package dao

import (
	"context"
	"time"

	"gitee.com/red-future---jilin-g/common/log/consts"
	"gitee.com/red-future---jilin-g/common/log/model/dto"
	"gitee.com/red-future---jilin-g/common/log/model/entity"
	"gitee.com/red-future---jilin-g/common/mongo"
	"go.mongodb.org/mongo-driver/v2/bson"
	"go.mongodb.org/mongo-driver/v2/mongo/options"
)

type log struct{}

// Log 日志数据访问对象
var Log = &log{}

// Create 创建日志记录
func (d *log) Create(ctx context.Context, log *entity.OperationLog) error {
	_, err := mongo.DB().Insert(ctx, []interface{}{log}, consts.OperationLogCollection)
	return err
}

// CreateBatch 批量创建日志记录
func (d *log) CreateBatch(ctx context.Context, logs []*entity.OperationLog) error {
	if len(logs) == 0 {
		return nil
	}

	documents := make([]interface{}, len(logs))
	for i, log := range logs {
		documents[i] = log
	}

	_, err := mongo.DB().Insert(ctx, documents, consts.OperationLogCollection)
	return err
}

// GetByID 根据ID获取日志
func (d *log) GetByID(ctx context.Context, id string) (*entity.OperationLog, error) {
	objectID, err := bson.ObjectIDFromHex(id)
	if err != nil {
		return nil, err
	}

	filter := bson.M{"_id": objectID}
	var log entity.OperationLog
	err = mongo.DB().FindOne(ctx, filter, &log, consts.OperationLogCollection)
	if err != nil {
		return nil, err
	}
	return &log, nil
}

// List 查询日志列表（通用方法，通过filter动态拼接查询条件）
func (d *log) List(ctx context.Context, filter *dto.ListLogsReq, sortFields ...string) ([]*entity.OperationLog, int64, error) {
	bsonFilter := buildFilter(filter)

	total, err := mongo.DB().Count(ctx, bsonFilter, consts.OperationLogCollection)
	if err != nil {
		return nil, 0, err
	}

	var findOptions []options.Lister[options.FindOptions]
	if filter.PageNum > 0 && filter.PageSize > 0 {
		findOptions = append(findOptions, options.Find().SetSkip(int64((filter.PageNum-1)*filter.PageSize)).SetLimit(int64(filter.PageSize)))
	}

	if len(sortFields) > 0 {
		sort := bson.D{}
		for _, field := range sortFields {
			var order int
			if len(field) > 0 && field[0] == '-' {
				order = -1
				field = field[1:]
			} else {
				order = 1
			}
			sort = append(sort, bson.E{Key: field, Value: order})
		}
		findOptions = append(findOptions, options.Find().SetSort(sort))
	} else {
		findOptions = append(findOptions, options.Find().SetSort(bson.D{{Key: "createdAt", Value: -1}}))
	}

	var logs []*entity.OperationLog
	_, err = mongo.DB().Find(ctx, bsonFilter, &logs, consts.OperationLogCollection, nil, nil)
	if err != nil {
		return nil, 0, err
	}

	return logs, total, nil
}

// buildFilter 构建MongoDB查询过滤器
func buildFilter(filter interface{}) bson.M {
	bsonFilter := make(bson.M)

	// 从ListLogsReq结构体中提取字段值
	if req, ok := filter.(*dto.ListLogsReq); ok {
		if req.ServiceName != "" {
			bsonFilter["service_name"] = req.ServiceName
		}
		if req.Collection != "" {
			bsonFilter["collection"] = req.Collection
		}
		if req.CollectionID != "" {
			bsonFilter["collection_id"] = req.CollectionID
		}
		if req.Operation != "" {
			bsonFilter["operation"] = req.Operation
		}

		// 处理时间范围字段
		if req.StartTime != "" || req.EndTime != "" {
			timeFilter := bson.M{}
			if req.StartTime != "" {
				if startTime, err := time.Parse("2006-01-02 15:04:05", req.StartTime); err == nil {
					timeFilter["$gte"] = startTime
				}
			}
			if req.EndTime != "" {
				if endTime, err := time.Parse("2006-01-02 15:04:05", req.EndTime); err == nil {
					timeFilter["$lte"] = endTime
				}
			}
			if len(timeFilter) > 0 {
				bsonFilter["createdAt"] = timeFilter
			}
		}
	}

	return bsonFilter
}