import { readFile } from "node:fs/promises";

import path from "node:path";

import { fileURLToPath, pathToFileURL } from "node:url";

import type { TranslationMap } from "../ui/src/i18n/lib/types.ts";

const ROOT = path.resolve(fileURLToPath(new URL("..", import.meta.url)));

const I18N_ASSETS_DIR = path.join(ROOT, "ui/src/i18n/.i18n");

const LOCALES_DIR = path.join(ROOT, "ui/src/i18n/locales");

const RAW_COPY_BASELINE_PATH = path.join(I18N_ASSETS_DIR, "raw-copy-baseline.json");

const SOURCE_LOCALE_PATH = path.join(LOCALES_DIR, "en.ts");

const DEFAULT_TOP = 10;

const LOCALE_LABELS: Record<string, string> = {

ar: "Arabic",

export type LocaleSummary = {

fallbackKeysInScope: string[];

meta: LocaleMeta;

sameAsEnglishKeys: string[];

};

type ReportInput = {

return value.trim().toLowerCase();

}

export function flattenTranslations(

value: TranslationMap,

prefix = "",

out = new Map<string, string>(),

) {

for (const [key, nested] of Object.entries(value)) {

const fullKey = prefix ? `${prefix}.${key}` : key;

if (typeof nested === "string") {

out.set(fullKey, nested);

continue;

}

flattenTranslations(nested, fullKey, out);

}

return out;

}

export function computeSameAsEnglishKeys(source: Map<string, string>, target: Map<string, string>) {

return [...target.entries()]

.filter(([key, value]) => source.get(key) === value)

.map(([key]) => key)

.toSorted();

}

export function filterTranslationKeysBySurface(keys: string[], surface?: string) {

if (!surface) {

return keys;

return lines;

}

if (

input.locale.fallbackKeysInScope.length === 0 &&

input.locale.sameAsEnglishKeys.length === 0

) {

if (input.locale.fallbackKeysInScope.length === 0) {

lines.push(` No ${input.locale.meta.locale} locale problems found in this scope.`);

return lines;

}

if (input.locale.fallbackKeysInScope.length > 0) {

lines.push(

` ${input.locale.meta.locale} has ${formatMissingKeyCount(input.locale.fallbackKeysInScope.length)}.`,

);

}

if (input.locale.sameAsEnglishKeys.length > 0) {

lines.push(

` ${formatSameAsEnglishIssue(input.locale.sameAsEnglishKeys.length, input.locale.meta.locale)}.`,

);

}

lines.push(

` ${input.locale.meta.locale} has ${formatMissingKeyCount(input.locale.fallbackKeysInScope.length)}.`,

);

return lines;

}

return `${count} ${count === 1 ? "fallback" : "fallbacks"}`;

}

function formatSameAsEnglishIssue(count: number, locale: string) {

if (count === 1) {

return `1 ${locale} translation still matches English and needs review`;

}

return `${count} ${locale} translations still match English and need review`;

}

function formatSurfaceLabel(surface?: string) {

if (!surface) {

return "all Control UI";

return JSON.parse(await readFile(metaPath, "utf8")) as LocaleMeta;

}

async function loadLocaleMap(locale: string): Promise<TranslationMap> {

const filePath = locale === "en" ? SOURCE_LOCALE_PATH : path.join(LOCALES_DIR, `${locale}.ts`);

if (!existsSync(filePath)) {

throw new Error(`unknown locale file: ${locale}`);

}

const exportName = locale.replaceAll("-", "_");

const mod = (await import(pathToFileURL(filePath).href)) as Record<string, TranslationMap>;

const map = mod[exportName];

if (!map) {

throw new Error(`locale ${locale} does not export ${exportName}`);

}

return map;

}

async function buildReport(args: ReportArgs) {

const baseline = await loadRawCopyBaseline();

const entries = filterRawCopyEntries(baseline.entries, args.surface);

};

if (args.locale) {

const [meta, source, target] = await Promise.all([

loadLocaleMeta(args.locale),

loadLocaleMap("en"),

loadLocaleMap(args.locale),

]);

const meta = await loadLocaleMeta(args.locale);

input.locale = {

fallbackKeysInScope: filterTranslationKeysBySurface(meta.fallbackKeys, args.surface),

meta,

sameAsEnglishKeys: filterTranslationKeysBySurface(

computeSameAsEnglishKeys(flattenTranslations(source), flattenTranslations(target)),

args.surface,

),

};

}