var lotPrices []float64
			if strings.HasSuffix(lotName, "*") {
				pattern := strings.TrimSuffix(lotName, "*") + "%"
				h.db.Raw(`SELECT price FROM lot_log WHERE lot LIKE ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY) ORDER BY price`,
					pattern, req.PeriodDays).Pluck("price", &lotPrices)
			} else {
				h.db.Raw(`SELECT price FROM lot_log WHERE lot = ? AND date >= DATE_SUB(NOW(), INTERVAL ? DAY) ORDER BY price`,
					lotName, req.PeriodDays).Pluck("price", &lotPrices)
			}
			prices = append(prices, lotPrices...)
		}
		// Fall back to all time if no prices in period
		if len(prices) == 0 {
			prices = allPrices
		}
	} else {
		prices = allPrices
	}

	var newPrice *float64
	if len(prices) > 0 {
		sortFloat64s(prices)
		var basePrice float64
		if method == "average" {
			basePrice = calculateAverage(prices)
		} else {
			basePrice = calculateMedian(prices)
		}

		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,
		"new_price":          newPrice,
		"quote_count_total":  quoteCountTotal,
		"quote_count_period": quoteCountPeriod,
		"manual_price":       comp.ManualPrice,
		"last_price":         lastPrice.Price,
		"last_price_date":    lastPrice.Date,
	})
}

// sortFloat64s sorts a slice of float64 in ascending order
func sortFloat64s(data []float64) {
	sort.Float64s(data)
}

// expandMetaPricesWithCache expands meta_prices using pre-loaded lot names (no DB queries)
func expandMetaPricesWithCache(metaPrices, excludeLot string, allLotNames []string) []string {
	sources := strings.Split(metaPrices, ",")
	var result []string
	seen := make(map[string]bool)

	for _, source := range sources {
		source = strings.TrimSpace(source)
		if source == "" || source == excludeLot {
			continue
		}

		if strings.HasSuffix(source, "*") {
			// Wildcard pattern - find matching lots from cache
			prefix := strings.TrimSuffix(source, "*")
			for _, lot := range allLotNames {
				if strings.HasPrefix(lot, prefix) && lot != excludeLot && !seen[lot] {
					result = append(result, lot)
					seen[lot] = true
				}
			}
		} else if !seen[source] {
			result = append(result, source)
			seen[source] = true
		}
	}

	return result
}

func (h *PricingHandler) ImportStockLog(c *gin.Context) {
	if h.stockImportService == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{
			"error":   "Импорт склада доступен только в онлайн режиме",
			"offline": true,
		})
		return
	}

	fileHeader, err := c.FormFile("file")
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "file is required"})
		return
	}

	file, err := fileHeader.Open()
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "failed to open uploaded file"})
		return
	}
	defer file.Close()

	content, err := io.ReadAll(file)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "failed to read uploaded file"})
		return
	}
	modTime := time.Now()
	if statter, ok := file.(interface{ Stat() (os.FileInfo, error) }); ok {
		if st, statErr := statter.Stat(); statErr == nil {
			modTime = st.ModTime()
		}
	}

	flusher, ok := c.Writer.(http.Flusher)
	if !ok {
		result, impErr := h.stockImportService.Import(fileHeader.Filename, content, modTime, h.dbUsername, nil)
		if impErr != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": impErr.Error()})
			return
		}
		c.JSON(http.StatusOK, gin.H{
			"status":                      "completed",
			"rows_total":                  result.RowsTotal,
			"valid_rows":                  result.ValidRows,
			"inserted":                    result.Inserted,
			"deleted":                     result.Deleted,
			"unmapped":                    result.Unmapped,
			"conflicts":                   result.Conflicts,
			"fallback_matches":            result.FallbackMatches,
			"parse_errors":                result.ParseErrors,
			"qty_parse_errors":            result.QtyParseErrors,
			"ignored":                     result.Ignored,
			"mapping_suggestions":         result.MappingSuggestions,
			"import_date":                 result.ImportDate.Format("2006-01-02"),
			"warehouse_pricelist_id":      result.WarehousePLID,
			"warehouse_pricelist_version": result.WarehousePLVer,
		})
		return
	}

