import {MysqlDB,MysqlUtil}  from '../extra/mysqldb';
// const RedisBridge   = require(Core.Path.ExtraLib + '/redisdb.js');
import MongoDB    from 'mongodb';
import MemcacheDB from 'memcached';
import * as RedisDB    from 'redis';

(global as any).MysqlUtil = MysqlUtil;

//默认配置
const DatabaseOption:any = {
    mysql    : '{"host":"localhost","port":3306,"user":"root","password":"","database":"","prefix":"","connectionLimit":10}',
    mongodb  : '{"host":"localhost","port":27017,"user":null,"password":"","database":"","prefix":""}',
    memcache : '{"host":"localhost","port":11211}',
    redis    : '{"host":"localhost","port":6379,"prefix":null}'
}

class Database {
    /**
     * @param  {String} DatabaseType    数据库类型
     * @param  {Object} option          数据库配置
     * @param  {String} GlobalName      自动全局命名
     * @param  {Function} callback      回调函数
     */
    public static async create(DatabaseType:string,option:DBOption,GlobalName?:string){
        DatabaseType = DatabaseType.toLowerCase();
        switch(DatabaseType){
            case 'mysql':
                return await Creater._createMysqlConnection(option,GlobalName);
            case 'mongodb':
                return await Creater._createMongoConnection(option,GlobalName);
            case 'memcache':
                return await Creater._createMemcacheConnection(option,GlobalName);
            case 'redis':
                return await Creater._createRedisConnection(option,GlobalName);
            default:
                return {err:new Error('Wrong database type!')};
        }
    }

    //生成默认配置
    public static getOption(type:string){
        type = type.toLowerCase();
        if(DatabaseOption[type]!=undefined){
            return JSON.parse(DatabaseOption[type]);
        }else{
            return null;
        }
    }
}

//连接控制器
class Creater{
    static _createMysqlConnection (option:DBOption,GlobalName?:string){
        return new Promise((resolve,reject)=>{
            const _MysqlDB = new MysqlDB(option);
            // if(!callback || typeof(callback)!='function') callback = ()=>{return}
            //连接测试
            _MysqlDB.query('SELECT VERSION() as version',(err,result,fields?:any)=>{
                if(err){
                    LOGGER.error('Mysql Connect error,please recheck your config');
                    if(err.stack) LOGGER.error(err.stack);
                    return resolve({err})
                }else{
                    LOGGER.info('Mysql Connect success');
                    LOGGER.info(`Mysql Version: ${result[0]['version']} | User: ${option.user} | Database: ${option.database} | GlobalName: ${GlobalName}`);
                    if(GlobalName){
                        if((global as any)[GlobalName]){
                            LOGGER.error(`Create global name fail with "${GlobalName}"`);
                            return resolve({err:new Error('Duplicate global name')})
                        }else{
                            (global as any)[GlobalName] = _MysqlDB;
                        }
                    }
                    resolve({err:null,client:_MysqlDB})
                }
            });
        })
        
    }
    static _createMongoConnection(option:DBOption,GlobalName?:string){
        return new Promise((resolve,rejects)=>{
            const verify = option.user?option.user+':'+option.password+'@':'';
            const mongoConnect = 'mongodb://' + verify + option.host+':'+option.port+'/'+option.database;
            // if(!callback) callback = ()=>{return}
            MongoDB.MongoClient.connect(mongoConnect,(err?:Error,db?:any)=>{
                if(err) {
                    LOGGER.error('MongoDB connect error!');
                    if(err.stack) LOGGER.error(err.stack);
                    return resolve({err})
                }else{
                    LOGGER.info(`Mongodb Connect success | GlobalName: ${GlobalName}`);
                    const _mongoClient = {
                        db:db,
                        c:(collection:any)=>{
                            return db.collection(option.prefix+collection);
                        }
                    };
                    if(GlobalName){
                        if((global as any)[GlobalName]){
                            LOGGER.error(`Create global name fail with "${GlobalName}"`);
                            return resolve({err:new Error('Duplicate global name')})
                        }
                        (global as any)[GlobalName] = _mongoClient;
                    }

                    resolve({err:null,client:_mongoClient})
                }
            });
        })
        
