#!/usr/bin/env -S bun --no-env-file --config=/dev/null
/**
 * gstack-factory-scorecard — one window of a repository's shipping numbers,
 * read from GitHub through gh: merged PRs (crew vs outside), lead time (created
 * to merged, READY to merged), gate runs with known cost, red-train rate, flaky
 * events, issues opened vs closed, releases cut. Markdown table on stdout plus
 * a CSV; /retro Step 7.5 runs it; docs/recommended-harness.md explains each
 * line and where gstack's own numbers stand. Read-only: no write, no paid work.
 *
 * Usage:
 *   gstack-factory-scorecard [--repo owner/name] [--base main] [--since-days 7]
 *       [--crew login,login] [--gate-workflow evals.yml] [--gate-event workflow_dispatch|any]
 *       [--free-workflow free-tests.yml] [--train-prefix train/] [--ready-marker <regex>]
 *       [--pass-marker <regex>] [--pass-cap 3] [--max-artifact-runs 60]
 *       [--out-dir <dir>] [--csv <file>] [--json] [--cache-dir <dir>]
 *       [--fixtures <recorded gh responses.json>] [--now <iso>]
 *
 * The window is [now - since-days, now): --now (default: the current time) is
 * its end, and every line counts only items inside it.
 * --repo defaults to the GitHub owner/name of the origin remote; without one,
 * pass it. Every run writes this window's scorecard.{csv,md} and appends its
 * rows to trend.csv in --out-dir, so the weeks line up.
 * Exit 0 with the table even when an input is unavailable (the line says so);
 * exit 2 on bad usage. Needs gh with read access to the repository unless
 * --fixtures replays recorded responses.
 */
import { spawnSync } from 'node:child_process';
import * as fs from 'node:fs';
import * as os from 'node:os';
import * as path from 'node:path';
import {
  DEFAULTS, collectScorecard, fixtureSource, ghSource, renderCsv, renderMarkdown, scorecardRows, type FixtureFile, type ScorecardOptions,
} from '../lib/factory-scorecard';

function usage(code: number): never {
  const lines = fs.readFileSync(new URL(import.meta.url), 'utf8').split('\n');
  const text = lines.slice(2, lines.indexOf(' */')).map(l => l.replace(/^ ?\* ?/, '')).join('\n');
  (code ? console.error : console.log)(text);
  process.exit(code);
}

const args = process.argv.slice(2);
const flags = new Map<string, string>();
let json = false;
for (let i = 0; i < args.length; i++) {
  const a = args[i]!;
  if (a === '--help' || a === '-h') usage(0);
  if (a === '--json') { json = true; continue; }
  if (!a.startsWith('--') || i + 1 >= args.length) { console.error(`unexpected argument: ${a}`); usage(2); }
  flags.set(a.slice(2), args[++i]!);
}

const sinceDays = Number(flags.get('since-days') ?? DEFAULTS.sinceDays);
if (!Number.isFinite(sinceDays) || sinceDays <= 0) { console.error('--since-days must be a positive number'); usage(2); }
const now = flags.has('now') ? Date.parse(flags.get('now')!) : Date.now();
if (!Number.isFinite(now)) { console.error('--now must be an ISO-8601 instant'); usage(2); }
let readyMarker: RegExp;
try { readyMarker = new RegExp(flags.get('ready-marker') ?? DEFAULTS.readyMarker, 'm'); } catch (e: any) { console.error(`--ready-marker: ${e.message}`); usage(2); }
let passMarker: RegExp;
try { passMarker = new RegExp(flags.get('pass-marker') ?? DEFAULTS.passMarker, 'm'); } catch (e: any) { console.error(`--pass-marker: ${e.message}`); usage(2); }
if (new RegExp(passMarker.source + '|').exec('')!.length < 2) { console.error('--pass-marker needs a capture group for the pass count'); usage(2); }
const passCap = Number(flags.get('pass-cap') ?? DEFAULTS.passCap);
if (!Number.isInteger(passCap) || passCap < 1) { console.error('--pass-cap must be a positive integer'); usage(2); }
const gateEvent = flags.get('gate-event') ?? DEFAULTS.gateEvent;
const maxArtifactRuns = Number(flags.get('max-artifact-runs') ?? DEFAULTS.maxArtifactRuns);
if (!Number.isInteger(maxArtifactRuns) || maxArtifactRuns < 0) { console.error('--max-artifact-runs must be a non-negative integer'); usage(2); }

