const Koa = require('koa');
const path = require('path');
const webpack = require('webpack');
const koaWebpack = require('koa-webpack');

const app = new Koa();

const clientConfig = require('./build/webpack.client.config');

// koa-webpack 自动添加
clientConfig.entry.app = [clientConfig.entry.app];
clientConfig.output.filename = '[name].js';
clientConfig.plugins.push(new webpack.NoEmitOnErrorsPlugin());

const clientCompiler = webpack(clientConfig);

function ready(options) {
  return koaWebpack(options);
}

let koaWebpackOptions = {
  compiler: clientCompiler,
  devMiddleware: {}
};
ready(koaWebpackOptions).then(koaWebpackMiddleware => {
  app.use(koaWebpackMiddleware);
  app.use(async (ctx, next) => {
    if ((ctx.request.path = '/')) {
      const filename = path.resolve(clientConfig.output.path, 'index.html');
      ctx.response.type = 'html';
      ctx.response.body = await koaWebpackMiddleware.devMiddleware.fileSystem.createReadStream(filename);
    } else {
      await next();
    }
  });

  app.listen(3000, () => {
    console.log('server is started on 3000 port ', 'http://127.0.0.1:3000');
  });
});