import Combine
import Foundation

/// User preferences, persisted in UserDefaults as soon as a value changes.
public final class AppSettings: ObservableObject {
    public static let defaultModelVariant = "large-v3-v20240930_turbo"

    enum Key {
        static let hotkey = "hotkeyID"
        static let model = "modelVariant"
        static let keepHistory = "keepHistory"
        static let usePriming = "usePriming"
        static let useCorrection = "useCorrection"
    }

    private let defaults: UserDefaults

    /// `HotkeyBinding.id` of the key that has to be held.
    @Published public var hotkeyID: String {
        didSet { defaults.set(hotkeyID, forKey: Key.hotkey) }
    }
    @Published public var modelVariant: String {
        didSet { defaults.set(modelVariant, forKey: Key.model) }
    }
    @Published public var keepHistory: Bool {
        didSet { defaults.set(keepHistory, forKey: Key.keepHistory) }
    }
    /// Give the speech engine the dictionary words as context.
    @Published public var usePriming: Bool {
        didSet { defaults.set(usePriming, forKey: Key.usePriming) }
    }
    /// Apply the dictionary corrections after transcription.
    @Published public var useCorrection: Bool {
        didSet { defaults.set(useCorrection, forKey: Key.useCorrection) }
    }

    public init(defaults: UserDefaults = .standard) {
        self.defaults = defaults
        hotkeyID = defaults.string(forKey: Key.hotkey) ?? "fn"
        modelVariant = defaults.string(forKey: Key.model) ?? Self.defaultModelVariant
        keepHistory = defaults.object(forKey: Key.keepHistory) as? Bool ?? true
        usePriming = defaults.object(forKey: Key.usePriming) as? Bool ?? true
        useCorrection = defaults.object(forKey: Key.useCorrection) as? Bool ?? true
    }
}