#!/usr/bin/env node
/* Validate the machine-readable playable report and, when requested, seal it
 * with the parent process' exit/log gate. The client cannot mark a run PASS by
 * itself: the final report is written only after the child has exited. */
import fs from 'node:fs';
import path from 'node:path';

const VALID = new Set(['PASS', 'FAIL', 'BLOCKED', 'SKIP']);
const ERROR_RE = /SCRIPT ERROR|Parse Error|^ERROR:|leaked at exit|shaders of type .* were never freed/m;

function usage() {
  console.error('usage: validate_playable_report.mjs --report PATH [--output PATH] [--log PATH] [--process-code N] [--run-id ID] [--require-pass]');
}

function argsOf(argv) {
  const out = { require_pass: false };
  for (let i = 0; i < argv.length; i += 1) {
    const arg = argv[i];
    if (arg === '--require-pass') out.require_pass = true;
    else if (arg.startsWith('--')) {
      const key = arg.slice(2).replaceAll('-', '_');
      if (i + 1 >= argv.length) throw new Error(`missing value for ${arg}`);
      out[key] = argv[++i];
    } else throw new Error(`unknown argument: ${arg}`);
  }
  if (!out.report) throw new Error('--report is required');
  return out;
}

function readJson(file) {
  try { return JSON.parse(fs.readFileSync(file, 'utf8')); }
  catch (error) { return { __read_error: `${file}: ${error.message}` }; }
}

function validate(report, options) {
  const errors = [];
  const readError = report?.__read_error;
  if (readError) errors.push(readError);
  if (!report || typeof report !== 'object' || Array.isArray(report)) {
    errors.push('report root must be an object');
    return errors;
  }
  if (report.schema_version !== 1) errors.push('schema_version must be 1');
  if (typeof report.run_id !== 'string' || report.run_id.trim() === '') errors.push('run_id is missing');
  if (options.run_id && report.run_id !== options.run_id) errors.push('run_id does not match requested run');
  if (report.suite !== 'playable') errors.push('suite must be playable');
  if (!VALID.has(report.status)) errors.push(`invalid report status: ${report.status}`);
  for (const key of ['engine_sha256', 'extension_sha256', 'pck_sha256', 'arch']) {
    if (typeof report.build?.[key] !== 'string' || report.build[key].trim() === '') errors.push(`build.${key} is missing`);
  }
  if (!Array.isArray(report.cases) || report.cases.length === 0) errors.push('cases must be non-empty');
  const cases = Array.isArray(report.cases) ? report.cases : [];
  let passed = 0;
  for (const item of cases) {
    if (!item || typeof item !== 'object' || typeof item.id !== 'string' || item.id.trim() === '') {
      errors.push('case id is missing');
      continue;
    }
    if (!VALID.has(item.status)) errors.push(`${item.id}: invalid status`);
    if (item.status === 'PASS') passed += 1;
    if (item.status === 'BLOCKED' || item.status === 'SKIP') errors.push(`${item.id}: ${item.status} is not releasable`);
    if (!Array.isArray(item.evidence)) errors.push(`${item.id}: evidence must be an array`);
    for (const evidence of (Array.isArray(item.evidence) ? item.evidence : [])) {
      if (typeof evidence !== 'string' || evidence.trim() === '') errors.push(`${item.id}: empty evidence path`);
      else if (!fs.existsSync(path.resolve(path.dirname(options.report), evidence))) errors.push(`${item.id}: missing evidence ${evidence}`);
    }
  }
  const coverage = report.coverage;
  if (!coverage || coverage.required !== cases.length || coverage.passed !== passed) errors.push('coverage does not match cases');
  if (!Array.isArray(report.failures) || !Array.isArray(report.blocked)) errors.push('failures and blocked must be arrays');
  if (!report.exit_gate || report.exit_gate.checked !== true) errors.push('exit_gate.checked must be true in final report');
  if (options.process_code !== undefined && Number(report.exit_gate?.process_code) !== Number(options.process_code)) errors.push('exit_gate.process_code does not match child process');
  if (Number(report.exit_gate?.process_code) !== 0) errors.push('child process did not exit with code 0');
  if (options.log) {
    if (!fs.existsSync(options.log)) errors.push(`log does not exist: ${options.log}`);
    else {
      const lines = fs.readFileSync(options.log, 'utf8').split(/\r?\n/);
      lines.forEach((line, index) => { if (ERROR_RE.test(line)) errors.push(`log:${index + 1}: ${line}`); });
    }
  }
  if (options.require_pass && report.status !== 'PASS') errors.push(`report status is ${report.status}, expected PASS`);
  if (report.status === 'FAIL') errors.push('client report already contains failures');
  return [...new Set(errors)];
}

function main() {
  let options;
  try { options = argsOf(process.argv.slice(2)); }
  catch (error) { usage(); console.error(error.message); return 2; }
  const input = readJson(options.report);
  const report = input.__read_error ? {
    schema_version: 1, run_id: options.run_id || 'missing-report', suite: 'playable', status: 'FAIL',
    build: { engine_sha256: '', extension_sha256: '', pck_sha256: '', arch: '' }, cases: [],
    failures: [input.__read_error], blocked: [], coverage: { required: 0, passed: 0 },
  } : input;
  const exitCode = options.process_code === undefined ? null : Number(options.process_code);
  report.exit_gate = { checked: true, process_code: exitCode, errors: [] };
  const errors = validate(report, options);
  report.exit_gate.errors = errors;
  if (errors.length > 0) report.status = 'FAIL';
  const output = options.output || options.report;
  fs.mkdirSync(path.dirname(path.resolve(output)), { recursive: true });
  fs.writeFileSync(output, `${JSON.stringify(report, null, 2)}\n`);
  if (errors.length) {
    console.error(`PLAYABLE REPORT: FAIL (${errors.length} errors)`);
    errors.forEach((error) => console.error(`- ${error}`));
    return 1;
  }
  console.log(`PLAYABLE REPORT: PASS ${output}`);
  return 0;
}

process.exitCode = main();