import { join } from "@std/path";

function getHomeDir(): string {
  if (Deno.build.os === "windows") {
    const home = Deno.env.get("USERPROFILE");
    if (home == null) throw new Error("%USERPROFILE% missing");
    return home;
  } else {
    const home = Deno.env.get("HOME");
    if (home == null) throw new Error("$HOME missing");
    return home;
  }
}

export function getDataDir(): string {
  let base = Deno.env.get("HSH_DATA_DIR");
  if (base == null) {
    switch (Deno.build.os) {
      case "windows":
        base = Deno.env.get("APPDATA")!;
        break;
      case "darwin":
        // As far as I can tell, unlike Linux and Windows, this is just fixed
        base = join(getHomeDir(), "Library", "Application Support");
        break;
      default:
        base = Deno.env.get("XDG_DATA_HOME") ??
          join(getHomeDir(), ".local", "share");
    }
  }

  return join(base, "hsh");
}

export function getConfigDir(): string {
  let base: string;
  switch (Deno.build.os) {
    case "windows":
      base = Deno.env.get("APPDATA")!;
      break;
    default:
      base = Deno.env.get("XDG_CONFIG_HOME") ??
        join(getHomeDir(), ".config");
  }

  return join(base, "hsh");
}

export function likelyPath(path: string): boolean {
  return !path.includes(" ") && (path.includes("/") || path.includes(":"));
}