#!/usr/bin/env bun
/**
 * Counts candidate hardcoded user-facing strings in the web UI.
 *
 * Two jobs. It sizes the localization work (docs/localization.md quotes its output), and once an area
 * reaches zero it becomes the guard that stops the debt coming back — see ZEROED below.
 *
 * It is a heuristic and it is deliberately a FLOOR. It cannot see multi-line JSX text, ternaries
 * inside JSX, strings passed down as props, or anything a plugin renders. A falling number means
 * progress; a zero means "nothing this scanner can see", not "nothing left".
 *
 *   bun scripts/i18n/scan-hardcoded.ts            # summary by area
 *   bun scripts/i18n/scan-hardcoded.ts --files    # worst files first
 *   bun scripts/i18n/scan-hardcoded.ts --list ui.button   # print the strings themselves
 *   bun scripts/i18n/scan-hardcoded.ts --check    # non-zero exit if a zeroed area regressed
 */
import { readdirSync, readFileSync, statSync } from 'node:fs';
import { join } from 'node:path';

const AREAS = [
  { label: 'officer-web (shell)', root: 'src/apps/officer-web' },
  { label: 'officerdev (panels)', root: 'src/workspaces/officerdev/src' },
  { label: 'shared components', root: 'src/workspaces/components' },
] as const;

/**
 * Areas that have been converted and must stay converted. Add an area here the moment it reaches
 * zero — enabling every area on day one would just be red for weeks and get ignored.
 */
const ZEROED: string[] = [];

const SKIP = /node_modules|\.gen\.|[/\\]locales[/\\]|[/\\]vendor[/\\]|\.test\.|\.d\.ts$/;

// A quoted literal, single or double. Kept as two groups because JS has no branch reset.
const Q = String.raw`(?:"([^"\n]{2,120})"|'([^'\n]{2,120})')`;

const PATTERNS: { kind: string; rx: RegExp }[] = [
  // >Some visible words<
  { kind: 'jsx text', rx: />\s*([A-Z][A-Za-z0-9][^<>{}\n]{2,100}?)\s*</g },
  // placeholder="..." and friends
  {
    kind: 'attributes',
    rx: new RegExp(String.raw`\b(?:placeholder|title|aria-label|alt|label|description|tooltip|emptyMessage)\s*=\s*` + Q, 'g'),
  },
  { kind: 'toast/alert', rx: new RegExp(String.raw`\b(?:toast(?:\.\w+)?|alert|confirm)\s*\(\s*` + Q, 'g') },
  // label: 'Status' — nav items, menus, table columns. The largest hidden category.
  {
    kind: 'object labels',
    rx: new RegExp(String.raw`\b(?:label|name|title|heading|placeholder|description|tooltip|emptyText)\s*:\s*` + Q, 'g'),
  },
  { kind: 'thrown errors', rx: new RegExp(String.raw`new Error\(\s*` + Q, 'g') },
  // `Failed to create ${kind}` — needs interpolation, so it costs more to convert.
  { kind: 'template str', rx: /`([A-Z][^`\n]{4,100}\$\{[^`]*)`/g },
];

/** Filters out ids, class names, paths, mime types and SCREAMING_CONSTANTS. */
function isHuman(value: string | undefined): value is string {
  if (!value) return false;
  const s = value.trim();
  if (s.length < 3) return false;
  if (!/[A-Za-z]{3}/.test(s)) return false;
  if (/^[a-z0-9\-_./:]+$/.test(s)) return false;
  if (/^(https?:|\/|#|data:|application\/|image\/)/.test(s)) return false;
  if (/^[A-Z0-9_]+$/.test(s)) return false;
  return true;
}

function* walk(dir: string): Generator<string> {
  let entries: string[];
  try {
    entries = readdirSync(dir);
  } catch {
    return;
  }
  for (const entry of entries) {
    const path = join(dir, entry);
    if (SKIP.test(path)) continue;
    let isDir = false;
    try {
      isDir = statSync(path).isDirectory();
    } catch {
      continue;
    }
    if (isDir) yield* walk(path);
    else if (path.endsWith('.tsx') || path.endsWith('.ts')) yield path;
  }
}

type Hit = { kind: string; value: string; file: string };

function scan(root: string): { files: number; hits: Hit[] } {
  const hits: Hit[] = [];
  let files = 0;

  for (const file of walk(root)) {
    files++;
    let source: string;
    try {
      source = readFileSync(file, 'utf8');
    } catch {
      continue;
    }
    for (const { kind, rx } of PATTERNS) {
      rx.lastIndex = 0;
      for (const match of source.matchAll(rx)) {
        const value = match.slice(1).find((group) => group !== undefined);
        if (isHuman(value)) hits.push({ kind, value: value.trim(), file });
      }
    }
  }
  return { files, hits };
}

const args = new Set(process.argv.slice(2));
const listPrefix = process.argv.includes('--list') ? process.argv[process.argv.indexOf('--list') + 1] : undefined;

const results = AREAS.map((area) => ({ ...area, ...scan(area.root) }));
const kinds = PATTERNS.map((p) => p.kind);
const pad = (s: string | number, n: number) => String(s).padStart(n);

console.log(`${'area'.padEnd(22)} ${pad('files', 5)} ${kinds.map((k) => pad(k.slice(0, 13), 14)).join('')} ${pad('total', 7)}`);
for (const r of results) {
  const byKind = kinds.map((k) => pad(r.hits.filter((h) => h.kind === k).length, 14)).join('');
  console.log(`${r.label.padEnd(22)} ${pad(r.files, 5)} ${byKind} ${pad(r.hits.length, 7)}`);
}

const all = results.flatMap((r) => r.hits);
const distinct = new Set(all.map((h) => h.value));
const interpolated = new Set(all.filter((h) => h.kind === 'template str').map((h) => h.value));

console.log(`${'TOTAL'.padEnd(22)} ${pad(results.reduce((n, r) => n + r.files, 0), 5)} ${kinds.map((k) => pad(all.filter((h) => h.kind === k).length, 14)).join('')} ${pad(all.length, 7)}`);
console.log();
console.log(`occurrences        ${all.length}`);
console.log(`distinct strings   ${distinct.size}`);
console.log(`  needing params   ${interpolated.size}`);

if (args.has('--files')) {
  console.log('\nworst files:');
  const perFile = new Map<string, number>();
  for (const h of all) perFile.set(h.file, (perFile.get(h.file) ?? 0) + 1);
  for (const [file, n] of [...perFile].sort((a, b) => b[1] - a[1]).slice(0, 25)) {
    console.log(`  ${pad(n, 4)}  ${file}`);
  }
}

if (listPrefix) {
  console.log(`\nstrings in files matching "${listPrefix}":`);
  for (const h of all.filter((x) => x.file.includes(listPrefix))) console.log(`  [${h.kind}] ${h.value}`);
}

if (args.has('--check')) {
  const regressed = results.filter((r) => ZEROED.includes(r.label) && r.hits.length > 0);
  if (regressed.length > 0) {
    console.error('\nThese areas were converted and have regressed:');
    for (const r of regressed) console.error(`  ${r.label}: ${r.hits.length} hardcoded strings`);
    console.error('\nUse a catalog key. See docs/localization.md.');
    process.exit(1);
  }
  console.log(`\ncheck: ok (${ZEROED.length} area(s) held at zero)`);
}