<?php

namespace Ulmus\Adapter;

use Ulmus\Pdo;

use Ulmus\Exception\AdapterConfigurationException;

use Ulmus\Ulmus;

use Ulmus\Migration\FieldDefinition;
use Ulmus\{ConnectionAdapter,
    Entity\InformationSchema\Table,
    Migration\MigrateInterface,
    Migration\SqlMigrationTrait,
    Repository,
    QueryBuilder};

class MsSQL implements AdapterInterface, MigrateInterface, SqlAdapterInterface {
    use SqlAdapterTrait, SqlMigrationTrait;

    const ALLOWED_ATTRIBUTES = [
        'default', 'primary_key', 'auto_increment',
    ];

    const DSN_PREFIX = "sqlsrv";

    public int $port;
    
    public int $transactionIsolation;
    
    public int $connectionPooling = 0;
    
    public bool $encrypt;

    public bool $multipleActiveResultSets;

    public bool $traceOn;
    
    public string $app;
    
    public string $server;
    
    public string $database;
    
    public string $username;

    public string $password;
    
    public string $traceFile;
    
    public string $failoverPartner;
    
    public string $wsid;
    
    public function __construct(
        ?string $server = null,
        ?string $database = null,
        #[\SensitiveParameter]
        ?string $username = null,
        #[\SensitiveParameter]
        ?string $password = null,
        ?int $port = null
    ) {
        if ($server) {
            $this->server = $server;
        }

        if ($database) {
            $this->database = $database;
        }

        if ($port) {
            $this->port = $port;
        }

        if ($username) {
            $this->username = $username;
        }

        if ($password) {
            $this->password = $password;
        }
    }

    public function connect() : Pdo
    {
        try {
            $pdo = new Pdo\Mssql($this->buildDataSourceName(), $this->username, $this->password);
            $pdo->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
            $pdo->setAttribute(\PDO::ATTR_DEFAULT_FETCH_MODE, \PDO::FETCH_ASSOC);
            $pdo->setAttribute(\PDO::SQLSRV_ATTR_ENCODING, \PDO::SQLSRV_ENCODING_UTF8);
        }
        catch(\PDOException $ex){
            throw $ex;
        }
        finally {
            $this->password = str_repeat('*', random_int(8,16));
        }

        return $pdo;
    }

    public function buildDataSourceName() : string
    {
        $parts[] = "Server={$this->server}" . ( isset($this->port) ? ",{$this->port}" : "" );
        $parts[] = "Database={$this->database}";
        $parts[] = "ConnectionPooling={$this->connectionPooling}";

        if ( $this->app ?? false ) {
            $parts[] = "APP={$this->app}";
        }

        if ( $this->encrypt ?? false ) {
            $parts[] = "Encrypt=1";
        }
        else {
            $parts[] = "Encrypt=0";
        }
        
	    if ( $this->failoverPartner ?? false ) {
            $parts[] = "Failover_Partner={$this->failoverPartner}";
        }
        
        if ( $this->loginTimeout ?? false ) {
            $parts[] = "LoginTimeout={$this->loginTimeout}";
        }
        
        if ( $this->multipleActiveResultSets ?? false ) {
            $parts[] = "MultipleActiveResultSets=1";
        }
        
        if ( $this->quotedId ?? false ) {
            $parts[] = "QuotedId=1";
        }
        
        if ( $this->traceFile ?? false ) {
            $parts[] = "TraceFile={$this->traceFile}";
        }
        
        if ( $this->traceOn ?? false ) {
            $parts[] = "TraceOn=1";
        }
        
        if ( $this->transactionIsolation ?? false ) {
            $parts[] = "TransactionIsolation={$this->transactionIsolation}";
        }
        
        if ( $this->trustServerCertificate ?? false ) {
            $parts[] = "TrustServerCertificate=yes";
        }
        
        if ( $this->WSID ?? false ) {
            $parts[] = "WSID={$this->wsid}";
        }
        
