<?php

namespace kernel\IGTabel;

use app\helpers\Debug;
use Exception;
use Illuminate\Database\Eloquent\Model;

class EloquentDataProvider
{
    protected int $totalCount;

    protected int $perPage = 10;

    protected int $currentPage = 1;

    protected Model $model;

    protected $queryBuilder = false;

    protected array $options = [];
    protected array $meta = [];
    protected string $jsonStr = '';

    /**
     * @throws Exception
     */
    public function __construct($source, array $options)
    {
        if (is_string($source)) {
            $this->queryBuilder = $source::query();
            $model = new $source();
        } elseif (is_object($source)) {
            $this->queryBuilder = $source;
            $model = $source->getModel();
        } else {
            throw new Exception(message: "source is not valid");
        }
        $this->options = $options;
        $this->currentPage = $this->options['currentPage'] ?? 1;
        $this->perPage = $this->options['perPage'] ?? 10;
        $this->meta['total'] = $model->count();
        $this->meta['totalWithFilters'] = $this->queryBuilder->count();
        $this->meta['columns'] = $options['columns'] ?? $model->labels();
        $this->meta['perPage'] = $options['perPage'] ?? 10;
        $this->meta['currentPage'] = $options['currentPage'] ?? 1;
        $this->meta['baseUrl'] = $options['baseUrl'] ?? $model->table;
        $this->meta['params'] = $options['params'] ?? [];
        $this->meta['actions'] = $options['actions'] ?? [];
        $this->createQuery();

        $this->jsonStr = (new JSONCreator($this->meta, $this->getCollection()->toArray()))->getJson();

    }

    public function createQuery(): void
    {
        if ($this->currentPage > 1) {
            $this->queryBuilder->skip(($this->currentPage - 1) * $this->perPage)->take($this->perPage);
        } else {
            $this->queryBuilder->take($this->perPage);
        }
    }

    public function getCollection()
    {
        return $this->queryBuilder->get();
    }

    /**
     * @return string|null
     */
    public function getJson(): string|null
    {
        return $this->jsonStr;
    }

}