<?php

namespace Glmdev\Meta;

use Glmdev\Foundation\FoundationModel;
use Glmdev\Meta\Contracts\MetaContract;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Schema\Blueprint;
use Ramsey\Uuid\Uuid;

class Meta extends Model implements FoundationModel, MetaContract
{
    /**
     * Allow the changing of the meta and uuid database fields.
     * 
     * @var array
     */
    protected $fillable = ['meta', 'uuid'];

    /**
     * Ensure the model recieves valid UUID and meta columns when created.
     *
     * @param array $args
     *
     * @return callable
     */
    public static function create( array $args = [] ){
        $args['meta'] = (isset($args['meta'])) ? $args['meta'] : serialize([]);
        $args['uuid'] = (isset($args['uuid'])) ? $args['uuid'] : '';

        return parent::create($args);
    }

    /**
     * Read the serialized value.
     *
     * @param string|int $key
     *
     * @return string|int|float|array|bool|null
     */
    public function read( $key ){
        $meta = unserialize( $this->meta );

        if ( array_key_exists( $key, $meta ) ){
            return $meta[ $key ];
        }

        return null;
    }

    /**
     * Adds the key-value pair into the serialized data set.
     *
     * @param string|int $key
     * @param string|int|float|array|bool|null $value
     *
     * @return void
     */
    public function write( $key, $value ){
        $meta = unserialize( $this->meta );
        $meta[ $key ] = $value;
        $meta = serialize( $meta );
        $this->meta = $meta;
        $this->save();
    }

    /**
     * Get the serialized value of the meta info.
     *
     * @return string
     */
    public function readRaw(){
        return $this->meta;
    }

    /**
     * Set (override) the entire meta with an unmodified string.
     *
     * @param string $serialized
     *
     * @return void
     */
    public function writeRaw( $serialized ){
        $this->meta = $serialized;
        $this->save();
    }

    /**
     * Get the universal identifier of the model.
     *
     * @return \Ramsey\Uuid\Uuid
     */
    public function getUUID(){
        return $this->uuid;
    }

    /**
     * Set the universal identifier of the model (can only be set once).
     *
     * @return void
     */
    public function setUuid(){
        if( is_null($this->uuid) || $this->uuid === "" ){
            $this->uuid = Uuid::uuid4();
        }
    }

    /**
     * Ask if the model has a universal identifier.
     *
     * @return bool
     */
    public function hasUuid(){
        return ( isset($this->uuid) && $this->uuid !== "" );
    }

    /**
     * Set the universal identifier via existing UUID.
     *
     * @param \Ramsey\Uuid\Uuid $uuid
     *
     * @return void
     */
    public function setRawUuid( Uuid $uuid ){
        $this->uuid = $uuid;
        $this->save();
    }

    /**
     * Add the UUID and Meta columns to the table.
     * 
     * @param \Illuminate\Database\Schema\Blueprint
     *
     * @return void
     */
    public static function formTable( Blueprint $table ){
        $table->uuid('uuid');
        $table->text('meta');
    }

    public static function route(){}
}