	c.Header("Content-Type", "text/event-stream")
	c.Header("Cache-Control", "no-cache")
	c.Header("Connection", "keep-alive")
	c.Header("X-Accel-Buffering", "no")

	send := func(p gin.H) {
		c.SSEvent("progress", p)
		flusher.Flush()
	}

	send(gin.H{"status": "starting", "message": "Запуск импорта"})
	_, impErr := h.stockImportService.Import(fileHeader.Filename, content, modTime, h.dbUsername, func(p services.StockImportProgress) {
		send(gin.H{
			"status":                      p.Status,
			"message":                     p.Message,
			"current":                     p.Current,
			"total":                       p.Total,
			"rows_total":                  p.RowsTotal,
			"valid_rows":                  p.ValidRows,
			"inserted":                    p.Inserted,
			"deleted":                     p.Deleted,
			"unmapped":                    p.Unmapped,
			"conflicts":                   p.Conflicts,
			"fallback_matches":            p.FallbackMatches,
			"parse_errors":                p.ParseErrors,
			"qty_parse_errors":            p.QtyParseErrors,
			"ignored":                     p.Ignored,
			"mapping_suggestions":         p.MappingSuggestions,
			"import_date":                 p.ImportDate,
			"warehouse_pricelist_id":      p.PricelistID,
			"warehouse_pricelist_version": p.PricelistVer,
		})
	})
	if impErr != nil {
		send(gin.H{"status": "error", "message": impErr.Error()})
		return
	}
}

func (h *PricingHandler) ListStockMappings(c *gin.Context) {
	if h.stockImportService == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{
			"error":   "Сопоставления доступны только в онлайн режиме",
			"offline": true,
		})
		return
	}

	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	perPage, _ := strconv.Atoi(c.DefaultQuery("per_page", "50"))
	search := c.Query("search")

	rows, total, err := h.stockImportService.ListMappings(page, perPage, search)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"items":    rows,
		"total":    total,
		"page":     page,
		"per_page": perPage,
	})
}

func (h *PricingHandler) UpsertStockMapping(c *gin.Context) {
	if h.stockImportService == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{
			"error":   "Сопоставления доступны только в онлайн режиме",
			"offline": true,
		})
		return
	}

	var req struct {
		Partnumber  string `json:"partnumber" binding:"required"`
		LotName     string `json:"lot_name"`
		Description string `json:"description"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	if err := h.stockImportService.UpsertMapping(req.Partnumber, req.LotName, req.Description); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"message": "mapping saved"})
}

func (h *PricingHandler) DeleteStockMapping(c *gin.Context) {
	if h.stockImportService == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{
			"error":   "Сопоставления доступны только в онлайн режиме",
			"offline": true,
		})
		return
	}

	partnumber := c.Param("partnumber")
	deleted, err := h.stockImportService.DeleteMapping(partnumber)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"deleted": deleted})
}

func (h *PricingHandler) ListStockIgnoreRules(c *gin.Context) {
	if h.stockImportService == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{
			"error":   "Правила игнорирования доступны только в онлайн режиме",
			"offline": true,
		})
		return
	}

