<?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;
 
 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 = include __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 = include __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
      */
     public function jsonSerialize()
     {
         return $this->getIsoDescription();
     }
 }