// Local-only review server. Serves model evidence and proxies the existing app's real engine/GIS assets.
// Nothing from this tool is copied into the production web build.
import http from 'node:http'
import { createReadStream, existsSync, statSync } from 'node:fs'
import { dirname, resolve, extname, sep } from 'node:path'
import { fileURLToPath } from 'node:url'
const root = dirname(fileURLToPath(import.meta.url))
const upstream = new URL(process.env.COCKPIT_BASE || 'http://127.0.0.1:8001')
const port = Number(process.env.MODEL_REVIEW_PORT || 8092)
const mime = {
    '.html': 'text/html; charset=utf-8',
    '.json': 'application/json',
    '.glb': 'model/gltf-binary',
    '.png': 'image/png',
}
const server = http.createServer((req, res) => {
    const url = new URL(req.url, 'http://localhost')
    if (url.pathname === '/' || url.pathname === '/preview.html' || url.pathname.startsWith('/review-assets/')) {
        const relative = url.pathname.startsWith('/review-assets/')
            ? decodeURIComponent(url.pathname.slice(15))
            : 'preview.html'
        const file = resolve(root, relative)
        if (!file.startsWith(root + sep) || !existsSync(file) || !statSync(file).isFile()) {
            res.writeHead(404)
            res.end()
            return
        }
        res.writeHead(200, {
            'Content-Type': mime[extname(file)] || 'application/octet-stream',
            'Cache-Control': 'no-store',
        })
        createReadStream(file).pipe(res)
        return
    }
    const proxy = http.request(
        new URL(req.url, upstream),
        { method: req.method, headers: { ...req.headers, host: upstream.host } },
        (response) => {
            res.writeHead(response.statusCode, response.headers)
            response.pipe(res)
        }
    )
    proxy.on('error', () => {
        res.writeHead(502)
        res.end('Local cockpit preview server unavailable')
    })
    req.pipe(proxy)
})
server.listen(port, '127.0.0.1', () =>
    console.log(`Model review: http://127.0.0.1:${port}/preview.html (engine/GIS: ${upstream.origin})`)
)