import assert from 'node:assert/strict';
import {copyFileSync, mkdirSync, mkdtempSync, readFileSync, writeFileSync} from 'node:fs';
import {spawnSync} from 'node:child_process';
import {createHash} from 'node:crypto';
import {join, relative, resolve} from 'node:path';

assert.equal(process.argv.length, 3,
  'usage: node pci-bridges-local.mjs <K1435-matrix-check-report.json>');
const root = process.cwd();
const predecessorPath = resolve(process.argv[2]);
const predecessor = JSON.parse(readFileSync(predecessorPath, 'utf8'));
assert.equal(predecessor.status, 'K1435_PCI_CAPABILITIES_DEVELOPMENT_MATRIX_VALIDATED');
const dir = mkdtempSync(join(root, 'reports/os-implementation/K1440-pci-bridges-local-'));
const sha = path => createHash('sha256').update(readFileSync(path)).digest('hex');
const artifact = path => ({path: relative(root, path), sha256: sha(path)});
const copy = (source, target) => {
  mkdirSync(join(target, '..'), {recursive: true});
  copyFileSync(join(root, source), target);
  return artifact(target);
};
const sourceRoot = join(dir, 'source');
const model = join(sourceRoot, 'os-pci-discovery/src/bridges.rs');
const fixture = join(sourceRoot, 'kernel/tests/os/pci_bridges.rs');
const noStdRoot = join(sourceRoot, 'no-std-root.rs');
mkdirSync(sourceRoot, {recursive: true});
writeFileSync(noStdRoot, '#![no_std]\n#[path = "os-pci-discovery/src/bridges.rs"]\npub mod pci_bridges;\n');
const sources = {
  model: copy('os-pci-discovery/src/bridges.rs', model),
  fixture: copy('kernel/tests/os/pci_bridges.rs', fixture),
  contract: copy('kernel/PCI_BRIDGE_CONTRACT.md',
    join(sourceRoot, 'kernel/PCI_BRIDGE_CONTRACT.md')),
  noStdRoot: artifact(noStdRoot),
  dtbReference: copy('kernel/src/dtb.rs', join(sourceRoot, 'kernel/src/dtb.rs')),
  harness: artifact(join(root, 'scripts/os-acceptance/pci-bridges-local.mjs')),
};
const run = (name, program, args, expected) => {
  const result = spawnSync(program, args, {cwd: root, encoding: 'utf8'});
  const log = join(dir, `${name}.log`);
  writeFileSync(log, `${result.stdout ?? ''}${result.stderr ?? ''}`);
  assert.equal(result.status, expected,
    `${name}: expected exit ${expected}, observed ${result.status}; ${artifact(log).path}`);
  return {exitCode: result.status, log: artifact(log)};
};
const binary = join(dir, 'pci-bridges-tests');
const tests = {
  compile: run('host-compile', 'rustc', ['--edition=2024', '--test', fixture, '-o', binary], 0),
  green: run('host-tests', binary, [], 0),
  target: run('aarch64-no-std-check', 'rustc', ['--edition=2024', '--crate-type=lib',
    '--target=aarch64-unknown-none', '--emit=metadata', noStdRoot,
    '-o', join(dir, 'model.rmeta')], 0),
};
const greenText = readFileSync(join(dir, 'host-tests.log'), 'utf8');
assert.match(greenText, /os_pci_discovery_bridges_positive \.\.\. ok/);
assert.match(greenText, /os_pci_discovery_bridges_negative \.\.\. ok/);
assert.match(greenText, /2 passed; 0 failed/);

const mutantRoot = join(dir, 'mutant');
const mutantModel = join(mutantRoot, 'os-pci-discovery/src/bridges.rs');
const mutantFixture = join(mutantRoot, 'kernel/tests/os/pci_bridges.rs');
copy('kernel/tests/os/pci_bridges.rs', mutantFixture);
mkdirSync(join(mutantModel, '..'), {recursive: true});
const original = readFileSync(model, 'utf8');
const guard = 'if secondary == upstream.secondary {\n                return Err(Error::SecondaryCollision);\n            }';
assert.equal(original.split(guard).length, 2, 'parent-secondary guard must exist once');
writeFileSync(mutantModel, original.replace(guard, 'if false {\n                return Err(Error::SecondaryCollision);\n            }'));
const mutant = artifact(mutantModel);
const mutantBinary = join(dir, 'pci-bridges-mutant-tests');
tests.mutantCompile = run('mutant-compile', 'rustc',
  ['--edition=2024', '--test', mutantFixture, '-o', mutantBinary], 0);
tests.red = run('mutant-tests', mutantBinary, [], 101);
const redText = readFileSync(join(dir, 'mutant-tests.log'), 'utf8');
assert.match(redText, /os_pci_discovery_bridges_negative \.\.\. FAILED/);

const report = {
  schema: 'turkos-k1440-pci-bridges-local/v1',
  status: 'K1436_K1439_LOCAL_VALIDATED',
  guestAccepted: false, productAccepted: false,
  predecessor: artifact(predecessorPath), sources, mutant,
  tests: {...tests, greenCount: 2, mutationRejected: true},
  scope: 'A bounded bus tree accepts one root bridge and one nested bridge, assigns buses 1 and 2 to unique owners, and rejects a child secondary bus that collides with its parent without changing the prior tree. Two host tests and AArch64 no_std compilation passed; removing the collision guard made the negative test fail. This does not prove physical bridge enumeration.',
};
const reportPath = join(dir, 'report.json');
writeFileSync(reportPath, JSON.stringify(report, null, 2) + '\n');
console.log(JSON.stringify({status: report.status, report: relative(root, reportPath),
  tests: report.tests.greenCount, mutationRejected: report.tests.mutationRejected}));