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var createError = require('http-errors');
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var express = require('express');
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var path = require('path');
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var cookieParser = require('cookie-parser');
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var logger = require('morgan');
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var bodyParser = require('body-parser');
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const fs = require("fs");
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var formRouter = require('./routes/form');
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var processRouter = require('./routes/camunda');
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var proxy = require('express-http-proxy');
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let config = require('./config');
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var app = express();
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app.all('*', function(req, res, next) {
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//设置允许跨域的域名，*代表允许任意域名跨域
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res.header("Access-Control-Allow-Origin", "*");
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// res.header("Access-Control-Allow-Origin", "http://www.zilber.cn");
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//允许的header类型
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res.header('Access-Control-Allow-Headers', 'Content-type, Authorization');
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//跨域允许的请求方式
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res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS,PATCH");
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//可选，用来指定本次预检请求的有效期，单位为秒。在此期间，不用发出另一条预检请求。
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res.header('Access-Control-Max-Age',1728000);//预请求缓存20天
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if (req.method === 'OPTIONS') {
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res.sendStatus(200); // 对于 OPTIONS 预检请求，返回200状态码并结束响应
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return;
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}
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next();
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});
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app.use(bodyParser.json({limit: '50000mb'}));
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app.use(bodyParser.urlencoded({limit: '50000mb', extended: true}));
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// view engine setup
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app.set('views', path.join(__dirname, 'views'));
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app.set('view engine', 'jade');
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app.use(logger('dev'));
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app.use(express.json());
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app.use(express.urlencoded({ extended: false }));
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app.use(cookieParser());
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app.use('/resource',express.static(path.join(__dirname, './resource')));
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app.use('/front',express.static(path.join(__dirname, './dist')));
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// app.use('/resource',express.static(path.join(__dirname, 'resource')));
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app.use('/process/form', formRouter);
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app.use('/process', processRouter);
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app.use('/ry', proxy(config.server.ryRedirect));
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app.get('/',function(req,res){
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var url = req.url;
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//res.send("Hello word");
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// const filePath = path.join(__dirname,'./front-dist/index.html')
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const filePath = path.join(__dirname, '.', 'dist', 'index.html');
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console.log(filePath);
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fs.readFile( filePath , function(err,data){
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/*
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一参为文件路径
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二参为回调函数
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回调函数的一参为读取错误返回的信息，返回空就没有错误
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二参为读取成功返回的文本内容
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*/
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if(err){
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res.writeHeader(404,{
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'content-type' : 'text/html;charset="utf-8"'
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});
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res.write('<h1>404错误</h1><p>你要找的页面不存在</p>');
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res.end();
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}else{
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res.writeHeader(200,{
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'content-type' : 'text/html;charset="utf-8"'
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});
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res.write(data);//将index.html显示在客户端
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res.end();
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}
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});
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})
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// catch 404 and forward to error handler
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app.use(function(req, res, next) {
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next(createError(404));
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});
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// error handler
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app.use(function(err, req, res, next) {
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// set locals, only providing error in development
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res.locals.message = err.message;
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res.locals.error = req.app.get('env') === 'development' ? err : {};
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// render the error page
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res.status(err.status || 500);
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res.render('error');
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});
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// init();
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module.exports = app;
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