<?php
namespace Gbili;

class DotEnv {

  public static function loadFromFile($filepath) {
    if (!file_exists($filepath)) {
      throw new \Exception('Cannot find file');
    }
    $contents = file_get_contents($filepath);
    $lines = explode(PHP_EOL, $contents);
    $envvars = array_reduce($lines, function ($vars, $line) {
      $parts = explode('=', $line);
      $partsCount = count($parts);
      if ($partsCount === 1 && strlen($parts[0]) <= 0) {
        return $vars;
      }
      [$varname, $value] = $partsCount === 1
        ? [$parts[0], '']
        : ($partsCount > 2
          ? [$parts[0], implode('=', array_slice($parts, 1))]
          : $parts
        );
      $trimmedValue = trim($value);
      $vars[trim($varname)] = self::removeOuterQuotes($trimmedValue);
      return $vars;
    }, []);
    return $envvars;
  }

  public static function removeOuterQuotes(string $string, $quote = "'"): string {
    $lastCharIndex = strlen($string) - 1;
    $stringWithoutOuterQuotes = strpos($string, $quote) === 0 && strpos($string, $quote, -1) === $lastCharIndex
      ? substr($string, 1, $lastCharIndex)
      : $string;

    if ($quote === '"') {
      return $stringWithoutOuterQuotes;
    }

    $noQuotesRemoved = strlen($stringWithoutOuterQuotes) === strlen($string);

    if ($noQuotesRemoved && $quote === "'") {
      return self::removeOuterQuotes($string, '"');
    }

    return $stringWithoutOuterQuotes;
  }

  public static function MUTATE_ENV_addEnvVars(array $variables) {
    $_ENV = array_merge($_ENV, $variables);
  }

  public static function load(string $rootDir) {
    $envvars = self::loadFromFile($rootDir . DIRECTORY_SEPARATOR . '.env');
    self::MUTATE_ENV_addEnvVars($envvars);
  }

}