const { readFileSync, readdirSync } = require('fs');
const fsx = require('fs-extra');
const { promisify } = require('util');
const lernaConfig = require('./lerna.json');

/**
 * grabs the lerna config, and then does a deep search of all packages and hard copies
 * the node_modules that need to be
 */
const main = async () => {
  // striping all the directory commands
  const packageSubDir = lernaConfig.packages.map((package) =>
    package.replace('/*', '').replace('//', ''),
  );
  // grabs packages directory array and flattens it
  const packagesDir = packageSubDir
    .map((location) =>
      readdirSync(`${location}`).map(
        (packageName) => `${location}/${packageName}`,
      ),
    )
    .flat();
  // Grabs each of the lerna package's package.json and returns it with its location
  const packageJsonMap = packagesDir.map((packageLocation) => {
    const stringedJson = readFileSync(
      `${__dirname}/${packageLocation}/package.json`,
    ).toString();
    return {
      location: packageLocation,
      content: JSON.parse(stringedJson),
    };
  });
  // gets the package names and lists and their file location
  const packageNameList = packageJsonMap.map((packageJson) => ({
    name: packageJson.content.name,
    location: packageJson.location,
  }));
  // checks for dependencies that need to be hard copied and returns what and where to copy to
  const packagesToUpdate = packageJsonMap
    .map((packageJson) => {
      // checks the deps of each package if any local lerna packages need to be pushed to it.
      const deps = packageNameList.map((packageName) => {
        if (
          Object.keys(packageJson.content.dependencies).includes(
            packageName.name,
          )
        ) {
          return {
            copy: `${__dirname}/${packageName.location}`,
            to: `${__dirname}/${packageJson.location}/node_modules/${packageName.name}`,
          };
        }
      });
      return deps; // returns friendly copy/to format
    })
    .flat() // flattens the array
    .filter((dep) => dep !== undefined); // removes all undefined
  const fileCopyArray = packagesToUpdate.map(async (packageToUpdate) => {
    const { copy, to } = packageToUpdate;
    try {
      await fsx.remove(to); // removes the symlink
      await fsx.copy(copy, to); // copies code into node_modules
    } catch (e) {
      throw e; // pray this doesn't happen
    }
  });
  Promise.all(fileCopyArray);
};

main();