<?php
require_once DOL_DOCUMENT_ROOT.'/custom/bbus/class/mnbexchangerate.class.php';
require_once DOL_DOCUMENT_ROOT.'/multicurrency/class/multicurrency.class.php';
class ExchangeRateUpdater
{
    const EUR = 'EUR';
    public $db;
    public $entities = [];
    public $errors;
    /**
     * 
     */
    public function __construct()
    {
        global $db;

        $this->db = $db;
    }
    /**
     * 
     */
    public function loadRateFromBank(string $currency): float
    {
        return (new MnbExchangeRate)->currencyExchangeRate($currency);
    }
    /**
     * 
     */
    public function updateRate(): bool
    {
        $success = true;
        $this->errors = [];

        $eur = 1/$this->loadRateFromBank(self::EUR);

        $this->loadEntities();
        if (!empty($this->entities)) {
            foreach ($this->entities as $entity) {
                if ($this->updateEntity(self::EUR, $eur, $entity) === false) {
                    $success = false;
                }
            }
        }        

        return $success;
    }
    /**
     * 
     */
    private function updateEntity(string $currency, float $rate, DaoMulticompany $entity): bool
    {
        $result = false;
        $multiCurrencyId = $this->getIdFromCode($currency, $entity->id);

        $currencyRate = new CurrencyRate($this->db);
        $currencyRate->fk_multicurrency = $multiCurrencyId;		
        $currencyRate->entity = $entity->id;
		$currencyRate->date_sync = date('Y-m-d H:i:s');
		$currencyRate->rate = $rate;

		$result = $currencyRate->create(intval($multiCurrencyId));
		if ($result > 0) {
			$result = true;
		} else {
            $this->errors[] = $currency.' entity: '.$entity->label.' ('.$entity->id.')';
			dol_syslog("currencyRate:createRate", LOG_WARNING);
		}

        return $result;
    }
    /**
     * 
     */
    public function loadEntities(): void
    {
        $entityDao = (new DaoMulticompany($this->db));
		$entityDao->getEntities(false, [], true);
        $this->entities = $entityDao->entities;
    }
    /**
    * Get id of currency from code
    *
    * @param  string	$code	    code value search
    * @param  int   	$entity	    entity value search
    *
    * @return int                 0 if not found, >0 if OK
    */
    public function getIdFromCode($code, $entity): int
    {
        $id = 0;
        $sql = "SELECT rowid FROM ".MAIN_DB_PREFIX."multicurrency WHERE code = '".$this->db->escape($code)."' AND entity = ".$entity;

        dol_syslog(__METHOD__, LOG_DEBUG);
        $resql = $this->db->query($sql);
        if ($resql && $obj = $this->db->fetch_object($resql)) {
            $id = $obj->rowid;
        }

        return $id;
    }
    /**
     * 
     */
    public static function getExchangeRate(string $currency, int $entity): array
    {
        global $db;

        $result = [];

        $sql = "
            SELECT ROUND(1/cr.rate, 2) AS \"{$currency}\", cr.date_sync AS last_update
            FROM ".MAIN_DB_PREFIX."multicurrency AS c
            LEFT JOIN ".MAIN_DB_PREFIX."multicurrency_rate AS cr ON cr.fk_multicurrency=c.rowid
            WHERE c.code ILIKE '{$currency}'
            AND cr.entity={$entity}
            ORDER BY cr.date_sync DESC 
            LIMIT 1
        ";

        $row = $db->query($sql);
        if ($row) {
            $obj = $db->fetch_object($row);
            $result = (array)$obj;
            $result[$currency] = (float)$result[$currency];
        }
        
        return $result;
    }

}