import path from "path";
import fs from "fs";

// Явный порядок файлов внутри каждого языка
const fileOrder = [
  // index
  "index.md",
  // workflow
  "workflow/getting-started.md",
  "workflow/creating-app.md",
  "workflow/code-generation.md",
  "workflow/creating-pages.md",
  "workflow/creating-components.md",
  "workflow/styling.md",
  "workflow/data-fetching.md",
  "workflow/state-management.md",
  "workflow/localization.md",
  // basics
  "basics/tech-stack.md",
  "basics/architecture.md",
  "basics/code-style.md",
  "basics/naming.md",
  "basics/documentation.md",
  "basics/typing.md",
  // applied
  "applied/vscode.md",
  "applied/project-structure.md",
  "applied/components.md",
  "applied/page-level.md",
  "applied/templates-generation.md",
  "applied/styles.md",
  "applied/images-sprites.md",
  "applied/svg-sprites.md",
  "applied/video.md",
  "applied/api.md",
  "applied/stores.md",
  "applied/hooks.md",
  "applied/fonts.md",
  "applied/localization.md",
];

// Удалить frontmatter из содержимого md-файла
const stripFrontmatter = (content) =>
  content.replace(/^---[\s\S]*?---\n*/m, "");

// Сдвинуть уровень заголовков на 1 вниз (h1→h2, h2→h3, ...)
// Не трогает заголовки внутри блоков кода
const shiftHeadings = (content) => {
  const lines = content.split("\n");
  let inCodeBlock = false;

  return lines
    .map((line) => {
      if (line.startsWith("```")) inCodeBlock = !inCodeBlock;
      if (inCodeBlock) return line;
      if (/^#{1,5}\s/.test(line)) return "#" + line;
      return line;
    })
    .join("\n");
};

// Собрать RULES.md с мета-якорями для каждого файла
const buildRules = (lang) => {
  const srcDir = `./docs/${lang}`;
  const outDir = `./generated/${lang}`;
  const outFile = path.join(outDir, "RULES.md");

  if (!fs.existsSync(srcDir)) {
    console.log(`Пропуск ${lang}: папка ${srcDir} не найдена`);
    return;
  }

  fs.mkdirSync(outDir, { recursive: true });

  const parts = [];

  for (const file of fileOrder) {
    const filePath = path.join(srcDir, file);
    if (!fs.existsSync(filePath)) continue;

    const raw = fs.readFileSync(filePath, "utf8");
    const content = stripFrontmatter(raw).trim();
    if (!content) continue;

    // Мета-якорь: путь VitePress без расширения
    const route = "/" + file.replace(/\.md$/, "");
    // index.md остаётся без сдвига (его h1 — главный заголовок документа)
    const processed = file === "index.md" ? content : shiftHeadings(content);
    parts.push(`<!-- ${route} -->\n${processed}`);
  }

  fs.writeFileSync(outFile, parts.join("\n\n"), "utf8");
  console.log(`RULES.md (${lang}) создан: ${outFile}`);
};

// Собираем RULES.md для обоих языков
buildRules("ru");
buildRules("en");

// Генерируем README из index.md
const buildReadme = (lang, outFile) => {
  const indexPath = `./docs/${lang}/index.md`;

  if (!fs.existsSync(indexPath)) {
    console.log(`Пропуск README (${lang}): ${indexPath} не найден`);
    return;
  }

  const content = stripFrontmatter(fs.readFileSync(indexPath, "utf8"));
  fs.writeFileSync(outFile, content, "utf8");
  console.log(`${outFile} создан из ${indexPath}`);
};

buildReadme("en", "./README.md");
buildReadme("ru", "./README_RU.md");