<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Kwaadpepper\Serial\SerialCaster;

/**
 * Code.
 *
 * @property boolean                    $code_used     Is the code used ?
 * @property boolean                    $code_exported Is the code exported ?
 * @property \Illuminate\Support\Carbon $date_creation Date of creation.
 *
 * @property-read string|null $code_unique The unique code
 *
 * @method public static function intToSerial($int) Generate a serial from an int.
 * @method public static function serialToInt($serial) Get an int from a serial.
 *
 * @property-read \Illuminate\Database\Eloquent\Collection|\App\Models\Participation[] $participations
 * Associated participations.
 */
class Code extends Model
{
    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'code_used',
        'code_exported',
        'date_creation'
    ];

    /**
     * Indicates if the model should be timestamped.
     *
     * @var boolean
     */
    public $timestamps = false;

    // * RELATIONS

    /**
     * Has many Participation relation
     *
     * @return \Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function participations()
    {
        return $this->hasMany(Participation::class, 'code_unique_id');
    }

    // * FUNCTIONS
    /**
     * Generate code_unique attribute
     *
     * @return string|null
     */
    public function getCodeUniqueAttribute()
    {
        if (!$this->id or !\is_integer($this->id) or $this->id < 1) {
            return null;
        }
        return self::intToSerial($this->id);
    }

    /**
     * Generate a serial from an int.
     *
     * @param integer $int
     * @return string The serial
     * @throws SerialCasterException If an error happens du to config.
     */
    public static function intToSerial(int $int): string
    {
        return SerialCaster::encode(
            $int,
            \abs(\crc32(config('app.key'))),
            app(Settings::class)->code_length,
            config('codes.codeCharList')
        );
    }

    /**
     * Get an int from a serial.
     *
     * @param string $serial
     * @return integer The ID represented
     * @throws SerialCasterException If an error happens due to config or wrong serial is given.
     */
    public static function serialToInt(string $serial): int
    {
        return SerialCaster::decode(
            $serial,
            \abs(\crc32(config('app.key'))),
            config('codes.codeCharList')
        );
    }
}