// Copyright (C) 2026 Whiterun LLC,
// This software is licensed under the GNU Lesser General Public License (LGPL), version 3.0 or later.
// A copy of the license can be found in the LICENSE file or at https://www.gnu.org/licenses/lgpl-3.0.html

import { describe, it, expect } from "vitest";
import { encodeHdPublicKey } from "@bitauth/libauth";
import type { PathXpub } from "@wizardconnect/core";
import { DappConnectionManager } from "./dapp-connection-manager.js";

// Build a valid xpub string from a deterministic test node.
// Uses the secp256k1 generator point (a known valid public key).
function makeTestXpub(): string {
  const node = {
    chainCode: new Uint8Array(32).fill(0xbb),
    // secp256k1 generator point (compressed) — always valid
    publicKey: Uint8Array.from(
      "0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798"
        .match(/.{2}/g)!
        .map((h) => parseInt(h, 16)),
    ),
    childIndex: 0,
    depth: 3,
    parentFingerprint: new Uint8Array(4),
  };
  const result = encodeHdPublicKey({ node, network: "mainnet" });
  if (typeof result === "string")
    throw new Error("Failed to encode test xpub: " + result);
  return result.hdPublicKey;
}

describe("DappConnectionManager", () => {
  describe("getSessionPaths", () => {
    it("returns empty array before wallet_ready", () => {
      const mgr = new DappConnectionManager();
      expect(mgr.getSessionPaths()).toEqual([]);
    });
  });

  describe("restoreSessionPaths", () => {
    it("restores xpubs so getPubkey works", () => {
      const mgr = new DappConnectionManager();
      const xpub = makeTestXpub();
      const paths: PathXpub[] = [{ name: "receive", xpub }];

      mgr.restoreSessionPaths(paths);

      expect(mgr.hasPath(0)).toBe(true);
      const pk = mgr.getPubkey(0, 0n);
      expect(pk).toBeInstanceOf(Uint8Array);
      expect(pk!.length).toBe(33);
    });

    it("makes paths available via getSessionPaths", () => {
      const mgr = new DappConnectionManager();
      const xpub = makeTestXpub();
      const paths: PathXpub[] = [
        { name: "receive", xpub },
        { name: "change", xpub },
      ];

      mgr.restoreSessionPaths(paths);

      const stored = mgr.getSessionPaths();
      expect(stored).toHaveLength(2);
      expect(stored[0].name).toBe("receive");
      expect(stored[1].name).toBe("change");
    });

    it("returns a copy, not a reference", () => {
      const mgr = new DappConnectionManager();
      const xpub = makeTestXpub();
      mgr.restoreSessionPaths([{ name: "receive", xpub }]);

      const paths = mgr.getSessionPaths();
      paths.push({ name: "change", xpub });

      expect(mgr.getSessionPaths()).toHaveLength(1);
    });

    it("throws on invalid xpub strings", () => {
      const mgr = new DappConnectionManager();
      const paths: PathXpub[] = [{ name: "receive", xpub: "not-a-valid-xpub" }];

      expect(() => mgr.restoreSessionPaths(paths)).toThrow("Invalid xpub");
    });

    it("can derive multiple child indices after restore", () => {
      const mgr = new DappConnectionManager();
      const xpub = makeTestXpub();
      mgr.restoreSessionPaths([{ name: "receive", xpub }]);

      for (const idx of [0n, 1n, 5n, 10n]) {
        const pk = mgr.getPubkey(0, idx);
        expect(pk, `index ${idx}`).toBeInstanceOf(Uint8Array);
        expect(pk!.length, `index ${idx}`).toBe(33);
      }
    });

    it("does not affect paths not in the restore set", () => {
      const mgr = new DappConnectionManager();
      const xpub = makeTestXpub();
      mgr.restoreSessionPaths([{ name: "receive", xpub }]);

      expect(mgr.hasPath(0)).toBe(true); // receive = 0
      expect(mgr.hasPath(1)).toBe(false); // change = 1
    });
  });
});