<?php

namespace Stimulsoft\Adapters;

use DateTime;
use Exception;
use Stimulsoft\Enums\StiDatabaseType;
use Stimulsoft\Events\StiConnectionEventArgs;
use Stimulsoft\StiDataResult;

class StiOracleAdapter extends StiSqlAdapter
{

### Constants

    const DriverNotFound = 'Oracle driver not found. Please configure your PHP server to work with Oracle.';


### Properties

    /** @var string Current version of the data adapter. */
    public $version = '2026.1.2';

    /** @var bool Sets the version matching check on the server and client sides. */
    public $checkVersion = true;

    protected $type = StiDatabaseType::Oracle;
    protected $driverName = 'oci';


### Methods

    protected function getLastErrorResult(): StiDataResult
    {
        if ($this->driverType == 'PDO')
            return parent::getLastErrorResult();

        $code = 0;
        $error = oci_error();
        if ($error !== false) {
            $code = $error['code'];
            $error = $error['message'];
        }

        $message = $error ?: self::UnknownError;
        if ($code != 0) $message = "[$code] $message";

        return StiDataResult::getError($message)->getDataAdapterResult($this);
    }

    protected function connect(): StiDataResult
    {
        if ($this->driverType == 'PDO')
            return parent::connect();

        if (!function_exists('oci_connect'))
            return StiDataResult::getError(self::DriverNotFound)->getDataAdapterResult($this);

        $args = new StiConnectionEventArgs($this->handler->request, $this->type, $this->driverName, $this->connectionInfo);
        $this->handler->onDatabaseConnect->call($args);

        if ($args->link !== null)
            $this->connectionLink = $args->link;
        else if ($this->connectionInfo->privilege == '')
            $this->connectionLink = oci_connect(
                $this->connectionInfo->userId, $this->connectionInfo->password, $this->connectionInfo->database,
                $this->connectionInfo->charset);
        else
            $this->connectionLink = oci_pconnect(
                $this->connectionInfo->userId, $this->connectionInfo->password, $this->connectionInfo->database,
                $this->connectionInfo->charset, $this->connectionInfo->privilege);

        if (!$this->connectionLink)
            return $this->getLastErrorResult();

        return StiDataResult::getSuccess()->getDataAdapterResult($this);
    }

    protected function disconnect()
    {
        if ($this->driverType == 'PDO')
            parent::disconnect();
        else if ($this->connectionLink) {
            oci_close($this->connectionLink);
            $this->connectionLink = null;
        }
    }

    public function process(): bool
    {
        if (parent::process()) return true;

        $this->connectionInfo->port = 3306;
        $this->connectionInfo->charset = 'AL32UTF8';

        $parameterNames = array(
            'database' => ['database', 'data source', 'dbname'],
            'userId' => ['uid', 'user', 'user id'],
            'password' => ['pwd', 'password'],
            'charset' => ['charset']
        );

        return $this->processParameters($parameterNames);
    }

    protected function processUnknownParameter($parameter, $name, $value)
    {
        parent::processUnknownParameter($parameter, $name, $value);

        if ($name == 'dba privilege' || $name == 'privilege') {
            $value = strtolower($value);
            $this->connectionInfo->privilege = OCI_DEFAULT;
            if ($value == 'sysoper' || $value == 'oci_sysoper') $this->connectionInfo->privilege = OCI_SYSOPER;
            if ($value == 'sysdba' || $value == 'oci_sysdba') $this->connectionInfo->privilege = OCI_SYSDBA;
        }
    }

    protected function getType($meta, $extended = false): string
    {
        switch ($meta) {
            case 'SMALLINT':
            case 'INTEGER':
            case 'BIGINT':
                return 'int';

            case 'NUMBER':
                return 'number';

            case 'DATE':
            case 'TIMESTAMP':
                return 'datetime';

            case 'CHAR':
            case 'VARCHAR2':
            case 'INTERVAL DAY TO SECOND':
            case 'INTERVAL YEAR TO MONTH':
            case 'ROWID':
                return 'string';

            case 'BFILE':
            case 'BLOB':
                return $extended ? 'blob' : 'array';

            case 'LONG':
            case 'CLOB':
                return $extended ? 'clob' : 'string';

            case 'RAW':
            case 100:
            case 101:
                return 'array';
        }

        return 'string';
    }

    protected function getValue($type, $value)
    {
        if (is_null($value))
            return null;

        if ($type == 'blob' || $type == 'clob') {
            try {
                $data = $value->load();
                return $type == 'blob' ? base64_encode($data) : $data . "\n";
            }
            catch (Exception $e) {
                return null;
            }
        }

        if (strlen($value) == 0)
            return null;

        switch ($type) {
            case 'array':
                return base64_encode($value);

            case 'datetime':
                $dateTime = DateTime::createFromFormat("d#M#y H#i#s*A", $value);
                if ($dateTime !== false)
                    $format = $dateTime->format("Y-m-d\TH:i:s.v");
                else {
                    $timestamp = strtotime($value);
                    $format = date("Y-m-d\TH:i:s.v", $timestamp);
                    if (strpos($format, '.v') > 0)
                        $format = date("Y-m-d\TH:i:s.000", $timestamp);
                }
                return $format;
        }

        return $value;
    }

    public function makeQuery($procedure, $parameters): string
    {
        $paramsString = parent::makeQuery($procedure, $parameters);
        return "SQLEXEC 'CALL $procedure ($paramsString)'";
    }

    protected function executeNative($queryString, $maxDataRows, $result): StiDataResult
    {
        $query = oci_parse($this->connectionLink, $queryString);
        if (!$query || !oci_execute($query))
            return $this->getLastErrorResult();

        $result->count = oci_num_fields($query);
        $types = [];

        for ($i = 1; $i <= $result->count; $i++) {
            $name = oci_field_name($query, $i);
            $result->columns[] = $name;

            $type = oci_field_type($query, $i);
            $result->types[] = $this->getType($type);
            $types[] = $this->getType($type, true);
        }

        while ($rowItem = oci_fetch_assoc($query)) {
            $row = [];

            foreach ($rowItem as $key => $value) {
                if (count($result->columns) < count($rowItem)) $result->columns[] = $key;
                $type = $types[count($row)];
                $row[] = $this->getValue($type, $value);
            }

            $result->rows[] = $row;

            if (count($result->rows) === $maxDataRows)
                break;
        }

        return $result;
    }

    protected function executePDO($queryString, $maxDataRows, $result): StiDataResult
    {
        // PDO Oracle driver doesn't support getColumnMeta()
        // The type is determined by the first value

        return $this->executePDOv2($queryString, $maxDataRows, $result);
    }
}