import { existsSync, readFileSync } from "node:fs";
import { homedir, platform } from "node:os";
import path from "node:path";
import { fileURLToPath } from "node:url";

const rootDir = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");

function hutchChannelForElectrobunVersion(version) {
  return version.includes("-") ? "canary" : "production";
}

function hutchBinaryName(channel) {
  const base = channel === "canary" ? "hutch-canary" : "hutch";
  return platform() === "win32" ? `${base}.exe` : base;
}

export function getElectrobunVersion() {
  const packageJsonPath = path.join(rootDir, "node_modules/electrobun/package.json");
  return JSON.parse(readFileSync(packageJsonPath, "utf8")).version;
}

export function resolveHutchCommand(environment = process.env) {
  if (environment.ELECTROBUN_HUTCH_BINARY) {
    return environment.ELECTROBUN_HUTCH_BINARY;
  }

  const channel = hutchChannelForElectrobunVersion(getElectrobunVersion());
  const dashHome = environment.DASH_HOME || path.join(homedir(), ".dash");
  const pathApi = platform() === "win32" ? path.win32 : path.posix;
  return pathApi.join(dashHome, "bin", hutchBinaryName(channel));
}

export function hutchIsInstalled(command = resolveHutchCommand()) {
  return existsSync(command);
}