<?php
namespace App\Library;
use NilPortugues\Sql\QueryBuilder\Builder\GenericBuilder;

final class ContingentManager
{
    private static ?ContingentManager $instance;
    private ?GenericBuilder $builder;
    private function __construct()
    {
        $this->builder = new GenericBuilder();
    }

    public static function getInstance() : ContingentManager
    {
        self::$instance ??= new self();
        return self::$instance;
    }

    public function getSites(Database $db): array
    {
        // select kod as org_id, site from niimko.s_vuzes
        // where ootype = 'vuz' and deleted = 'n' and fake = 'n'
        $params = ['vuz', 'n', 'n', 'RU'];
        $query = $this->builder->select()
            ->setTable('s_vuzes')
            ->setColumns(['org_id' => 'kod', 'site'])
            ->where('AND')
            ->equals('ootype', 'vuz')
            ->equals('deleted', 'n')
            ->equals('fake', 'n')
            ->equals('country', 'RU')
            ->end();
        $sql = $this->builder->write($query);
        $sites = $db->selectQuery($sql, $params);
        
        return $sites;
    }

    public function insertContingent(Database $db, array $contingent) : void
    {
        $params = ['spec_code', 'spec_name', 'edu_level', 'edu_forms', 'contingent', 'spec_id', 'org_id'];
        $sql = "insert into sveden_education_contingent"
            ."(". implode(',', $params) .") values";
        for ($i = 0; $i < count($contingent); $i++) {
            $sql .= "(";
            foreach ($contingent[$i] as $key => $value) {
                $sql .= ":$key". ($i+1).",";
            }
            $sql = substr_replace($sql,"),", -1);
        }
        $sql = substr_replace($sql,"", -1);
        
        $db->insertQuery($sql, $contingent);
    }

    public function getSpecializations(Database $db) : array
    {
        // select id, kod from niimko.s_specs where oopkodes = 'gos3p'
        $params = ['gos3p'];
        $query = $this->builder->select()
            ->setTable('s_specs')
            ->setColumns(['id', 'kod'])
            ->where()
            ->equals('oopkodes','gos3p')
            ->end();
        $sql = $this->builder->write($query);
        $specializations = $db->selectQuery($sql, $params);
        
        return $specializations;
    }

    public function buildURL(string $url): string
    {
        // Строит -> https://<base_uri>/sveden/education/
        $offset = strpos($url, '/', strlen('http://'));
        if ($offset) {
            $url = substr_replace($url, '', $offset);
        }
        
        $url = "$url/sveden/education/";
        if (str_contains($url, "http://")) {
            $url = str_replace("http://","https://", $url);
        } else {
            $url = "https://$url";
        }
        $url = str_replace("www.","", $url);

        return $url;
    }

    public function addSpecId(array &$contingent, array $specializations) : void
    {
        foreach ($contingent as $key => $con) {
            $buf = null;
            $needle = $con['spec_code'];
            foreach ($specializations as $spec) {
                if ($needle == $spec['kod']) {
                    $buf = $spec['id'];
                }
            }
            $contingent[$key]['spec_id'] = $buf;
            unset($buf);
        }
    }

    public function addOrgId(array &$contingent, int $orgId) : void
    {
        for($i = 0; $i < count($contingent); $i++) {
            $contingent[$i]['org_id'] = $orgId;
        }
    }

    public function checkContingent(array $contingent) : bool
    {
        $count = 0;
        foreach ($contingent as $value) {
            $count += $value['contingent'];
        }
        return $count ? true : false;
    }
}