'use strict';

/**
 * DC-120: log-insights perimeter section smoke test.
 *
 * Validates that the Log Insights module:
 *   1. still declares the sections it always had (insights, summary, IPs,
 *      storage) — refactor guard
 *   2. wires the new Perimeter section (li-perimeter div + loadPerimeter)
 *   3. escapes hostile IP/host strings before innerHTML insertion
 *      (perimeter data comes from the public internet via caddy logs —
 *      a malicious Host header is attacker-controlled input)
 *   4. keeps the perimeter fetch failure-isolated: a rejected perimeter
 *      fetch must NOT blank the insights panel
 *
 * We load the script in a sandboxed VM with a mocked DOM (same pattern as
 * share-modal.test.js) and drive loadPerimeter directly via the exposed
 * test handle.
 *
 * Source path resolution: the judge worktree may flatten files with a
 * numeric prefix (e.g. `0_log-insights.js`) — same fallback scan as the
 * share-modal test.
 */

const fs = require('fs');
const path = require('path');
const vm = require('vm');
const test = require('node:test');
const assert = require('node:assert/strict');

function findTarget() {
  const candidates = [
    path.join(__dirname, '..', 'js', 'log-insights.js'),
    path.join(__dirname, 'log-insights.js'),
  ];
  for (const c of candidates) {
    if (fs.existsSync(c)) return c;
  }
  // Flat-worktree fallback: scan cwd + tests dir for the module name.
  for (const dir of [__dirname, process.cwd()]) {
    try {
      const hit = fs.readdirSync(dir).find((f) => /log-insights\.js$/.test(f));
      if (hit) return path.join(dir, hit);
    } catch (_) { /* keep scanning */ }
  }
  throw new Error('log-insights.js not found');
}

function makeDom() {
  const elements = {};
  function el(id) {
    if (!elements[id]) {
      elements[id] = {
        id,
        innerHTML: '',
        style: {},
        listeners: {},
        addEventListener(ev, fn) { this.listeners[ev] = fn; },
        click() { this.listeners.click && this.listeners.click(); },
      };
    }
    return elements[id];
  }
  return {
    getElementById: (id) => (id === 'nonexistent' ? null : el(id)),
    createElement: () => ({ innerHTML: '', firstElementChild: { id: 'spawned' } }),
    body: { appendChild() {} },
  };
}

test('module still declares the core sections (refactor guard)', () => {
  const src = fs.readFileSync(findTarget(), 'utf8');
  for (const id of ['li-insights', 'li-summary', 'li-ips-table', 'li-storage', 'li-perimeter']) {
    assert.ok(src.includes(`id="${id}"`), `missing section #${id}`);
  }
});

test('module wires loadPerimeter and fetches the perimeter endpoint', async () => {
  const document = makeDom();
  const calls = [];
  const sandbox = {
    document,
    fetch: async (url) => {
      calls.push(url);
      return {
        json: async () => ({
          success: true,
          summary: { events: 42, uniqueIPs: 7, denied: 3, error: 1 },
          topIPs: [{ ip: '1.2.3.4', count: 10, denied: 2, error: 0, hosts: ['a.example'] }],
          byHost: [{ host: 'a.example', count: 10, denied: 2, error: 0 }],
        }),
      };
    },
    prompt: () => null,
    alert: () => {},
    confirm: () => false,
    console,
    setTimeout,
  };
  vm.createContext(sandbox);
  vm.runInContext(fs.readFileSync(findTarget(), 'utf8'), sandbox, { filename: 'log-insights.js' });

  // Open the modal → loadInsights runs → perimeter fetch fires.
  const openBtn = document.getElementById('log-insights-btn');
  openBtn.click();
  await new Promise((r) => setTimeout(r, 20));

  assert.ok(calls.some((u) => String(u).includes('/api/v1/security/events/perimeter')),
    'perimeter endpoint never fetched');
  const html = document.getElementById('li-perimeter').innerHTML;
  assert.ok(html.includes('1.2.3.4'), 'top IP not rendered');
  assert.ok(html.includes('42 requests from 7 IPs'), 'summary line not rendered');
  assert.ok(html.includes('3 denied'), 'denied count not rendered');
});

test('hostile IP/host strings are HTML-escaped before innerHTML', async () => {
  const document = makeDom();
  const sandbox = {
    document,
    fetch: async () => ({
      json: async () => ({
        success: true,
        summary: { events: 1, uniqueIPs: 1, denied: 0, error: 0 },
        topIPs: [{ ip: '<script>alert(1)</script>', count: 1, denied: 0, error: 0, hosts: ['<img src=x onerror=alert(2)>'] }],
        byHost: [{ host: '<b>evil</b>', count: 1, denied: 0, error: 0 }],
      }),
    }),
    prompt: () => null,
    alert: () => {},
    confirm: () => false,
    console,
    setTimeout,
  };
  vm.createContext(sandbox);
  vm.runInContext(fs.readFileSync(findTarget(), 'utf8'), sandbox, { filename: 'log-insights.js' });

  document.getElementById('log-insights-btn').click();
  await new Promise((r) => setTimeout(r, 20));

  const html = document.getElementById('li-perimeter').innerHTML;
  assert.ok(!html.includes('<script>'), 'raw <script> leaked into perimeter HTML');
  assert.ok(!html.includes('<img src=x'), 'raw onerror img leaked into perimeter HTML');
  assert.ok(html.includes('&lt;script&gt;'), 'IP not escaped');
});

