package logic

import (
	"context"
	"errors"
	"fmt"
	"strings"

	"github.com/google/uuid"
	qdrant "github.com/qdrant/go-client/qdrant"
	openai "github.com/sashabaranov/go-openai"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
	"google.golang.org/grpc/metadata"
	"gorm.io/gorm"

	plantModel "sundynix-micro-go/app/plant/model"
)

func wikiVectorID(wikiID string) string {
	return uuid.NewMD5(uuid.NameSpaceOID, []byte(wikiID)).String()
}

func buildWikiVectorText(w plantModel.Wiki) string {
	return fmt.Sprintf("植物名字:%s. 拉丁名:%s. 别名:%s. 科属:%s. 分布区域:%s. 生命周期:%s. 生长习性:%s. 繁殖方法:%s. 病虫害:%s. 光照强度:%s. 光照类型:%s. 最佳温度:%s. 茎:%s. 叶型:%s. 叶色:%s. 叶形:%s. 高度:%d厘米. 开花期:%s. 花色:%s. 花形:%s. 花直径:%d厘米. 果实:%s.",
		w.Name, w.LatinName, w.Aliases, w.Genus, w.DistributionArea, w.LifeCycle,
		w.GrowthHabit, w.ReproductionMethod, w.PestsDiseases, w.LightIntensity,
		w.LightType, w.OptimalTempPeriod, w.Stem, w.FoliageType, w.FoliageColor,
		w.FoliageShape, w.Height, w.FloweringPeriod, w.FloweringColor,
		w.FloweringShape, w.FlowerDiameter, w.Fruit)
}

func getActiveAiConfig(db *gorm.DB) (*plantModel.SysAiConfig, error) {
	var cfg plantModel.SysAiConfig
	if err := db.Where("is_active = 1").First(&cfg).Error; err != nil {
		return nil, errors.New("数据库未找到已激活的 AI 配置")
	}
	return &cfg, nil
}

func embeddingModel(cfg *plantModel.SysAiConfig) string {
	if cfg.EmbeddingModelName != "" {
		return cfg.EmbeddingModelName
	}
	return "text-embedding-3-small"
}

func createEmbedding(ctx context.Context, cfg *plantModel.SysAiConfig, text string) ([]float32, error) {
	config := openai.DefaultConfig(cfg.EmbeddingApiKey)
	if cfg.EmbeddingApiUrl != "" {
		config.BaseURL = cfg.EmbeddingApiUrl
	}
	client := openai.NewClientWithConfig(config)
	resp, err := client.CreateEmbeddings(ctx, openai.EmbeddingRequest{
		Input: []string{text},
		Model: openai.EmbeddingModel(embeddingModel(cfg)),
	})
	if err != nil {
		return nil, err
	}
	if len(resp.Data) == 0 || len(resp.Data[0].Embedding) == 0 {
		return nil, errors.New("embedding 响应为空")
	}
	return resp.Data[0].Embedding, nil
}

func newQdrantConn(cfg *plantModel.SysAiConfig) (*grpc.ClientConn, context.Context, error) {
	addr := strings.TrimPrefix(cfg.QdrantUrl, "http://")
	addr = strings.TrimPrefix(addr, "https://")
	conn, err := grpc.NewClient(addr, grpc.WithTransportCredentials(insecure.NewCredentials()))
	if err != nil {
		return nil, nil, fmt.Errorf("qdrant grpc dial failed: %w", err)
	}
	ctx := context.Background()
	if cfg.QdrantApiKey != "" {
		ctx = metadata.NewOutgoingContext(ctx, metadata.Pairs("api-key", cfg.QdrantApiKey))
	}
	return conn, ctx, nil
}

func ensureQdrantCollection(cfg *plantModel.SysAiConfig, dim int) error {
	conn, ctx, err := newQdrantConn(cfg)
	if err != nil {
		return err
	}
	defer conn.Close()
	if dim <= 0 {
		dim = cfg.VectorDimension
	}
	if dim <= 0 {
		dim = 1536
	}
	collClient := qdrant.NewCollectionsClient(conn)
	if _, getErr := collClient.Get(ctx, &qdrant.GetCollectionInfoRequest{CollectionName: cfg.QdrantCollection}); getErr == nil {
		return nil
	}
	_, err = collClient.Create(ctx, &qdrant.CreateCollection{
		CollectionName: cfg.QdrantCollection,
		VectorsConfig: &qdrant.VectorsConfig{
			Config: &qdrant.VectorsConfig_Params{
				Params: &qdrant.VectorParams{Size: uint64(dim), Distance: qdrant.Distance_Cosine},
			},
		},
	})
	return err
}

func upsertWikiVector(ctx context.Context, cfg *plantModel.SysAiConfig, w plantModel.Wiki) error {
	text := buildWikiVectorText(w)
	vector, err := createEmbedding(ctx, cfg, text)
	if err != nil {
		return err
	}
	if err := ensureQdrantCollection(cfg, len(vector)); err != nil {
		return err
	}
	conn, qdCtx, err := newQdrantConn(cfg)
	if err != nil {
		return err
	}
	defer conn.Close()
	ptsClient := qdrant.NewPointsClient(conn)

	_, err = ptsClient.Upsert(qdCtx, &qdrant.UpsertPoints{
		CollectionName: cfg.QdrantCollection,
		Points: []*qdrant.PointStruct{{
			Id:      qdrant.NewID(wikiVectorID(w.ID)),
			Vectors: qdrant.NewVectors(vector...),
			Payload: map[string]*qdrant.Value{
				"wiki_id":   qdrant.NewValueString(w.ID),
				"name":      qdrant.NewValueString(w.Name),
				"full_text": qdrant.NewValueString(text),
			},
		}},
	})
	return err
}

func deleteWikiVector(ctx context.Context, cfg *plantModel.SysAiConfig, wikiID string) error {
	conn, qdCtx, err := newQdrantConn(cfg)
	if err != nil {
		return err
	}
	defer conn.Close()
	ptsClient := qdrant.NewPointsClient(conn)

	_, err = ptsClient.Delete(qdCtx, &qdrant.DeletePoints{
		CollectionName: cfg.QdrantCollection,
		Points: &qdrant.PointsSelector{
			PointsSelectorOneOf: &qdrant.PointsSelector_Points{
				Points: &qdrant.PointsIdsList{
					Ids: []*qdrant.PointId{qdrant.NewID(wikiVectorID(wikiID))},
				},
			},
		},
	})
	return err
}