<?php

namespace app\components\filterBuilder;

use Exception;
use yii\db\ActiveQueryInterface;

class FilterBuilder
{
    const IN = 'in';
    const BETWEEN = 'between';
    const BETWEEN_FLOAT = 'between-float';
    const EQUAL = 'eq';
    const NOT_EQUAL = 'neq';

    private $filtersMap = [
        self::IN => ProcessIn::class,
        self::BETWEEN => ProcessBetween::class,
        self::EQUAL => ProcessEqual::class,
        self::NOT_EQUAL => ProcessNotEqual::class,
        self::BETWEEN_FLOAT => ProcessBetweenFloat::class
    ];

    /**
     * @var ActiveQueryInterface
     */
    private $query;

    /**
     * @var array
     */
    private $filters;

    public function __construct(ActiveQueryInterface $query, array $filters)
    {
        $this->query = $query;
        $this->filters = $filters;
    }

    public function build(array $params)
    {
        foreach ($params as $field => $type) {
            if (!in_array($type, array_keys($this->filtersMap))) {
                throw new Exception('O tipo de filtro "' . $type . '" não existe.');
            }

            if (!class_exists($this->filtersMap[$type])) {
                throw new Exception('Implementação do filtro "' . $type . '" não existe.');
            }

            if (!isset($this->filters[$field])) {
                continue;
            }

            if (empty($this->filters[$field]) || is_null($this->filters[$field])) {
                continue;
            }

            /** @var FilterBuilderProcessInterface $process */
            $process = new $this->filtersMap[$type];

            $this->query = $process->processQuery($this->query, $field, $this->filters[$field]);
        }

        return $this->query->all();
    }

    public function addFilterProcess(string $name, string $className)
    {
        $this->filtersMap[$name] = $className;
    }
}