import { describe, it, beforeEach, before, after } from 'node:test';
import assert from 'node:assert/strict';
import { resolve, join, sep } from 'node:path';
import { fileURLToPath } from 'node:url';
import { mkdir, writeFile, rm } from 'node:fs/promises';
import { tmpdir } from 'node:os';
import { resetCounter } from '../../scanners/lib/output.mjs';
import { discoverConfigFiles } from '../../scanners/lib/file-discovery.mjs';
import { scan } from '../../scanners/conflict-detector.mjs';

const __dirname = fileURLToPath(new URL('.', import.meta.url));
const FIXTURES = resolve(__dirname, '../fixtures');

describe('CNF scanner — conflict project', () => {
  let result;
  beforeEach(async () => {
    resetCounter();
    const discovery = await discoverConfigFiles(resolve(FIXTURES, 'conflict-project'));
    result = await scan(resolve(FIXTURES, 'conflict-project'), discovery);
  });

  it('returns status ok', () => {
    assert.equal(result.status, 'ok');
  });

  it('reports scanner prefix CNF', () => {
    assert.equal(result.scanner, 'CNF');
  });

  it('finding IDs match CA-CNF-NNN pattern', () => {
    for (const f of result.findings) {
      assert.match(f.id, /^CA-CNF-\d{3}$/);
    }
  });

  it('detects model key conflict', () => {
    assert.ok(result.findings.some(f => f.title.includes('model')));
  });

  it('settings conflict is medium severity', () => {
    const model = result.findings.find(f => f.title.includes('model'));
    assert.equal(model.severity, 'medium');
  });

  it('detects effortLevel key conflict', () => {
    assert.ok(result.findings.some(f => f.title.includes('effortLevel')));
  });

  it('detects permission allow/deny conflict', () => {
    assert.ok(result.findings.some(f => f.title.includes('Permission allow/deny')));
  });

  it('permission conflict is high severity', () => {
    const perm = result.findings.find(f => f.title.includes('Permission allow/deny'));
    assert.equal(perm.severity, 'high');
  });

  it('detects duplicate hook definition', () => {
    assert.ok(result.findings.some(f => f.title.includes('Duplicate hook')));
  });

  it('duplicate hook is low severity', () => {
    const hook = result.findings.find(f => f.title.includes('Duplicate hook'));
    assert.equal(hook.severity, 'low');
  });

  it('has exactly 4 findings', () => {
    assert.equal(result.findings.length, 4);
  });

  it('includes evidence with scope info', () => {
    const perm = result.findings.find(f => f.title.includes('Permission'));
    assert.ok(perm.evidence);
  });
});

describe('CNF scanner — healthy project', () => {
  let result;
  beforeEach(async () => {
    resetCounter();
    const discovery = await discoverConfigFiles(resolve(FIXTURES, 'healthy-project'));
    result = await scan(resolve(FIXTURES, 'healthy-project'), discovery);
  });

  it('returns ok with no conflicts', () => {
    assert.equal(result.status, 'ok');
  });

  it('has 0 findings', () => {
    assert.equal(result.findings.length, 0);
  });
});

describe('CNF scanner — empty project', () => {
  let result;
  beforeEach(async () => {
    resetCounter();
    const discovery = await discoverConfigFiles(resolve(FIXTURES, 'empty-project'));
    result = await scan(resolve(FIXTURES, 'empty-project'), discovery);
  });

  it('returns skipped when no config files', () => {
    assert.equal(result.status, 'skipped');
  });

  it('has 0 findings', () => {
    assert.equal(result.findings.length, 0);
  });
});

describe('CNF scanner — minimal project', () => {
  let result;
  beforeEach(async () => {
    resetCounter();
    const discovery = await discoverConfigFiles(resolve(FIXTURES, 'minimal-project'));
    result = await scan(resolve(FIXTURES, 'minimal-project'), discovery);
  });

  it('returns skipped with no settings files', () => {
    assert.equal(result.status, 'skipped');
  });

  it('has 0 findings', () => {
    assert.equal(result.findings.length, 0);
  });
});

