import Foundation
import Observation

@Observable
@MainActor
final class AuthSession {
    var token: String?
    var userName: String?
    var isPremium: Bool = false
    var isLoggingIn: Bool = false
    var errorMessage: String?

    private let tokenKey = "by_token"

    init() {
        if let savedToken = KeychainStore.read(tokenKey) {
            token = savedToken
            APIClient.shared.token = savedToken
        }
    }

    var isLoggedIn: Bool { token != nil }

    func login(email: String, password: String) async {
        isLoggingIn = true
        errorMessage = nil
        defer { isLoggingIn = false }
        do {
            let response: LoginResponse = try await APIClient.shared.post(
                "/api/auth/login",
                body: LoginRequest(email: email, password: password)
            )
            KeychainStore.save(response.token, for: tokenKey)
            APIClient.shared.token = response.token
            self.token = response.token
            self.userName = response.name
            self.isPremium = response.isPremium
        } catch {
            self.errorMessage = error.localizedDescription
        }
    }

    func logout() {
        KeychainStore.delete(tokenKey)
        APIClient.shared.token = nil
        token = nil
        userName = nil
        isPremium = false
    }
}