BotSharp/src/Plugins/BotSharp.Plugin.Qdrant/QdrantDb.cs

using BotSharp.Abstraction.Utilities;
using BotSharp.Abstraction.VectorStorage.Models;
using Qdrant.Client;
using Qdrant.Client.Grpc;

namespace BotSharp.Plugin.Qdrant;

public class QdrantDb : IVectorDb
{
    private QdrantClient _client;
    private readonly QdrantSetting _setting;
    private readonly IServiceProvider _services;

    public QdrantDb(
        QdrantSetting setting,
        IServiceProvider services)
    {
        _setting = setting;
        _services = services;
    }

    public string Name => "Qdrant";

    private QdrantClient GetClient()
    {
        if (_client == null)
        {
            _client = new QdrantClient
            (
                host: _setting.Url,
                https: true,
                apiKey: _setting.ApiKey
            );
        }
        return _client;
    }

    public async Task<IEnumerable<string>> GetCollections()
    {
        // List all the collections
        var collections = await GetClient().ListCollectionsAsync();
        return collections.ToList();
    }

    public async Task<StringIdPagedItems<VectorCollectionData>> GetCollectionData(string collectionName, VectorFilter filter)
    {
        var client = GetClient();
        var exist = await DoesCollectionExist(client, collectionName);
        if (!exist)
        {
            return new StringIdPagedItems<VectorCollectionData>();
        }

        var totalPointCount = await client.CountAsync(collectionName);
        var response = await client.ScrollAsync(collectionName, limit: (uint)filter.Size, 
            offset: !string.IsNullOrWhiteSpace(filter.StartId) ? new PointId { Uuid = filter.StartId } : 0,
            vectorsSelector: filter.WithVector);
        var points = response?.Result?.Select(x => new VectorCollectionData
        {
            Id = x.Id?.Uuid ?? string.Empty,
            Data = x.Payload.ToDictionary(x => x.Key, x => x.Value.StringValue),
            Vector = filter.WithVector ? x.Vectors?.Vector?.Data?.ToArray() : null
        })?.ToList() ?? new List<VectorCollectionData>();

        return new StringIdPagedItems<VectorCollectionData>
        {
            Count = totalPointCount,
            NextId = response?.NextPageOffset?.Uuid,
            Items = points
        };
    }

    public async Task CreateCollection(string collectionName, int dim)
    {
        var client = GetClient();
        var exist = await DoesCollectionExist(client, collectionName);
        if (!exist)
        {
            // Create a new collection
            await client.CreateCollectionAsync(collectionName, new VectorParams()
            {
                Size = (ulong)dim,
                Distance = Distance.Cosine
            });
        }

        // Get collection info
        var collectionInfo = await client.GetCollectionInfoAsync(collectionName);
        if (collectionInfo == null)
        {
            throw new Exception($"Create {collectionName} failed.");
        }
    }

    public async Task<bool> Upsert(string collectionName, Guid id, float[] vector, string text, Dictionary<string, string>? payload = null)
    {
        // Insert vectors
        var point = new PointStruct()
        {
            Id = new PointId()
            {
                Uuid = id.ToString()
            },
            Vectors = vector,
            Payload =
            {
                { KnowledgePayloadName.Text, text }
            }
        };

        if (payload != null)
        {
            foreach (var item in payload)
            {
                point.Payload.Add(item.Key, item.Value);
            }
        }

        var client = GetClient();
        var result = await client.UpsertAsync(collectionName, points: new List<PointStruct>
        {
            point
        });

        return result.Status == UpdateStatus.Completed;
    }

    public async Task<IEnumerable<VectorCollectionData>> Search(string collectionName, float[] vector,
        IEnumerable<string>? fields, int limit = 5, float confidence = 0.5f, bool withVector = false)
    {
        var results = new List<VectorCollectionData>();

        var client = GetClient();
        var exist = await DoesCollectionExist(client, collectionName);
        if (!exist)
        {
            return results;
        }

        var points = await client.SearchAsync(collectionName,
            vector,
            limit: (ulong)limit,
            scoreThreshold: confidence,
            vectorsSelector: new WithVectorsSelector { Enable = withVector });

        var pickFields = fields != null;
        foreach (var point in points)
        {
            var data = new Dictionary<string, string>();
            if (pickFields)
            {
                foreach (var field in fields)
                {
                    if (point.Payload.ContainsKey(field))
                    {
                        data[field] = point.Payload[field].StringValue;
                    }
                    else
                    {
                        data[field] = "";
                    }
                }
            }
            else
            {
                data = point.Payload.ToDictionary(k => k.Key, v => v.Value.StringValue);
            }

            results.Add(new VectorCollectionData
            {
                Id = point.Id.Uuid,
                Data = data,
                Score = point.Score,
                Vector = withVector ? point.Vectors?.Vector?.Data?.ToArray() : null
            });
        }

        return results;
    }

    public async Task<bool> DeleteCollectionData(string collectionName, Guid id)
    {
        var client = GetClient();
        var result = await client.DeleteAsync(collectionName, id);
        return result.Status == UpdateStatus.Completed;
    }


    private async Task<bool> DoesCollectionExist(QdrantClient client, string collectionName)
    {
        return await client.CollectionExistsAsync(collectionName);
    }
}