using BotSharp.Abstraction.Agents;
using BotSharp.Abstraction.VectorStorage;
using Microsoft.Extensions.DependencyInjection;
using Qdrant.Client;
using Qdrant.Client.Grpc;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

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;

    }

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

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

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

            var agentService = _services.GetRequiredService<IAgentService>();
            var agentDataDir = agentService.GetAgentDataDir(collectionName);
            var knowledgePath = Path.Combine(agentDataDir, "knowledge.txt");
            File.WriteAllLines(knowledgePath, new string[0]);
        }

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

    public async Task Upsert(string collectionName, int id, float[] vector, string text)
    {
        // Insert vectors
        await GetClient().UpsertAsync(collectionName, points: new List<PointStruct>
        {
            new PointStruct() 
            {
                Id = new PointId()
                {
                    Num = (ulong)id,
                },
                Vectors = vector
            }
        });

        // Store chunks in local file system
        var agentService = _services.GetRequiredService<IAgentService>();
        var agentDataDir = agentService.GetAgentDataDir(collectionName);
        var knowledgePath = Path.Combine(agentDataDir, "knowledge.txt");
        File.AppendAllLines(knowledgePath, new[] { text });
    }

    public async Task<List<string>> Search(string collectionName, float[] vector, int limit = 5)
    {
        var result = await GetClient().SearchAsync(collectionName, vector, limit: (ulong)limit);

        var agentService = _services.GetRequiredService<IAgentService>();
        var agentDataDir = agentService.GetAgentDataDir(collectionName);
        var knowledgePath = Path.Combine(agentDataDir, "knowledge.txt");
        var texts = File.ReadAllLines(knowledgePath);

        return result.Select(x => texts[x.Id.Num]).ToList();
    }
}