<?php

declare(strict_types=1);

namespace App\Komma\Globalization;

use App\Komma\Globalization\Datasets\Languages;
use Illuminate\Contracts\Support\Arrayable;

class Language implements \JsonSerializable, Arrayable
{
    /** @var Language[] */
    private static $cache = [];

    /** @var string */
    private $threeLetterISOLanguageName = '';

    /** @var string */
    private $twoLetterISOLanguageName = '';

    /** @var string */
    private $name = '';

    /** @var string */
    private $displayName = '';

    /** @var string */
    private $nativeName = '';

    /**
     * Language constructor. Does not allow regular instantiation. Use get instance instead
     */
    protected function __construct()
    {
    }

    /**
     * @param $name
     * @return static
     */
    public static function getInstance($name): self
    {
        //Create a new instance and parse its name.
        $instance = new static();
        $instance->parseName($name);

        if (! in_array($instance->name, array_keys(self::$cache), true)) { //Cache a new instance if it not already is.
            //First find the country by its ISO2 name
            $found = false;
            foreach (Languages::DATA as $index => $data) {
                if (strtolower($data['ISO-639-1']) === strtolower($instance->name)) {
                    //Then set data
                    $instance->displayName = $data['DisplayName'];
                    $instance->nativeName = $data['NativeName'];
                    $instance->twoLetterISOLanguageName = $data['ISO-639-1'];
                    $instance->threeLetterISOLanguageName = $data['ISO-639-3'] ?? $data['ISO-639-2'];
                    $found = true;
                    break;
                }
            }

            self::$cache[$instance->name] = $instance; //Cache this instance if not cached.
        }

        return self::$cache[$instance->name];
    }

    /**
     * Get the instance as an array.
     *
     * @return array
     */
    public function toArray()
    {
        return [
            'name' => $this->name,
            'displayName' => $this->displayName,
            'nativeName' => $this->nativeName,
            'twoLetterIsoLanguageName' => $this->twoLetterISOLanguageName,
            'threeLetterIsoLanguageName' => $this->threeLetterISOLanguageName,
        ];
    }

    /**
     * Specify data which should be serialized to JSON
     * @link https://php.net/manual/en/jsonserializable.jsonserialize.php
     * @return mixed data which can be serialized by <b>json_encode</b>,
     *               which is a value of any type other than a resource.
     * @since 5.4.0
     */
    public function jsonSerialize()
    {
        return $this->toArray();
    }

    /**
     * @param string $name
     */
    private function parseName(string $name)
    {
        $this->name = strtolower($name);
    }

    /**
     * @return string
     */
    public function getThreeLetterISOLanguageName(): string
    {
        return $this->threeLetterISOLanguageName;
    }

    /**
     * @return string
     */
    public function getTwoLetterISOLanguageName(): string
    {
        return $this->twoLetterISOLanguageName;
    }

    /**
     * @return string
     */
    public function getName(): string
    {
        return $this->name;
    }

    /**
     * @return string
     */
    public function getDisplayName(): string
    {
        return $this->displayName;
    }

    /**
     * @return string
     */
    public function getNativeName(): string
    {
        return $this->nativeName;
    }

    /**
     * @return bool
     */
    public function isComplete():bool
    {
        return
            $this->threeLetterISOLanguageName !== '' &&
            $this->twoLetterISOLanguageName !== '' &&
            $this->name !== '' &&
            $this->displayName !== '' &&
            $this->nativeName !== '';
    }
}