import Foundation

enum AppLanguage: String, CaseIterable {
    case pl, en

    static var initial: AppLanguage {
        if let saved = UserDefaults.standard.string(forKey: "language"), let language = AppLanguage(rawValue: saved) {
            return language
        }
        return Locale.current.language.languageCode?.identifier == "pl" ? .pl : .en
    }
}

struct UserProfile: Codable, Equatable {
    var id: Int?
    var username: String?
    var email: String?
    var firstName: String?
    var lastName: String?
    var displayName: String?
    var mobile: String?
    var postcode: String?
    var dob: String?
    var cardNumber: String?
    var cardAssigned: Bool?

    enum CodingKeys: String, CodingKey {
        case id, username, email, mobile, dob
        case firstName = "first_name"
        case lastName = "last_name"
        case displayName = "display_name"
        case postcode = "kod_pocztowy"
        case cardNumber = "numer_karty"
        case cardAssigned = "card_assigned"
    }
}

struct Loyalty: Codable, Equatable {
    var points: FlexibleText?
    var transactionsValue: FlexibleText?
    var discountValue: FlexibleText?
    var cardNumber: FlexibleText?
    var savings: FlexibleText?
    var firstName: FlexibleText?

    enum CodingKeys: String, CodingKey {
        case points, savings
        case transactionsValue = "transactions_value"
        case discountValue = "discount_value"
        case cardNumber = "card_number"
        case firstName = "first_name"
    }
}

struct FlexibleText: Codable, Equatable {
    let value: String

    init(from decoder: Decoder) throws {
        let container = try decoder.singleValueContainer()
        if let string = try? container.decode(String.self) { value = string }
        else if let integer = try? container.decode(Int.self) { value = String(integer) }
        else if let decimal = try? container.decode(Double.self) { value = String(decimal) }
        else { value = "" }
    }
}

struct KasztelanMessage: Codable, Identifiable, Equatable {
    let id: Int
    let title: String
    let text: String
    let sentAt: Int

    enum CodingKeys: String, CodingKey {
        case id, title, text
        case sentAt = "sent_at"
    }
}

struct APIEnvelope: Codable {
    var success: Bool? = nil
    var token: String? = nil
    var user: UserProfile? = nil
    var loyalty: Loyalty? = nil
    var notifications: [KasztelanMessage]? = nil
    var notification: KasztelanMessage? = nil
    var key: String? = nil
    var payload: String? = nil
    var updatedAt: Int? = nil
    var code: String? = nil
    var message: String? = nil

    enum CodingKeys: String, CodingKey {
        case success, token, user, loyalty, notifications, notification, key, payload, code, message
        case updatedAt = "updated_at"
    }
}

struct RegistrationForm {
    var firstName = ""
    var lastName = ""
    var email = ""
    var password = ""
    var mobile = ""
    var postcode = ""
    var dob = ""
    var cardNumber = ""
    var acceptsTerms = false
}

struct ProfileForm {
    var firstName = ""
    var lastName = ""
    var email = ""
    var mobile = ""
    var postcode = ""
    var dob = ""
}