// 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>
/// Preset configurations for common RAG use cases.
///
/// Each preset combines chunk size, overlap, and embedding model
/// to provide an optimized configuration for specific scenarios.
///
/// All string fields are owned `String` for FFI compatibility — instances
/// are safe to clone and pass across language boundaries.
/// </summary>
public sealed record EmbeddingPreset
{
    [JsonPropertyName("name")]
    public required string Name { get; init; }

    [JsonPropertyName("chunk_size")]
    public ulong ChunkSize { get; init; } = 0;

    [JsonPropertyName("overlap")]
    public ulong Overlap { get; init; } = 0;

    /// <summary>
    /// HuggingFace repository name for the model.
    /// </summary>
    [JsonPropertyName("model_repo")]
    public required string ModelRepo { get; init; }

    /// <summary>
    /// Pooling strategy: "cls" or "mean".
    /// </summary>
    [JsonPropertyName("pooling")]
    public required string Pooling { get; init; }

    /// <summary>
    /// Path to the ONNX model file within the repo.
    /// </summary>
    [JsonPropertyName("model_file")]
    public required string ModelFile { get; init; }

    [JsonPropertyName("dimensions")]
    public ulong Dimensions { get; init; } = 0;

    [JsonPropertyName("description")]
    public required string Description { get; init; }


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