<?php

namespace ModulesGarden\Servers\ProxmoxVps\Core\UI\Widget\DataTable\DataProviders;

use ModulesGarden\Servers\ProxmoxVps\Core\Http\Request;

/**
 *
 */
abstract class DataProvider
{
    const FILTR_BY_DATE           = '\ModulesGarden\Servers\ProxmoxVps\Core\UI\Widget\DataTable\Filters\Date';
    const FILTR_BY_RAGE           = '\ModulesGarden\Servers\ProxmoxVps\Core\UI\Widget\DataTable\Filters\Rage';
    const FILTR_BY_RAGE_DATE      = '\ModulesGarden\Servers\ProxmoxVps\Core\UI\Widget\DataTable\Filters\RageDate';
    const FILTR_BY_SELECT         = '\ModulesGarden\Servers\ProxmoxVps\Core\UI\Widget\DataTable\Filters\Select';
    const FILTR_BY_TEXT           = '\ModulesGarden\Servers\ProxmoxVps\Core\UI\Widget\DataTable\Filters\Text';
    const FILTR_BY_YESNO          = '\ModulesGarden\Servers\ProxmoxVps\Core\UI\Widget\DataTable\Filters\YesNo';
    const SORT_ASC                = 'ASC';
    const SORT_DESC               = 'DESC';
    protected $limit        = 10;
    protected $offset       = 0;
    protected $data         = null;
    protected $orderColumn  = null;
    protected $orderDir     = null;
    protected $request      = null;
    protected $avalibleCols = null;
    protected $filter       = [];
    protected $records      = [];
    protected $filterFields = [];
    protected $toSearch     = null;
    private $response;
    protected $customSearch = false;

    protected $defaultOrderColumn = null;
    protected $defaultOrderDir = null;
    
    public function __construct()
    {
        $this->request  = Request::build();
        $this->response = new DataSet();
        $this->loadLimits();
        $this->loadSortings();
        $this->loadFilter();
        $this->loadSearch();
    }

    protected function loadLimits()
    {
        if ($this->request->query->get('iDisplayLength'))
        {
            $this->setLimit((int) $this->request->query->get('iDisplayLength'));
        }

        if ($this->request->query->get('iDisplayStart'))
        {
            $this->setOfset((int) $this->request->query->get('iDisplayStart'));
        }
    }

    protected function loadSortings()
    {
        if ($this->request->query->get('iSortCol_0') && $this->request->query->get('sSortDir_0'))
        {
            $this->setSortBy($this->request->query->get('iSortCol_0'));
            $this->setSortDir($this->request->query->get('sSortDir_0'));
        }
    }

    protected function loadSearch()
    {
        if ($this->request->query->get('sSearch'))
        {
            $this->setSearch(html_entity_decode($this->request->query->get('sSearch'), ENT_QUOTES));
        }
    }

    protected function loadFilter()
    {
        $filters = $this->request->query->get('filter', []);

        foreach ($filters as $filter)
        {
            $this->addFilter($filter['name'], $filter['data']);
        }

        return $this;
    }

    protected function addFilter($key, $data = null)
    {
        if (isset($data))
        {
            array_set($this->filter, $key, $data);
        }

        return $this;
    }

    public function setLimit($limit)
    {
        $this->limit = (int) $limit;
    }

    public function setSearch($toSearch)
    {
        $this->toSearch = $toSearch;
    }
    
    protected function useSearch($data = [])
    {
        if ($this->toSearch && str_replace(" ", "", $this->toSearch) != ''  && $this->customSearch === false)
        {
            $searchable = [];
            foreach ($this->avalibleCols as $column)
            {
                if ($column->searchable === true)
                {
                    $searchable[] = $column->name;
                }
            }

            $removeIds = [];
            foreach ($data as $id => $record)
            {
                $isFind = false;
                foreach ($record as $fieldKey => $fieldData)
                {
                    if (strpos(strtolower(str_replace(" ", "", $fieldData)),
                        strtolower(str_replace(" ", "", $this->toSearch))) !== false
                        && in_array($fieldKey, $searchable))
                    {
                        $isFind = true;
                        break;
                    }
                }
                
                if ($isFind === false)
                {
                    $removeIds[] = $id;
                }
            }

            if (is_object($data))
            {
                foreach ($removeIds as $id)
                {
                    unset($data->$id);
                }
            }
            else
            {
                foreach ($removeIds as $id)
                {
                    unset($data[$id]);
                }
            }
            
