// =============================================================================
// MongoDB 业务操作封装
// 提供向后兼容的CRUD操作方法，支持多数据源
// =============================================================================

package mongo

import (
	"context"
	"errors"
	"fmt"
	"reflect"
	"time"

	"gitee.com/red-future---jilin-g/common/beans"
	"gitee.com/red-future---jilin-g/common/log/model/entity"
	"gitee.com/red-future---jilin-g/common/redis"
	"gitee.com/red-future---jilin-g/common/utils"
	"github.com/gogf/gf/v2/container/gvar"
	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/os/glog"
	"github.com/gogf/gf/v2/os/grpool"
	"github.com/gogf/gf/v2/os/gtime"
	"github.com/gogf/gf/v2/util/gconv"
	"go.mongodb.org/mongo-driver/v2/bson"
	"go.mongodb.org/mongo-driver/v2/mongo"
	"go.mongodb.org/mongo-driver/v2/mongo/options"
)

// =============================================================================
// 向后兼容的MongoDB结构体
// =============================================================================

type MongoDB struct {
	Cache      bool
	dataSource string // 数据源名称，默认为 "default"
}

func DB(cache ...bool) *MongoDB {
	b := true
	if len(cache) > 0 {
		b = cache[0]
	}
	return &MongoDB{
		Cache:      b,
		dataSource: "default",
	}
}

// WithDataSource 指定使用的数据源
func (m *MongoDB) WithDataSource(name string) *MongoDB {
	m.dataSource = name
	return m
}

// =============================================================================
// 向后兼容的全局变量和方法
// =============================================================================

var (
	manager     = GetManager()
	logPool     *grpool.Pool
	serverName  string
	logRedisKey string
)

const PageSize = 20

// GetDB 获取默认数据源的数据库实例（向后兼容）
func GetDB() *mongo.Database {
	source, err := manager.GetDataSource("default")
	if err != nil {
		return nil
	}
	return source.Database()
}

// =============================================================================
// MongoDB 操作方法（支持多数据源）
// =============================================================================

// getDataSource 获取当前使用的数据源
func (m *MongoDB) getDataSource() (DataSource, error) {
	if m.dataSource == "" {
		m.dataSource = "default"
	}
	return manager.GetDataSource(m.dataSource)
}

// Find 查询多条记录
func (m *MongoDB) Find(ctx context.Context, filter bson.M, result interface{}, collection string, page *beans.Page, orderBy []beans.OrderBy) (total int64, err error) {
	source, err := m.getDataSource()
	if err != nil {
		return 0, err
	}
	db := source.Database()

	if err = utils.ValidStructPtr(result); err != nil {
		return
	}
	user, err := utils.GetUserInfo(ctx)
	if err != nil {
		return
	}
	filter["isDeleted"] = false
	filterKey := fmt.Sprintf("%+v", filter)
	optionsKey := fmt.Sprintf("%+v%+v", page, orderBy)
	redisKey := fmt.Sprintf(redis.List, user.TenantId, collection, filterKey, optionsKey)
	if m.Cache {
		var resultStr *gvar.Var
		resultStr, err = redis.RedisClient.Get(ctx, redisKey)
		if err != nil {
			return
		}
		if !resultStr.IsEmpty() {
			if err = resultStr.Structs(result); err != nil {
				return
			}
			total = int64(len(resultStr.Array()))
			return
		}
	}
	filter["tenantId"] = user.TenantId

	limit := int64(PageSize)
	skip := int64(0)
	if page != nil {
		limit = page.PageSize
		if limit == -1 {
			skip = 0
		} else {
			skip = (page.PageNum - 1) * limit
		}
	}
	opt := options.Find().SetSkip(skip)
	if limit != -1 {
		opt.SetLimit(limit)
	} else {
		total, err = m.Count(ctx, filter, collection)
		if err != nil || total == 0 {
			return
		}
	}
	if orderBy == nil {
		opt.SetSort(bson.M{"createdAt": -1})
	} else {
		orderBson := bson.D{}
		for _, v := range orderBy {
			if v.Order == beans.Asc {
				orderBson = append(orderBson, bson.E{Key: v.Field, Value: 1})
			} else {
				orderBson = append(orderBson, bson.E{Key: v.Field, Value: -1})
			}
		}
		opt.SetSort(orderBson)
	}

	cur, err := db.Collection(collection).Find(ctx, filter, opt)
	if err != nil {
		return
	}
	if limit == -1 {
		total = int64(cur.RemainingBatchLength())
	}
	defer cur.Close(ctx)
	if err = cur.All(ctx, result); err != nil {
		return
	}
	if m.Cache {
		err = redis.RedisClient.SetEX(ctx, redisKey, result, int64(time.Hour))
		if err != nil {
			return
		}
	}
	return
}

