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

// Loads KEY=VALUE pairs from a local .env-style file into process.env,
// without overwriting anything already set (real env vars / CI secrets
// always win over the file). No external dependency needed for this - the
// format is simple enough to parse directly.
function loadLocalEnvFile(filePath: string): void {
  if (!fs.existsSync(filePath)) return;
  const content = fs.readFileSync(filePath, 'utf-8');
  for (const rawLine of content.split('\n')) {
    const line = rawLine.trim();
    if (!line || line.startsWith('#')) continue;
    const eqIdx = line.indexOf('=');
    if (eqIdx === -1) continue;
    const key = line.slice(0, eqIdx).trim();
    let value = line.slice(eqIdx + 1).trim();
    if ((value.startsWith('"') && value.endsWith('"')) || (value.startsWith("'") && value.endsWith("'"))) {
      value = value.slice(1, -1);
    }
    if (key && process.env[key] === undefined) {
      process.env[key] = value;
    }
  }
}

// .env.test.local is git-ignored (matches the existing `*.local` gitignore
// pattern) - it holds real local credentials and is never required in CI,
// where GitHub Secrets populate the same variable names directly.
// Resolved from process.cwd() (not __dirname/import.meta.url) since this
// project runs as an ES module, where __dirname isn't available - Playwright
// and its config are always invoked from the project root anyway.
loadLocalEnvFile(path.resolve(process.cwd(), '.env.test.local'));

export type EnvName = 'dev' | 'staging' | 'production';

// Accepts both branch names (develop/staging/main - what CI sets ENV to,
// since e2e-tests.yml derives it from github.ref_name) and semantic names
// (dev/staging/production), so the same ENV value works whether it came
// from a branch push or a manual `ENV=production npm run test:e2e:prod`.
const ENV_ALIASES: Record<string, EnvName> = {
  develop: 'dev', dev: 'dev', development: 'dev', devpro: 'dev', local: 'dev', localenv: 'dev',
  staging: 'staging', stage: 'staging',
  main: 'production', production: 'production', prod: 'production',
};

export function resolveEnvName(): EnvName {
  const raw = (process.env.ENV || 'develop').toLowerCase();
  return ENV_ALIASES[raw] || 'dev';
}

export interface EnvironmentConfig {
  envName: EnvName;
  baseURL: string;
  username: string;
  password: string;
}

export function getEnvironmentConfig(): EnvironmentConfig {
  const envName = resolveEnvName();

  // dev and staging are genuinely separate deployments/branches - dev has
  // its own DEV_URL now (falls back to the old shared stagingenv URL if
  // DEV_URL isn't set, e.g. for local runs that haven't configured it yet).
  const baseURLs: Record<EnvName, string> = {
    dev: process.env.DEV_URL || 'https://stagingenv.babinnovations.com',
    staging: 'https://stagingenv.babinnovations.com',
    production: 'https://www.babinnovations.com/neopaas/portal',
  };

  // dev prefers its own DEV_USERNAME/PASSWORD, falling back to the older
  // shared TEST_USERNAME/PASSWORD pair for compatibility with existing local
  // .env.test.local setups. Staging falls back to that same shared pair
  // unless STAGING_TEST_* is explicitly set. Production always requires its
  // own PROD_TEST_* pair.
  const credentials: Record<EnvName, { username: string; password: string }> = {
    dev: {
      username: process.env.DEV_USERNAME || process.env.TEST_USERNAME || '',
      password: process.env.DEV_PASSWORD || process.env.TEST_PASSWORD || '',
    },
    staging: {
      username: process.env.STAGING_TEST_USERNAME || process.env.TEST_USERNAME || '',
      password: process.env.STAGING_TEST_PASSWORD || process.env.TEST_PASSWORD || '',
    },
    production: {
      username: process.env.PROD_TEST_USERNAME || '',
      password: process.env.PROD_TEST_PASSWORD || '',
    },
  };

  return {
    envName,
    baseURL: process.env.BASE_URL || baseURLs[envName],
    username: credentials[envName].username,
    password: credentials[envName].password,
  };
}