// Generates separate css files for each @it-corp/vpbank-core component
import path from "node:path";
import glob from "fast-glob";
import fs from "fs-extra";
import { generateScopedName } from "hash-css-selector";
import postcss from "postcss";
import postcssModules from "postcss-modules";
import postcssPresetMantine from "postcss-preset-mantine";
import { getPath } from "../utils/get-path";

function transformFileName(filePath: string) {
  return path.basename(filePath).replace(".module.css", ".css");
}

async function processFile(
  filePath: string,
  scopeBehaviour: "local" | "global",
  outputFolder: string
) {
  const result = await postcss([
    postcssPresetMantine,
    postcssModules({ generateScopedName, getJSON: () => {}, scopeBehaviour }),
  ]).process(fs.readFileSync(filePath, "utf-8"), {
    from: path.basename(filePath),
  });

  const fileName = transformFileName(filePath);
  await fs.writeFile(path.join(outputFolder, fileName), result.css);
  await fs.writeFile(
    path.join(outputFolder, fileName.replace(".css", ".layer.css")),
    `@layer itcorp {${result.css}}`
  );
}

// Generates styles.layers.css files for each @mantine/* component
async function generateCSSLayers() {
  const packagesPath = glob.convertPathToPattern(getPath(""));
  const files = await glob(`${packagesPath}/styles.css`);

  files.forEach((filePath) => {
    const directory = path.normalize(path.join(filePath, ".."));
    const fileContent = fs.readFileSync(filePath, "utf-8");
    const fileContentWitLayer = `@layer itcorp {${fileContent}}`;
    fs.writeFileSync(
      path.join(directory, "styles.layer.css"),
      fileContentWitLayer
    );
  });
}

// Generates individual css files for each @it-corp/vpbank-core component
export async function generateCoreCSS() {
  const packagesPath = glob.convertPathToPattern(getPath("src"));
  const files = await glob(`${packagesPath}/**/*.css`);
  const modules = files.filter((file) => file.endsWith(".module.css"));
  const global = files.find((file) => file.endsWith("global.css"))!;

  fs.writeJsonSync(
    getPath("docs/src/.docgen/css-exports.json"),
    {
      modules: modules.map(transformFileName),
      global: transformFileName(global),
    },
    { spaces: 2 }
  );

  const outputFolder = getPath("styles");

  await fs.ensureDir(outputFolder);

  modules.forEach((file) => processFile(file, "local", outputFolder));
  processFile(global, "global", outputFolder);
}

export async function generateCSS() {
  await generateCSSLayers();
  await generateCoreCSS();
}