[Local Catalog] Update barcode scanning to use local catalog

Modules/Sources/Storage/GRDB/Model/PersistedProduct.swift

@@ -100,6 +100,17 @@ public extension PersistedProduct {
             .filter(Columns.downloadable == false)
             .order(Columns.name.collating(.localizedCaseInsensitiveCompare))
     }
+
+    /// Searches for a POS-supported product by global unique ID
+    /// - Parameters:
+    ///   - siteID: The site ID
+    ///   - globalUniqueID: The global unique ID (barcode) to search for
+    /// - Returns: A query request that matches products with the given global unique ID
+    static func posProductByGlobalUniqueID(siteID: Int64, globalUniqueID: String) -> QueryInterfaceRequest<PersistedProduct> {
+        return PersistedProduct
+            .filter(Columns.siteID == siteID)
+            .filter(Columns.globalUniqueID == globalUniqueID)
+    }
 }
 
 // periphery:ignore - TODO: remove ignore when populating database

Modules/Sources/Storage/GRDB/Model/PersistedProductVariation.swift

@@ -78,17 +78,34 @@ extension PersistedProductVariation: FetchableRecord, PersistableRecord {
                                      through: productVariationImage,
                                      using: PersistedProductVariationImage.image,
                                      key: "image")
+
+    // Relationship to parent product
+    public static let parentProduct = belongsTo(PersistedProduct.self,
+                                                using: ForeignKey([Columns.siteID, Columns.productID],
+                                                                 to: [PersistedProduct.Columns.siteID, PersistedProduct.Columns.id]))
 }
 
 // MARK: - Point of Sale Requests
 public extension PersistedProductVariation {
     /// Returns a request for non-downloadable variations of a parent product, ordered by ID
     static func posVariationsRequest(siteID: Int64, parentProductID: Int64) -> QueryInterfaceRequest<PersistedProductVariation> {
         return PersistedProductVariation
-            .filter(Columns.siteID == siteID && Columns.productID == parentProductID)
+            .filter(Columns.siteID == siteID)
+            .filter(Columns.productID == parentProductID)
             .filter(Columns.downloadable == false)
             .order(Columns.id)
     }
+
+    /// Searches for a POS-supported variation by global unique ID
+    /// - Parameters:
+    ///   - siteID: The site ID
+    ///   - globalUniqueID: The global unique ID (barcode) to search for
+    /// - Returns: A query request that matches variations with the given global unique ID
+    static func posVariationByGlobalUniqueID(siteID: Int64, globalUniqueID: String) -> QueryInterfaceRequest<PersistedProductVariation> {
+        return PersistedProductVariation
+            .filter(Columns.siteID == siteID)
+            .filter(Columns.globalUniqueID == globalUniqueID)
+    }
 }
 
 // periphery:ignore - TODO: remove ignore when populating database

Modules/Sources/Yosemite/PointOfSale/Items/PointOfSaleLocalBarcodeScanService.swift

