package db

import (
	"encoding/hex"
	"fmt"
	"mtp2_if/config"
	"mtp2_if/packet"

	"gopkg.in/mgo.v2"
)

var session *mgo.Session
var mongodb *mgo.Database

// InitMongoDB 初始化连接MongoDB
func InitMongoDB() error {
	// 创建链接
	var err error
	session, err = mgo.Dial(fmt.Sprintf("%s:%d", config.SerCfg.GetMongoDBHostname(), config.SerCfg.GetMongoDBPort()))
	if err != nil {
		return err
	}

	// 选择DB
	mongodb = session.DB(config.SerCfg.GetMongoDBDBName())

	// 尝试解密
	var dbUser []byte
	ciphertext, _ := hex.DecodeString(config.SerCfg.GetMongoDBUsername())
	if len(ciphertext) > 8 {
		ciphertext = ciphertext[4 : len(ciphertext)-8]
		dbUser, _ = packet.Decrypt(ciphertext, packet.AESKey, true)
		if dbUser == nil {
			dbUser = []byte(config.SerCfg.GetMongoDBUsername())
		}
	} else {
		dbUser = []byte(config.SerCfg.GetMongoDBUsername())
	}
	var dbPwd []byte
	ciphertext, _ = hex.DecodeString(config.SerCfg.GetMongoDBPassword())
	if len(ciphertext) > 8 {
		ciphertext = ciphertext[4 : len(ciphertext)-8]
		dbPwd, _ = packet.Decrypt(ciphertext, packet.AESKey, true)
		if dbPwd == nil {
			dbPwd = []byte(config.SerCfg.GetMongoDBPassword())
		}
	} else {
		dbPwd = []byte(config.SerCfg.GetMongoDBPassword())
	}

	// 登陆
	if err := mongodb.Login(string(dbUser), string(dbPwd)); err != nil {
		return err
	}

	return nil
}

// GetMongoDB 获取MongoDB Database
func GetMongoDB() *mgo.Database {
	return mongodb
}

// CloseMongoDB 关闭MongoDB连接
func CloseMongoDB() {
	session.Close()
}