<?php

class Env
{
  private static $loaded = false;
  private static $values = [];

  public static function load( $path = '.env' )
  {
    if ( self::$loaded )
      return;

    self::$loaded = true;

    if ( !is_string( $path ) || $path === '' || !file_exists( $path ) )
      return;

    $lines = file( $path, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES );
    if ( !is_array( $lines ) )
      return;

    foreach ( $lines as $line )
    {
      $line = trim( $line );
      if ( $line === '' || strpos( $line, '#' ) === 0 )
        continue;

      $parts = explode( '=', $line, 2 );
      if ( count( $parts ) !== 2 )
        continue;

      $key = trim( $parts[0] );
      $value = trim( $parts[1] );
      if ( $key === '' )
        continue;

      if ( strlen( $value ) >= 2 )
      {
        $first = $value[0];
        $last = $value[strlen( $value ) - 1];
        if ( ( $first === '"' && $last === '"' ) || ( $first === "'" && $last === "'" ) )
          $value = substr( $value, 1, -1 );
      }

      self::$values[ $key ] = $value;
      $_ENV[ $key ] = $value;
      putenv( $key . '=' . $value );
    }
  }

  public static function get( $key, $default = null )
  {
    self::load();

    $value = getenv( $key );
    if ( $value !== false )
      return $value;

    if ( isset( self::$values[ $key ] ) )
      return self::$values[ $key ];

    return $default;
  }
}