const config = require("./config")
import mysqldump from 'mysqldump';

const Importer = require('mysql-import');

module.exports = class {
	constructor(app, sequelize) {
		this.app = app
		this.sequelize = sequelize
		this.file = this.app.root + '/' + config.database + '.sql'
	}
	
	//备份数据库所有表
	async backup(file) {
		this.file = file || this.app.root + '/' + config.database + '.sql'
		console.log('备份数据库中...');
		await mysqldump({
			connection: {
				host    : config.options.host,
				port    : config.options.port,
				user    : config.username,
				password: config.password,
				database: config.database,
				
			},
			dumpToFile: this.file,
		});
		console.log('备份数据库完成:', this.file);
	}
	//还原备份sql文件
	async reduction() {
		console.time("reduction")
		//先备份旧数据
		await this.backup(this.app.root + '/' + 'extend/mysql/backup/' + Date.now() + '.sql')
		//清空数据库
		await this.sequelize.drop()
		//导入sql文件
		const importer = new Importer({
			host    : config.options.host,
			port    : config.options.port,
			user    : config.username,
			password: config.password,
			database: config.database,
		});
		this.file = this.app.root + '/' + config.database + '.sql'
		// const res = await importer.import(this.file)
		// console.log(res);
		console.timeEnd("reduction")
	}
	
}