import Foundation
import Combine

final class SettingsStore: ObservableObject {
    @Published var serverURL: String {
        didSet { AppPreferences.store.set(serverURL, forKey: Keys.serverURL) }
    }
    @Published var voiceID: String {
        didSet { AppPreferences.store.set(voiceID, forKey: Keys.voiceID) }
    }
    @Published var textMode: Bool {
        didSet { AppPreferences.store.set(textMode, forKey: Keys.textMode) }
    }

    private enum Keys {
        static let serverURL = "serverURL"
        static let voiceID = "voiceID"
        static let textMode = "textMode"
    }

    static let defaultServerURL = "https://192.168.86.2:9178"

    init() {
        let d = AppPreferences.store
        // Sanitize legacy values: earlier versions wrote the field to storage on
        // every keystroke, so an invalid half-typed URL could be persisted and
        // shipped to the network layer. Fall back to the documented default and
        // repair the stored value once.
        let storedURL = d.string(forKey: Keys.serverURL) ?? Self.defaultServerURL
        switch ServerConfig.parse(storedURL) {
        case .success:
            serverURL = storedURL
        case .failure:
            // Legacy invalid value: repair to the documented default.
            serverURL = Self.defaultServerURL
            d.set(Self.defaultServerURL, forKey: Keys.serverURL)
        }
        let storedVoice = d.string(forKey: Keys.voiceID)
        voiceID = Voices.all.contains { $0.id == storedVoice } ? (storedVoice ?? "") : Voices.defaultID
        textMode = d.bool(forKey: Keys.textMode)
    }

    var trimmedServerURL: String {
        serverURL.trimmingCharacters(in: .whitespacesAndNewlines)
    }
}

enum AppPreferences {
    static let store: UserDefaults = {
        #if DEBUG
        if ProcessInfo.processInfo.arguments.contains("--ui-testing") {
            let suite = "dev.shane.voice.ui-testing"
            let defaults = UserDefaults(suiteName: suite)!
            if ProcessInfo.processInfo.arguments.contains("--reset-ui-testing") {
                defaults.removePersistentDomain(forName: suite)
                // Deterministic offline errors; UI tests must not contact the NAS.
                defaults.set("https://127.0.0.1:1", forKey: "serverURL")
            }
            if ProcessInfo.processInfo.arguments.contains("--live-testing") {
                defaults.set(SettingsStore.defaultServerURL, forKey: "serverURL")
                defaults.set(true, forKey: "textMode")
            }
            return defaults
        }
        #endif
        return .standard
    }()
}