// Draft user-facing release notes from the git log and write them into the listing files (text only; nothing is
// sent to a store). A human (or an agent with the whats-new skill) rewrites and translates before `play release` /
// `apple listing` push them.
//   storebound whats-new [--since v1.1.0] [--lang en-US] [--all] [--hook "text"] [--dry]
// --since: default the latest tag (git describe --tags --abbrev=0); --lang: the Play code / App Store locale to write
// (default: the Play default language and the first App Store locale); --all: write the same draft into every
// language (to translate afterwards; `storebound check` warns while they are identical).
import { readFileSync, writeFileSync } from 'node:fs';
import type { Ctx } from './lib/ctx';
import { log, warn } from './lib/log';
import { checkNotes, formatNotes, NOTES_LIMITS, noteItems, setAppleWhatsNew, setPlayWhatsNew } from './lib/whats-new';

function git(args: string[], cwd: string): string {
  const r = Bun.spawnSync(['git', ...args], { cwd, stdout: 'pipe', stderr: 'pipe' });
  if (r.exitCode !== 0) throw new Error(`git ${args.join(' ')}: ${r.stderr.toString().trim()}`);
  return r.stdout.toString();
}

export async function run(ctx: Ctx): Promise<void> {
  const { config, root, resolve } = ctx.loaded;
  const a = ctx.args;
  const since = a.get('since') ?? (() => { try { return git(['describe', '--tags', '--abbrev=0'], root).trim(); } catch { return ''; } })();
  const range = since ? `${since}..HEAD` : 'HEAD';
  const subjects = git(['log', range, '--no-merges', '--format=%s'], root).split('\n').filter(Boolean);
  const items = noteItems(subjects);
  log('whats-new', `${subjects.length} commits since ${since || 'the first commit'} -> ${items.length} user-facing items`);
  const hook = a.get('hook');
  const play = formatNotes(items, { hook, limit: NOTES_LIMITS.play });
  const apple = formatNotes(items, { hook, limit: NOTES_LIMITS.apple });
  for (const [store, text] of [['play', play], ['apple', apple]] as const) for (const p of checkNotes(text, store)) warn('whats-new', `${store}: ${p}`);
  console.log(`--- draft (Play, ${[...play].length}/500) ---\n${play}\n---`);
  if (a.has('dry')) return;

  const all = a.has('all');
  if (config.play) {
    const f = resolve(config.play.listing ?? 'store/listing.md');
    const lang = all ? '*' : a.get('lang') ?? config.play.defaultLanguage ?? 'en-US';
    const r = setPlayWhatsNew(readFileSync(f, 'utf8'), lang, play);
    if (r.changed.length) { writeFileSync(f, r.md); log('whats-new', `${f}: ${r.changed.join(', ')}`); } else warn('whats-new', `${f}: no section for ${lang}`);
  }
  if (config.apple) {
    const f = resolve(config.apple.listing ?? 'store/appstore.md');
    const first = config.apple.primaryLocale ?? config.languages.find(l => l.apple)?.apple ?? 'en-US';
    const locale = all ? '*' : a.get('lang') ?? first;
    const r = setAppleWhatsNew(readFileSync(f, 'utf8'), locale, apple);
    if (r.changed.length) { writeFileSync(f, r.md); log('whats-new', `${f}: ${r.changed.join(', ')}`); } else warn('whats-new', `${f}: no section for ${locale}`);
  }
  log('whats-new', 'draft written: edit it, translate every language, then storebound check');
}