// 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>
/// A single node in the document tree.
///
/// Each node has deterministic `id`, typed `content`, optional `parent`/`children`
/// for tree structure, and metadata like page number, bounding box, and content layer.
/// </summary>
public sealed record DocumentNode
{
    /// <summary>
    /// Deterministic identifier (hash of content + position).
    /// </summary>
    [JsonPropertyName("id")]
    public required string Id { get; init; }

    /// <summary>
    /// Node content — tagged enum, type-specific data only.
    /// </summary>
    [JsonPropertyName("content")]
    public required NodeContent Content { get; init; }

    /// <summary>
    /// Parent node index (`None` = root-level node).
    /// </summary>
    [JsonPropertyName("parent")]
    public uint? Parent { get; init; } = null;

    /// <summary>
    /// Child node indices in reading order.
    /// </summary>
    [JsonPropertyName("children")]
    public List<uint> Children { get; init; } = [];

    /// <summary>
    /// Content layer classification.
    /// </summary>
    [JsonPropertyName("content_layer")]
    public ContentLayer? ContentLayer { get; init; } = null;

    /// <summary>
    /// Page number where this node starts (1-indexed).
    /// </summary>
    [JsonPropertyName("page")]
    public uint? Page { get; init; } = null;

    /// <summary>
    /// Page number where this node ends (for multi-page tables/sections).
    /// </summary>
    [JsonPropertyName("page_end")]
    public uint? PageEnd { get; init; } = null;

    /// <summary>
    /// Bounding box in document coordinates.
    /// </summary>
    [JsonPropertyName("bbox")]
    public BoundingBox? Bbox { get; init; } = null;

    /// <summary>
    /// Inline annotations (formatting, links) on this node's text content.
    ///
    /// Only meaningful for text-carrying nodes; empty for containers.
    /// </summary>
    [JsonPropertyName("annotations")]
    public List<TextAnnotation> Annotations { get; init; } = [];

    /// <summary>
    /// Format-specific key-value attributes.
    ///
    /// Extensible bag for miscellaneous data without a dedicated typed field: CSS classes,
    /// LaTeX environment names, Excel cell formulas, slide layout names, etc.
    /// </summary>
    [JsonPropertyName("attributes")]
    public Dictionary<string, string>? Attributes { get; init; } = null;


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