import { readFileSync } from "fs";
import { join } from "path";
import { findUpSync } from "find-up";
import * as dotenv from "dotenv";
import { DefaultEnvFilesToRead } from "./constants";
import { getFormattedError } from "./utils/errror";

const getRoot = function isProjectRoot() {
  const root = findUpSync("resocket.json"); //do with node_modules?
  if (!root)
    throw new Error(
      getFormattedError({
        coreMessage: "Unable to locate resocket.json file",
        humanMessage:
          "You can add a resocket.json file at the root of your project~",
      })
    );

  return root;
};

export const readEnv = (
  envFiles: string[] = DefaultEnvFilesToRead
): Record<string, string> => {
  let filesToRead = envFiles;

  const rootDir = join(getRoot(), "..");
  const filePaths: Array<string> = [];

  for (let file of filesToRead) {
    const filePath = findUpSync(file, { stopAt: rootDir });

    if (filePath) filePaths.push(filePath);
  }

  if (filePaths.length < 1) return {};

  let envs = {};
  for (let filePath of filePaths) {
    envs = { ...envs, ...dotenv.parse(readFileSync(filePath, "utf8")) };
  }

  return envs;
};