import fs from "fs-extra";
import os from "os";
import path from "path";

const xdgConfigPath = function(file: string): string | undefined {
  const xdgConfigHome = process.env.XDG_CONFIG_HOME;
  if (xdgConfigHome) {
    const rcDir = path.join(xdgConfigHome, "luban");
    if (!fs.existsSync(rcDir)) {
      fs.ensureDirSync(rcDir, 0o700);
    }
    return path.join(rcDir, file);
  }
};

const migrateWindowsConfigPath = function(file: string): void {
  if (process.platform !== "win32") {
    return;
  }
  const appData = process.env.APPDATA;
  if (appData) {
    const rcDir = path.join(appData, "luban");
    const rcFile = path.join(rcDir, file);
    const properRcFile = path.join(os.homedir(), file);
    if (fs.existsSync(rcFile)) {
      try {
        if (fs.existsSync(properRcFile)) {
          fs.removeSync(rcFile);
        } else {
          fs.moveSync(rcFile, properRcFile);
        }
      } catch (e) {}
    }
  }
};

export const getRcPath = function(file: string): string {
  migrateWindowsConfigPath(file);
  return xdgConfigPath(file) || path.join(os.homedir(), file);
};