/**
 * Integration tests for GeoApiClient against a mock API server.
 * Covers the full flow from docs: register, login, collections, features.
 */
import { afterAll, beforeAll, describe, expect, test } from "bun:test";
import { verifyAsync } from "@noble/ed25519";
import { base64UrlToBytes, bytesToBase64Url, textToBytes } from "../src/encoding";
import { GeoApiClient } from "../src/GeoApiClient";
import { generateKeyPair, signMessage } from "../src/keys";

class MemoryStorage {
  private data = new Map<string, string>();
  getItem(key: string): string | null {
    return this.data.get(key) ?? null;
  }
  setItem(key: string, value: string): void {
    this.data.set(key, value);
  }
  removeItem(key: string): void {
    this.data.delete(key);
  }
}

async function createMockServer(): Promise<{ url: string; server: ReturnType<typeof Bun.serve> }> {
  const serverKeypair = await generateKeyPair();
  const users = new Set<string>();
  const sessions = new Map<string, string>();
  let collectionId = 0;
  let featureId = 0;

  const server = Bun.serve({
    port: 0,
    async fetch(req) {
      const url = new URL(req.url);
      const path = url.pathname;
      const method = req.method;

      // GET /v1/service-key
      if (method === "GET" && path === "/v1/service-key") {
        return Response.json({ publicKey: serverKeypair.publicKey });
      }

      // POST /v1/auth/challenge
      if (method === "POST" && path === "/v1/auth/challenge") {
        const body = (await req.json()) as { publicKey?: string };
        if (!body?.publicKey) {
          return Response.json({ error: "missing publicKey" }, { status: 400 });
        }
        const nonce = bytesToBase64Url(crypto.getRandomValues(new Uint8Array(24)));
        return Response.json({ nonce, messageToSign: `login:${nonce}` });
      }

      // POST /v1/auth/register-by-signature
      if (method === "POST" && path === "/v1/auth/register-by-signature") {
        const body = (await req.json()) as { publicKey?: string; signature?: string };
        if (!body?.publicKey || !body?.signature) {
          return Response.json({ error: "missing fields" }, { status: 400 });
        }
        const ok = await verifyAsync(
          base64UrlToBytes(body.signature),
          textToBytes(serverKeypair.publicKey),
          base64UrlToBytes(body.publicKey)
        );
        if (!ok) {
          return Response.json({ error: "invalid signature" }, { status: 400 });
        }
        users.add(body.publicKey);
        return new Response(null, { status: 201 });
      }

      // POST /v1/auth/login
      if (method === "POST" && path === "/v1/auth/login") {
        const body = (await req.json()) as { publicKey?: string; nonce?: string; signature?: string };
        if (!body?.publicKey || !body?.nonce || !body?.signature) {
          return Response.json({ error: "missing fields" }, { status: 400 });
        }
        const msg = `login:${body.nonce}`;
        const ok = await verifyAsync(
          base64UrlToBytes(body.signature),
          textToBytes(msg),
          base64UrlToBytes(body.publicKey)
        );
        if (!ok) {
          return Response.json({ error: "invalid signature" }, { status: 401 });
        }
        if (!users.has(body.publicKey)) {
          return Response.json({ error: "user not registered" }, { status: 401 });
        }
        const token = bytesToBase64Url(crypto.getRandomValues(new Uint8Array(32)));
        sessions.set(token, body.publicKey);
        return Response.json({ accessToken: token });
      }

      // Bearer auth helper
      const auth = req.headers.get("Authorization");
      const token = auth?.startsWith("Bearer ") ? auth.slice(7) : null;
      const user = token ? sessions.get(token) : null;
      if (!user && path.startsWith("/v1/collections") && method !== "GET") {
        return Response.json({ error: "unauthorized" }, { status: 401 });
      }

      // POST /v1/collections
      if (method === "POST" && path === "/v1/collections") {
        const body = (await req.json()) as { name?: string };
        collectionId++;
        const c = { id: `col-${collectionId}`, name: body?.name ?? "Unnamed" };
        return Response.json(c, { status: 201 });
      }

      // GET /v1/collections
      if (method === "GET" && path === "/v1/collections") {
        return Response.json({ collections: [] });
      }

      // POST /v1/collections/:id/features
      if (method === "POST" && path.match(/^\/v1\/collections\/[^/]+\/features$/)) {
        const body = (await req.json()) as { geometry?: unknown; properties?: unknown };
        featureId++;
        const f = {
          id: `feat-${featureId}`,
          geometry: body?.geometry ?? { type: "Point", coordinates: [0, 0] },
          properties: body?.properties ?? {},
        };
        return Response.json(f, { status: 201 });
      }

      // GET /v1/collections/:id/features
      if (method === "GET" && path.match(/^\/v1\/collections\/[^/]+\/features$/)) {
        return Response.json({ features: [] });
      }

      return new Response("Not Found", { status: 404 });
    },
  });

  const url = `http://localhost:${server.port}`;
  return { url, server };
}

describe("GeoApiClient integration (docs flow)", () => {
  let mock: { url: string; server: ReturnType<typeof Bun.serve> };
  let client: GeoApiClient;
  let storage: MemoryStorage;

  beforeAll(async () => {
    mock = await createMockServer();
    storage = new MemoryStorage();
    client = new GeoApiClient(mock.url, storage);
  });

  afterAll(() => {
    mock.server.stop();
  });

  test("getServicePublicKey fetches server public key", async () => {
    const { publicKey } = await client.getServicePublicKey();
    expect(publicKey.length).toBeGreaterThan(10);
  });

  test("full flow: ensureKeys -> register -> login -> createCollection -> createPointFeature -> listFeatures", async () => {
    const keys = await client.ensureKeysInStorage();
    expect(keys.publicKey).toBeDefined();
    expect(keys.privateKey).toBeDefined();

    await client.registerBySigningServiceKey(keys.publicKey, keys.privateKey);

    const token = await client.loginWithSignature(keys.publicKey, keys.privateKey);
    expect(token.length).toBeGreaterThan(10);
    client.setAccessToken(token);

    const created = await client.createCollection("My Places");
    expect(created.id).toBeDefined();
    expect(created.name).toBe("My Places");

    const feature = await client.createPointFeature(created.id, -16.6291, 28.4636, {
      name: "Santa Cruz",
    });
    expect(feature.id).toBeDefined();

    const { features } = await client.listFeatures(created.id);
    expect(Array.isArray(features)).toBe(true);
  });
});