	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	perPage, _ := strconv.Atoi(c.DefaultQuery("per_page", "50"))
	rows, total, err := h.stockImportService.ListIgnoreRules(page, perPage)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"items":    rows,
		"total":    total,
		"page":     page,
		"per_page": perPage,
	})
}

func (h *PricingHandler) UpsertStockIgnoreRule(c *gin.Context) {
	if h.stockImportService == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{
			"error":   "Правила игнорирования доступны только в онлайн режиме",
			"offline": true,
		})
		return
	}
	var req struct {
		Target    string `json:"target" binding:"required"`
		MatchType string `json:"match_type" binding:"required"`
		Pattern   string `json:"pattern" binding:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	if err := h.stockImportService.UpsertIgnoreRule(req.Target, req.MatchType, req.Pattern); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"message": "ignore rule saved"})
}

func (h *PricingHandler) DeleteStockIgnoreRule(c *gin.Context) {
	if h.stockImportService == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{
			"error":   "Правила игнорирования доступны только в онлайн режиме",
			"offline": true,
		})
		return
	}
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil || id == 0 {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid id"})
		return
	}
	deleted, err := h.stockImportService.DeleteIgnoreRule(uint(id))
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"deleted": deleted})
}

type LotTableRow struct {
	LotName        string   `json:"lot_name"`
	LotDescription string   `json:"lot_description"`
	Category       string   `json:"category"`
	Partnumbers    []string `json:"partnumbers"`
	Popularity     float64  `json:"popularity"`
	EstimateCount  int64    `json:"estimate_count"`
	StockQty       *float64 `json:"stock_qty"`
}

func (h *PricingHandler) ListLotsTable(c *gin.Context) {
	if h.db == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{
			"error":   "Список LOT доступен только в онлайн режиме",
			"offline": true,
		})
		return
	}

	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	perPage, _ := strconv.Atoi(c.DefaultQuery("per_page", "50"))
	search := strings.TrimSpace(c.Query("search"))
	sortFieldParam := c.DefaultQuery("sort", "lot_name")
	sortDirParam := strings.ToUpper(c.DefaultQuery("dir", "asc"))

	if page < 1 {
		page = 1
	}
	if perPage < 1 || perPage > 200 {
		perPage = 50
	}
	if sortDirParam != "ASC" && sortDirParam != "DESC" {
		sortDirParam = "ASC"
	}

	type lotRow struct {
		LotName        string   `gorm:"column:lot_name"`
		LotDescription string   `gorm:"column:lot_description"`
		CategoryCode   *string  `gorm:"column:category_code"`
		Popularity     *float64 `gorm:"column:popularity_score"`
	}

	baseQuery := h.db.Table("lot").
		Select("lot.lot_name, lot.lot_description, qt_categories.code as category_code, qt_lot_metadata.popularity_score").
		Joins("LEFT JOIN qt_lot_metadata ON qt_lot_metadata.lot_name = lot.lot_name").
		Joins("LEFT JOIN qt_categories ON qt_categories.id = qt_lot_metadata.category_id")

	if search != "" {
		baseQuery = baseQuery.Where("lot.lot_name LIKE ? OR lot.lot_description LIKE ?", "%"+search+"%", "%"+search+"%")
	}

	var total int64
	if err := baseQuery.Count(&total).Error; err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	allowedDBSorts := map[string]string{
		"lot_name":         "lot.lot_name",
		"category":         "qt_categories.code",
		"popularity_score": "qt_lot_metadata.popularity_score",
	}
	needsComputedSort := sortFieldParam == "estimate_count" || sortFieldParam == "stock_qty"

	var rows []lotRow
	rowsQuery := baseQuery.Session(&gorm.Session{})
	if needsComputedSort {
		rowsQuery = rowsQuery.Order("lot.lot_name ASC")
	} else {
		orderCol, ok := allowedDBSorts[sortFieldParam]
		if !ok {
			orderCol = "lot.lot_name"
		}
		rowsQuery = rowsQuery.Order(orderCol + " " + sortDirParam).Order("lot.lot_name ASC")
		rowsQuery = rowsQuery.Offset((page - 1) * perPage).Limit(perPage)
	}
	if err := rowsQuery.Find(&rows).Error; err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	if len(rows) == 0 {
		c.JSON(http.StatusOK, gin.H{
			"lots":     []LotTableRow{},
			"total":    total,
			"page":     page,
			"per_page": perPage,
		})
		return
	}

