package repository

import (
	"context"
	"errors"

	"code.30cm.net/digimon/app-cloudep-product-service/pkg/domain"
	"code.30cm.net/digimon/app-cloudep-product-service/pkg/domain/entity"
	"code.30cm.net/digimon/app-cloudep-product-service/pkg/domain/repository"
	mgo "code.30cm.net/digimon/library-go/mongo"

	"time"

	"github.com/zeromicro/go-zero/core/stores/cache"

	"github.com/zeromicro/go-zero/core/stores/mon"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/bson/primitive"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
)

type CategoryRepositoryParam struct {
	Conf      *mgo.Conf
	CacheConf cache.CacheConf
	DBOpts    []mon.Option
	CacheOpts []cache.Option
}

type CategoryRepository struct {
	DB mgo.DocumentDBWithCacheUseCase
}

func MustCategoryRepository(param CategoryRepositoryParam) repository.CategoryRepository {
	e := entity.Category{}

	documentDB, err := mgo.MustDocumentDBWithCache(
		param.Conf,
		e.CollectionName(),
		param.CacheConf,
		param.DBOpts,
		param.CacheOpts,
	)
	if err != nil {
		panic(err)
	}

	return &CategoryRepository{
		DB: documentDB,
	}
}

func (repo *CategoryRepository) IsCategoryExists(ctx context.Context, ids []string) []string {
	// 將傳入的 string id 轉換為 ObjectID
	objectIDs := make([]primitive.ObjectID, 0, len(ids))
	for _, id := range ids {
		objID, err := primitive.ObjectIDFromHex(id)
		if err == nil { // 如果轉換失敗，忽略該 id
			objectIDs = append(objectIDs, objID)
		}
	}

	// 查詢存在的標籤
	filter := bson.M{"_id": bson.M{"$in": objectIDs}}
	// find 並沒有快取要快取要去其他地方做
	opts := options.Find().SetProjection(bson.M{"_id": 1}) // 只返回 _id 欄位
	// 執行查詢並獲取結果
	var category []*entity.Category
	err := repo.DB.GetClient().Find(ctx, &category, filter, opts)
	if err != nil {
		return []string{}
	}

	// 將存在的標籤ID轉換回 string，並加入結果列表
	existingIDs := make([]string, 0, len(category))
	for _, item := range category {
		existingIDs = append(existingIDs, item.ID.Hex())
	}

	return existingIDs
}

func (repo *CategoryRepository) Insert(ctx context.Context, data *entity.Category) error {
	now := time.Now().UTC().UnixNano()
	if data.ID.IsZero() {
		data.ID = primitive.NewObjectID()
		data.CreatedAt = now
		data.UpdatedAt = now
	}

	_, err := repo.DB.GetClient().InsertOne(ctx, data)

	return err
}

func (repo *CategoryRepository) FindOneByID(ctx context.Context, id string) (*entity.Category, error) {
	oid, err := primitive.ObjectIDFromHex(id)
	if err != nil {
		return nil, ErrInvalidObjectID
	}

	var data entity.Category
	rk := domain.GetCategoryRedisKey(id)
	err = repo.DB.FindOne(ctx, rk, &data, bson.M{"_id": oid})
	switch {
	case err == nil:
		return &data, nil
	case errors.Is(err, mon.ErrNotFound):
		return nil, ErrNotFound
	default:
		return nil, err
	}
}

func (repo *CategoryRepository) Update(ctx context.Context, id string, data *entity.Category) (*mongo.UpdateResult, error) {
	oid, err := primitive.ObjectIDFromHex(id)
	if err != nil {
		return nil, ErrInvalidObjectID
	}

	updateFields := bson.M{}
	if data.Name != "" {
		updateFields["name"] = data.Name
	}

	updateFields["updated_at"] = time.Now().UTC().UnixNano()

	// 構建查找條件
	filter := bson.M{"_id": oid}
	update := bson.M{"$set": updateFields}
	opt := options.Update().SetUpsert(false)

	rk := domain.GetCategoryRedisKey(id)
	res, err := repo.DB.UpdateOne(ctx, rk, filter, update, opt)
	if err != nil {
		return nil, err
	}

	// 檢查更新結果，若沒有匹配的文檔，則返回錯誤
	if res.MatchedCount == 0 {
		return nil, ErrNotFound // 自定義的錯誤表示未找到記錄
	}

	return res, err
}

func (repo *CategoryRepository) Delete(ctx context.Context, id string) (int64, error) {
	oid, err := primitive.ObjectIDFromHex(id)
	if err != nil {
		return 0, ErrInvalidObjectID
	}
	rk := domain.GetCategoryRedisKey(id)
	res, err := repo.DB.DeleteOne(ctx, rk, bson.M{"_id": oid})

	return res, err
}

func (repo *CategoryRepository) ListCategory(ctx context.Context, params *repository.CategoryQueryParams) ([]*entity.Category, int64, error) {
	// TODO 有需要列表快取實在取列表快取
	// 構建查詢過濾器
	filter := bson.M{}
	if len(params.ID) > 0 {
		objectIDs := make([]primitive.ObjectID, 0, len(params.ID))
		for _, id := range params.ID {
			objID, err := primitive.ObjectIDFromHex(id)
			if err != nil {
				continue
			}
			objectIDs = append(objectIDs, objID)
		}
		filter["_id"] = bson.M{"$in": objectIDs}
	}

	// 設置排序選項
	opts := options.Find().SetSkip((params.PageIndex - 1) * params.PageSize).SetLimit(params.PageSize)
	opts.SetSort(bson.D{{Key: "created_at", Value: -1}})

	// 查詢符合條件的總數
	count, err := repo.DB.GetClient().CountDocuments(ctx, filter)
	if err != nil {
		return nil, 0, err
	}

	// 執行查詢並獲取結果
	var category []*entity.Category
	err = repo.DB.GetClient().Find(ctx, &category, filter, opts)
	if err != nil {
		return nil, 0, err
	}

	return category, count, nil
}