package main

import (
	"flag"
	"log"
	"strings"

	"git.mchus.pro/mchus/priceforge/internal/config"
	"git.mchus.pro/mchus/priceforge/internal/models"
	"gorm.io/driver/mysql"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

func main() {
	configPath := flag.String("config", "config.yaml", "path to config file")
	flag.Parse()

	cfg, err := config.Load(*configPath)
	if err != nil {
		log.Fatalf("Failed to load config: %v", err)
	}

	db, err := gorm.Open(mysql.Open(cfg.Database.DSN()), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Silent),
	})
	if err != nil {
		log.Fatalf("Failed to connect to database: %v", err)
	}

	log.Println("Connected to database")

	// Ensure tables exist
	if err := models.Migrate(db); err != nil {
		log.Fatalf("Migration failed: %v", err)
	}
	if err := models.SeedCategories(db); err != nil {
		log.Fatalf("Seeding categories failed: %v", err)
	}

	// Load categories for lookup
	var categories []models.Category
	db.Find(&categories)
	categoryMap := make(map[string]uint)
	for _, c := range categories {
		categoryMap[c.Code] = c.ID
	}
	log.Printf("Loaded %d categories", len(categories))

	// Get all lots
	var lots []models.Lot
	if err := db.Find(&lots).Error; err != nil {
		log.Fatalf("Failed to load lots: %v", err)
	}
	log.Printf("Found %d lots to import", len(lots))

	// Import each lot
	var imported, skipped, updated int
	for _, lot := range lots {
		category, model := ParsePartNumber(lot.LotName)

		var categoryID *uint
		if id, ok := categoryMap[category]; ok && id > 0 {
			categoryID = &id
		} else {
			// Try to find by prefix match
			for code, id := range categoryMap {
				if strings.HasPrefix(category, code) {
					categoryID = &id
					break
				}
			}
		}

		// Check if already exists
		var existing models.LotMetadata
		result := db.Where("lot_name = ?", lot.LotName).First(&existing)

		if result.Error == gorm.ErrRecordNotFound {
			// Check if there are prices in the last 90 days
			var recentPriceCount int64
			db.Model(&models.LotLog{}).
				Where("lot = ? AND date >= DATE_SUB(NOW(), INTERVAL 90 DAY)", lot.LotName).
				Count(&recentPriceCount)

			// Default to 90 days, but use "all time" (0) if no recent prices
			periodDays := 90
			if recentPriceCount == 0 {
				periodDays = 0
			}

			// Create new
			metadata := models.LotMetadata{
				LotName:         lot.LotName,
				CategoryID:      categoryID,
				Model:           model,
				PricePeriodDays: periodDays,
			}
			if err := db.Create(&metadata).Error; err != nil {
				log.Printf("Failed to create metadata for %s: %v", lot.LotName, err)
				continue
			}
			imported++
		} else if result.Error == nil {
			// Update if needed
			needsUpdate := false

			if existing.Model == "" {
				existing.Model = model
				needsUpdate = true
			}
			if existing.CategoryID == nil {
				existing.CategoryID = categoryID
				needsUpdate = true
			}

			// Check if using default period (90 days) but no recent prices
			if existing.PricePeriodDays == 90 {
				var recentPriceCount int64
				db.Model(&models.LotLog{}).
					Where("lot = ? AND date >= DATE_SUB(NOW(), INTERVAL 90 DAY)", lot.LotName).
					Count(&recentPriceCount)

				if recentPriceCount == 0 {
					existing.PricePeriodDays = 0
					needsUpdate = true
				}
			}

			if needsUpdate {
				db.Save(&existing)
				updated++
			} else {
				skipped++
			}
		}
	}

	log.Printf("Import complete: %d imported, %d updated, %d skipped", imported, updated, skipped)

	// Show final counts
	var metadataCount int64
	db.Model(&models.LotMetadata{}).Count(&metadataCount)
	log.Printf("Total metadata records: %d", metadataCount)
}

// ParsePartNumber extracts category and model from lot_name
// Examples:
// "CPU_AMD_9654" → category="CPU", model="AMD_9654"
// "MB_INTEL_4.Sapphire_2S" → category="MB", model="INTEL_4.Sapphire_2S"
func ParsePartNumber(lotName string) (category, model string) {
	parts := strings.SplitN(lotName, "_", 2)
	if len(parts) >= 1 {
		category = parts[0]
	}
	if len(parts) >= 2 {
		model = parts[1]
	}
	return
}