import test from 'node:test';
import assert from 'node:assert/strict';
import { keccak } from 'hash-wasm';
import { ADDITIONAL_MARKET_FEE } from '../shared/market.ts';
import { createMoneroDepositAddressRpc, createMoneroWalletObserver, loadMoneroObserverConfig,
  type MoneroFixtureTransport } from '../server/market/monero-observer.ts';

const config = { network: 'mainnet' as const, url: 'http://127.0.0.1:18083/json_rpc', username: 'fixture', password: 'not-a-live-secret' };
function response(id: string, result: Record<string, unknown>, status = 200, type = 'application/json') {
  return new Response(JSON.stringify({ jsonrpc: '2.0', id, result }), { status, headers: { 'content-type': type } });
}
function fakeTransport(incoming: Record<string, unknown>[] = []): { transport: MoneroFixtureTransport; calls: { method: string; params: unknown; auth: string | null }[] } {
  const calls: { method: string; params: unknown; auth: string | null }[] = [];
  const transport: MoneroFixtureTransport = async (url, init) => {
    assert.equal(url, config.url); assert.equal(init.method, 'POST'); assert.equal(init.redirect, 'error');
    assert.ok(init.signal);
    const body = JSON.parse(init.body as string) as { id: string; method: string; params: unknown };
    calls.push({ method: body.method, params: body.params, auth: new Headers(init.headers).get('authorization') });
    if (body.method === 'get_height') return response(body.id, { height: 100, status: 'OK' });
    if (body.method === 'get_address') return response(body.id, { address: ADDITIONAL_MARKET_FEE.address, status: 'OK' });
    if (body.method === 'get_transfers') return response(body.id, { in: incoming, status: 'OK' });
    throw new Error(`unexpected method ${body.method}`);
  };
  return { transport, calls };
}
async function syntheticSubaddress(fill = 3) {
  const prefix = Uint8Array.from([42, ...Array(64).fill(fill)]);
  const data = Buffer.concat([prefix, Buffer.from((await keccak(prefix, 256)).slice(0, 8), 'hex')]);
  const alphabet = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz';
  let encoded = '';
  for (let i = 0; i < data.length; i += 8) {
    const chunk = data.subarray(i, i + 8); let n = BigInt(`0x${chunk.toString('hex')}`), text = '';
    while (n) { text = alphabet[Number(n % 58n)] + text; n /= 58n; }
    encoded += text.padStart(chunk.length === 8 ? 11 : 7, '1');
  }
  return encoded;
}

test('read-only Monero observer preserves uint64 amount text and returns observations without crediting balances', async () => {
  const { transport, calls } = fakeTransport([{ txid: 'a'.repeat(64), address: ADDITIONAL_MARKET_FEE.address,
    amount: '9007199254740993', height: 91,
    timestamp: 1_800_000_000, unlock_time: 0, locked: false, double_spend_seen: false,
    subaddr_index: { major: 0, minor: 7 } }]);
  const observer = createMoneroWalletObserver(config, transport);
  assert.equal('createSubaddress' in observer, false);
  const page = await observer.scanIncoming(90);
  assert.equal(page.network, 'mainnet'); assert.equal(page.walletHeight, 100);
  assert.equal(page.primaryAddress, ADDITIONAL_MARKET_FEE.address);
  assert.equal(page.incoming.length, 1);
  assert.deepEqual(page.incoming[0], { observationId: `${'a'.repeat(64)}:0:7`, transactionId: 'a'.repeat(64), address: ADDITIONAL_MARKET_FEE.address,
    amountAtomicXmr: '9007199254740993', height: 91, confirmations: 10, timestamp: 1_800_000_000,
    unlockTime: '0', accountIndex: 0, addressIndex: 7, locked: false, doubleSpendSeen: false });
  assert.deepEqual(calls.map(call => call.method).sort(), ['get_address', 'get_height', 'get_transfers']);
  assert.ok(calls.every(call => call.auth === `Basic ${Buffer.from(`${config.username}:${config.password}`).toString('base64')}`));
  assert.deepEqual(calls.find(call => call.method === 'get_transfers')?.params,
    { in: true, filter_by_height: true, min_height: 90, max_height: 100 });
  assert.equal(Object.keys(observer).some(key => /transfer|sweep|send|credit/i.test(key)), false);
});