@@ -0,0 +1,141 @@
+import Foundation
+import protocol Storage.GRDBManagerProtocol
+import class WooFoundation.CurrencySettings
+
+/// Service for handling barcode scanning using local GRDB catalog
+public final class PointOfSaleLocalBarcodeScanService: PointOfSaleBarcodeScanServiceProtocol {
+    private let grdbManager: GRDBManagerProtocol
+    private let siteID: Int64
+    private let itemMapper: PointOfSaleItemMapperProtocol
+
+    public init(siteID: Int64,
+                grdbManager: GRDBManagerProtocol,
+                currencySettings: CurrencySettings,
+                itemMapper: PointOfSaleItemMapperProtocol? = nil) {
+        self.siteID = siteID
+        self.grdbManager = grdbManager
+        self.itemMapper = itemMapper ?? PointOfSaleItemMapper(currencySettings: currencySettings)
+    }
+
+    /// Looks up a POSItem using a barcode scan string from the local GRDB catalog
+    /// - Parameter barcode: The barcode string from a scan (global unique identifier)
+    /// - Returns: A POSItem if found, or throws an error
+    public func getItem(barcode: String) async throws(PointOfSaleBarcodeScanError) -> POSItem {
+        do {
+            if let product = try searchProductByGlobalUniqueID(barcode) {
+                return try convertProductToItem(product, scannedCode: barcode)
+            }
+
+            if let variationAndParent = try searchVariationByGlobalUniqueID(barcode) {
+                return try convertVariationToItem(variationAndParent.variation, parentProduct: variationAndParent.parentProduct, scannedCode: barcode)
+            }
+
+            throw PointOfSaleBarcodeScanError.notFound(scannedCode: barcode)
+        } catch let error as PointOfSaleBarcodeScanError {
+            throw error
+        } catch {
+            throw PointOfSaleBarcodeScanError.loadingError(scannedCode: barcode, underlyingError: error)
+        }
+    }
+
+    // MARK: - Product Search
+
+    private func searchProductByGlobalUniqueID(_ globalUniqueID: String) throws -> PersistedProduct? {
+        try grdbManager.databaseConnection.read { db in
+            try PersistedProduct.posProductByGlobalUniqueID(siteID: siteID, globalUniqueID: globalUniqueID).fetchOne(db)
+        }
+    }
+
+    // MARK: - Variation Search
+
+    private func searchVariationByGlobalUniqueID(_ globalUniqueID: String) throws -> (variation: PersistedProductVariation, parentProduct: PersistedProduct)? {
+        try grdbManager.databaseConnection.read { db in
+            guard let variation = try PersistedProductVariation.posVariationByGlobalUniqueID(siteID: siteID, globalUniqueID: globalUniqueID).fetchOne(db) else {
+                return nil
+            }
+            // Fetch parent product using the relationship
+            guard let parentProduct = try variation.request(for: PersistedProductVariation.parentProduct).fetchOne(db) else {
+                throw PointOfSaleBarcodeScanError.noParentProductForVariation(scannedCode: globalUniqueID)
+            }
+            return (variation, parentProduct)
+        }
+    }
+
+    // MARK: - Conversion to POSItem
+
+    private func convertProductToItem(_ persistedProduct: PersistedProduct, scannedCode: String) throws(PointOfSaleBarcodeScanError) -> POSItem {
+        do {
+            let posProduct = try persistedProduct.toPOSProduct(db: grdbManager.databaseConnection)
+
+            guard !posProduct.downloadable else {
+                throw PointOfSaleBarcodeScanError.downloadableProduct(scannedCode: scannedCode, productName: posProduct.name)
+            }
+
+            // Validate product type - only simple products can be scanned directly
+            // Variable parent products cannot be added to cart (only their variations can)
+            guard posProduct.productType == .simple else {
+                throw PointOfSaleBarcodeScanError.unsupportedProductType(
+                    scannedCode: scannedCode,
+                    productName: posProduct.name,
+                    productType: posProduct.productType
+                )
+            }
+
+            // Convert to POSItem
+            let items = itemMapper.mapProductsToPOSItems(products: [posProduct])
+            guard let item = items.first else {
+                throw PointOfSaleBarcodeScanError.unknown(scannedCode: scannedCode)
+            }
+
+            return item
+        } catch let error as PointOfSaleBarcodeScanError {
+            throw error
+        } catch {
+            throw PointOfSaleBarcodeScanError.mappingError(scannedCode: scannedCode, underlyingError: error)
+        }
+    }
+
+    private func convertVariationToItem(_ persistedVariation: PersistedProductVariation,
+                                        parentProduct: PersistedProduct,
+                                        scannedCode: String) throws(PointOfSaleBarcodeScanError) -> POSItem {
+        do {
+            // Convert both variation and parent to POS models
+            let posVariation = try persistedVariation.toPOSProductVariation(db: grdbManager.databaseConnection)
+            let parentPOSProduct = try parentProduct.toPOSProduct(db: grdbManager.databaseConnection)
+
+            // Map to POSItem
+            guard let mappedParent = itemMapper.mapProductsToPOSItems(products: [parentPOSProduct]).first,
+                  case .variableParentProduct(let variableParentProduct) = mappedParent,
+                  let item = itemMapper.mapVariationsToPOSItems(variations: [posVariation], parentProduct: variableParentProduct).first else {
+                throw PointOfSaleBarcodeScanError.variationCouldNotBeConverted(scannedCode: scannedCode)
+            }
+
+            guard !persistedVariation.downloadable else {
+                throw PointOfSaleBarcodeScanError.downloadableProduct(scannedCode: scannedCode,
+                                                                      productName: variationName(for: item))
+            }
+
+            return item
+        } catch let error as PointOfSaleBarcodeScanError {
+            throw error
+        } catch {
+            throw PointOfSaleBarcodeScanError.mappingError(scannedCode: scannedCode, underlyingError: error)
+        }
+    }
+
+    private func variationName(for item: POSItem) -> String {
+        guard case .variation(let posVariation) = item else {
+            return Localization.unknownVariationName
+        }
+        return posVariation.name
+    }
+}
+
+private extension PointOfSaleLocalBarcodeScanService {
+    enum Localization {
+        static let unknownVariationName = NSLocalizedString(
+            "pointOfSale.barcodeScanning.unresolved.variation.name",
+            value: "Unknown",
+            comment: "A placeholder name when we can't determine the name of a variation for an error message")
+    }
+}