// FindOne 查询1条记录
func (m *MongoDB) FindOne(ctx context.Context, filter bson.M, result interface{}, collection string, opts ...options.Lister[options.FindOneOptions]) (err error) {
	source, err := m.getDataSource()
	if err != nil {
		return err
	}
	db := source.Database()

	if len(filter) == 0 {
		err = gerror.New("缺少查询条件")
		return
	}
	if err = utils.ValidStructPtr(result); err != nil {
		return
	}
	user, err := utils.GetUserInfo(ctx)
	if err != nil {
		return
	}
	filter["isDeleted"] = false
	filterKey := fmt.Sprintf("%+v", filter)
	redisKey := fmt.Sprintf(redis.One, user.TenantId, collection, filterKey)
	if m.Cache {
		var resultStr *gvar.Var
		resultStr, err = redis.RedisClient.Get(ctx, redisKey)
		if err != nil {
			return
		}
		if !g.IsEmpty(resultStr) {
			err = gconv.Scan(resultStr, result)
			if err != nil {
				return err
			}
			return
		}
	}
	if !g.IsEmpty(user.TenantId) {
		filter["tenantId"] = user.TenantId
	}
	cur := db.Collection(collection).FindOne(ctx, filter, opts...)
	err = cur.Decode(result)
	if errors.Is(err, mongo.ErrNoDocuments) {
		err = nil
	}
	if m.Cache {
		err = redis.RedisClient.SetEX(ctx, redisKey, result, int64(time.Hour))
		if err != nil {
			return err
		}
	}
	return
}

func (m *MongoDB) CleanRedis(ctx context.Context, filter bson.M, tenantId interface{}, collection string) (err error) {
	listKeys := fmt.Sprintf(redis.CleanList, tenantId, collection)
	keys, err := redis.RedisClient.Keys(ctx, listKeys)
	if err != nil {
		return
	}
	for _, key := range keys {
		_, err = redis.RedisClient.Del(ctx, key)
		if err != nil {
			return
		}
	}
	countKeys := fmt.Sprintf(redis.CleanCount, tenantId, collection)
	keys, err = redis.RedisClient.Keys(ctx, countKeys)
	if err != nil {
		return
	}
	for _, key := range keys {
		_, err = redis.RedisClient.Del(ctx, key)
		if err != nil {
			return
		}
	}
	filter["isDeleted"] = false
	delete(filter, "tenantId")
	filterKey := fmt.Sprintf("%+v", filter)
	oneKey := fmt.Sprintf(redis.One, tenantId, collection, filterKey)
	_, err = redis.RedisClient.Del(ctx, oneKey)
	if err != nil {
		return
	}
	return
}

func (m *MongoDB) log(ctx context.Context, filter bson.M, collection string, data interface{}, userName, tenantId interface{}, operationType string) {
	_ = logPool.AddWithRecover(ctx, func(ctx context.Context) {
		log := &entity.OperationLog{
			ServiceName:  serverName,
			Collection:   collection,
			CollectionID: filter["_id"].(string),
			Operation:    operationType,
			IPAddress:    g.RequestFromCtx(ctx).GetClientIp(),
			Data:         data,
		}
		log.Creator = userName
		now := &gtime.Now().Time
		log.CreatedAt = now
		log.UpdatedAt = now
		log.TenantId = tenantId
		if _, err := redis.AddToStream(ctx, logRedisKey, log); err != nil {
			glog.Error(ctx, "mongoLog-AddToStream err: %v", err)
		}
	}, func(ctx context.Context, exception error) {
		glog.Error(ctx, "mongoLog-AddWithRecover err: %v", exception)
	})
	return
}

// Delete 删除记录
func (m *MongoDB) Delete(ctx context.Context, filter bson.M, collection string, opts ...options.Lister[options.DeleteManyOptions]) (count int64, err error) {
	source, err := m.getDataSource()
	if err != nil {
		return 0, err
	}
	db := source.Database()

	if len(filter) == 0 {
		err = gerror.New("缺少查询条件")
		return
	}
	user, err := utils.GetUserInfo(ctx)
	if err != nil {
		return
	}
	filter["tenantId"] = user.TenantId
	r, err := db.Collection(collection).DeleteMany(ctx, filter, opts...)
	if err != nil {
		return
	}
	count = r.DeletedCount
	err = m.CleanRedis(ctx, filter, user.TenantId, collection)
	return
}

