import { serveFile } from "jsr:@std/http/file-server";
import { createSSRApp } from "vue";
import { renderToString } from "vue/server-renderer";
import { createRouter, createMemoryHistory } from 'vue-router';
import Home from "@/home/App.tsx";
import GERoot, { routes as geRoutes } from "@/generative-energy/GERoot.tsx";
import transpileResponse from "./transpile.ts";
import { DOMParser } from 'jsr:@b-fuze/deno-dom'

const utf8Decoder = new TextDecoder("utf-8");

const parser = new DOMParser();

Deno.serve({
    port: 8080,
    hostname: "0.0.0.0",
    onListen({ port, hostname }) {
        console.log(`Listening on port http://${hostname}:${port}/`);
    },
}, async (req, _conn) => {
    if (req.method === "GET") {
        const pathname = URL.parse(req.url)?.pathname ?? "/";
        if (pathname.startsWith('/static/') ||
            pathname.startsWith('/generative-energy/static/')) {
            if (pathname.startsWith('/static/')) {
                return serveFile(req, `public/home/${ pathname }`);
            } else {
                return serveFile(req, `public${pathname}`);
            }
        } else if (pathname === "/") {
            const rendered = await renderToString(createSSRApp(Home));
            const content = utf8Decoder.decode(await Deno.readFile("./public/home/index.html"))
                .replace(`<!-- SSR OUTLET -->`, rendered)
                .replace(`<!-- SSR HEAD OUTLET -->`, "");
            return new Response(content, { headers: { "Content-Type": "text/html" } });
        } else if (pathname.startsWith('/generative-energy')) {
            const app = createSSRApp(GERoot);
            const router = createRouter({
                routes: geRoutes,
                history: createMemoryHistory('/generative-energy'),
            });
            app.use(router);
            app.provide('dom-parse', (innerHTML: string) => {
                return parser.parseFromString(innerHTML, 'text/html').documentElement;
            });
            const ssrContext = { registry: {}};
            await router.replace(pathname.split('/generative-energy')[1]);
            await router.isReady();
            const rendered = await renderToString(app, ssrContext);
            const content = utf8Decoder.decode(await Deno.readFile("./public/generative-energy/index.html"))
                .replace('%TITLE%', 'Generative Energy')
                .replace('<!-- SSR HEAD OUTLET -->', `
        <script type="importmap">
            {
                "imports": {
                    "vue": "/deps/vue/dist/vue.esm-browser.prod.js",
                    "vue-router": "/deps/vue-router/dist/vue-router.esm-browser.js",
                    "vue/jsx-runtime": "/deps/vue/jsx-runtime/index.mjs",
                    "@vue/devtools-api": "/deps/@vue/devtools-api/lib/esm/index.js",
                    "@/": "/app/"
                }
            }
        </script>
        <script> window.appstate = ${ JSON.stringify(ssrContext.registry) }; </script>
                `)
                .replace(`<!-- SSR OUTLET -->`, rendered);
            return new Response(content, { headers: { "Content-Type": "text/html" } });
        } else if (pathname.startsWith("/app") && (pathname.endsWith(".ts") || pathname.endsWith(".tsx"))) {
            const response = await serveFile(req, "./" + pathname);
            return await transpileResponse(response, req.url, pathname);
        } else if (pathname.startsWith("/deps")) {
            return serveFile(req, `node_modules/${pathname.split("/deps")[1]}`);
        } 
        return new Response("Not found.", { status: 404 });
    } else {
        return new Response("Only GET allowed.", { status: 500 });
    }
});

Deno.addSignalListener("SIGINT", () => {
    console.info("Shutting down (received SIGINT)");
    Deno.exit();
});