import Foundation

enum CurrencyCode: String, CaseIterable, Codable {
    case usd = "USD"
    case eur = "EUR"
    
    var symbol: String {
        switch self {
        case .usd: return "$"
        case .eur: return "€"
        }
    }
    
    var scryfallKey: String {
        switch self {
        case .usd: return "usd"
        case .eur: return "eur"
        }
    }
}

struct AppConfig {
    // 1. CONTACT EMAIL (Required by Scryfall API policy)
    // Replace with your real developer email before submitting to the App Store.
    static let contactEmail = "support@iymtg.com" // TODO: Replace with your real email

    // 2. IN-APP PURCHASE ID (Use a "Consumable" type in App Store Connect for repeatable tips)
    static let tipJarProductIDs: [String] = [] // Example: Use your real Product ID

    // 3. VERSIONING
    static let appVersion = "1.1.0" // Follows Semantic Versioning (Major.Minor.Patch)
    static let buildNumber = "2"      // Increments with each build submitted to App Store Connect
    
    // Feature Flags
    static let enableFoilDetection = true
    static let enableConditionGrading = true
    static let enableSetSymbolDetection = true
    static let enableStampDetection = true
    static let defaultCurrency: CurrencyCode = .usd
    
    struct Defaults {
        static let masterCollectionName = "Master Collection"
        static let unsortedBoxName = "Unsorted"
        static let defaultCondition = "Near Mint (NM)"
        static let defaultFoil = "None"
    }
    
    static var isTrainingOptIn: Bool {
        get { UserDefaults.standard.bool(forKey: "TrainingOptIn") }
        set { UserDefaults.standard.set(newValue, forKey: "TrainingOptIn") }
    }

    // Firebase secondary backup — metadata only (no card images).
    // Default: false. Users opt-in via the Cloud Backup section in Library settings.
    static var isFirebaseBackupEnabled: Bool {
        get { UserDefaults.standard.bool(forKey: "FirebaseBackupEnabled") }
        set { UserDefaults.standard.set(newValue, forKey: "FirebaseBackupEnabled") }
    }
    
    static var scryfallUserAgent: String {
        return "IYmtg/\(appVersion) (\(contactEmail))"
    }
    
    static func validate() {
        #if DEBUG
        let knownPlaceholderDomains = ["yourdomain.com", "example.com", "yourapp.com"]
        if knownPlaceholderDomains.contains(where: { contactEmail.contains($0) }) || contactEmail.isEmpty {
            fatalError("🛑 SETUP ERROR: Change 'contactEmail' in AppConfig.swift to your real email.")
        }
        if tipJarProductIDs.isEmpty {
            print("⚠️ CONFIG WARNING: 'tipJarProductIDs' is empty. Tip Jar will not be available.")
        } else if let first = tipJarProductIDs.first, (first.contains("yourname") || first == "com.iymtg.app.tip") {
            print("⚠️ CONFIG WARNING: 'tipJarProductIDs' contains placeholder. IAP will not load.")
        }
        #endif
    }
}