import { readdirSync, readFileSync, writeFileSync } from 'node:fs';
import { resolve } from 'node:path';
import type { Options } from 'prettier';
import { format } from 'prettier';
import options from '../.prettierrc.cjs';
import type { LocaleDefinition } from '../src';

const pathRoot = resolve(__dirname, '..');
const pathLocale = resolve(pathRoot, 'src', 'locale');
const pathLocales = resolve(pathRoot, 'src', 'locales');
const pathLocalesIndex = resolve(pathLocales, 'index.ts');
const pathDocsApiLocalization = resolve(
  pathRoot,
  'docs',
  'api',
  'localization.md'
);

const scriptCommand = 'pnpm run generate:locales';
const prettierTsOptions: Options = { ...options, parser: 'typescript' };
const prettierMdOptions: Options = { ...options, parser: 'markdown' };

const locales = readdirSync(pathLocales);
locales.splice(locales.indexOf('index.ts'), 1);

let localeIndexImports = "import type { LocaleDefinition } from '..';\n";
let localeIndexType = 'export type KnownLocale =\n';
let localeIndexLocales = 'const locales: KnownLocales = {\n';

let localizationLocales = '| Locale | Name |\n| :--- | :--- |\n';

const autoGeneratedCommentHeader = `/*
 * This file is automatically generated.
 * Run '${scriptCommand}' to update.
 */`;

for (const locale of locales) {
  // eslint-disable-next-line @typescript-eslint/no-var-requires
  const localeDef: LocaleDefinition = require('../src/locales/' +
    locale).default;
  const localeTitle = localeDef.title;

  localeIndexImports += `import ${locale} from './${locale}';\n`;
  localeIndexType += `  | '${locale}'\n`;
  localeIndexLocales += `  ${locale},\n`;
  localizationLocales += `| ${locale} | ${localeTitle} |\n`;

  // src/locale/<locale>.ts
  let content = `
      ${autoGeneratedCommentHeader}

      import { Faker } from '..';
      import ${locale} from '../locales/${locale}';
      ${locale !== 'en' ? "import en from '../locales/en';" : ''}

      const faker = new Faker({
        locale: '${locale}',
        localeFallback: 'en',
        locales: {
          ${locale},
          ${locale !== 'en' ? 'en,' : ''}
        },
      });

      export = faker;
      `;

  content = format(content, prettierTsOptions);
  writeFileSync(resolve(pathLocale, locale + '.ts'), content);
}

// src/locales/index.ts

let indexContent = `
  ${autoGeneratedCommentHeader}

  ${localeIndexImports}

  ${localeIndexType};

  export type KnownLocales = Record<KnownLocale, LocaleDefinition>;

  ${localeIndexLocales}};

  export default locales;
  `;

indexContent = format(indexContent, prettierTsOptions);

writeFileSync(pathLocalesIndex, indexContent);

// docs/api/localization.md

localizationLocales = format(localizationLocales, prettierMdOptions);

let localizationContent = readFileSync(pathDocsApiLocalization, 'utf-8');
localizationContent = localizationContent.replace(
  /(^<!-- LOCALES-AUTO-GENERATED-START -->$).*(^<!-- LOCALES-AUTO-GENERATED-END -->$)/gms,
  `$1\n\n<!-- Run '${scriptCommand}' to update. -->\n\n${localizationLocales}\n$2`
);
writeFileSync(pathDocsApiLocalization, localizationContent);