// @ts-check
const fs = require('fs')
const path = require('path')
const express = require('express')

const isTest = process.env.NODE_ENV === 'test' || !!process.env.VITE_TEST_BUILD

async function createServer(
    root = process.cwd(),
    isProd = process.env.NODE_ENV === 'production'
) {
    const resolve = (p) => path.resolve(__dirname, p)

    const indexProd = fs.readFileSync(resolve('dist/client/index.html'), 'utf-8')

    const manifest = require('./dist/client/ssr-manifest.json')

    const app = express()

    /**
     * @type {import('vite').ViteDevServer}
     */
    let vite
    // if (!isProd) {
    //     vite = await require('vite').createServer({
    //         root,
    //         logLevel: isTest ? 'error' : 'info',
    //         server: {
    //             middlewareMode: 'ssr',
    //             watch: {
    //                 // During tests we edit the files too fast and sometimes chokidar
    //                 // misses change events, so enforce polling for consistency
    //                 usePolling: true,
    //                 interval: 100
    //             }
    //         }
    //     })
    //     // use vite's connect instance as middleware
    //     app.use(vite.middlewares)
    // } else {
        app.use(require('compression')())
        app.use(
            require('serve-static')(resolve('dist/client'), {
                index: false
            })
        )
    // }

    app.use('*', async (req, res) => {
        try {
            const url = req.originalUrl

            let template, render
            // if (!isProd) {
            //     // always read fresh template in dev
            //     template = fs.readFileSync(resolve('index.html'), 'utf-8')
            //     template = await vite.transformIndexHtml(url, template)
            //     render = (await vite.ssrLoadModule('/src/entry-server.js')).render
            // } else {
                template = indexProd
                // @ts-ignore
                render = require('./dist/server/entry-server.js').render
            // }

            const [appHtml, preloadLinks] = await render(url, manifest)

            const html = template
                .replace(`<!--preload-links-->`, preloadLinks)
                .replace(`<!--app-html-->`, appHtml)

            res.status(200).set({ 'Content-Type': 'text/html' }).end(html)
        } catch (e) {
            vite && vite.ssrFixStacktrace(e)
            console.log(e.stack)
            res.status(500).end(e.stack)
        }
    })

    return { app, vite }
}

if (!isTest) {
    createServer().then(({ app }) =>
        app.listen(5173, () => {
            console.log('http://localhost:5173')
        })
    )
}

// for test use
exports.createServer = createServer