package service

import (
	"context"
	"fmt"
	"rag/common/eino"
	"rag/model/dto"

	"github.com/cloudwego/eino/components/retriever"
	"github.com/cloudwego/eino/schema"
	"github.com/gogf/gf/v2/os/glog"
	"github.com/gogf/gf/v2/util/gconv"
)

var RAGQuery = new(ragQueryService)

type ragQueryService struct{}

// Query 执行RAG查询
func (s *ragQueryService) Query(ctx context.Context, req *dto.RAGQueryReq) (*dto.RAGQueryRes, error) {
	if req.TopK <= 0 {
		req.TopK = 5
	}

	// 4. 使用向量检索器进行查询
	r, err := eino.NewPGVectorRetriever(&eino.PGVectorRetrieverConfig{
		Embedder:    eino.EmbedderDashscope,
		DefaultTopK: req.TopK,
	})
	if err != nil {
		glog.Errorf(ctx, "初始化向量检索器失败: %v", err)
		return nil, fmt.Errorf("初始化向量检索器失败: %w", err)
	}

	// 5. 执行向量检索
	docs, err := r.Retrieve(ctx, req.Content, retriever.WithEmbedding(eino.EmbedderDashscope), retriever.WithDSLInfo(map[string]any{
		"dataset_ids": req.DatasetIds,
	}))
	if err != nil {
		glog.Errorf(ctx, "向量检索失败: %v", err)
		return nil, fmt.Errorf("向量检索失败: %w", err)
	}

	messages := make([]*schema.Message, 0)
	err = gconv.Struct(req.History, &messages)
	if err != nil {
		glog.Errorf(ctx, "转换历史消息失败: %v", err)
		return nil, fmt.Errorf("转换历史消息失败: %w", err)
	}

	replyMsg, err := eino.NewChatModel(ctx, req.Content, docs, messages)
	if err != nil {
		glog.Errorf(ctx, "向量检索失败: %v", err)
		return nil, fmt.Errorf("向量检索失败: %w", err)
	}

	return &dto.RAGQueryRes{
		Answer: replyMsg.Content,
	}, nil
}