// This file is auto-generated by alef — DO NOT EDIT.
// alef:hash:4e15143f4af1ae8bafbdb1506ef057da924484c66a19483966333558ad437e75
// To regenerate: alef generate
// To verify freshness: alef verify --exit-code
// Issues & docs: https://github.com/kreuzberg-dev/alef
#nullable enable

using System;
using System.Collections.Generic;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace Kreuzberg;

/// <summary>
/// PDF-specific metadata.
///
/// Contains metadata fields specific to PDF documents that are not in the common
/// `Metadata` structure. Common fields like title, authors, keywords, and dates
/// are at the `Metadata` level.
/// </summary>
public sealed record PdfMetadata
{
    /// <summary>
    /// PDF version (e.g., "1.7", "2.0")
    /// </summary>
    [JsonPropertyName("pdf_version")]
    public string? PdfVersion { get; init; } = null;

    /// <summary>
    /// PDF producer (application that created the PDF)
    /// </summary>
    [JsonPropertyName("producer")]
    public string? Producer { get; init; } = null;

    /// <summary>
    /// Whether the PDF is encrypted/password-protected
    /// </summary>
    [JsonPropertyName("is_encrypted")]
    public bool? IsEncrypted { get; init; } = null;

    /// <summary>
    /// First page width in points (1/72 inch)
    /// </summary>
    [JsonPropertyName("width")]
    public long? Width { get; init; } = null;

    /// <summary>
    /// First page height in points (1/72 inch)
    /// </summary>
    [JsonPropertyName("height")]
    public long? Height { get; init; } = null;

    /// <summary>
    /// Total number of pages in the PDF document
    /// </summary>
    [JsonPropertyName("page_count")]
    public uint? PageCount { get; init; } = null;


    /// <summary>
    /// Parse a <see cref="PdfMetadata"/> from a JSON string.
    /// </summary>
    /// <exception cref="KreuzbergException">When the JSON cannot be deserialised.</exception>
    public static PdfMetadata FromJson(string json)
    {
        try
        {
            return JsonSerializer.Deserialize<PdfMetadata>(json, JsonOptions)
                ?? throw new KreuzbergException($"Failed to parse PdfMetadata from JSON: deserializer returned null");
        }
        catch (KreuzbergException)
        {
            throw;
        }
        catch (Exception e)
        {
            throw new KreuzbergException($"Failed to parse PdfMetadata from JSON: {e.Message}", e);
        }
    }

    private static readonly JsonSerializerOptions JsonOptions = new()
    {
        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingDefault,
        Converters = { new JsonStringEnumConverter(JsonNamingPolicy.SnakeCaseLower) },
    };

    /// <summary>Options for serializing config/input objects to FFI. Strips nulls
    /// (nullable C# fields default to null and would override required Rust fields with
    /// non-deserialisable nulls) but preserves explicit false/0 so caller intent is kept.</summary>
    private static readonly JsonSerializerOptions JsonSerializationOptions = new()
    {
        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
        Converters = { new JsonStringEnumConverter(JsonNamingPolicy.SnakeCaseLower) },
    };
}