Modules/Tests/StorageTests/GRDB/PersistedProductBarcodeQueryTests.swift

@@ -0,0 +1,135 @@
+import Foundation
+import Testing
+@testable import Storage
+
+@Suite("PersistedProduct Barcode Query Tests")
+struct PersistedProductBarcodeQueryTests {
+    private let siteID: Int64 = 123
+    private var grdbManager: GRDBManager!
+
+    init() async throws {
+        grdbManager = try GRDBManager()
+
+        // Initialize site
+        try await grdbManager.databaseConnection.write { db in
+            try PersistedSite(id: siteID).insert(db)
+        }
+    }
+
+    // MARK: - Global Unique ID Query Tests
+
+    @Test("posProductByGlobalUniqueID finds product with matching global unique ID")
+    func test_finds_product_by_global_unique_id() async throws {
+        // Given
+        let globalUniqueID = "UPC-123456"
+        let product = PersistedProduct(
+            id: 1,
+            siteID: siteID,
+            name: "Test Product",
+            productTypeKey: "simple",
+            fullDescription: nil,
+            shortDescription: nil,
+            sku: "SKU-001",
+            globalUniqueID: globalUniqueID,
+            price: "10.00",
+            downloadable: false,
+            parentID: 0,
+            manageStock: false,
+            stockQuantity: nil,
+            stockStatusKey: "instock"
+        )
+        try await insertProduct(product)
+
+        // When
+        let result = try await grdbManager.databaseConnection.read { db in
+            try PersistedProduct.posProductByGlobalUniqueID(siteID: siteID, globalUniqueID: globalUniqueID).fetchOne(db)
+        }
+
+        // Then
+        #expect(result != nil)
+        #expect(result?.id == 1)
+        #expect(result?.name == "Test Product")
+        #expect(result?.globalUniqueID == globalUniqueID)
+    }
+
+    @Test("posProductByGlobalUniqueID returns nil when no match")
+    func test_returns_nil_when_no_global_unique_id_match() async throws {
+        // When
+        let result = try await grdbManager.databaseConnection.read { db in
+            try PersistedProduct.posProductByGlobalUniqueID(siteID: siteID, globalUniqueID: "NONEXISTENT").fetchOne(db)
+        }
+
+        // Then
+        #expect(result == nil)
+    }
+
+    // MARK: - Site Isolation Tests
+
+    @Test("Queries only return products from specified site")
+    func test_queries_respect_site_isolation() async throws {
+        // Given
+        let otherSiteID: Int64 = 456
+        let barcode = "SHARED-BARCODE"
+
+        // Insert site
+        try await grdbManager.databaseConnection.write { db in
+            try PersistedSite(id: otherSiteID).insert(db)
+        }
+
+        // Insert product for our site
+        let ourProduct = PersistedProduct(
+            id: 7,
+            siteID: siteID,
+            name: "Our Product",
+            productTypeKey: "simple",
+            fullDescription: nil,
+            shortDescription: nil,
+            sku: barcode,
+            globalUniqueID: barcode,
+            price: "10.00",
+            downloadable: false,
+            parentID: 0,
+            manageStock: false,
+            stockQuantity: nil,
+            stockStatusKey: "instock"
+        )
+
+        // Insert product for other site
+        let otherProduct = PersistedProduct(
+            id: 8,
+            siteID: otherSiteID,
+            name: "Other Site Product",
+            productTypeKey: "simple",
+            fullDescription: nil,
+            shortDescription: nil,
+            sku: barcode,
+            globalUniqueID: barcode,
+            price: "20.00",
+            downloadable: false,
+            parentID: 0,
+            manageStock: false,
+            stockQuantity: nil,
+            stockStatusKey: "instock"
+        )
+
+        try await insertProduct(ourProduct)
+        try await insertProduct(otherProduct)
+
+        // When
+        let resultByGlobalID = try await grdbManager.databaseConnection.read { db in
+            try PersistedProduct.posProductByGlobalUniqueID(siteID: siteID, globalUniqueID: barcode).fetchOne(db)
+        }
+
+        // Then
+        #expect(resultByGlobalID?.siteID == siteID)
+        #expect(resultByGlobalID?.id == 7)
+    }
+
+    // MARK: - Helper Methods
+
+    private func insertProduct(_ product: PersistedProduct) async throws {
+        try await grdbManager.databaseConnection.write { db in
+            try product.insert(db)
+        }
+    }
+}