function originRepo(): string {
  const origin = spawnSync('git', ['remote', 'get-url', 'origin'], { encoding: 'utf8', timeout: 10_000 });
  const host = (process.env.GH_HOST || 'github.com').replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
  const slug = new RegExp(`(?:^|[@/])${host}[:/]([^/:]+\\/[^/]+?)(?:\\.git)?\\/?$`).exec((origin.stdout ?? '').trim())?.[1];
  if (origin.status !== 0 || !slug) { console.error(`--repo owner/name is required: the origin remote is missing or not a ${process.env.GH_HOST || 'github.com'} owner/name`); usage(2); }
  return slug;
}

const options: ScorecardOptions = {
  repo: flags.get('repo') ?? originRepo(),
  base: flags.get('base') ?? DEFAULTS.base,
  now, sinceDays,
  crew: flags.has('crew') ? flags.get('crew')!.split(',').map(s => s.trim()).filter(Boolean) : null,
  gateWorkflow: flags.get('gate-workflow') ?? DEFAULTS.gateWorkflow,
  gateEvent: gateEvent === 'any' ? null : gateEvent,
  freeWorkflow: flags.get('free-workflow') ?? DEFAULTS.freeWorkflow,
  trainPrefix: flags.get('train-prefix') ?? DEFAULTS.trainPrefix,
  readyMarker, passMarker, passCap,
  maxArtifactRuns,
};

const cacheDir = flags.get('cache-dir') ?? path.join(os.tmpdir(), 'gstack-factory-scorecard', options.repo.replace('/', '__'));
const source = flags.has('fixtures')
  ? fixtureSource(JSON.parse(fs.readFileSync(flags.get('fixtures')!, 'utf8')) as FixtureFile)
  : ghSource(options.repo, cacheDir);

const card = collectScorecard(source, options);
const rows = scorecardRows(card);
const outDir = flags.get('out-dir') ?? path.join('.context', 'factory-scorecard');
fs.mkdirSync(outDir, { recursive: true });
const csvFile = flags.get('csv') ?? path.join(outDir, 'scorecard.csv');
fs.mkdirSync(path.dirname(csvFile), { recursive: true });
fs.writeFileSync(csvFile, renderCsv(card, rows));
fs.writeFileSync(path.join(outDir, 'scorecard.md'), renderMarkdown(card, rows));
if (json) fs.writeFileSync(path.join(outDir, 'scorecard.json'), JSON.stringify({ card, rows }, null, 2) + '\n');
const trendFile = path.join(outDir, 'trend.csv');
const [csvHeader, ...csvRows] = renderCsv(card, rows).split('\n').filter(Boolean);
const thisWindow = csvRows[0]!.split(',').slice(0, 3).join(',');
const kept = (fs.existsSync(trendFile) ? fs.readFileSync(trendFile, 'utf8').split('\n').filter(Boolean) : [])
  .filter(line => line !== csvHeader && !line.startsWith(thisWindow + ','));
fs.writeFileSync(trendFile, [csvHeader, ...kept, ...csvRows].join('\n') + '\n');

process.stdout.write(renderMarkdown(card, rows));
process.stdout.write(`SCORECARD_CSV: ${csvFile}\n`);
process.stdout.write(`SCORECARD_MD: ${path.join(outDir, 'scorecard.md')}\n`);
process.stdout.write(`SCORECARD_TREND: ${trendFile}\n`);