/**
 * mysql/sequelize
 *
 * 参考文档:
 * https://demopark.github.io/sequelize-docs-Zh-CN/
 * https://sequelize.org/
 * https://sequelize.org/api/v6/identifiers
 * https://www.sequelize.com.cn/
 */
const config = require("./config")
const Sequelize = require("sequelize");
const operatorsAliases = require("./operatorsAliases");
const Api = require("./api");
const Tool = require("./tool.js");
module.exports = async (app) => {
	const {database, username, password, options,} = config
	const sequelize = new Sequelize(database, username, password, {
		...options,
		operatorsAliases:operatorsAliases,
	});
	
	// 加载model文件
	let list = await app.load(config.path)
	list.forEach(item => {
		const {res, parse} = item
		const model = {}
		let primaryKey = false
		for (let key of Object.keys(res.model)) {
			res.model[key].type = Sequelize[res.model[key].type]
			model[key] = res.model[key]
			//如果表设置了主键,那么就不设置默认主键为id了
			if (res.model[key].primaryKey) {
				primaryKey = true
				res.model[key].allowNull = false
				res.model[key].unique = key
				res.model[key].autoIncrement = true
			}
		}
		//如果没有默认主键
		if (!primaryKey) {
			model['id'] = {
				type         : Sequelize.INTEGER,
				comment      : '表自增id',
				allowNull    : false,
				unique       : 'id',
				primaryKey   : true,
				autoIncrement: true,
			}
		}
		
		sequelize.define(parse.name, model)
	})
	app.models = sequelize.models
	const api = new Api(sequelize, sequelize.models)
	app.db = api
	app.db.tool = new Tool(app, sequelize)
	//全局变量
	app.alias["$db"] = app.db
	
	// console.log(api);
	// console.log(await app.db.table("User").find());
	
	//等待所有插件载入完成后,自动更新数据库字段
	//把所有模型的md5值存入到redis里面去,哪个文件的md5有变动就更新哪个表的字段.
	app.willReadyList.push(async () => {
		list.forEach(async item => {
			const {res, parse} = item
			const md5 = await app.redis.get("md5:" + parse.name)
			const newMd5 = getFileMd5(app.root + '/' + parse.dir + "/" + parse.base)
			if (!md5 || newMd5 !== md5) {
				//自动更新表字段
				await app.models[parse.name].sync({alter: true});
				console.log("自动更新表:", parse.name);
				//创建新的md5
				await app.redis.mset("md5:" + parse.name, newMd5)
			}
			
		})
		// await app.db.tool.reduction()
		
	})
	
	
}

//文件md5值
function getFileMd5(url) {
	const buffer = require('fs').readFileSync(url);
	const hash = require('crypto').createHash('md5');
	hash.update(buffer, 'utf8');
	const md5 = hash.digest('hex');
	return md5
}