// server/test/errorLogRoutes.test.js
const test = require('node:test');
const assert = require('node:assert/strict');
const http = require('node:http');
require('dotenv').config();

// ─── Helpers ────────────────────────────────────────────────────────────────

function httpRequest(server, options, body) {
  return new Promise((resolve, reject) => {
    const addr = server.address();
    const req = http.request(
      { host: '127.0.0.1', port: addr.port, ...options },
      (res) => {
        let data = '';
        res.on('data', (chunk) => { data += chunk; });
        res.on('end', () => {
          try {
            resolve({ status: res.statusCode, body: JSON.parse(data) });
          } catch {
            resolve({ status: res.statusCode, body: data });
          }
        });
      }
    );
    req.on('error', reject);
    if (body) {
      req.setHeader('Content-Type', 'application/json');
      req.write(JSON.stringify(body));
    }
    req.end();
  });
}

function startTestServer() {
  // Fresh copies each run so module-level state is clean
  delete require.cache[require.resolve('../utils/errorLogger')];
  delete require.cache[require.resolve('../controllers/errorLogController')];
  delete require.cache[require.resolve('../routes/errorLogRoutes')];

  const express = require('express');
  const cookieParser = require('cookie-parser');
  const { protect, adminOnly } = require('../middleware/authMiddleware');
  const { getErrorLogs, clearErrorLogs } = require('../controllers/errorLogController');

  const app = express();
  app.use(express.json());
  app.use(cookieParser());
  app.get('/api/admin/errors', protect, adminOnly, getErrorLogs);
  app.delete('/api/admin/errors', protect, adminOnly, clearErrorLogs);

  const server = http.createServer(app);
  return new Promise((resolve) => server.listen(0, '127.0.0.1', () => resolve(server)));
}

function makeAdminToken() {
  const jwt = require('jsonwebtoken');
  const { env } = require('../configs/env');
  return jwt.sign(
    { id: '507f1f77bcf86cd799439011' },
    env.jwtSecret || 'test-secret-32-characters-minimum!!',
    { expiresIn: '1h' }
  );
}

function mockAdminUser(role = 'admin') {
  const AdminUser = require('../models/AdminUser');
  const original = AdminUser.findById.bind(AdminUser);
  AdminUser.findById = () => ({
    select: () => ({
      lean: async () => ({
        _id: '507f1f77bcf86cd799439011',
        username: 'testadmin',
        role,
        isActive: true,
      }),
    }),
  });
  return () => { AdminUser.findById = original; };
}

// ─── Tests ───────────────────────────────────────────────────────────────────

test('GET /api/admin/errors returns paginated error log shape', async () => {
  const server = await startTestServer();
  const restore = mockAdminUser('admin');
  const token = makeAdminToken();

  try {
    const { logError } = require('../utils/errorLogger');
    logError(new Error('test error for GET'));

    const result = await httpRequest(server, {
      path: '/api/admin/errors?page=1&pageSize=10',
      method: 'GET',
      headers: { Cookie: `token=${token}` },
    });

    assert.equal(result.status, 200);
    assert.equal(result.body.success, true);
    assert.ok(Array.isArray(result.body.items), 'items must be an array');
    assert.ok(typeof result.body.total === 'number', 'total must be a number');
    assert.ok(typeof result.body.page === 'number', 'page must be a number');
    assert.ok(typeof result.body.pageSize === 'number', 'pageSize must be a number');
    assert.ok(typeof result.body.totalPages === 'number', 'totalPages must be a number');
  } finally {
    restore();
    await new Promise((r) => server.close(r));
  }
});

test('GET /api/admin/errors returns 401 with no token', async () => {
  const server = await startTestServer();
  try {
    const result = await httpRequest(server, {
      path: '/api/admin/errors',
      method: 'GET',
    });
    assert.equal(result.status, 401);
  } finally {
    await new Promise((r) => server.close(r));
  }
});

test('GET /api/admin/errors returns 403 for non-admin role', async () => {
  const server = await startTestServer();
  const restore = mockAdminUser('viewer');
  const token = makeAdminToken();
  try {
    const result = await httpRequest(server, {
      path: '/api/admin/errors',
      method: 'GET',
      headers: { Cookie: `token=${token}` },
    });
    assert.equal(result.status, 403);
  } finally {
    restore();
    await new Promise((r) => server.close(r));
  }
});

test('DELETE /api/admin/errors clears the memory buffer', async () => {
  const server = await startTestServer();
  const restore = mockAdminUser('admin');
  const token = makeAdminToken();
  try {
    const { logError } = require('../utils/errorLogger');
    logError(new Error('error before clear'));

    const deleteResult = await httpRequest(server, {
      path: '/api/admin/errors',
      method: 'DELETE',
      headers: { Cookie: `token=${token}` },
    });
    assert.equal(deleteResult.status, 200);
    assert.equal(deleteResult.body.success, true);
    assert.equal(deleteResult.body.cleared, true);

    const getResult = await httpRequest(server, {
      path: '/api/admin/errors?page=1&pageSize=10',
      method: 'GET',
      headers: { Cookie: `token=${token}` },
    });
    assert.equal(getResult.body.total, 0);
    assert.deepEqual(getResult.body.items, []);
  } finally {
    restore();
    await new Promise((r) => server.close(r));
  }
});

test('DELETE /api/admin/errors returns 401 with no token', async () => {
  const server = await startTestServer();
  try {
    const result = await httpRequest(server, {
      path: '/api/admin/errors',
      method: 'DELETE',
    });
    assert.equal(result.status, 401);
  } finally {
    await new Promise((r) => server.close(r));
  }
});

test('DELETE /api/admin/errors returns 403 for non-admin role', async () => {
  const server = await startTestServer();
  const restore = mockAdminUser('viewer');
  const token = makeAdminToken();
  try {
    const result = await httpRequest(server, {
      path: '/api/admin/errors',
      method: 'DELETE',
      headers: { Cookie: `token=${token}` },
    });
    assert.equal(result.status, 403);
  } finally {
    restore();
    await new Promise((r) => server.close(r));
  }
});