package mongo

import (
	"context"
	"errors"
	"fmt"
	"strings"
	"sync"
	"time"

	"gitee.com/red-future---jilin-g/common/log/model/dto"
	"github.com/gogf/gf/v2/container/gvar"

	"gitee.com/red-future---jilin-g/common/redis"
	"gitee.com/red-future---jilin-g/common/utils"
	"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/gtime"
	"github.com/gogf/gf/v2/text/gstr"
	"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"
)

type MongoDB struct {
	Cache bool
}

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

var (
	db           *mongo.Database
	client       *mongo.Client
	isConnected  bool
	mu           sync.RWMutex
	mongoAddr    string
	dbName       string
	healthCtx    context.Context
	healthCancel context.CancelFunc
)

// checkConnected 检查连接状态
func checkConnected() bool {
	mu.RLock()
	defer mu.RUnlock()
	return isConnected
}

// connect 建立MongoDB连接
func connect() error {
	mu.Lock()
	defer mu.Unlock()

	if client != nil {
		client.Disconnect(context.Background())
	}

	// 创建连接选项
	opt := options.Client().
		ApplyURI(mongoAddr).
		SetMaxPoolSize(100).
		SetMinPoolSize(10).
		SetMaxConnecting(10).
		SetConnectTimeout(10 * time.Second)

	var err error
	client, err = mongo.Connect(opt)
	if err != nil {
		isConnected = false
		glog.Error(context.Background(), "MongoDB连接失败", err)
		return err
	}

	// 测试连接
	testCtx, testCancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer testCancel()

	err = client.Ping(testCtx, nil)
	if err != nil {
		isConnected = false
		glog.Error(testCtx, "MongoDB连接测试失败", err)
		return err
	}

	db = client.Database(dbName)
	isConnected = true
	glog.Info(context.Background(), "✅ MongoDB连接成功")
	return nil
}

// GetDB 获取 MongoDB 数据库实例
func GetDB() *mongo.Database {
	mu.RLock()
	defer mu.RUnlock()
	return db
}

// healthCheck 健康检查协程
func healthCheck() {
	ticker := time.NewTicker(30 * time.Second)
	defer ticker.Stop()

	for {
		select {
		case <-healthCtx.Done():
			return
		case <-ticker.C:
			mu.RLock()
			currentConnected := isConnected
			currentClient := client
			mu.RUnlock()

			if !currentConnected || currentClient == nil {
				glog.Warning(context.Background(), "MongoDB连接断开，尝试重连")
				if err := reconnect(); err != nil {
					glog.Error(context.Background(), "MongoDB重连失败", err)
				}
				continue
			}

			// 测试连接状态
			testCtx, testCancel := context.WithTimeout(context.Background(), 5*time.Second)
			err := currentClient.Ping(testCtx, nil)
			testCancel()

			if err != nil {
				mu.Lock()
				isConnected = false
				mu.Unlock()
				glog.Warning(context.Background(), "MongoDB连接健康检查失败", err)

				// 尝试重连
				if err := reconnect(); err != nil {
					glog.Error(context.Background(), "MongoDB重连失败", err)
				}
			} else {
				glog.Debug(context.Background(), "MongoDB连接健康检查通过")
			}
		}
	}
}

// reconnect 重连函数
func reconnect() error {
	maxRetries := 3
	retryDelay := 2 * time.Second

	for i := 0; i < maxRetries; i++ {
		glog.Info(context.Background(), fmt.Sprintf("尝试第%d次重连MongoDB", i+1))

		if err := connect(); err == nil {
			glog.Info(context.Background(), "MongoDB重连成功")
			return nil
		}

		if i < maxRetries-1 {
			time.Sleep(retryDelay)
			retryDelay *= 2 // 指数退避
		}
	}

	return gerror.New("MongoDB重连失败，已达到最大重试次数")
}

// init 初始化MongoDB连接
func init() {
	// 按需初始化：没有配置 mongo.address 则跳过
	mongoAddr = g.Cfg().MustGet(context.Background(), "mongo.address").String()
	if mongoAddr == "" {
		return
	}

	// 创建健康检查上下文
	healthCtx, healthCancel = context.WithCancel(context.Background())

	// 从连接串中解析数据库名
	dbName = gstr.SubStr(mongoAddr, strings.LastIndex(mongoAddr, "/")+1, len(mongoAddr))
	// 如果连接串带有参数（如 ?retryWrites=true），需要去掉参数部分
	if strings.Contains(dbName, "?") {
		dbName = gstr.SubStr(dbName, 0, strings.Index(dbName, "?"))
	}
	go func() {
		// 初始连接
		if err := connect(); err != nil {
			glog.Error(context.Background(), "MongoDB初始连接失败", err)
			return
		}
	}()

