<?php

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();
	}
}
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