import { readdir } from 'node:fs/promises';

import { config } from 'dotenv';
import type { RequestLike } from 'itty-router';

import ServerCoordinator from './durable-objects/ServerCoordinatorBun';
import { BunSqliteKVNamespace } from './storage/BunSqliteKVNamespace';

import Server from '.';

const router = Server.Router();

config({
  path: '.env',
  debug: true,
  // defaults: {
  //     EVENTSOURCE_HOST: "https://eventsource.seemueller.io",
  // }
});

export default {
  port: 3003,
  fetch: async (request: RequestLike, env: { [key: string]: any }, ctx: any) => {
    // console.log("[trace] request: ", request.method, request.url, "headers: ", request.headers.get("referer"), "body: ", request.body, "env: ", env, "ctx: ", ctx, "")

    env['SERVER_COORDINATOR'] = ServerCoordinator;
    env['ASSETS'] = assetHandler.ASSETS;
    env['EVENTSOURCE_HOST'] = process.env.EVENTSOURCE_HOST;
    env['GROQ_API_KEY'] = process.env.GROQ_API_KEY;
    env['ANTHROPIC_API_KEY'] = process.env.ANTHROPIC_API_KEY;
    env['FIREWORKS_API_KEY'] = process.env.FIREWORKS_API_KEY;
    env['XAI_API_KEY'] = process.env.XAI_API_KEY;
    env['CEREBRAS_API_KEY'] = process.env.CEREBRAS_API_KEY;
    env['CLOUDFLARE_API_KEY'] = process.env.CLOUDFLARE_API_KEY;
    env['CLOUDFLARE_ACCOUNT_ID'] = process.env.CLOUDFLARE_ACCOUNT_ID;
    env['MLX_API_KEY'] = process.env.MLX_API_KEY;
    env['OLLAMA_API_KEY'] = process.env.OLLAMA_API_KEY;
    env['KV_STORAGE'] = new BunSqliteKVNamespace({ namespace: 'open-gsio' });

    try {
      const controller = new AbortController();
      const timeout = new Promise((_, reject) =>
        setTimeout(() => {
          controller.abort();
          reject(new Error('Request timeout after 5s'));
        }, 5000),
      );

      return await Promise.race([router.fetch(request, env, ctx), timeout]);
    } catch (e) {
      console.error('Error handling request:', e);
      return new Response('Server Error', { status: 500 });
    }
  },
};

export const assetHandler = {
  ASSETS: {
    /**
     * Fetches the requested static asset from local dist
     *
     * @param {Request} request - The incoming Fetch API Request object.
     * @returns {Promise<Response>} A Promise that resolves with the Response for the requested asset,
     *                              or a 404 Response if the asset is not found or an error occurs.
     */
    async fetch(request: Request): Promise<Response> {
      // Serialize incoming request URL
      const originalUrl = new URL(request.url);
      const url = new URL(request.url);

      // List all files in the public directory
      const PUBLIC_DIR = new URL('../client/public/', import.meta.url).pathname;
      const publicFiles = await readdir(PUBLIC_DIR, { recursive: true });

      // Get the filename from pathname and remove any path traversal attempts
      const filename = url.pathname.split('/').pop()?.replace(/\.\./g, '') || '';

      const isStatic = publicFiles.some(file => file === filename);

      if (url.pathname === '/') {
        url.pathname = '/index.html';
      } else if (isStatic && !url.pathname.startsWith('/static')) {
        // leave it alone
      } else if (isStatic) {
        url.pathname = `/static${url.pathname}`;
      }

      const dist = new URL('../client/dist/client', import.meta.url).pathname;

      try {
        return new Response(Bun.file(`${dist}${url.pathname}`));
      } catch (error) {
        // Log the error with the original requested path
        console.error(`Error reading asset from path ${originalUrl.pathname}:`, error);
        return new Response(null, { status: 404 });
      }
    },
  },
};