'use strict';
const BAR = Symbol('Application#comoBean');
/**
 * modelbean
 * 用于数据库操作前置、后置
 */
class comoBean {
	/**
	 * [constructor 构造数据对象]
	 * @author 	   szjcomo
	 * @createTime 2020-08-15
	 * @param      {Object}   data [description]
	 * @return     {[type]}        [description]
	 */
	constructor(data = {},options = {}) {
		this.data = data;
		this.options = options;
		this.calls = [];
	}
	/**
	 * [getOptions 获取数据]
	 * @author 	   szjcomo
	 * @createTime 2020-08-15
	 * @return     {[type]}   [description]
	 */
	getOptions() {
		return this.options;
	}
	/**
	 * [getData 返回数据对象]
	 * @author 	   szjcomo
	 * @createTime 2020-08-15
	 * @return     {[type]}   [description]
	 */
	getData() {
		return this.data;
	}
	/**
	 * [setData 设置数据对象]
	 * @author 	   szjcomo
	 * @createTime 2020-08-15
	 * @param      {Object}   data [description]
	 */
	setData(data = {}) {
		this.data = data;
	}
	/**
	 * [setOptions 设置数据]
	 * @author 	   szjcomo
	 * @createTime 2020-08-15
	 * @param      {Object}   options [description]
	 */
	setOptions(options = {}) {
		this.options = options;
	}
	/**
	 * [beforeAction 数据操作前]
	 * @author 	   szjcomo
	 * @createTime 2020-08-15
	 * @return     {[type]}   [description]
	 */
	async before(ctx) {
		let that = this;
		let length = that.calls.length;
		for(let i = 0;i<length;i++) {
			let item = that.calls[i];
			if(item.sence == 'before') {
				await item.callback.call(that,ctx);
			}
		}
	}
	/**
	 * [afterAction 数据操作后]
	 * @author 	   szjcomo
	 * @createTime 2020-08-15
	 * @return     {[type]}   [description]
	 */
	async after(ctx,result) {
		let that = this;
		let length = that.calls.length;
		for(let i = 0;i<length;i++) {
			let item = that.calls[i];
			if(item.sence == 'after') {
				let res = await item.callback.call(that,ctx,result);
				if(res) result = res;
			}
		}
		return result;
	}
	/**
	 * [addCall 注册回调参数]
	 * @author 	   szjcomo
	 * @createTime 2020-08-19
	 * @param      {[type]}   callable [description]
	 * @param      {String}   sence    [description]
	 */
	addCall(callable,sence = 'before') {
		let that = this;
		if(typeof callable !== 'function') return false;
		that.calls.push({callback:callable,sence:sence});
	}
}
/**
 * [exports 导出对象]
 * @type {Object}
 */
module.exports = {
	/**
	 * [modelBean 获取一个modelBean]
	 * @author 	   szjcomo
	 * @createTime 2020-09-05
	 * @return     {[type]}   [description]
	 */
	get comoBean() {
		let app = this;
		if(app[BAR]) return app[BAR];
		app[BAR] = {
			/**
			 * [instance 获取一个实例]
			 * @author 	   szjcomo
			 * @createTime 2020-09-05
			 * @param      {[type]}   data    [description]
			 * @param      {[type]}   options [description]
			 * @return     {[type]}           [description]
			 */
			instance:function(data,options) {
				return new comoBean(data,options);
			},
			/**
			 * [create 创建数据]
			 * @author 	   szjcomo
			 * @createTime 2020-09-05
			 * @param      {[type]}   bean        [description]
			 * @param      {[type]}   model       [description]
			 * @param      {String}   failMessage [description]
			 * @return     {[type]}               [description]
			 */
			create:async function(bean,model,failMessage = '数据创建失败') {
				if(!(bean instanceof comoBean)) throw new Error('Bad bean parameter, bean must be comoBean An example of');
				let before_bean = await bean.before.call(bean,app);
				if(before_bean) bean = before_bean;
				let res = await model.create(bean.getData(),bean.getOptions());
				if(!res) throw new Error(failMessage);
				res = await bean.after.call(bean,app,res);
				return res;
			},
			/**
			 * [update 更新数据]
			 * @author 	   szjcomo
			 * @createTime 2020-09-05
			 * @param      {[type]}   bean        [description]
			 * @param      {[type]}   model       [description]
			 * @param      {String}   failMessage [description]
			 * @return     {[type]}               [description]
			 */
			update:async function(bean,model,failMessage = '数据更新失败') {
				if(!(bean instanceof comoBean)) throw new Error('Bad bean parameter, bean must be app.comoBean An example of');
				let before_bean = await bean.before.call(bean,app);
				if(before_bean) bean = before_bean;
				let res = await model.update(bean.getData(),bean.getOptions());
				if(!res[0]) throw new Error(failMessage);
				res = await bean.after.call(bean,app,res);
				return res;
			},
			/**
			 * [delete 删除数据]
			 * @author 	   szjcomo
			 * @createTime 2020-09-05
			 * @param      {[type]}   bean        [description]
			 * @param      {[type]}   model       [description]
			 * @param      {String}   failMessage [description]
			 * @return     {[type]}               [description]
			 */
			delete:async function(bean,model,failMessage = '数据删除失败') {
				if(!(bean instanceof comoBean)) throw new Error('Bad bean parameter, bean must be app.comoBean An example of');
				let before_bean = await bean.before.call(bean,app);
				if(before_bean) bean = before_bean;
				let res = await model.destroy(bean.getOptions());
				if(!res) throw new Error(failMessage);
				res = await bean.after.call(bean,app,res);
				return res;
			},
			/**
			 * [select 查询数据]
			 * @author 	   szjcomo
			 * @createTime 2020-09-05
			 * @param      {[type]}   bean        [description]
			 * @param      {[type]}   model       [description]
			 * @param      {Boolean}  all         [description]
			 * @param      {Boolean}  count       [description]
			 * @param      {String}   failMessage [description]
			 * @return     {[type]}               [description]
			 */
			select:async function(bean,model,count = false,all = false,failMessage = '数据获取失败') {
				if(!(bean instanceof comoBean)) throw new Error('Bad bean parameter, bean must be app.comoBean An example of');
				let before_bean = await bean.before.call(bean,app);
				if(before_bean) bean = before_bean;
				let res;
				if(count) {
					res = await model.findAndCountAll(bean.getOptions());
				} else if(all) {
					res = await model.findAll(bean.getOptions());
				} else {
					res = await model.findOne(bean.getOptions());
				}
				if(!res) throw new Error(failMessage);
				res = await bean.after.call(bean,app,res);
				return res;
			}
		}
		return app[BAR];
	}
};