<?php

namespace App\Knockout;

use Illuminate\Http\Request;

class Dataset
{

    private $records = [];

    private $totalRecords = null;
    private $currentPage = null;
    private $recordsPerPage = null;

    public function __serialize(): array
    {
        return [
            'records' => $this->records,
            'totalRecords' => $this->totalRecords,
            'currentPage' => $this->currentPage,
            'recordsPerPage' => $this->recordsPerPage
        ];
    }

    public function __unserialize(array $data): void
    {
        $this->records          = $data['records'] ?? [];
        $this->totalRecords     = $data['totalRecords'] ?? null;
        $this->currentPage      = $data['currentPage'] ?? null;
        $this->recordsPerPage   = $data['recordsPerPage'] ?? null;
    }

    public function __construct($records)
    {
        if (!is_array($records)) $records = [$records];
        $this->records = $records;
    }

    public function setTotalRecords(int $total)
    {
        $this->totalRecords = $total;
        return $this;
    }

    public function setCurrentPage(int $page)
    {
        $this->currentPage = $page;
        return $this;
    }

    public function setRecordsPerPage(int $count)
    {
        $this->recordsPerPage = $count;
        return $this;
    }

    public function getRecords()
    {
        return $this->records;
    }

    public function getRecord()
    {
        return $this->records[0] ?? null;
    }

    private function getPageCount()
    {
        $exactPages = ($this->totalRecords / $this->recordsPerPage);
        $pages = ceil($exactPages);
        $pages = ($pages == $exactPages) ? floor($exactPages) : $pages;
        return ($pages < 1) ? 1 : $pages;
    }

    private function queryParams(array $query)
    {
        $output = [];
        foreach ($query as $key => $item) {
            $output[] = sprintf('%s=%s', $key, urlencode($item));
        }
        return '?' . implode('&', $output);
    }

    public function getPaginator(Request $request)
    {
        if (is_null($this->totalRecords)) return null;
        if (is_null($this->currentPage)) return null;
        if (is_null($this->recordsPerPage)) return null;

        $route = $request->route();
        $query = $request->query();
        $alias = $route[1]['as'] ?? 'index';
        $params = $route[2] ?? [];

        $pages = array_map(function($page) use($alias, $params, $query) {
            $currentPage = $params['page'] ?? 1;
            return (object) [
                'number' => $page,
                'active' => ($page == $currentPage),
                'link' => route($alias, array_merge($params, ['page' => $page])) //. $this->queryParams($query)
            ];
        }, range(1, $this->getPageCount()));

        return view('partial/paginator', [
            'pages' => $pages
        ]);
    }

}