describe('CNF scanner — param-qualified cross-scope conflicts', () => {
  // project allow: WebFetch(domain:good.com), Agent(model:sonnet)
  // local   deny:  WebFetch(domain:*),        Agent(model:opus)
  // WebFetch: deny domain:* covers allow domain:good.com → genuine conflict.
  // Agent:    deny model:opus vs allow model:sonnet → disjoint → NO conflict.
  let result;
  beforeEach(async () => {
    resetCounter();
    const discovery = await discoverConfigFiles(resolve(FIXTURES, 'param-conflict-project'));
    result = await scan(resolve(FIXTURES, 'param-conflict-project'), discovery);
  });

  it('detects the WebFetch wildcard-domain conflict (currently a false negative)', () => {
    const perm = result.findings.filter(f => f.title.includes('Permission allow/deny'));
    assert.ok(
      perm.some(f => /WebFetch/.test(`${f.description} ${f.evidence}`)),
      `expected a WebFetch allow/deny conflict; got: ${perm.map(f => f.evidence).join(' | ') || '(none)'}`,
    );
  });

  it('does NOT flag Agent(model:sonnet) vs Agent(model:opus) as a conflict', () => {
    const perm = result.findings.filter(f => f.title.includes('Permission allow/deny'));
    assert.ok(
      !perm.some(f => /Agent/.test(`${f.description} ${f.evidence}`)),
      'distinct model params must not conflict',
    );
  });

  it('reports exactly one permission conflict', () => {
    const perm = result.findings.filter(f => f.title.includes('Permission allow/deny'));
    assert.equal(perm.length, 1);
  });
});

// B3 soft-spot proof: stale ~/.claude/plugins/cache versions ship hooks.json
// that the SAME plugin also ships in its active version. CNF groups hooks by
// event:matcher across sources, so multiple cached versions inflate the
// "Duplicate hook" count. Excluding stale cache must measurably DROP CNF
// findings. This verifies the mechanism rather than assuming it.
describe('CNF scanner — cache exclusion drops duplicate-hook count (B3)', () => {
  let dir, includeCount, excludeCount;

  before(async () => {
    dir = join(tmpdir(), `config-audit-cnf-cache-${Date.now()}`);
    const pluginsDir = join(dir, 'plugins');
    const versions = ['mkt/voyage/5.6.0', 'mkt/voyage/5.1.1', 'mkt/voyage/5.0.0'];
    for (const key of versions) {
      const verDir = join(pluginsDir, 'cache', ...key.split('/'), 'hooks');
      await mkdir(verDir, { recursive: true });
      await writeFile(join(verDir, 'hooks.json'),
        JSON.stringify({ hooks: { PreToolUse: [{ matcher: 'Edit' }] } }));
    }
    // Only 5.6.0 is active; 5.1.1 + 5.0.0 are stale.
    await writeFile(join(pluginsDir, 'installed_plugins.json'), JSON.stringify({
      version: 2,
      plugins: {
        'voyage@mkt': [{ scope: 'user', version: '5.6.0',
          installPath: join(pluginsDir, 'cache', 'mkt', 'voyage', '5.6.0') }],
      },
    }));

    resetCounter();
    const dIncl = await discoverConfigFiles(dir);
    includeCount = (await scan(dir, dIncl)).findings.filter(f => f.title.includes('Duplicate hook')).length;

    resetCounter();
    const dExcl = await discoverConfigFiles(dir, { excludeCache: true });
    excludeCount = (await scan(dir, dExcl)).findings.filter(f => f.title.includes('Duplicate hook')).length;
  });

  after(async () => {
    await rm(dir, { recursive: true, force: true });
  });

  it('full walk surfaces ≥1 duplicate-hook finding from cached versions', () => {
    assert.ok(includeCount >= 1, `expected duplicate hooks with cache, got ${includeCount}`);
  });

  it('excluding cache measurably drops the duplicate-hook count', () => {
    assert.ok(excludeCount < includeCount,
      `cache exclusion must drop CNF count: include=${includeCount} exclude=${excludeCount}`);
  });
});

