import Foundation
import Combine

/// User-facing settings, persisted to `UserDefaults`.
///
/// Phase 0 scope: backend host + TLS-skip, output folder, and adapter toggles.
/// The adapter toggles persist but do nothing yet (adapters arrive in Phase 3–4).
@MainActor
final class AppSettings: ObservableObject {

    /// Adapters the app will eventually run, in display order.
    static let adapterKeys: [(key: String, label: String)] = [
        ("zoom",   "Zoom"),
        ("teams",  "Microsoft Teams"),
        ("signal", "Signal"),
        ("meet",   "Google Meet"),
    ]

    @Published var backendBaseURL: String {
        didSet { defaults.set(backendBaseURL, forKey: Keys.backendBaseURL) }
    }

    @Published var skipTLSVerification: Bool {
        didSet { defaults.set(skipTLSVerification, forKey: Keys.skipTLS) }
    }

    @Published var outputFolderPath: String {
        didSet { defaults.set(outputFolderPath, forKey: Keys.outputFolder) }
    }

    @Published var adapterEnabled: [String: Bool] {
        didSet { defaults.set(adapterEnabled, forKey: Keys.adapterEnabled) }
    }

    /// Output folder as a resolved file URL (expands a leading `~`).
    var outputFolderURL: URL {
        URL(fileURLWithPath: (outputFolderPath as NSString).expandingTildeInPath,
            isDirectory: true)
    }

    private let defaults: UserDefaults

    init(defaults: UserDefaults = .standard) {
        self.defaults = defaults

        self.backendBaseURL = defaults.string(forKey: Keys.backendBaseURL)
            ?? "https://your-spark-backend.local:62419"

        self.skipTLSVerification = defaults.object(forKey: Keys.skipTLS) as? Bool ?? true

        self.outputFolderPath = defaults.string(forKey: Keys.outputFolder)
            ?? "~/Ten31Transcripts"

        let stored = defaults.dictionary(forKey: Keys.adapterEnabled) as? [String: Bool]
        self.adapterEnabled = stored ?? Dictionary(
            uniqueKeysWithValues: Self.adapterKeys.map { ($0.key, true) }
        )
    }

    private enum Keys {
        static let backendBaseURL = "backendBaseURL"
        static let skipTLS = "skipTLSVerification"
        static let outputFolder = "outputFolderPath"
        static let adapterEnabled = "adapterEnabled"
    }
}