    }
    static _createMemcacheConnection(option:DBOption,GlobalName?:string){
        return new Promise(async (resolve,reject)=>{
            const _Memcache  = new MemcacheDB(option.host+':'+option.port);
            _Memcache.version(function(err,data){
                if(err){
                    LOGGER.error('Memcache Connect error,please recheck your config');
                    LOGGER.error(err);
                    resolve({err});
                }else{
                    LOGGER.info('Memcache Connect success');
                    LOGGER.info(`Memcache Version: ${data[0]['version']} | GlobalName: ${GlobalName}`);
                    if(GlobalName){
                        if((global as any)[GlobalName]){
                            LOGGER.error(`Create global name fail with "${GlobalName}"`);
                            resolve({err:new Error('Duplicate global name')});
                            return;
                        }else{
                            (global as any)[GlobalName] = _Memcache;
                        }
                    }
                    resolve({err:null,client:_Memcache});
                }
            });
        });
    }
    static async _createRedisConnection(option:DBOption,GlobalName?:string){
        return new Promise(async (resolve,reject)=>{
            let _redisConnStr = `${option.host}:${option.port}`;
            _redisConnStr = `redis://${option.user||''}:${option.password||''}@${_redisConnStr}`;
            const _redisClient = RedisDB.createClient({url:_redisConnStr,socket:{keepAlive:30000}});
            _redisClient.on('error',(err:Error)=>{
                if(err instanceof RedisDB.SocketClosedUnexpectedlyError){
                    LOGGER.error(`Redis [${option.host}:${option.port}] connect has been refused,please recheck your config,and make sure redis server is running!`);
                    resolve({err:err});
                }
            })
            _redisClient.on('ready',async ()=>{
                LOGGER.info(`Redis Connect [${option.user||''}@${option.host}:${option.port}] success [${GlobalName||'UNKNOW'}]`);
                const infoStr = <string>await _redisClient.info();
                const infoLine = infoStr.split('\n');
                const info:any = {};
                for(const line of infoLine){
                    const lineArr = line.split(':');
                    if(lineArr.length>1) info[lineArr[0]] = lineArr[1];
                }
                if(info.redis_version) LOGGER.info(`GlobalName: ${GlobalName||'UNKNOW'} | Server Version: ${info.redis_version}`);
                // _redisClient.stream.setKeepAlive(true,30 * 1000);
    
                if(GlobalName){
                    if((global as any)[GlobalName]){
                        LOGGER.error(`Create global name fail with "${GlobalName}"`);
                        return resolve({err:new Error('Duplicate global name')});
                    }else{
                        (global as any)[GlobalName] = _redisClient;
                    }
                }
                resolve({err:null,client:_redisClient});
            });
            _redisClient.on('reconnecting',function(e:any){
                LOGGER.warn('Redis lost connect,reconnecting!');
            });
            await _redisClient.connect();
        })
        
            
        //     {port:option.port,host:option.host,socket_keepalive:true,socket_initialdelay:30000,retry_strategy: function (retryData) {
        //     if (retryData.error && retryData.error.code === 'ECONNREFUSED') {
                
        //     }
        //     if (retryData.total_retry_time > 1000 * 10) {
        //         LOGGER.error('Redis retry connect time exhausted');
        //     }
        //     if (retryData.attempt > 10) {
        //         LOGGER.error('Redis unknow error');
        //     }
        //     // reconnect after
        //     return Math.min(retryData.attempt * 100, 3000);
        // },prefix:option.prefix});
        // if(!callback || typeof(callback)!='function') callback = ()=>{}
        
    }
}

// (global as any).DBManager = Database;

module.exports = Database;