// SwiftUI -- automatically extracted (LocalizedStringKey)
Text("Welcome back")              // key: "Welcome back"
Label("Settings", systemImage: "gear")
Button("Save") { }
Toggle("Dark Mode", isOn: $dark)

// Programmatic -- automatically extracted
String(localized: "No items found")
LocalizedStringResource("Order placed")

// NOT extracted -- plain String, not localized
let msg = "Hello"                 // just a String, invisible to Xcode

// These all create a LocalizedStringKey lookup automatically:
Text("Welcome back")
Label("Profile", systemImage: "person")
Button("Delete") { deleteItem() }
.navigationTitle("Home")

// Basic
let title = String(localized: "Welcome back")

// With default value (key differs from English text)
let msg = String(localized: "error.network",
                 defaultValue: "Check your internet connection")

// With table and bundle
let label = String(localized: "onboarding.title",
                   table: "Onboarding",
                   bundle: .module)

// With comment for translators
let btn = String(localized: "Save",
                 comment: "Button title to save the current document")

// App Intents require LocalizedStringResource
struct OrderCoffeeIntent: AppIntent {
    static var title: LocalizedStringResource = "Order Coffee"
}

// Widgets
struct MyWidget: Widget {
    var body: some WidgetConfiguration {
        StaticConfiguration(kind: "timer",
                            provider: Provider()) { entry in
            TimerView(entry: entry)
        }
        .configurationDisplayName(LocalizedStringResource("Timer"))
    }
}

// Pass around without resolving yet
func showAlert(title: LocalizedStringResource, message: LocalizedStringResource) {
    // Resolved at display time with the user's current locale
    let resolved = String(localized: title)
}

// English: "Welcome, Alice! You have 3 new messages."
// German:  "Willkommen, Alice! Sie haben 3 neue Nachrichten."
// Japanese: "Alice さん、新しいメッセージが 3 件あります。"
let text = String(localized: "Welcome, \(name)! You have \(count) new messages.")

// Interpolation provides type safety
String(localized: "Score: \(score, format: .number)")
String(localized: "Due: \(date, format: .dateTime.month().day())")

// Code -- single interpolation triggers plural support
Text("\(unreadCount) unread messages")

// String Catalog entries (English):
//   one:   "%lld unread message"
//   other: "%lld unread messages"

// In String Catalog editor, enable "Vary by Device" for a key
// iPhone: "Tap to continue"
// iPad:   "Tap or click to continue"
// Mac:    "Click to continue"

// Automatically adjusts for gender/number in supported languages
Text("^[\(count) \("photo")](inflect: true) added")
// English: "1 photo added" / "3 photos added"
// Spanish: "1 foto agregada" / "3 fotos agregadas"

let now = Date.now

// Preset styles
now.formatted(date: .long, time: .shortened)
// US: "January 15, 2026 at 3:30 PM"
// DE: "15. Januar 2026 um 15:30"
// JP: "2026年1月15日 15:30"

// Component-based
now.formatted(.dateTime.month(.wide).day().year())
// US: "January 15, 2026"

// In SwiftUI
Text(now, format: .dateTime.month().day().year())

let count = 1234567
count.formatted()                     // "1,234,567" (US) / "1.234.567" (DE)
count.formatted(.number.precision(.fractionLength(2)))
count.formatted(.percent)             // For 0.85 -> "85%" (US) / "85 %" (FR)

// Currency
let price = Decimal(29.99)
price.formatted(.currency(code: "USD"))  // "$29.99" (US) / "29,99 $US" (FR)
price.formatted(.currency(code: "EUR"))  // "29,99 EUR" (DE)

let distance = Measurement(value: 5, unit: UnitLength.kilometers)
distance.formatted(.measurement(width: .wide))
// US: "3.1 miles" (auto-converts!) / DE: "5 Kilometer"

let temp = Measurement(value: 22, unit: UnitTemperature.celsius)
temp.formatted(.measurement(width: .abbreviated))
// US: "72 F" (auto-converts!) / FR: "22 C"

// Duration
let dur = Duration.seconds(3661)
dur.formatted(.time(pattern: .hourMinuteSecond))  // "1:01:01"

// Person names
let name = PersonNameComponents(givenName: "John", familyName: "Doe")
name.formatted(.name(style: .long))   // "John Doe" (US) / "Doe John" (JP)

// Lists
let items = ["Apples", "Oranges", "Bananas"]
items.formatted(.list(type: .and))    // "Apples, Oranges, and Bananas" (EN)
                                      // "Apples, Oranges et Bananas" (FR)

// Testing RTL in previews
MyView()
    .environment(\.layoutDirection, .rightToLeft)
    .environment(\.locale, Locale(identifier: "ar"))

// Images that should mirror (directional arrows, progress indicators)
Image(systemName: "chevron.right")
    .flipsForRightToLeftLayoutDirection(true)

// Images that should NOT mirror: logos, photos, clocks, music notes

// Forced LTR for specific content (phone numbers, code)
Text("+1 (555) 123-4567")
    .environment(\.layoutDirection, .leftToRight)

// WRONG -- legacy API, verbose, no compiler integration with String Catalogs
let title = NSLocalizedString("welcome_title", comment: "Welcome screen title")

// CORRECT
let title = String(localized: "welcome_title",
                   defaultValue: "Welcome!",
                   comment: "Welcome screen title")
// Or in SwiftUI, just:
Text("Welcome!")

// WRONG -- word order varies by language
let greeting = String(localized: "Hello") + ", " + name + "!"

// CORRECT -- translators can reorder placeholders
let greeting = String(localized: "Hello, \(name)!")

// WRONG -- US-only format
let formatter = DateFormatter()
formatter.dateFormat = "MM/dd/yyyy"  // Meaningless in most countries

// CORRECT -- adapts to user locale
Text(date, format: .dateTime.month().day().year())

// WRONG -- German text is ~30% longer than English
Text(title).frame(width: 120)

// CORRECT
Text(title).fixedSize(horizontal: false, vertical: true)
// Or use VStack/wrapping that accommodates expansion

// WRONG -- does not flip for RTL
HStack { Spacer(); text }.padding(.left, 16)

// CORRECT
HStack { Spacer(); text }.padding(.leading, 16)

// WRONG -- not localized
let errorMessage = "Something went wrong"
showAlert(message: errorMessage)

// CORRECT
let errorMessage = LocalizedStringResource("Something went wrong")
showAlert(message: String(localized: errorMessage))