feat: ios mobil arayüz tasarımı

ios/Bookibra/ViewModels/AddBooksViewModel.swift

@@ -0,0 +1,88 @@
+import Foundation
+
+@MainActor
+final class AddBooksViewModel: ObservableObject {
+    enum Mode: String, CaseIterable {
+        case title
+        case scan
+        case filter
+
+        var title: String {
+            switch self {
+            case .title: return String(localized: "add.searchByTitle")
+            case .scan: return String(localized: "add.scanBarcode")
+            case .filter: return String(localized: "add.filter")
+            }
+        }
+    }
+
+    @Published var mode: Mode = .title
+    @Published var titleQuery = ""
+    @Published var filterTitle = ""
+    @Published var filterYear = ""
+    @Published var results: [BookRemote] = []
+    @Published var isLoading = false
+    @Published var errorMessage: String?
+
+    private var debounceTask: Task<Void, Never>?
+    private let booksService: BooksServiceProtocol
+
+    init(booksService: BooksServiceProtocol) {
+        self.booksService = booksService
+    }
+
+    func titleChanged() {
+        debounceTask?.cancel()
+
+        let query = titleQuery.trimmingCharacters(in: .whitespacesAndNewlines)
+        guard query.count >= 2 else {
+            results = []
+            return
+        }
+
+        debounceTask = Task {
+            try? await Task.sleep(for: .milliseconds(400))
+            await searchByTitle(query)
+        }
+    }
+
+    func searchByTitle(_ query: String? = nil) async {
+        let value = query ?? titleQuery
+        guard !value.isEmpty else { return }
+        isLoading = true
+        defer { isLoading = false }
+
+        do {
+            results = try await booksService.searchByTitle(value, locales: "tr,en")
+            errorMessage = nil
+        } catch {
+            errorMessage = error.localizedDescription
+        }
+    }
+
+    func searchByISBN(_ isbn: String) async {
+        guard !isbn.isEmpty else { return }
+        isLoading = true
+        defer { isLoading = false }
+
+        do {
+            results = try await booksService.searchByISBN(isbn, locales: "tr,en")
+            errorMessage = nil
+        } catch {
+            errorMessage = error.localizedDescription
+        }
+    }
+
+    func applyFilter() async {
+        guard !filterTitle.isEmpty, !filterYear.isEmpty else { return }
+        isLoading = true
+        defer { isLoading = false }
+
+        do {
+            results = try await booksService.filter(title: filterTitle, year: filterYear, locales: "tr,en")
+            errorMessage = nil
+        } catch {
+            errorMessage = error.localizedDescription
+        }
+    }
+}