namespace DocumentService.Client.Models.Requests;

/// <summary>
/// Request DTO for the PDF digital-signing endpoint (JSON payload).
/// </summary>
public sealed record SignPdfRequest
{
    /// <summary>
    /// Base64-encoded PDF to sign.
    /// </summary>
    public required string Base64Pdf { get; init; }

    /// <summary>
    /// Optional Base64-encoded signature image (PNG/JPEG).
    /// </summary>
    public string? Base64SignatureImage { get; init; }

    /// <summary>
    /// Signing options (metadata + appearance).
    /// </summary>
    public required SignPdfOptions Options { get; init; }
}

/// <summary>
/// Signing metadata and appearance options.
/// </summary>
public sealed record SignPdfOptions
{
    /// <summary>
    /// Document element id embedded into the signature metadata.
    /// </summary>
    public long DocumentElementId { get; init; }

    /// <summary>
    /// Signer name.
    /// </summary>
    public required string Name { get; init; }

    /// <summary>
    /// Signing reason.
    /// </summary>
    public string? Reason { get; init; }

    /// <summary>
    /// Signing location.
    /// </summary>
    public string? Location { get; init; }

    /// <summary>
    /// Signer email (optional contact info).
    /// </summary>
    public string? Email { get; init; }

    /// <summary>
    /// Signer phone (optional contact info).
    /// </summary>
    public string? Phone { get; init; }

    /// <summary>
    /// Application name embedded into the signature metadata.
    /// </summary>
    public string? ApplicationName { get; init; }

    /// <summary>
    /// Certification level applied to the signature.
    /// </summary>
    public PdfSignatureCertificationLevel CertificationLevel { get; init; }

    /// <summary>
    /// Optional visual appearance of the signature field.
    /// </summary>
    public PdfSignatureAppearance? Appearance { get; init; }
}

/// <summary>
/// Visual appearance of the signature field.
/// </summary>
public sealed record PdfSignatureAppearance
{
    /// <summary>
    /// Page number (1-based) where the signature is placed.
    /// </summary>
    public int PageNumber { get; init; }

    /// <summary>
    /// Left bound of the signature field.
    /// </summary>
    public double Left { get; init; }

    /// <summary>
    /// Bottom bound of the signature field.
    /// </summary>
    public double Bottom { get; init; }

    /// <summary>
    /// Width of the signature field.
    /// </summary>
    public double Width { get; init; }

    /// <summary>
    /// Height of the signature field.
    /// </summary>
    public double Height { get; init; }

    public bool ShowLabels { get; init; }
    public bool ShowName { get; init; }
    public bool ShowDate { get; init; }
    public bool ShowReason { get; init; }
    public bool ShowLocation { get; init; }
    public bool ShowDistinguishedName { get; init; }

    /// <summary>
    /// Date/time format used in the signature appearance.
    /// </summary>
    public string DateTimeFormat { get; init; } = "dd.MM.yyyy HH:mm:ss zzz";

    /// <summary>
    /// Coordinate unit of the signature bounds.
    /// </summary>
    public PdfSignatureCoordinateUnit CoordinateUnit { get; init; } = PdfSignatureCoordinateUnit.Point;

    /// <summary>
    /// Coordinate origin of the signature bounds.
    /// </summary>
    public PdfSignatureCoordinateOrigin CoordinateOrigin { get; init; } = PdfSignatureCoordinateOrigin.BottomLeft;

    /// <summary>
    /// Font settings of the signature appearance.
    /// </summary>
    public PdfSignatureFont Font { get; init; } = new();
}

/// <summary>
/// Font settings of the signature appearance.
/// </summary>
public sealed record PdfSignatureFont
{
    public string FamilyName { get; init; } = "Helvetica";
    public float Size { get; init; } = 10;
    public bool IsBold { get; init; }
    public bool IsItalic { get; init; }
    public bool IsUnderline { get; init; }
    public PdfSignatureColor Color { get; init; } = new();
}

/// <summary>
/// RGB color (0-255 channels) of the signature appearance font.
/// </summary>
public sealed record PdfSignatureColor
{
    public double R { get; init; }
    public double G { get; init; }
    public double B { get; init; }
}

/// <summary>
/// Certification level of the PDF signature.
/// </summary>
public enum PdfSignatureCertificationLevel
{
    /// <summary>All changes are allowed.</summary>
    NoCertification = 0,

    /// <summary>No changes are allowed.</summary>
    NoChangesAllowed,

    /// <summary>Allows form filling and signing.</summary>
    FillForms,

    /// <summary>Allows form filling, annotation and signing.</summary>
    FillFormsAndAnnotate
}

/// <summary>
/// Coordinate unit of the signature bounds.
/// </summary>
public enum PdfSignatureCoordinateUnit
{
    Point = 0,
    Inch = 1
}

/// <summary>
/// Coordinate origin of the signature bounds.
/// </summary>
public enum PdfSignatureCoordinateOrigin
{
    BottomLeft = 0,
    TopLeft = 1
}