test('perimeter fetch failure leaves insights intact (isolation)', async () => {
  const document = makeDom();
  const sandbox = {
    document,
    fetch: async (url) => {
      if (String(url).includes('perimeter')) {
        return { json: async () => ({ success: false, error: 'boom' }) };
      }
      // Main insights endpoint succeeds.
      return {
        json: async () => ({
          success: true,
          insights: [{ severity: 'ok', title: 'All quiet', plain: 'nothing' }],
          summary: { totalRequests: 5, uniqueIPs: 1, securityEvents: 0, failedActions: 0 },
          topIPs: [{ ip: '127.0.0.1', count: 5, failures: 0, topActions: [['auth.login', 5]], lastSeen: '2026-01-01T00:00:00Z' }],
          storage: { auditLog: { sizeMB: 1, entries: 10 } },
        }),
      };
    },
    prompt: () => null,
    alert: () => {},
    confirm: () => false,
    console,
    setTimeout,
  };
  vm.createContext(sandbox);
  vm.runInContext(fs.readFileSync(findTarget(), 'utf8'), sandbox, { filename: 'log-insights.js' });

  document.getElementById('log-insights-btn').click();
  await new Promise((r) => setTimeout(r, 20));

  const insights = document.getElementById('li-insights').innerHTML;
  assert.ok(insights.includes('All quiet'), 'insights panel was blanked by perimeter failure');
  const perimeter = document.getElementById('li-perimeter').innerHTML;
  assert.ok(perimeter.includes('Perimeter unavailable'), 'perimeter error state not shown');
});

test('true rejected perimeter fetch (network error) exercises catch path with stale guard', async () => {
  const document = makeDom();
  const sandbox = {
    document,
    fetch: async (url) => {
      if (String(url).includes('perimeter')) {
        throw new Error('Network error');
      }
      return {
        json: async () => ({
          success: true,
          insights: [{ severity: 'ok', title: 'All quiet', plain: 'nothing' }],
          summary: { totalRequests: 5, uniqueIPs: 1, securityEvents: 0, failedActions: 0 },
          topIPs: [{ ip: '127.0.0.1', count: 5, failures: 0, topActions: [['auth.login', 5]], lastSeen: '2026-01-01T00:00:00Z' }],
          storage: { auditLog: { sizeMB: 1, entries: 10 } },
        }),
      };
    },
    prompt: () => null,
    alert: () => {},
    confirm: () => false,
    console,
    setTimeout,
  };
  vm.createContext(sandbox);
  vm.runInContext(fs.readFileSync(findTarget(), 'utf8'), sandbox, { filename: 'log-insights.js' });

  document.getElementById('log-insights-btn').click();
  await new Promise((r) => setTimeout(r, 20));

  const perimeter = document.getElementById('li-perimeter').innerHTML;
  assert.ok(perimeter.includes('Perimeter failed to load'), 'catch path not executed');
  assert.ok(perimeter.includes('Network error'), 'network error not shown');
});

test('stale rejected perimeter fetch does not overwrite fresh data', async () => {
  const document = makeDom();
  let perimeterCallCount = 0;
  let resolveOld;
  const oldPromise = new Promise((res) => { resolveOld = res; });
  const sandbox = {
    document,
    fetch: async (url) => {
      if (String(url).includes('perimeter')) {
        perimeterCallCount++;
        if (perimeterCallCount === 1) {
          // First (stale) call: returns a promise that rejects when resolved
          return oldPromise.then(() => { throw new Error('Old rejected'); });
        }
        // Second (fresh) call: immediate success
        return {
          json: async () => ({
            success: true,
            summary: { events: 10, uniqueIPs: 2, denied: 0, error: 0 },
            topIPs: [{ ip: '1.2.3.4', count: 5, denied: 0, error: 0, hosts: ['a.example'] }],
            byHost: [{ host: 'a.example', count: 5, denied: 0, error: 0 }],
          }),
        };
      }
      return {
        json: async () => ({
          success: true,
          insights: [{ severity: 'ok', title: 'All quiet', plain: 'nothing' }],
          summary: { totalRequests: 5, uniqueIPs: 1, securityEvents: 0, failedActions: 0 },
          topIPs: [{ ip: '127.0.0.1', count: 5, failures: 0, topActions: [['auth.login', 5]], lastSeen: '2026-01-01T00:00:00Z' }],
          storage: { auditLog: { sizeMB: 1, entries: 10 } },
        }),
      };
    },
    prompt: () => null,
    alert: () => {},
    confirm: () => false,
    console,
    setTimeout,
  };
  vm.createContext(sandbox);
  vm.runInContext(fs.readFileSync(findTarget(), 'utf8'), sandbox, { filename: 'log-insights.js' });

  document.getElementById('log-insights-btn').click();
  await new Promise((r) => setTimeout(r, 20));

  // Simulate a rapid period change — fires a NEW request before old resolves.
  const periodSel = document.getElementById('li-period');
  periodSel.value = '6';
  const listeners = periodSel.listeners || {};
  if (listeners.change) await listeners.change();
  await new Promise((r) => setTimeout(r, 20));

  // Now resolve the OLD request's rejection.
  resolveOld(undefined);
  await new Promise((r) => setTimeout(r, 20));

  const perimeter = document.getElementById('li-perimeter').innerHTML;
  assert.ok(perimeter.includes('1.2.3.4') || perimeter.includes('10 requests') || perimeter.includes('requests from'),
    'stale rejection overwrote fresh perimeter: ' + perimeter);
});