        }
        
        return $data;
    }

    public function setOfset($offset)
    {
        $this->offset = (int) $offset;
    }

    public function setData($data, array $params = [])
    {
        $this->data = $data;
        
        return $this;
    }

    public function setSortBy($colName)
    {
        $this->orderColumn = $colName;
    }

    public function setSortDir($sortDir)
    {
        $this->orderDir = $sortDir;
    }

    public function getData(array $avalibleCols = [])
    {
        $this->avalibleCols             = $avalibleCols;

        $this->data = $this->useSearch($this->data);

        $this->records                  = $this->data;
        $this->response->fullDataLenght = count($this->records);

        //$this->useFilter(); //<- todo
        $this->sortData();
        $this->addLimit($this->records);
        $this->response->offset  = $this->offset;
        $this->response->records = $this->records;

        return $this->response;
    }

    protected function sortData()
    {
        if ($this->orderColumn && $this->orderDir && $this->avalibleCols[$this->orderColumn])
        {
            $column = $this->avalibleCols[$this->orderColumn];
            $this->sortNow($this->orderColumn, $column->type, strtolower($this->orderDir) === strtolower(DataProvider::SORT_ASC));
        }
    }

    protected function addLimit(&$data)
    {
        $data = array_slice($data, $this->offset, $this->limit);
    }

    protected function useSort()
    {
        foreach ($this->sort as $field => $sort)
        {
            $this->sortNow($field, $this->getType($field), strtolower($sort) === strtolower(DataProvider::SORT_ASC));
        }

        return $this;
    }

    protected function sortNow($fieldName, $type, $asc)
    {
        if ($type == 'string')
        {
            usort($this->records, function (array $a, array $b) use ($fieldName, $asc)
            {
                if ($asc)
                {
                    return strnatcmp(strtolower($a[$fieldName]), strtolower($b[$fieldName]));
                }

                return strnatcmp(strtolower($b[$fieldName]), strtolower($a[$fieldName]));
            });
        }
        elseif ($type == 'int')
        {
            usort($this->records, function (array $a, array $b) use (&$fieldName, &$asc)
            {
                if ($a[$fieldName] == $b[$fieldName])
                {
                    $return = 0;
                }
                elseif ($a[$fieldName] != $b[$fieldName] && $asc)
                {
                    $return = ($a[$fieldName] < $b[$fieldName]) ? -1 : 1;
                }
                else
                {
                    $return = ($a[$fieldName] > $b[$fieldName]) ? -1 : 1;
                }
                return $return;
            });
        }
        elseif ($type == 'date')
        {
            usort($this->records, function (array $a, array $b) use (&$fieldName, &$asc)
            {
                $a = $a[$fieldName];
                if (!is_numeric($a))
                    $a = strtotime($a);

                $b = $b[$fieldName];
                if (!is_numeric($b))
                    $b = strtotime($b);

                $return = $asc ? 1 : -1;
                if ($a == $b) {
                    return 0;
                }
                return $a > $b ? $return : -$return;
            });
        }
        else
        {
            foreach ($this->sortFunction as $typeCallBack => $callback)
            {
                if ($typeCallBack == $type)
                {
                    usort($this->records, $callback);
                }
            }
        }
    }

    protected function addSortFunction($type, $callback)
    {
        array_set($this->sortFunction, $type, $callback);
        return $this;
    }

    private function setType($field, $type = self::TYPE_STRING)
    {
        array_set($this->type, $field, $type);
        return $this;
    }

    protected function getType($field)
    {
        if (array_key_exists($field, $this->type))
        {
            return $this->type[$field];
        }
        return 'string';
    }

    private function addFilterField($field, $class = self::FILTR_BY_TEXT)
    {
        array_set($this->filterFields, $field, $class);
        return $this;
    }

    protected function useFilter()
    {
        foreach ($this->filter as $field => $value)
        {
            if (isset($this->filterFields[$field]))
            {
                $class = $this->filterFields[$field];
                $this->setData($class::create($this->getRecords(), $field, $value));
            }
            else
            {
                $this->setData(Filters\Text::create($this->getRecords(), $field, $value));
            }
        }
        return $this;
    }
    
    public function setDefaultSorting($column, $direction)
    {
        if (!$this->request->query->get('iSortCol_0') && !$this->request->query->get('sSortDir_0'))
        {
            $this->setSortBy($column);
            $this->setSortDir($direction);
        }

        return $this;
    }

    public function enableCustomSearch()
    {
        $this->customSearch = true;
    }
}