<?php
  
  /**
   * This file is part of the Carbon package.
   *
   * (c) Brian Nesbitt <brian@nesbot.com>
   *
   * For the full copyright and license information, please view the LICENSE
   * file that was distributed with this source code.
   */
  
  namespace Carbon;
  
  use JsonSerializable;
  use ReturnTypeWillChange;
  
  class Language implements JsonSerializable
  {
      /**
       * @var array
       */
      protected static $languagesNames;
  
      /**
       * @var array
       */
      protected static $regionsNames;
  
      /**
       * @var string
       */
      protected $id;
  
      /**
       * @var string
       */
      protected $code;
  
      /**
       * @var string|null
       */
      protected $variant;
  
      /**
       * @var string|null
       */
      protected $region;
  
      /**
       * @var array
       */
      protected $names;
  
      /**
       * @var string
       */
      protected $isoName;
  
      /**
       * @var string
       */
      protected $nativeName;
  
      public function __construct(string $id)
      {
          $this->id = str_replace('-', '_', $id);
          $parts = explode('_', $this->id);
          $this->code = $parts[0];
  
          if (isset($parts[1])) {
              if (!preg_match('/^[A-Z]+$/', $parts[1])) {
                  $this->variant = $parts[1];
                  $parts[1] = $parts[2] ?? null;
              }
              if ($parts[1]) {
                  $this->region = $parts[1];
              }
          }
      }
  
      /**
       * Get the list of the known languages.
       *
       * @return array
       */
      public static function all()
      {
          if (!static::$languagesNames) {
              static::$languagesNames = require __DIR__.'/List/languages.php';
          }
  
          return static::$languagesNames;
      }
  
      /**
       * Get the list of the known regions.
       *
       * @return array
       */
      public static function regions()
      {
          if (!static::$regionsNames) {
              static::$regionsNames = require __DIR__.'/List/regions.php';
          }
  
          return static::$regionsNames;
      }
  
      /**
       * Get both isoName and nativeName as an array.
       *
       * @return array
       */
      public function getNames(): array
      {
          if (!$this->names) {
              $this->names = static::all()[$this->code] ?? [
                  'isoName' => $this->code,
                  'nativeName' => $this->code,
              ];
          }
  
          return $this->names;
      }
  
      /**
       * Returns the original locale ID.
       *
       * @return string
       */
      public function getId(): string
      {
          return $this->id;
      }
  
      /**
       * Returns the code of the locale "en"/"fr".
       *
       * @return string
       */
      public function getCode(): string
      {
          return $this->code;
      }
  
      /**
       * Returns the variant code such as cyrl/latn.
       *
       * @return string|null
       */
      public function getVariant(): ?string
      {
          return $this->variant;
      }
  
      /**
       * Returns the variant such as Cyrillic/Latin.
       *
       * @return string|null
       */
      public function getVariantName(): ?string
      {
          if ($this->variant === 'Latn') {
              return 'Latin';
          }
  
          if ($this->variant === 'Cyrl') {
              return 'Cyrillic';
          }
  
          return $this->variant;
      }
  
      /**
       * Returns the region part of the locale.
       *
       * @return string|null
       */
      public function getRegion(): ?string
      {
          return $this->region;
      }
  
      /**
       * Returns the region name for the current language.
       *
       * @return string|null
       */
      public function getRegionName(): ?string
      {
          return $this->region ? (static::regions()[$this->region] ?? $this->region) : null;
      }
  
      /**
       * Returns the long ISO language name.
       *
       * @return string
       */
      public function getFullIsoName(): string
      {
          if (!$this->isoName) {
              $this->isoName = $this->getNames()['isoName'];
          }
  
          return $this->isoName;
      }
  
      /**
       * Set the ISO language name.
       *
       * @param string $isoName
       */
      public function setIsoName(string $isoName): self
      {
          $this->isoName = $isoName;
  
          return $this;
      }
  
      /**
       * Return the full name of the language in this language.
       *
       * @return string
       */
      public function getFullNativeName(): string
      {
          if (!$this->nativeName) {
              $this->nativeName = $this->getNames()['nativeName'];
          }
  
          return $this->nativeName;
      }
  
      /**
       * Set the name of the language in this language.
       *
       * @param string $nativeName
       */
      public function setNativeName(string $nativeName): self
      {
          $this->nativeName = $nativeName;
  
          return $this;
      }
  
      /**
       * Returns the short ISO language name.
       *
       * @return string
       */
      public function getIsoName(): string
      {
          $name = $this->getFullIsoName();
  
          return trim(strstr($name, ',', true) ?: $name);
      }
  
      /**
       * Get the short name of the language in this language.
       *
       * @return string
       */
      public function getNativeName(): string
      {
          $name = $this->getFullNativeName();
  
          return trim(strstr($name, ',', true) ?: $name);
      }
  
      /**
       * Get a string with short ISO name, region in parentheses if applicable, variant in parentheses if applicable.
       *
       * @return string
       */
      public function getIsoDescription()
      {
          $region = $this->getRegionName();
          $variant = $this->getVariantName();
  
          return $this->getIsoName().($region ? ' ('.$region.')' : '').($variant ? ' ('.$variant.')' : '');
      }
  
      /**
       * Get a string with short native name, region in parentheses if applicable, variant in parentheses if applicable.
       *
       * @return string
       */
      public function getNativeDescription()
      {
          $region = $this->getRegionName();
          $variant = $this->getVariantName();
  
          return $this->getNativeName().($region ? ' ('.$region.')' : '').($variant ? ' ('.$variant.')' : '');
      }
  
      /**
       * Get a string with long ISO name, region in parentheses if applicable, variant in parentheses if applicable.
       *
       * @return string
       */
      public function getFullIsoDescription()
      {
          $region = $this->getRegionName();
          $variant = $this->getVariantName();
  
          return $this->getFullIsoName().($region ? ' ('.$region.')' : '').($variant ? ' ('.$variant.')' : '');
      }
  
      /**
       * Get a string with long native name, region in parentheses if applicable, variant in parentheses if applicable.
       *
       * @return string
       */
      public function getFullNativeDescription()
      {
          $region = $this->getRegionName();
          $variant = $this->getVariantName();
  
          return $this->getFullNativeName().($region ? ' ('.$region.')' : '').($variant ? ' ('.$variant.')' : '');
      }
  
      /**
       * Returns the original locale ID.
       *
       * @return string
       */
      public function __toString()
      {
          return $this->getId();
      }
  
      /**
       * Get a string with short ISO name, region in parentheses if applicable, variant in parentheses if applicable.
       *
       * @return string
       */
      #[ReturnTypeWillChange]
      public function jsonSerialize()
      {
          return $this->getIsoDescription();
      }
  }