import debug from 'debug';
import http from 'http';
import { hri } from 'human-readable-ids';
import Koa from 'koa';
import Router from 'koa-router';
import tldjs from 'tldjs';
import { ClientManager } from './ClientManager.js';
import { TunnelServer } from './TunnelServer.js';
const log = debug('pipenet:server');
export function createServer(opt = {}) {
    const validHosts = opt.domains && opt.domains.length > 0 ? opt.domains : undefined;
    const myTldjs = tldjs.fromUserSettings({ validHosts });
    const landingPage = opt.landing || 'https://pipenet.dev/';
    function GetClientIdFromHostname(hostname) {
        return myTldjs.getSubdomain(hostname);
    }
    // Create shared tunnel server if tunnelPort is specified
    const tunnelServer = opt.tunnelPort ? new TunnelServer() : undefined;
    const manager = new ClientManager({
        ...opt,
        tunnelServer,
    });
    const schema = opt.secure ? 'https' : 'http';
    const tunnelPort = opt.tunnelPort;
    const app = new Koa();
    const router = new Router();
    // CORS middleware
    app.use(async (ctx, next) => {
        ctx.set('Access-Control-Allow-Origin', '*');
        ctx.set('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, OPTIONS');
        ctx.set('Access-Control-Allow-Headers', 'Content-Type, Authorization');
        if (ctx.method === 'OPTIONS') {
            ctx.status = 204;
            return;
        }
        await next();
    });
    router.get('/api/status', async (ctx) => {
        const stats = manager.stats;
        ctx.body = {
            mem: process.memoryUsage(),
            tunnels: stats.tunnels,
        };
    });
    router.get('/api/tunnels/:id/status', async (ctx) => {
        const clientId = ctx.params.id;
        const client = manager.getClient(clientId);
        if (!client) {
            ctx.throw(404);
            return;
        }
        const stats = client.stats();
        ctx.body = {
            connectedSockets: stats.connectedSockets,
        };
    });
    app.use(router.routes());
    app.use(router.allowedMethods());
    // Helper to extract domain from host (strips port if present)
    const getDomain = (host) => {
        // Remove port if present (e.g., "localhost:3000" -> "localhost")
        return host.split(':')[0];
    };
    // Helper to build the tunnel URL
    const buildUrl = (id, host) => {
        return schema + '://' + id + '.' + host;
    };
    // Helper to build response with tunnel port if configured
    const buildResponse = (info) => {
        const response = { ...info };
        // If using shared tunnel server, override port and add sharedTunnel flag
        if (tunnelPort) {
            response.port = tunnelPort;
            response.sharedTunnel = true;
        }
        return response;
    };
    app.use(async (ctx, next) => {
        const path = ctx.request.path;
        if (path !== '/') {
            await next();
            return;
        }
        const isNewClientRequest = ctx.query['new'] !== undefined;
        if (isNewClientRequest) {
            const reqId = hri.random();
            const domain = getDomain(ctx.request.host);
            const url = buildUrl(reqId, ctx.request.host);
            log('making new client with id %s', reqId);
            const info = await manager.newClient(reqId, url, domain);
            ctx.body = buildResponse(info);
            return;
        }
        ctx.redirect(landingPage);
    });
    app.use(async (ctx, next) => {
        const parts = ctx.request.path.split('/');
        if (parts.length !== 2) {
            await next();
            return;
        }
        const reqId = parts[1];
        if (!/^(?:[a-z0-9][a-z0-9-]{4,63}[a-z0-9]|[a-z0-9]{4,63})$/.test(reqId)) {
            const msg = 'Invalid subdomain. Subdomains must be lowercase and between 4 and 63 alphanumeric characters.';
            ctx.status = 403;
            ctx.body = { message: msg };
            return;
        }
        const domain = getDomain(ctx.request.host);
        const url = buildUrl(reqId, ctx.request.host);
        log('making new client with id %s', reqId);
        const info = await manager.newClient(reqId, url, domain);
        ctx.body = buildResponse(info);
    });
    const server = http.createServer();
    server.tunnelServer = tunnelServer;
    const appCallback = app.callback();
    server.on('request', (req, res) => {
        const hostname = req.headers.host;
        if (!hostname) {
            res.statusCode = 400;
            res.end('Host header is required');
            return;
        }
        const clientId = GetClientIdFromHostname(hostname);
        if (!clientId) {
            appCallback(req, res);
            return;
        }
        const client = manager.getClient(clientId);
        if (!client) {
            res.statusCode = 404;
            res.end('404');
            return;
        }
        // Call the onRequest hook
        if (opt.onRequest) {
            opt.onRequest({
                headers: req.headers,
                method: req.method || 'GET',
                path: req.url || '/',
                remoteAddress: req.socket.remoteAddress,
                tunnelId: clientId,
            });
        }
        client.handleRequest(req, res);
    });
    server.on('upgrade', (req, socket) => {
        const hostname = req.headers.host;
        if (!hostname) {
            socket.destroy();
            return;
        }
        const clientId = GetClientIdFromHostname(hostname);
        if (!clientId) {
            socket.destroy();
            return;
        }
        const client = manager.getClient(clientId);
        if (!client) {
            socket.destroy();
            return;
        }
        client.handleUpgrade(req, socket);
    });
    return server;
}
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