	// 启动健康检查协程
	go healthCheck()
}

// close 关闭MongoDB连接
func close() {
	if healthCancel != nil {
		healthCancel()
	}

	mu.Lock()
	defer mu.Unlock()

	if client != nil {
		disconnectCtx, disconnectCancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer disconnectCancel()
		client.Disconnect(disconnectCtx)
	}

	isConnected = false
	glog.Info(context.Background(), "MongoDB连接已关闭")
}
func listOptionsToMap(ctx context.Context, opts ...options.Lister[options.FindOptions]) (m map[string]interface{}) {
	// 输出opts参数中的值
	m = make(map[string]interface{})
	for _, opt := range opts {
		var findOpts options.FindOptions
		optFuncs := opt.List()
		for _, fn := range optFuncs {
			fn(&findOpts)
		}
		if findOpts.Limit != nil {
			m["limit"] = *findOpts.Limit
		}
		if findOpts.Skip != nil {
			m["skip"] = *findOpts.Skip
		}
		if findOpts.Sort != nil {
			m["sort"] = findOpts.Sort
		}
		if findOpts.Projection != nil {
			m["projection"] = findOpts.Projection
		}
	}
	m = utils.OrderMap(m)
	return
}
func oneOptionsToMap(ctx context.Context, opts ...options.Lister[options.FindOneOptions]) (m map[string]interface{}) {
	// 输出opts参数中的值
	m = make(map[string]interface{})
	for _, opt := range opts {
		var findOpts options.FindOneOptions
		optFuncs := opt.List()
		for _, fn := range optFuncs {
			fn(&findOpts)
		}
		if findOpts.Skip != nil {
			m["skip"] = *findOpts.Skip
		}
		if findOpts.Sort != nil {
			m["sort"] = findOpts.Sort
		}
		if findOpts.Projection != nil {
			m["projection"] = findOpts.Projection
		}
	}
	m = utils.OrderMap(m)
	return
}