// Update 修改记录
func (m *MongoDB) Update(ctx context.Context, filter bson.M, update bson.M, collection string, opts ...options.Lister[options.UpdateManyOptions]) (result *mongo.UpdateResult, err error) {
	source, err := m.getDataSource()
	if err != nil {
		return nil, err
	}
	db := source.Database()

	if len(filter) == 0 {
		err = gerror.New("缺少查询条件")
		return
	}
	filter["isDeleted"] = false
	user, err := utils.GetUserInfo(ctx)
	if err != nil {
		return
	}
	if !g.IsEmpty(user.TenantId) {
		filter["tenantId"] = user.TenantId
	}
	setDoc := update["$set"].(bson.M)
	if !g.IsEmpty(user.UserName) {
		setDoc["updater"] = user.UserName
	}
	setDoc["updatedAt"] = gtime.Now().Time
	update = bson.M{"$set": setDoc}
	result, err = db.Collection(collection).UpdateMany(ctx, filter, update, opts...)
	if err != nil {
		return
	}
	err = m.CleanRedis(ctx, filter, user.TenantId, collection)
	return
}

// RandomSoftDelete 随机软删除个文档的 _id
func (m *MongoDB) RandomSoftDelete(ctx context.Context, limit int, collection string, opts ...options.Lister[options.UpdateManyOptions]) (result *mongo.UpdateResult, err error) {
	source, err := m.getDataSource()
	if err != nil {
		return nil, err
	}
	db := source.Database()

	_ = opts
	pipeline := mongo.Pipeline{
		bson.D{{Key: "$addFields", Value: bson.D{{Key: "random", Value: bson.M{"$rand": bson.M{}}}}}},
		bson.D{{Key: "$match", Value: bson.D{{Key: "isDeleted", Value: false}}}},
		bson.D{{Key: "$sort", Value: bson.D{{Key: "random", Value: -1}}}},
		bson.D{{Key: "$limit", Value: limit}},
		bson.D{{Key: "$project", Value: bson.D{{Key: "_id", Value: 1}}}},
	}
	cursor, err := db.Collection(collection).Aggregate(ctx, pipeline)
	if err != nil {
		return
	}
	defer cursor.Close(ctx)

	var idsToUpdate []bson.ObjectID
	for cursor.Next(ctx) {
		var result bson.M
		if err := cursor.Decode(&result); err != nil {
			return nil, err
		}
		id := result["_id"].(bson.ObjectID)
		idsToUpdate = append(idsToUpdate, id)
	}
	if err := cursor.Err(); err != nil {
		return nil, err
	}
	fmt.Printf("准备更新的随机文档ID: %v\n", idsToUpdate)

	if len(idsToUpdate) > 0 {
		filter := bson.D{{Key: "_id", Value: bson.D{{Key: "$in", Value: idsToUpdate}}}}
		update := bson.D{{Key: "$set", Value: bson.D{{Key: "isDeleted", Value: true}}}}
		_, err = db.Collection(collection).UpdateMany(ctx, filter, update)
		if err != nil {
			return
		}
	}
	return
}

// SaveOrUpdate 批量增加或修改
func (m *MongoDB) SaveOrUpdate(ctx context.Context, filter []bson.M, update []bson.M, collection string, opts ...options.Lister[options.UpdateManyOptions]) (result *mongo.BulkWriteResult, err error) {
	source, err := m.getDataSource()
	if err != nil {
		return nil, err
	}
	db := source.Database()

	if len(filter) == 0 || len(update) == 0 {
		err = gerror.New("缺少查询条件或更新数据")
		return
	}
	if len(filter) != len(update) {
		err = gerror.New("查询条件和更新数据的数量必须一致")
		return
	}
	user, err := utils.GetUserInfo(ctx)
	if err != nil {
		return
	}

	var models []mongo.WriteModel
	for i := 0; i < len(filter); i++ {
		filter[i]["isDeleted"] = false
		if !g.IsEmpty(user.TenantId) {
			filter[i]["tenantId"] = user.TenantId
		}
		if setDoc, exists := update[i]["$set"].(bson.M); exists {
			if !g.IsEmpty(user.UserName) {
				setDoc["updater"] = user.UserName
			}
			setDoc["updatedAt"] = gtime.Now().Time
		} else {
			setDoc := bson.M{}
			if !g.IsEmpty(user.UserName) {
				setDoc["updater"] = user.UserName
			}
			setDoc["updatedAt"] = gtime.Now().Time
			update[i]["$set"] = setDoc
		}
		updateModel := mongo.NewUpdateOneModel()
		updateModel.SetFilter(filter[i])
		updateModel.SetUpdate(update[i])
		updateModel.SetUpsert(true)
		if len(opts) > 0 {
			for _, opt := range opts {
				var updateOpts options.UpdateManyOptions
				optFuncs := opt.List()
				for _, fn := range optFuncs {
					fn(&updateOpts)
				}
				if updateOpts.Upsert != nil {
					updateModel.SetUpsert(*updateOpts.Upsert)
				}
			}
		}
		models = append(models, updateModel)
	}

