using FieldLogger.Models;

namespace FieldLogger.Services;

/// <summary>Persisted app settings: paired device identities, active job, map key.</summary>
public sealed class SettingsService
{
    private const string LocatorIdKey = "device.locator.id";
    private const string LocatorNameKey = "device.locator.name";
    private const string RtkIdKey = "device.rtk.id";
    private const string RtkNameKey = "device.rtk.name";
    private const string ActiveJobKey = "job.active.id";
    private const string MapsApiKeyKey = "maps.apikey";
    private const string MqttEnabledKey = "mqtt.enabled";
    private const string MqttHostKey = "mqtt.host";
    private const string MqttPortKey = "mqtt.port";
    private const string MqttOrgIdKey = "mqtt.org.id";
    private const string MqttClientIdKey = "mqtt.client.id";
    private const string MqttPasswordKey = "mqtt.password";

    public Guid? GetSavedDeviceId(DeviceKind kind)
    {
        var raw = Preferences.Default.Get(IdKey(kind), string.Empty);
        return Guid.TryParse(raw, out var id) ? id : null;
    }

    public string? GetSavedDeviceName(DeviceKind kind)
    {
        var name = Preferences.Default.Get(NameKey(kind), string.Empty);
        return string.IsNullOrEmpty(name) ? null : name;
    }

    public void SaveDevice(DeviceKind kind, Guid id, string name)
    {
        Preferences.Default.Set(IdKey(kind), id.ToString());
        Preferences.Default.Set(NameKey(kind), name);
    }

    public void ClearDevice(DeviceKind kind)
    {
        Preferences.Default.Remove(IdKey(kind));
        Preferences.Default.Remove(NameKey(kind));
    }

    public int? ActiveJobId
    {
        get
        {
            var id = Preferences.Default.Get(ActiveJobKey, 0);
            return id > 0 ? id : null;
        }
        set => Preferences.Default.Set(ActiveJobKey, value ?? 0);
    }

    /// <summary>Google Maps JavaScript API key used by the Windows WebView map.</summary>
    public string GoogleMapsApiKey
    {
        get => Preferences.Default.Get(MapsApiKeyKey, string.Empty);
        set => Preferences.Default.Set(MapsApiKeyKey, value);
    }

    public bool MqttEnabled
    {
        get => Preferences.Default.Get(MqttEnabledKey, false);
        set => Preferences.Default.Set(MqttEnabledKey, value);
    }

    public string MqttHost
    {
        get => Preferences.Default.Get(MqttHostKey, "dev.hub.umagul.net");
        set => Preferences.Default.Set(MqttHostKey, value.Trim());
    }

    public int MqttPort
    {
        get => Preferences.Default.Get(MqttPortKey, 8884);
        set => Preferences.Default.Set(MqttPortKey, value);
    }

    /// <summary>The interim MQTT username is the organization id.</summary>
    public string MqttOrgId
    {
        get => Preferences.Default.Get(MqttOrgIdKey, string.Empty);
        set => Preferences.Default.Set(MqttOrgIdKey, value.Trim());
    }

    public string MqttClientId
    {
        get
        {
            var existing = Preferences.Default.Get(MqttClientIdKey, string.Empty);
            if (!string.IsNullOrWhiteSpace(existing)) return existing;
            var created = $"fieldlogger-{Guid.NewGuid():N}";
            Preferences.Default.Set(MqttClientIdKey, created);
            return created;
        }
    }

    public Task<string?> GetMqttPasswordAsync() => SecureStorage.Default.GetAsync(MqttPasswordKey);

    public Task SetMqttPasswordAsync(string password) =>
        string.IsNullOrWhiteSpace(password)
            ? throw new ArgumentException("MQTT password cannot be empty.", nameof(password))
            : SecureStorage.Default.SetAsync(MqttPasswordKey, password);

    public void ClearMqttPassword() => SecureStorage.Default.Remove(MqttPasswordKey);

    private static string IdKey(DeviceKind kind) => kind == DeviceKind.Locator ? LocatorIdKey : RtkIdKey;
    private static string NameKey(DeviceKind kind) => kind == DeviceKind.Locator ? LocatorNameKey : RtkNameKey;
}