<?php

namespace ByJG\AnyDataset\Core;

use ByJG\AnyDataset\Core\Enum\Relation;

class IteratorFilter
{
	/** @var array */
	private $filters;


	/**
	 * IteratorFilter Constructor
	 */
	public function __construct()
	{
		$this->filters = [];
	}


	/**
	 * @return IteratorFilter
	 */
	public static function getInstance()
	{
		return new IteratorFilter();
	}


	/**
	 * @param array $array
	 * @return Row[]
	 */
	public function match($array)
	{
		$returnArray = [];

		foreach ($array as $sr) {
		    if ($this->evalString($sr)) {
		        $returnArray[] = $sr;
		    }
		}

		return $returnArray;
	}


	/**
	 * Get the filter
	 *
	 * @param IteratorFilterFormatter $formatter
	 * @param string $tableName
	 * @param array $params
	 * @param string $returnFields
	 * @return string
	 */
	public function format(IteratorFilterFormatter $formatter, $tableName = null, &$params = [], $returnFields = "*")
	{
		return $formatter->format($this->filters, $tableName, $params, $returnFields);
	}


	/**
	 * @param Row $singleRow
	 * @return bool
	 */
	private function evalString(Row $singleRow)
	{
		$result = [];
		$finalResult = false;
		$pos = 0;

		$result[0] = true;

		foreach ($this->filters as $filter) {
		    if (($filter[0] == ")") || ($filter[0] == " or ")) {
		        $finalResult = $finalResult || $result[$pos];
		        $result[++$pos] = true;
		    }

		    $name = $filter[1];
		    $relation = $filter[2];
		    $value = $filter[3];

		    $field = [$singleRow->get($name)];

		    foreach ($field as $valueparam) {
		        switch ($relation) {
		            case Relation::EQUAL:
		                $result[$pos] = $result[$pos] && ($valueparam == $value);
		                break;

		            case Relation::GREATER_THAN:
		                $result[$pos] = $result[$pos] && ($valueparam > $value);
		                break;

		            case Relation::LESS_THAN:
		                $result[$pos] = $result[$pos] && ($valueparam < $value);
		                break;

		            case Relation::GREATER_OR_EQUAL_THAN:
		                $result[$pos] = $result[$pos] && ($valueparam >= $value);
		                break;

		            case Relation::LESS_OR_EQUAL_THAN:
		                $result[$pos] = $result[$pos] && ($valueparam <= $value);
		                break;

		            case Relation::NOT_EQUAL:
		                $result[$pos] = $result[$pos] && ($valueparam != $value);
		                break;

		            case Relation::STARTS_WITH:
		                $result[$pos] = $result[$pos] && (strpos(is_null($valueparam) ? "" : $valueparam, $value) === 0);
		                break;

		            default: // Relation::CONTAINS:
		                $result[$pos] = $result[$pos] && (strpos(is_null($valueparam) ? "" : $valueparam, $value) !== false);
		                break;
		        }
		    }
		}

		$finalResult = $finalResult || $result[$pos];

		return $finalResult;
	}


	/**
	 * @param string $name Field name
	 * @param int $relation Relation enum
	 * @param string $value Field string value
	 * @return IteratorFilter
	 * @desc Add a single string comparison to filter.
	 */
	public function addRelation($name, $relation, $value)
	{
		$this->filters[] = [" and ", $name, $relation, $value];
		return $this;
	}


	/**
	 * @param string $name Field name
	 * @param int $relation Relation enum
	 * @param string $value Field string value
	 * @return IteratorFilter
	 * @desc Add a single string comparison to filter. This comparison use the OR operator.
	 */
	public function addRelationOr($name, $relation, $value)
	{
		$this->filters[] = [" or ", $name, $relation, $value];
		return $this;
	}


	/**
	 * Add a "("
	 * @return IteratorFilter
	 */
	public function startGroup()
	{
		$this->filters[] = ["(", "", "", ""];
		return $this;
	}


	/**
	 * Add a ")"
	 * @return IteratorFilter
	 */
	public function endGroup()
	{
		$this->filters[] = [")", "", "", ""];
		return $this;
	}


	/**
	 * @return array
	 */
	public function getRawFilters()
	{
		return $this->filters;
	}
}
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