import Foundation

class FavoritesManager: ObservableObject {
  static let shared = FavoritesManager()

  @Published var favorites: [Wallpaper] = []
  private let key = "favoriteWallpapers"

  init() {
    loadFavorites()
  }

  func toggleFavorite(_ wallpaper: Wallpaper) {
    if let index = favorites.firstIndex(where: { $0.id == wallpaper.id }) {
      favorites.remove(at: index)
    } else {
      favorites.insert(wallpaper, at: 0)
    }
    saveFavorites()
  }

  func isFavorite(_ wallpaper: Wallpaper) -> Bool {
    return favorites.contains(where: { $0.id == wallpaper.id })
  }

  private func saveFavorites() {
    if let data = try? JSONEncoder().encode(favorites) {
      UserDefaults.standard.set(data, forKey: key)
    }
  }

  private func loadFavorites() {
    if let data = UserDefaults.standard.data(forKey: key),
      let decoded = try? JSONDecoder().decode([Wallpaper].self, from: data)
    {
      favorites = decoded
    }
  }
}