// Find 查询多条记录
func (m *MongoDB) Find(ctx context.Context, filter bson.M, result interface{}, collection string, opts ...options.Lister[options.FindOptions]) (err error) {
	if err = utils.ValidStructPtr(result); err != nil {
		return
	}
	user, err := utils.GetUserInfo(ctx)
	if err != nil {
		return
	}
	filter["isDeleted"] = false
	filterMap := utils.OrderMap(filter)
	optsMap := listOptionsToMap(ctx, opts...)
	redisKey := fmt.Sprintf(redis.List, user.TenantId, collection, gconv.String(filterMap), gconv.String(optsMap))
	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
		}
	}
	filter["tenantId"] = user.TenantId
	cur, err := db.Collection(collection).Find(ctx, filter, opts...)
	if err != nil {
		return
	}
	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 err
		}
	}
	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) {
	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
	filterMap := utils.OrderMap(filter)
	redisKey := fmt.Sprintf(redis.One, user.TenantId, collection, gconv.String(filterMap))
	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")
	filterMap := utils.OrderMap(filter)
	oneKey := fmt.Sprintf(redis.One, tenantId, collection, gconv.String(filterMap))
	_, err = redis.RedisClient.Del(ctx, oneKey)
	if err != nil {
		return
	}
	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) {
	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
	var rows []interface{}
	if err = m.Find(ctx, filter, &rows, collection); err != nil {
		return
	}
	r, err := db.Collection(collection).DeleteMany(ctx, filter, opts...)
	if err != nil {
		return
	}
	count = r.DeletedCount
	err = m.CleanRedis(ctx, filter, user.TenantId, collection)
	serverName := g.Cfg().MustGet(ctx, "server.name").String()
	logRedisKey := fmt.Sprintf("log:%s", serverName)
	if _, err = redis.AddToStream(ctx, logRedisKey, &dto.RecordCreateLogReq{
		ServiceName: serverName,
		Collection:  collection,
		Data:        rows,
	}); err != nil {
		glog.Error(ctx, "mongoLog-AddToStream err: %v", err)
	}
	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) {
	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}
	var rows []interface{}
	if err = m.Find(ctx, filter, &rows, collection); err != nil {
		return
	}
	result, err = db.Collection(collection).UpdateMany(ctx, filter, update, opts...)
	if err != nil {
		return
	}
	err = m.CleanRedis(ctx, filter, user.TenantId, collection)
	serverName := g.Cfg().MustGet(ctx, "server.name").String()
	logRedisKey := fmt.Sprintf("log:%s", serverName)
	if _, err = redis.AddToStream(ctx, logRedisKey, &dto.RecordCreateLogReq{
		ServiceName: serverName,
		Collection:  collection,
		Data:        rows,
	}); err != nil {
		glog.Error(ctx, "mongoLog-AddToStream err: %v", err)
	}
	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) {
	// 步骤 1: 使用聚合管道的 $sample 操作符随机抽取5个文档的 _id
	pipeline := mongo.Pipeline{
		// 阶段1: 为每个文档添加一个 0-1 之间的随机数字段 'random'
		bson.D{{Key: "$addFields", Value: bson.D{{Key: "random", Value: bson.M{"$rand": bson.M{}}}}}},
		// 阶段1: 匹配所有未删除的文档
		bson.D{{Key: "$match", Value: bson.D{{Key: "isDeleted", Value: false}}}},
		// 阶段2: 按随机数降序排序
		bson.D{{Key: "$sort", Value: bson.D{{Key: "random", Value: -1}}}},
		// 阶段3: 只取前5个
		bson.D{{Key: "$limit", Value: limit}},
		// 阶段4: 只投影 _id
		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)
	// 步骤 2: 从聚合结果中提取 _id 到一个切片中
	var idsToUpdate []bson.ObjectID
	for cursor.Next(ctx) {
		var result bson.M
		if err := cursor.Decode(&result); err != nil {
			return nil, err
		}
		// 将 bson.M 中的 _id 断言为 primitive.ObjectID
		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)
	// 步骤 3: 使用 $in 操作符和 UpdateMany 批量更新选定的文档
	if len(idsToUpdate) > 0 {
		// 过滤条件：匹配 idsToUpdate 切片中的任意一个 _id
		filter := bson.D{{Key: "_id", Value: bson.D{{Key: "$in", Value: idsToUpdate}}}}
		// 更新操作：使用 $set 修改字段
		update := bson.D{{Key: "$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) {
	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
	}
	// 构建批量操作模型
	var models []mongo.WriteModel
	for i := 0; i < len(filter); i++ {
		// 处理过滤器
		filter[i]["isDeleted"] = false
		if !g.IsEmpty(user.TenantId) {
			filter[i]["tenantId"] = user.TenantId
		}
		// 处理更新数据
		if setDoc, exists := update[i]["$set"].(bson.M); exists {
			if !g.IsEmpty(user.UserName) {
				setDoc["updater"] = user.UserName
			}
			setDoc["updatedAt"] = gtime.Now().Time
		} else {
			// 如果没有$set字段，则创建一个
			setDoc := bson.M{}
			if !g.IsEmpty(user.UserName) {
				setDoc["updater"] = user.UserName
			}
			setDoc["updatedAt"] = gtime.Now().Time
			update[i]["$set"] = setDoc
		}
		// 创建更新操作模型
		updateModel := mongo.NewUpdateOneModel()
		updateModel.SetFilter(filter[i])
		updateModel.SetUpdate(update[i])
		updateModel.SetUpsert(true) // 默认不插入新文档
		// 处理选项参数
		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)
	}
	// 执行批量操作，无序执行提高性能
	bulkOpts := options.BulkWrite().SetOrdered(false)
	bulkResult, err := db.Collection(collection).BulkWrite(ctx, models, bulkOpts)
	if err != nil {
		return nil, err
	}
	// 清理相关缓存
	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) {
	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)
	//写日志
	serverName := g.Cfg().MustGet(ctx, "server.name").String()
	logRedisKey := fmt.Sprintf("log:%s", serverName)
	if len(ids) == 0 {
		return
	}
	rows := make([]interface{}, 0, len(ids))
	if len(ids) == 1 {
		doc := gconv.Map(documents[0])
		doc["id"] = ids[0]
		rows = append(rows, doc)
	} else {
		filter := bson.M{"_id": bson.M{"$in": ids}}
		if err = m.Find(ctx, filter, &rows, collection); err != nil {
			return
		}
	}
	if _, err = redis.AddToStream(ctx, logRedisKey, &dto.RecordCreateLogReq{
		ServiceName: serverName,
		Collection:  collection,
		Data:        rows,
	}); err != nil {
		glog.Error(ctx, "mongoLog-AddToStream err: %v", err)
	}
	return
}

// Count  查询总数
func (m *MongoDB) Count(ctx context.Context, filter bson.M, collection string) (count int64, err error) {
	user, err := utils.GetUserInfo(ctx)
	if err != nil {
		return
	}
	filter["isDeleted"] = false
	filterMap := utils.OrderMap(filter)
	redisKey := fmt.Sprintf(redis.Count, user.TenantId, collection, gconv.String(filterMap))
	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
		}
	}
	// 调用驱动的 CountDocuments，在数据库端执行的
	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
}

// EntityToBSONM 将 *entity/entity 转换为 bson.M
// 支持传入值类型或指针类型，返回 bson.M 和错误信息
func EntityToBSONM(entity interface{}) (bson.M, error) {
	// 第一步：判断入参是否为 nil 或无效类型
	if entity == nil {
		return nil, fmt.Errorf("传入的 entity 实例为 nil")
	}
	// 第二步：将 entity 序列化为 BSON 字节流
	// bson.Marshal 支持值类型和指针类型，会自动解析结构体的 bson 标签
	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)
	}
	// 第三步：将 BSON 字节流反序列化为 bson.M
	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)
	}
	return bsonMap, nil
}