#!/usr/bin/env node
import path from 'node:path';
import { fileURLToPath } from 'node:url';
import { dateRange, readCommits, readIssues, readSessions, summarize, formatTable, SourceError } from './ledger.mjs';

const usage = 'Usage: node packages/ledger/src/cli.mjs --since YYYY-MM-DD [--until YYYY-MM-DD] [--json] [--no-issues]';
export async function main(args, root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '../../..')) {
  let since, until, json = false, noIssues = false;
  const seen = new Set();
  for (let i = 0; i < args.length; i++) {
    const flag = args[i];
    if (seen.has(flag)) throw new SourceError(`Duplicate option: ${flag}`);
    seen.add(flag);
    if (flag === '--help') { console.log(usage); return; }
    if (flag === '--json') json = true;
    else if (flag === '--no-issues') noIssues = true;
    else if (flag === '--since' || flag === '--until') {
      const value = args[++i];
      if (!value || value.startsWith('--')) throw new SourceError(`${flag} requires a date`);
      if (flag === '--since') since = value; else until = value;
    } else throw new SourceError('Unknown option; ' + usage);
  }
  if (!since) throw new SourceError(usage);
  const range = dateRange(since, until);
  const commits = readCommits(root, range);
  // Fixture tools may be placed first on PATH. The repository client is the
  // default without requiring installation or reading auth material here.
  const priorPath = process.env.PATH;
  process.env.PATH = `${priorPath ?? ''}${path.delimiter}${path.join(root, 'scripts')}`;
  let issues;
  try { issues = noIssues ? null : readIssues(root, range); }
  finally { if (priorPath === undefined) delete process.env.PATH; else process.env.PATH = priorPath; }
  const sessions = await readSessions(root, range);
  const report = summarize(range, commits, issues, sessions);
  console.log(json ? JSON.stringify(report, null, 2) : formatTable(report));
  return report;
}
if (process.argv[1] && path.resolve(process.argv[1]) === fileURLToPath(import.meta.url)) {
  main(process.argv.slice(2)).catch(error => {
    console.error(error instanceof SourceError ? error.message : 'Ledger failed: cannot read source evidence');
    process.exitCode = error.exitCode ?? 1;
  });
}