namespace GoogleApi.Configuration;

/// <summary>
/// Root configuration for Google Ads API integration.
/// Bind to the "GoogleAds" section in appsettings.json or environment variables.
/// </summary>
public sealed class GoogleAdsConfig
{
    public const string SectionName = "GoogleAds";

    /// <summary>
    /// Enable/disable real API calls. When false, the provider returns emulated responses.
    /// </summary>
    public bool EnableRealApi { get; set; } = false;

    /// <summary>
    /// Target Google Ads API version used by generated stubs (e.g. "v22").
    /// NOTE: This value is informational; the compiled code targets a specific Vxx namespace.
    /// </summary>
    public string ApiVersion { get; set; } = "v22";

    /// <summary>
    /// Developer token from your Google Ads manager account.
    /// </summary>
    public string DeveloperToken { get; set; } = string.Empty;

    /// <summary>
    /// OAuth 2.0 application credentials used for server-to-server calls.
    ///
    /// IMPORTANT:
    /// - There is no interactive OAuth flow at runtime.
    /// - A refresh token is generated once (out-of-band) and stored securely.
    /// - This service uses that refresh token to obtain access tokens automatically.
    /// </summary>
    public GoogleOAuthConfig OAuth { get; set; } = new();

    /// <summary>
    /// Default login customer ID (manager account / MCC) if not specified per request.
    /// Format: 1234567890 (no dashes)
    /// </summary>
    public string? DefaultLoginCustomerId { get; set; }

    /// <summary>
    /// Request timeout in seconds.
    /// </summary>
    public int TimeoutSeconds { get; set; } = 60;
}

/// <summary>
/// OAuth configuration for Google Ads API.
/// This provider uses the "refresh token" (offline) flow for non-interactive server-to-server calls.
/// </summary>
public sealed class GoogleOAuthConfig
{
    public string ClientId { get; set; } = string.Empty;
    public string ClientSecret { get; set; } = string.Empty;

    /// <summary>
    /// Platform refresh token used to obtain access tokens without user interaction.
    /// Store in Key Vault / secret store; inject via environment variables in prod.
    /// </summary>
    public string? RefreshToken { get; set; }
}

/// <summary>
/// Per-request Google Ads context, populated from request and/or database.
/// </summary>
public sealed class GoogleAdsContext
{
    /// <summary>
    /// Target Google Ads customer ID for this request.
    /// Format: 1234567890 (no dashes)
    /// </summary>
    public required string CustomerId { get; set; }

    /// <summary>
    /// Login customer ID (manager account / MCC).
    /// Required when accessing client accounts under a manager account.
    /// </summary>
    public string? LoginCustomerId { get; set; }

    /// <summary>
    /// Optional override refresh token for a specific account (if you ever store per-account tokens).
    /// If null, the platform token from config is used.
    /// </summary>
    public string? RefreshToken { get; set; }
}