	bulkOpts := options.BulkWrite().SetOrdered(false)
	bulkResult, err := db.Collection(collection).BulkWrite(ctx, models, bulkOpts)
	if err != nil {
		return nil, err
	}

	for _, filterItem := range filter {
		err = m.CleanRedis(ctx, filterItem, user.TenantId, collection)
		if err != nil {
			glog.Warning(ctx, "清理Redis缓存失败:", err)
		}
	}
	return bulkResult, nil
}

// Insert 插入多条记录
func (m *MongoDB) Insert(ctx context.Context, documents []interface{}, collection string, opts ...options.Lister[options.InsertManyOptions]) (ids []interface{}, err error) {
	source, err := m.getDataSource()
	if err != nil {
		return nil, err
	}
	db := source.Database()

	user, err := utils.GetUserInfo(ctx)
	if err != nil {
		return
	}
	docs := make([]interface{}, 0, len(documents))
	for _, document := range documents {
		doc := gconv.Map(document)
		delete(doc, "id")
		if !g.IsEmpty(user.UserName) {
			doc["creator"] = user.UserName
		}
		if !g.IsEmpty(user.UserName) {
			doc["updater"] = user.UserName
		}
		if !g.IsEmpty(user.TenantId) {
			doc["tenantId"] = user.TenantId
		}
		doc["createdAt"] = gtime.Now().Time
		doc["updatedAt"] = gtime.Now().Time
		doc["isDeleted"] = false
		docs = append(docs, doc)
	}
	r, err := db.Collection(collection).InsertMany(ctx, docs, opts...)
	if err != nil {
		return
	}
	ids = r.InsertedIDs
	err = m.CleanRedis(ctx, bson.M{}, user.TenantId, collection)
	return
}

// Count 查询总数
func (m *MongoDB) Count(ctx context.Context, filter bson.M, collection string) (count int64, err error) {
	source, err := m.getDataSource()
	if err != nil {
		return 0, err
	}
	db := source.Database()

	user, err := utils.GetUserInfo(ctx)
	if err != nil {
		return
	}
	filter["isDeleted"] = false
	delete(filter, "tenantId")
	filterKey := fmt.Sprintf("%+v", filter)
	redisKey := fmt.Sprintf(redis.Count, user.TenantId, collection, filterKey)
	if m.Cache {
		var resultStr *gvar.Var
		resultStr, err = redis.RedisClient.Get(ctx, redisKey)
		if err != nil {
			return
		}
		if !g.IsEmpty(resultStr) {
			count = gconv.Int64(resultStr)
			return
		}
	}
	count, err = db.Collection(collection).CountDocuments(ctx, filter)
	if m.Cache {
		err = redis.RedisClient.SetEX(ctx, redisKey, count, int64(time.Hour))
		if err != nil {
			return
		}
	}
	return
}

// EntityToBson 将 *entity/entity 转换为 bson.M
func EntityToBson(entity interface{}) (bson.M, error) {
	return EntityToBsonWithFilter(entity, false)
}

// EntityToBsonWithFilter 将 *entity/entity 转换为 bson.M，并可选择是否过滤空值
func EntityToBsonWithFilter(entity interface{}, filterEmpty bool) (bson.M, error) {
	if entity == nil {
		return nil, fmt.Errorf("传入的 entity 实例为 nil")
	}
	bsonBytes, err := bson.Marshal(entity)
	if err != nil {
		return nil, fmt.Errorf("entity 序列化为 BSON 字节流失败：%w", err)
	}
	var bsonMap bson.M
	err = bson.Unmarshal(bsonBytes, &bsonMap)
	if err != nil {
		return nil, fmt.Errorf("BSON 字节流反序列化为 bson.M 失败：%w", err)
	}
	if filterEmpty {
		for key, value := range bsonMap {
			if isEmptyWithZero(value) {
				delete(bsonMap, key)
			}
		}
	}
	return bsonMap, nil
}

// isEmptyWithZero 判断是否为空值，但保留 int 类型的 0 值
func isEmptyWithZero(value interface{}) bool {
	if value == nil {
		return true
	}
	rv := reflect.ValueOf(value)
	kind := rv.Kind()
	if kind == reflect.Ptr {
		if rv.IsNil() {
			return true
		}
		kind = rv.Elem().Kind()
	}
	switch kind {
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
		reflect.Float32, reflect.Float64:
		return false
	default:
		return g.IsEmpty(value)
	}
}