test('deposit-address RPC client is narrowly allow-listed and creates only one verified subaddress', async () => {
  const subaddress = await syntheticSubaddress();
  const calls: { method: string; params: unknown }[] = [];
  const transport: MoneroFixtureTransport = async (_url, init) => {
    const body = JSON.parse(init.body as string) as { id: string; method: string; params: unknown };
    calls.push({ method: body.method, params: body.params });
    if (body.method === 'get_address') return response(body.id, { address: ADDITIONAL_MARKET_FEE.address,
      addresses: [{ address: subaddress, label: 'wikideck-deposit-v1:fixture', address_index: 7, used: false }], status: 'OK' });
    if (body.method === 'create_address') return response(body.id, { address: subaddress, address_index: 7,
      address_indices: [7], addresses: [subaddress], status: 'OK' });
    return response(body.id, { height: 100, status: 'OK' });
  };
  const rpc = createMoneroDepositAddressRpc(config, transport);
  assert.deepEqual(await rpc.getSubaddress(0, 7), { address: subaddress, label: 'wikideck-deposit-v1:fixture' });
  assert.deepEqual(await rpc.createSubaddress(0, 'wikideck-deposit-v1:fixture'), { address: subaddress, addressIndex: 7 });
  assert.deepEqual(calls, [
    { method: 'get_address', params: { account_index: 0, address_index: [7] } },
    { method: 'create_address', params: { account_index: 0, label: 'wikideck-deposit-v1:fixture', count: 1 } },
  ]);
  await assert.rejects(rpc.getSubaddress(0, 8), /different subaddress index/);
  await assert.rejects(rpc.createSubaddress(0, 'bad\nlabel'), /parameters/);

  let unexpectedCalls = 0;
  const onlyAddressTransport: MoneroFixtureTransport = async (_url, init) => {
    unexpectedCalls++;
    const body = JSON.parse(init.body as string) as { id: string; method: string };
    return response(body.id, { height: 100, status: 'OK' });
  };
  await assert.rejects(createMoneroDepositAddressRpc(config, onlyAddressTransport).getSubaddress(0, 0), /expected/);
  assert.equal(unexpectedCalls, 1);
});

test('observer refuses non-loopback plaintext, URL credentials and malformed height ranges', async () => {
  assert.throws(() => createMoneroWalletObserver({ ...config, url: 'http://wallet.example/json_rpc' }), /HTTPS/);
  assert.throws(() => createMoneroWalletObserver({ ...config, url: 'http://localhost/json_rpc' }), /HTTPS/);
  assert.throws(() => createMoneroWalletObserver({ ...config, url: 'https://user:pass@wallet.example/json_rpc' }), /bare/);
  const { transport } = fakeTransport(); const observer = createMoneroWalletObserver(config, transport);
  await assert.rejects(observer.scanIncoming(-1), /height/);
  await assert.rejects(observer.scanIncoming(101), /ahead/);
});

test('observer rejects unsafe amounts, duplicate observations, malformed transfers and wrong RPC identity', async () => {
  const unsafeTransport: MoneroFixtureTransport = async (_url, init) => {
    const body = JSON.parse(init.body as string) as { id: string; method: string };
    if (body.method === 'get_height') return response(body.id, { height: 100, status: 'OK' });
    if (body.method === 'get_address') return response(body.id, { address: ADDITIONAL_MARKET_FEE.address, status: 'OK' });
    return new Response(`{"jsonrpc":"2.0","id":"${body.id}","result":{"status":"OK","in":[{"txid":"${'b'.repeat(64)}","address":"${ADDITIONAL_MARKET_FEE.address}","amount":18446744073709551616,"height":91,"timestamp":1,"unlock_time":0,"locked":false,"double_spend_seen":false,"subaddr_index":{"major":0,"minor":1}}]}}`,
      { headers: { 'content-type': 'application/json' } });
  };
  await assert.rejects(createMoneroWalletObserver(config, unsafeTransport).scanIncoming(90), /amount/);

  const duplicate = { txid: 'c'.repeat(64), address: ADDITIONAL_MARKET_FEE.address, amount: '1', height: 91, timestamp: 1, unlock_time: 0,
    locked: true, double_spend_seen: false, subaddr_index: { major: 0, minor: 1 } };
  const duplicateFixture = fakeTransport([duplicate, duplicate]);
  await assert.rejects(createMoneroWalletObserver(config, duplicateFixture.transport).scanIncoming(90), /Duplicate/);

  const wrongId: MoneroFixtureTransport = async (_url, init) => {
    JSON.parse(init.body as string) as { id: string };
    return response('00000000-0000-4000-8000-000000000001', { height: 100, status: 'OK' });
  };
  await assert.rejects(createMoneroWalletObserver(config, wrongId).scanIncoming(90), /ID mismatch/);
});

test('observer refuses redirects, wrong content type and oversized RPC response without exposing credentials', async () => {
  const badResponses = [new Response('{}', { status: 302, headers: { 'content-type': 'application/json' } }),
    new Response('<html/>', { headers: { 'content-type': 'text/html' } }),
    new Response('x'.repeat(1024 * 1024 + 1), { headers: { 'content-type': 'application/json' } })];
  for (const bad of badResponses) {
    let call = 0;
    const transport: MoneroFixtureTransport = async () => {
      call++;
      if (call === 1) return response('unused', { height: 100, status: 'OK' });
      return bad;
    };
    await assert.rejects(createMoneroWalletObserver(config, transport).scanIncoming(90), error =>
      error instanceof Error && !error.message.includes(config.password));
  }
});

test('Monero RPC configuration is opt-in and inaccessible without a protected external config file', async () => {
  await assert.rejects(loadMoneroObserverConfig({}), /disabled/);
  await assert.rejects(loadMoneroObserverConfig({ WIKIDECK_MONERO_OBSERVER: '1' }), /config file is required/);
});