/**
 * Global XO CLI config layout (`XO_CONFIG_DIR` or ~/.config/xo-cli/).
 * User-provided paths (templates, invitation JSON) stay relative to cwd.
 */

import { existsSync, mkdirSync } from "node:fs";
import { homedir } from "node:os";
import { basename, isAbsolute, join, resolve } from "node:path";

/**
 * Base config directory. Created on first access.
 */
export function getConfigDir(): string {
  const dir =
    process.env["XO_CONFIG_DIR"] || join(homedir(), ".config", "xo-cli");
  mkdirSync(dir, { recursive: true });
  return dir;
}

/**
 * Directory for mnemonic wallet files (mnemonic-*).
 */
export function getMnemonicsDir(): string {
  const dir = join(getConfigDir(), "mnemonics");
  mkdirSync(dir, { recursive: true });
  return dir;
}

/**
 * Directory for engine DB and invitation storage SQLite files.
 */
export function getDataDir(): string {
  const dir = join(getConfigDir(), "data");
  mkdirSync(dir, { recursive: true });
  return dir;
}

/**
 * File storing CLI settings (JSON), including the last-used mnemonic reference.
 */
export function getSettingsPath(): string {
  return join(getConfigDir(), ".wallet");
}

/**
 * @deprecated Prefer {@link getSettingsPath}.
 */
export function getWalletConfigPath(): string {
  return getSettingsPath();
}

/**
 * Resolves a mnemonic reference to an absolute path.
 * Order: absolute path if it exists → path relative to cwd → config mnemonics directory/<basename>.
 *
 * @param mnemonicRef - Path or basename (e.g. `mnemonic-nuclear`)
 * @returns Absolute path to the mnemonic file
 * @throws If no matching file exists
 */
export function resolveMnemonicFilePath(mnemonicRef: string): string {
  if (isAbsolute(mnemonicRef) && existsSync(mnemonicRef)) {
    return mnemonicRef;
  }

  const relativeToCwd = resolve(process.cwd(), mnemonicRef);
  if (existsSync(relativeToCwd)) {
    return relativeToCwd;
  }

  const inMnemonics = join(getMnemonicsDir(), basename(mnemonicRef));
  if (existsSync(inMnemonics)) {
    return inMnemonics;
  }

  throw new Error(
    `Mnemonic file not found: ${mnemonicRef}. Run "xo-cli mnemonic list" to see available files.`,
  );
}