import * as fs from 'fs';
import * as path from 'path';
import * as os from 'os';

const GLOBAL_ENV_PATH = path.join(os.homedir(), '.openclaw', '.env');

/**
 * Load ~/.openclaw/.env into process.env.
 * Always reads fresh from disk — no caching.
 * File values always override process.env.
 */
export function loadGlobalEnv(): void {
  applyEnvFile();
}

/**
 * Force re-read ~/.openclaw/.env.
 * Same as loadGlobalEnv — always reads fresh.
 */
export function reloadGlobalEnv(): void {
  applyEnvFile();
}

function applyEnvFile(): void {
  let content: string;
  try {
    content = fs.readFileSync(GLOBAL_ENV_PATH, 'utf-8');
  } catch {
    return; // file doesn't exist — that's fine
  }

  for (const line of content.split('\n')) {
    const trimmed = line.trim();
    if (!trimmed || trimmed.startsWith('#')) continue;

    const eqIdx = trimmed.indexOf('=');
    if (eqIdx < 1) continue;

    const key = trimmed.slice(0, eqIdx).trim();
    let value = trimmed.slice(eqIdx + 1).trim();

    // strip surrounding quotes
    if ((value.startsWith('"') && value.endsWith('"')) || (value.startsWith("'") && value.endsWith("'"))) {
      value = value.slice(1, -1);
    }

    // Always use file value — real-time read, no caching
    process.env[key] = value;
  }
}