import { describe, it } from 'node:test';
import assert from 'node:assert/strict';
import { resolve, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';
import { execFile } from 'node:child_process';
import { promisify } from 'node:util';
import { readFile, unlink } from 'node:fs/promises';

const exec = promisify(execFile);
const __dirname = dirname(fileURLToPath(import.meta.url));
const REPO = resolve(__dirname, '../..');
const CLI = resolve(REPO, 'scanners/posture.mjs');
const FIXTURE = resolve(REPO, 'tests/fixtures/marketplace-medium');
const POSTURE_JSON_SNAPSHOT = resolve(REPO, 'tests/snapshots/v5.0.0/posture.json');
const POSTURE_STDERR_SNAPSHOT = resolve(REPO, 'tests/snapshots/v5.0.0-stderr/posture.txt');

/**
 * Normalize a runPosture result for snapshot comparison by zeroing out
 * time-varying fields, machine-specific paths, and ancestor-cascade-derived
 * counts. `claudeMdEstimatedTokens` reflects walkClaudeMdCascade walking
 * upward from the fixture; any docs edit to this plugin's own CLAUDE.md
 * ripples into it even though scanner behavior is unchanged.
 */
function normalizePosture(p) {
  const out = JSON.parse(JSON.stringify(p));
  if (out.scannerEnvelope) {
    if (out.scannerEnvelope.meta) {
      out.scannerEnvelope.meta.target = '<TARGET>';
      out.scannerEnvelope.meta.timestamp = '<TIMESTAMP>';
    }
    if (Array.isArray(out.scannerEnvelope.scanners)) {
      for (const s of out.scannerEnvelope.scanners) {
        s.duration_ms = 0;
        if (s.activeConfig && 'claudeMdEstimatedTokens' in s.activeConfig) {
          s.activeConfig.claudeMdEstimatedTokens = '<ANCESTOR_DERIVED>';
        }
      }
    }
  }
  return out;
}

/** Strip time-varying durations (Xms) so progress lines compare verbatim across runs. */
function normalizeStderr(s) {
  return s.replace(/\(\d+ms\)/g, '(0ms)');
}

async function runPosture(flags) {
  const proc = await exec('node', [CLI, FIXTURE, ...flags], {
    timeout: 60000,
    cwd: REPO,
  }).catch(err => err); // posture exits non-zero on findings — capture either way
  return {
    stdout: proc.stdout || '',
    stderr: proc.stderr || '',
  };
}

describe('posture humanizer wiring (Step 6)', () => {
  describe('--json mode (SC-6: byte-equal stdout)', () => {
    it('stdout JSON deepEquals v5.0.0 snapshot', async () => {
      const { stdout } = await runPosture(['--json']);
      const actual = JSON.parse(stdout);
      const expected = JSON.parse(await readFile(POSTURE_JSON_SNAPSHOT, 'utf-8'));
      assert.deepStrictEqual(normalizePosture(actual), normalizePosture(expected));
    });

    it('does NOT write a scorecard to stderr (suppressed)', async () => {
      const { stderr } = await runPosture(['--json']);
      assert.ok(!stderr.includes('Config-Audit Health Score'),
        'stderr must NOT contain scorecard in --json mode');
      assert.ok(!stderr.includes('Configuration health'),
        'stderr must NOT contain humanized scorecard in --json mode');
    });

    it('preserves v5.0.0 finding shape (no humanizer fields in scannerEnvelope)', async () => {
      const { stdout } = await runPosture(['--json']);
      const actual = JSON.parse(stdout);
      for (const s of actual.scannerEnvelope.scanners) {
        for (const f of s.findings) {
          assert.equal(f.userImpactCategory, undefined,
            `${f.id}: --json findings must not have userImpactCategory`);
        }
      }
    });
  });

  describe('--raw mode (SC-7: byte-equal stdout + verbatim stderr)', () => {
    it('stdout JSON deepEquals v5.0.0 snapshot', async () => {
      const { stdout } = await runPosture(['--raw']);
      const actual = JSON.parse(stdout);
      const expected = JSON.parse(await readFile(POSTURE_JSON_SNAPSHOT, 'utf-8'));
      assert.deepStrictEqual(normalizePosture(actual), normalizePosture(expected));
    });

    it('stderr scorecard verbatim matches v5.0.0 stderr snapshot', async () => {
      const { stderr } = await runPosture(['--raw']);
      const expected = await readFile(POSTURE_STDERR_SNAPSHOT, 'utf-8');
      // Compare the scorecard portion verbatim (modulo timing in scanner progress lines)
      assert.equal(normalizeStderr(stderr).trim(), normalizeStderr(expected).trim());
    });

    it('preserves v5.0.0 finding shape in stdout', async () => {
      const { stdout } = await runPosture(['--raw']);
      const actual = JSON.parse(stdout);
      for (const s of actual.scannerEnvelope.scanners) {
        for (const f of s.findings) {
          assert.equal(f.userImpactCategory, undefined,
            `${f.id}: --raw findings must not have userImpactCategory`);
        }
      }
    });
  });

  describe('default mode (humanized scorecard)', () => {
    it('writes humanized scorecard to stderr', async () => {
      const { stderr } = await runPosture([]);
      // Humanized scorecard must contain at least one user-friendly cue not in raw v5.0.0
      const hasGradeContext = /healthy|good shape|attention|polish|setup/i.test(stderr);
      assert.ok(hasGradeContext,
        `humanized stderr scorecard must contain user-friendly phrasing, got:\n${stderr}`);
    });

    it('does NOT write JSON to stdout in default mode', async () => {
      const { stdout } = await runPosture([]);
      assert.equal(stdout.trim(), '', 'default mode must not write JSON to stdout');
    });

    it('humanized scorecard differs byte-wise from v5.0.0 stderr', async () => {
      const { stderr } = await runPosture([]);
      const expected = await readFile(POSTURE_STDERR_SNAPSHOT, 'utf-8');
      assert.notEqual(normalizeStderr(stderr).trim(), normalizeStderr(expected).trim(),
        'humanized stderr must differ from v5.0.0 verbatim stderr');
    });
  });
});