import { execFileSync } from 'node:child_process';
import fs from 'node:fs';
import path from 'node:path';

const tasks = [
  ['TASK-WP5-03', 'origin/codex/wp5-03'],
  ['TASK-WP5-04', 'origin/codex/wp5-04'],
  ['TASK-WP5-05', 'origin/codex/wp5-05'],
  ['TASK-WP5-06', 'origin/codex/wp5-06'],
  ['TASK-WP5-07', 'origin/codex/wp5-07'],
];

function sha(ref) {
  return execFileSync('git', ['rev-parse', ref], { encoding: 'utf8' }).trim();
}

function isAncestor(ref) {
  try {
    execFileSync('git', ['merge-base', '--is-ancestor', ref, 'HEAD'], { stdio: 'ignore' });
    return true;
  } catch {
    return false;
  }
}

function run(command, args) {
  try {
    const executable = process.platform === 'win32' && command === 'pnpm' ? 'pnpm.cmd' : command;
    execFileSync(executable, args, { stdio: 'pipe', encoding: 'utf8', shell: process.platform === 'win32' });
    return { status: 'passed' };
  } catch (error) {
    return { status: 'failed', exit_code: error.status ?? 1 };
  }
}

const checks = tasks.map(([task, ref]) => ({ task, ref, sha: sha(ref), ancestor: isAncestor(ref) }));
const regression = {
  'TASK-WP5-06': run('pnpm', ['exec', 'vitest', 'run', 'tests/integration/wp5-06-sticker-cleanup.test.ts']),
  'TASK-WP5-07': run('pnpm', ['exec', 'vitest', 'run', 'tests/api/wp5-07-preview-grants.test.ts']),
};
const status = checks.every((check) => check.ancestor)
  && Object.values(regression).every((check) => check.status === 'passed')
  ? 'ready_for_wp4_07'
  : 'externally_blocked';

const output = {
  schema_version: '1.0',
  task: 'TASK-WP5-LINEAGE',
  status,
  checks,
  regression,
  note: 'This gate proves ancestry and targeted regressions only; it does not replace per-task UI/resource evidence.',
};
const runId = `wp5-lineage-${new Date().toISOString().replace(/[^0-9]/g, '')}`;
const outputDirectory = path.join('artifacts', 'tdd', runId);
fs.mkdirSync(outputDirectory, { recursive: true });
fs.writeFileSync(path.join(outputDirectory, 'lineage.json'), `${JSON.stringify(output, null, 2)}\n`, 'utf8');
console.log(JSON.stringify(output));
process.exitCode = status === 'ready_for_wp4_07' ? 0 : 3;