	// Collect lot names for batch subqueries
	lotNames := make([]string, len(rows))
	for i, r := range rows {
		lotNames[i] = r.LotName
	}

	type countRow struct {
		Lot   string `gorm:"column:lot"`
		Count int64  `gorm:"column:cnt"`
	}
	var estimateCounts []countRow
	if err := h.db.Raw("SELECT lot, COUNT(*) as cnt FROM lot_log WHERE lot IN ? GROUP BY lot", lotNames).Scan(&estimateCounts).Error; err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	estimateMap := make(map[string]int64, len(estimateCounts))
	for _, ec := range estimateCounts {
		estimateMap[ec.Lot] = ec.Count
	}

	stockQtyByLot, pnMap, err := warehouse.LoadLotMetrics(h.db, lotNames, true)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	result := make([]LotTableRow, len(rows))
	for i, r := range rows {
		cat := ""
		if r.CategoryCode != nil {
			cat = *r.CategoryCode
		}
		pop := 0.0
		if r.Popularity != nil {
			pop = *r.Popularity
		}
		result[i] = LotTableRow{
			LotName:        r.LotName,
			LotDescription: r.LotDescription,
			Category:       cat,
			Partnumbers:    pnMap[r.LotName],
			Popularity:     pop,
			EstimateCount:  estimateMap[r.LotName],
		}
		if qty, ok := stockQtyByLot[r.LotName]; ok {
			q := qty
			result[i].StockQty = &q
		}
		if result[i].Partnumbers == nil {
			result[i].Partnumbers = []string{}
		}
	}

	if needsComputedSort {
		sort.SliceStable(result, func(i, j int) bool {
			if sortFieldParam == "estimate_count" {
				if result[i].EstimateCount == result[j].EstimateCount {
					if sortDirParam == "DESC" {
						return result[i].LotName > result[j].LotName
					}
					return result[i].LotName < result[j].LotName
				}
				if sortDirParam == "DESC" {
					return result[i].EstimateCount > result[j].EstimateCount
				}
				return result[i].EstimateCount < result[j].EstimateCount
			}
			qi := 0.0
			if result[i].StockQty != nil {
				qi = *result[i].StockQty
			}
			qj := 0.0
			if result[j].StockQty != nil {
				qj = *result[j].StockQty
			}
			if qi == qj {
				if sortDirParam == "DESC" {
					return result[i].LotName > result[j].LotName
				}
				return result[i].LotName < result[j].LotName
			}
			if sortDirParam == "DESC" {
				return qi > qj
			}
			return qi < qj
		})

		start := (page - 1) * perPage
		if start >= len(result) {
			result = []LotTableRow{}
		} else {
			end := start + perPage
			if end > len(result) {
				end = len(result)
			}
			result = result[start:end]
		}
	}

	c.JSON(http.StatusOK, gin.H{
		"lots":     result,
		"total":    total,
		"page":     page,
		"per_page": perPage,
	})
}

func (h *PricingHandler) ListLots(c *gin.Context) {
	if h.db == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{
			"error":   "Список LOT доступен только в онлайн режиме",
			"offline": true,
		})
		return
	}
	perPage, _ := strconv.Atoi(c.DefaultQuery("per_page", "500"))
	if perPage < 1 {
		perPage = 500
	}
	if perPage > 5000 {
		perPage = 5000
	}
	search := strings.TrimSpace(c.Query("search"))
	query := h.db.Model(&models.Lot{}).Select("lot_name")
	if search != "" {
		query = query.Where("lot_name LIKE ?", "%"+search+"%")
	}
	var lots []models.Lot
	if err := query.Order("lot_name ASC").Limit(perPage).Find(&lots).Error; err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	items := make([]string, 0, len(lots))
	for _, lot := range lots {
		if strings.TrimSpace(lot.LotName) == "" {
			continue
		}
		items = append(items, lot.LotName)
	}
	c.JSON(http.StatusOK, gin.H{"items": items})
}