import { serve } from "bun";
import index from "./index.html";

const port = process.env.PORT ? parseInt(process.env.PORT) : 3000;

// Strict base64 check (not a mere `Buffer.from` attempt, which silently drops invalid
// characters instead of failing): reject anything that is not a well-formed base64 body
// before decoding, so a typo'd env var is reported instead of served as 810 garbage bytes.
const BASE64_SHAPE = /^[A-Za-z0-9+/]+={0,2}$/;

function decodeBase64WalletOrThrow(raw: string) {
  const trimmed = raw.trim();
  if (trimmed.length === 0 || trimmed.length % 4 !== 0 || !BASE64_SHAPE.test(trimmed)) {
    throw new Error("not valid base64 (bad characters, or length not a multiple of 4)");
  }
  // Web `atob` (not Node's `Buffer`, whose `ArrayBufferLike` generic doesn't line up
  // with `Response`'s `BodyInit`) — decodes to a binary string, rebuilt into bytes below.
  const binary = atob(trimmed);
  const bytes = new Uint8Array(binary.length);
  for (let i = 0; i < binary.length; i++) bytes[i] = binary.charCodeAt(i);
  return bytes;
}

const server = serve({
  port,
  routes: {
    // Serve Cucumber HTML report
    "/reports/cucumber": async () => {
      const file = Bun.file("reports/cucumber-report.html");
      if (await file.exists()) {
        return new Response(file, {
          headers: { "Content-Type": "text/html" },
        });
      }
      return new Response("No test report found. Run 'bun run test:cucumber' first.", {
        status: 404,
      });
    },

    "/api/hello": {
      async GET(req) {
        return Response.json({
          message: "Hello, world!",
          method: "GET",
        });
      },
      async PUT(req) {
        return Response.json({
          message: "Hello, world!",
          method: "PUT",
        });
      },
    },

    "/api/hello/:name": async req => {
      const name = req.params.name;
      return Response.json({
        message: `Hello, ${name}!`,
      });
    },

    // Shared-wallet config, exposed at RUNTIME for the dev server + `bun run start`
    // (both serve from src/, so they miss build.ts's compile-time `define`). The app
    // entry (frontend.tsx) fetches this before it loads the app tree, so
    // `sharedWallet.ts` sees the password. Empty env → '' → no shared wallet.
    "/festipod-config.json": () =>
      Response.json({
        sharedWalletPassword: process.env.FESTIPOD_SHARED_WALLET_PASSWORD ?? "",
        // Auto-seed gate (OFF by default): only set when the env var is present, so
        // the front seeds an empty wallet only on explicit opt-in (see autoSeed.ts).
        autoSeed: process.env.FESTIPOD_AUTO_SEED ?? "",
      }),

    // The shared wallet file — the `fileUrl` the app hands the SDK, when configured.
    //
    // Two sources, read fresh on every request (never captured at module evaluation):
    //   - FESTIPOD_SHARED_WALLET_FILE: a filesystem path. What local dev and the test
    //     harness set today — a file sitting at the working-copy root.
    //   - FESTIPOD_SHARED_WALLET_FILE_BASE64: the file's bytes, base64-encoded. What a
    //     container sets instead, since *.ngw is gitignored and nothing mounts one there.
    //
    // Precedence: FILE wins whenever it is set, even if the path turns out unreadable —
    // it is NOT "whichever resolves". This keeps dev/test behaviour byte-for-byte
    // unchanged (they set only FILE, never BASE64) and makes the rule predictable: a
    // deployment picks exactly one variable to set, and setting both is a leftover, not
    // an intentional fallback chain.
    "/shared-wallet.ngw": async () => {
      const path = process.env.FESTIPOD_SHARED_WALLET_FILE;
      if (path) {
        const file = Bun.file(path);
        if (await file.exists()) return new Response(file);
        return new Response("No shared wallet file configured.", { status: 404 });
      }

      const encoded = process.env.FESTIPOD_SHARED_WALLET_FILE_BASE64;
      if (encoded) {
        // Malformed must fail loudly: a 404 here would look identical to "not
        // configured", which is exactly the confusion this project is removing.
        try {
          const bytes = decodeBase64WalletOrThrow(encoded);
          return new Response(bytes, {
            headers: { "Content-Type": "application/octet-stream" },
          });
        } catch (err) {
          const message = err instanceof Error ? err.message : String(err);
          return new Response(
            `FESTIPOD_SHARED_WALLET_FILE_BASE64 is set but ${message}.`,
            { status: 500 }
          );
        }
      }

      return new Response("No shared wallet file configured.", { status: 404 });
    },

    // Serve index.html for all unmatched routes (must be last)
    "/*": index,
  },

  development: process.env.NODE_ENV !== "production" && {
    // Enable browser hot reloading in development
    hmr: true,

    // Echo console logs from the browser to the server
    console: true,
  },
});

console.log(`🚀 Server running at ${server.url}`);