        return static::DSN_PREFIX . ":" . implode(';', $parts);
    }
    
    public function setup(array $configuration) : void
    {
        $configuration = array_change_key_case($configuration, \CASE_LOWER);
     
        if ( false === ( $this->server = $configuration['server'] ?? false ) ) {
            throw new AdapterConfigurationException("Your `server` setting is missing. It is a mandatory parameter for this driver.");
        }
        elseif ( false === ( $this->database = $configuration['database'] ?? false ) ) {
            throw new AdapterConfigurationException("Your `database` setting is missing. The adapter won't connect without it.");
        }
        elseif ( false === ( $this->username = $configuration['username'] ?? false ) ) {
            throw new AdapterConfigurationException("Your `username` is missing from your configuration array");
        }
        elseif ( false === ( $this->password = $configuration['password'] ?? false ) ) {
            throw new AdapterConfigurationException("Your `password` is missing from your configuration array");
        }
        
        if ( false !== ( $configuration['app'] ?? false ) ) {
            $this->app = $configuration['app'];
        }
        
        if ( false !== ( $configuration['port'] ?? false ) ) {
            $this->port = $configuration['port'];
        }
        
        if ( false !== ( $configuration['failover_partner'] ?? false ) ) {
            $this->failoverPartner = $configuration['failover_partner'];
        }
        
        if ( false !== ( $configuration['wsid'] ?? false ) ) {
            $this->wsid = $configuration['wsid'];
        }
        
        if ( false !== ( $configuration['transaction_isolation'] ?? false ) ) {
            $this->transactionIsolation = $configuration['transaction_isolation'];
        }
        
        if ( false !== ( $configuration['connection_pooling'] ?? false ) ) {
            $this->connectionPooling = $configuration['connection_pooling'];
        }
        
        if ( false !== ( $configuration['encrypt'] ?? false ) ) {
            $this->encrypt = $configuration['encrypt'];
        }
        
        if ( false !== ( $configuration['multiple_active_result_sets'] ?? false ) ) {
            $this->multipleActiveResultSets = $configuration['multiple_active_result_sets'];
        }
        
        if ( false !== ( $configuration['trace_on'] ?? false ) ) {
            $this->traceOn = $configuration['trace_on'];
        }
    }

    public function mapFieldType(FieldDefinition $field, bool $typeOnly = false) : string
    {
        $mapper = new MsSQLFieldMapper($field);

        return $typeOnly ? $mapper->type : $mapper->render();
    }

    public static function escapeIdentifier(string $segment, int $type) : string 
    {
        switch($type) {
            default:
            case static::IDENTIFIER_SCHEMA:
            case static::IDENTIFIER_DATABASE:
            case static::IDENTIFIER_TABLE:
            case static::IDENTIFIER_FIELD:
                return "[" . trim(str_replace(["[", "]"], [ "[[", "]]" ], $segment), '[]') . "]";

            case static::IDENTIFIER_VALUE:
                return "'$segment'";
        }
    }

    public function defaultEngine(): ? string
    {
        return null;
    }

    public function repositoryClass() : string
    {
        return Repository\MssqlRepository::class;
    }

    public function queryBuilderClass() : string
    {
        return QueryBuilder\Sql\MssqlQueryBuilder::class;
    }

    public function schemaTable(ConnectionAdapter $adapter, $databaseName, string $tableName) : null|object
    {
        return \Ulmus\Entity\Mssql\Table::repository(Repository::DEFAULT_ALIAS, $adapter)
            ->select(\Ulmus\Common\Sql::raw('this.*'))
            ->where($this->escapeIdentifier('table_schema', AdapterInterface::IDENTIFIER_FIELD), $databaseName)
            ->or($this->escapeIdentifier('table_catalog', AdapterInterface::IDENTIFIER_FIELD), $databaseName)
            ->loadOneFromField($this->escapeIdentifier('table_name', AdapterInterface::IDENTIFIER_FIELD), $tableName);
    }
}