// M-BUG-2: CNF must segregate plugin-bundled configs from the user's authored
// cascade. Installed plugins ship their OWN settings.json / hooks.json — plus
// bundled test fixtures and examples — under ~/.claude/plugins/. None of these
// are user-authored config the user can edit, and a "conflict" between two
// plugins' bundled files is not something the user can resolve. Yet CNF compared
// every settings-json/hooks-json pairwise regardless of origin, inflating the
// Conflicts grade to F with hundreds of bogus findings (339 on this machine,
// ~315 of them high-severity permission "conflicts" between plugin test
// fixtures). CNF must exclude any file whose path is under `.claude/plugins/`.
// The exclusion belongs in CNF, NOT discovery: an active plugin's contributed
// hooks.json/.mcp.json legitimately lives in plugins/cache and other scanners
// need it — only conflict analysis must ignore it.
describe('CNF scanner — excludes plugin-bundled configs (M-BUG-2)', () => {
  let dir, result, discovery;

  before(async () => {
    dir = join(tmpdir(), `config-audit-cnf-mbug2-${Date.now()}`);
    // Live, user-authored cascade (project-scope settings).
    const liveClaude = join(dir, '.claude');
    await mkdir(liveClaude, { recursive: true });
    await writeFile(join(liveClaude, 'settings.json'), JSON.stringify({
      model: 'opus',
      permissions: { deny: ['Bash(curl:*)'] },
      hooks: { PreToolUse: [{ matcher: 'Edit' }] },
    }));
    // An installed plugin ships its OWN settings.json + hooks.json (active version).
    const p1 = join(liveClaude, 'plugins', 'cache', 'mkt', 'p1', '1.0.0');
    await mkdir(join(p1, '.claude'), { recursive: true });
    await writeFile(join(p1, '.claude', 'settings.json'), JSON.stringify({
      model: 'sonnet',
      permissions: { allow: ['Bash(curl:*)'] },
      hooks: { PreToolUse: [{ matcher: 'Edit' }] },
    }));
    await mkdir(join(p1, 'hooks'), { recursive: true });
    await writeFile(join(p1, 'hooks', 'hooks.json'), JSON.stringify({
      hooks: { PreToolUse: [{ matcher: 'Edit' }] },
    }));
    // Another plugin ships a TEST FIXTURE settings.json — pure noise, never live.
    const p2fix = join(liveClaude, 'plugins', 'cache', 'mkt', 'p2', '2.0.0',
      'tests', 'fixtures', 'proj', '.claude');
    await mkdir(p2fix, { recursive: true });
    await writeFile(join(p2fix, 'settings.json'), JSON.stringify({
      model: 'haiku',
      permissions: { allow: ['Bash(rm:*)'] },
    }));

    resetCounter();
    discovery = await discoverConfigFiles(dir);
    result = await scan(dir, discovery);
  });

  after(async () => {
    await rm(dir, { recursive: true, force: true });
  });

  it('discovery surfaces the plugin-bundled settings (exclusion must be CNF-side, not discovery-side)', () => {
    const pluginSettings = discovery.files.filter(
      f => f.type === 'settings-json' && f.absPath.includes(`.claude${sep}plugins${sep}`));
    assert.ok(pluginSettings.length >= 2,
      `expected ≥2 plugin-bundled settings discovered; got ${pluginSettings.length}`);
  });

  it('does not flag any conflict sourced from plugin-bundled configs', () => {
    assert.equal(result.findings.length, 0,
      `expected 0 CNF findings (only noise is plugin-bundled); got ${result.findings.length}: ${result.findings.map(f => f.title).join(', ')}`);
  });
});

// Guard against over-exclusion: the fix must NOT silence genuine conflicts
// between the user's own authored files (user/project/local), which are not
// under `.claude/plugins/`.
describe('CNF scanner — genuine live conflict still flagged (M-BUG-2 guard)', () => {
  let dir, result;

  before(async () => {
    dir = join(tmpdir(), `config-audit-cnf-mbug2-guard-${Date.now()}`);
    const claude = join(dir, '.claude');
    await mkdir(claude, { recursive: true });
    await writeFile(join(claude, 'settings.json'), JSON.stringify({ model: 'opus' }));
    await writeFile(join(claude, 'settings.local.json'), JSON.stringify({ model: 'haiku' }));
    resetCounter();
    const discovery = await discoverConfigFiles(dir);
    result = await scan(dir, discovery);
  });

  after(async () => {
    await rm(dir, { recursive: true, force: true });
  });

  it('still flags the genuine cross-scope key conflict between user-authored files', () => {
    assert.ok(result.findings.some(f => f.title.includes('model')),
      `expected a genuine "model" conflict; got: ${result.findings.map(f => f.title).join(', ') || '(none)'}`);
  });
});