import type { RuntimeMode } from "../shared/api";
import type { Logger } from "./logger";
import type { StaticAssets } from "./static";

import { createApiError, jsonResponse } from "./helpers";
import { handleMeta } from "./routes/meta";
import { serveStaticAsset } from "./static";
import { readAppVersion } from "./version";

export interface StartServerOptions {
  config: { host: string; port: number };
  logger: Logger;
  mode: RuntimeMode;
  staticAssets?: StaticAssets;
  version?: string;
}

export function startServer(options: StartServerOptions) {
  const { config, logger, mode, staticAssets, version } = options;

  const resolveVersion = (): Promise<string> => {
    if (version) return Promise.resolve(version);
    return readAppVersion();
  };

  const server = Bun.serve({
    fetch(req) {
      if (staticAssets) {
        return serveStaticAsset(new URL(req.url).pathname, staticAssets);
      }
      return new Response("Frontend is served by Vite dev server on :5173", { status: 404 });
    },
    hostname: config.host,
    port: config.port,
    routes: {
      "/api/*": () => jsonResponse(createApiError("API route not found", 404), { mode, status: 404 }),
      "/api/meta": {
        GET: async () => {
          const resolvedVersion = await resolveVersion();
          return handleMeta(mode, resolvedVersion);
        },
      },
    },
  });

  logger.info({ host: config.host, port: config.port, url: server.url.toString() }, "服务启动");

  return server;
}