import fs from 'node:fs/promises';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

// Raiz do projeto resolvida a partir deste arquivo (src/env.mjs -> pasta acima),
// para funcionar igual quando o servidor e iniciado pelo launcher (cwd diferente).
export const projectRoot = path.dirname(fileURLToPath(new URL('.', import.meta.url)));

export const paths = {
  root: projectRoot,
  data: path.join(projectRoot, 'data'),
  db: process.env.APP_DB_PATH || path.join(projectRoot, 'data', 'maquina-pessoal.db'),
  whatsappAuth: process.env.APP_WHATSAPP_AUTH_DIR || path.join(projectRoot, 'data', 'runtime', 'whatsapp-auth'),
  exports: path.join(projectRoot, 'data', 'exports'),
  seeds: path.join(projectRoot, 'data', 'seeds'),
  cnpjDir: process.env.CNPJ_BASE_DIR || path.join(projectRoot, 'prospeccao', 'cnpj'),
  rfbRaw: path.join(projectRoot, 'prospeccao', 'cnpj', 'rfb-raw'),
  config: path.join(projectRoot, 'prospeccao', 'config.json'),
  public: path.join(projectRoot, 'public')
};

export let APP_PORT = envNumber('APP_PORT', 3910);
export let APP_HOST = envString('APP_HOST', '127.0.0.1');

function refreshEnvDerivedValues() {
  paths.db = process.env.APP_DB_PATH || path.join(projectRoot, 'data', 'maquina-pessoal.db');
  paths.whatsappAuth = process.env.APP_WHATSAPP_AUTH_DIR || path.join(projectRoot, 'data', 'runtime', 'whatsapp-auth');
  paths.cnpjDir = process.env.CNPJ_BASE_DIR || path.join(projectRoot, 'prospeccao', 'cnpj');
  paths.rfbRaw = path.join(paths.cnpjDir, 'rfb-raw');
  APP_PORT = envNumber('APP_PORT', 3910);
  APP_HOST = envString('APP_HOST', '127.0.0.1');
}

export async function loadDotEnv(rootDir = projectRoot) {
  try {
    const content = await fs.readFile(path.join(rootDir, '.env'), 'utf8');

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

      const separator = trimmed.indexOf('=');
      if (separator === -1) continue;

      const key = trimmed.slice(0, separator).trim();
      const value = trimmed.slice(separator + 1).trim();
      if (!process.env[key]) process.env[key] = value;
    }

    refreshEnvDerivedValues();
  } catch (error) {
    if (error.code !== 'ENOENT') throw error;
  }
}

export function envNumber(name, fallback) {
  const value = Number(process.env[name]);
  return Number.isFinite(value) && value > 0 ? value : fallback;
}

export function envString(name, fallback) {
  return process.env[name] || fallback;
}

export function telegramConfig() {
  return {
    enabled: process.env.TELEGRAM_ALERTS_ENABLED === 'true',
    botToken: process.env.TELEGRAM_BOT_TOKEN || '',
    chatId: process.env.TELEGRAM_CHAT_ID || ''
  };
}