package utils

import (
	"encoding/json"
	"fmt"

	"go.mongodb.org/mongo-driver/bson"
)

//ToBsonM 将struct转换为 Bson Map
func ToBsonM(s interface{}) (bson.M, error) {
	data, err := bson.Marshal(s)
	if err != nil {
		return nil, err
	}
	m := make(bson.M)
	if err := bson.Unmarshal(data, &m); err != nil {
		return nil, err
	}
	return m, nil
}

// 将page转换为数据库的skip、limit
func ToDBPage(pageNum int64, pageSize int64) (skip int64, limit int64) {
	return (pageNum - 1) * pageSize, pageSize
}

//JSONStruct2Map  将struct转换为Map
func JSONStruct2Map(obj interface{}) (map[string]interface{}, error) {
	m := make(map[string]interface{})
	j, err := json.Marshal(obj)
	if err != nil {
		return nil, err
	}
	if err := json.Unmarshal(j, &m); err != nil {
		return nil, err
	}
	return m, err
}

//Map2JSONStruct  将map转换为Json struct
func Map2JSONStruct(v interface{}, m map[string]interface{}) error {
	j, err := json.Marshal(m)
	if err != nil {
		return err
	}
	if err := json.Unmarshal(j, v); err != nil {
		return err
	}
	return err
}

// struct转换为Map
func Struct2Map(obj interface{}) map[string]interface{} {
	m := make(map[string]interface{})
	b, err := json.Marshal(obj)
	if err != nil {
		return m
	}
	if err = json.Unmarshal(b, &m); err != nil {
		fmt.Println(err)
	}
	return m
}