refactor lot matching into shared module

internal/services/pricelist/service_warehouse_test.go

@@ -0,0 +1,72 @@
+package pricelist
+
+import (
+	"math"
+	"testing"
+	"time"
+
+	"git.mchus.pro/mchus/quoteforge/internal/models"
+	"git.mchus.pro/mchus/quoteforge/internal/repository"
+	"github.com/glebarez/sqlite"
+	"gorm.io/gorm"
+)
+
+func TestCreateWarehousePricelistFromStockLog(t *testing.T) {
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("open sqlite: %v", err)
+	}
+
+	if err := db.AutoMigrate(
+		&models.Pricelist{},
+		&models.PricelistItem{},
+		&models.StockLog{},
+		&models.Lot{},
+		&models.LotPartnumber{},
+	); err != nil {
+		t.Fatalf("automigrate: %v", err)
+	}
+
+	if err := db.Create(&models.Lot{LotName: "CPU_X", LotDescription: "CPU"}).Error; err != nil {
+		t.Fatalf("seed lot: %v", err)
+	}
+	if err := db.Create(&models.LotPartnumber{Partnumber: "PN-CPU-X", LotName: "CPU_X"}).Error; err != nil {
+		t.Fatalf("seed mapping: %v", err)
+	}
+
+	qty1 := 2.0
+	qty2 := 8.0
+	now := time.Now()
+	rows := []models.StockLog{
+		{Partnumber: "PN-CPU-X", Date: now, Price: 100, Qty: &qty1},
+		{Partnumber: "PN-CPU-X", Date: now, Price: 200, Qty: &qty2},
+	}
+	if err := db.Create(&rows).Error; err != nil {
+		t.Fatalf("seed stock log: %v", err)
+	}
+
+	repo := repository.NewPricelistRepository(db)
+	svc := NewService(db, repo, nil, nil)
+
+	pl, err := svc.CreateForSourceWithProgress("tester", string(models.PricelistSourceWarehouse), nil, nil)
+	if err != nil {
+		t.Fatalf("create warehouse pricelist: %v", err)
+	}
+	if pl.Source != string(models.PricelistSourceWarehouse) {
+		t.Fatalf("unexpected source: %s", pl.Source)
+	}
+
+	var items []models.PricelistItem
+	if err := db.Where("pricelist_id = ?", pl.ID).Find(&items).Error; err != nil {
+		t.Fatalf("load pricelist items: %v", err)
+	}
+	if len(items) != 1 {
+		t.Fatalf("expected 1 item, got %d", len(items))
+	}
+	if items[0].LotName != "CPU_X" {
+		t.Fatalf("unexpected lot name: %s", items[0].LotName)
+	}
+	if math.Abs(items[0].Price-200) > 0.001 {
+		t.Fatalf("expected weighted median price 200, got %f", items[0].Price)
+	}
+}