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<?php

/**
 * MvcCore
 *
 * This source file is subject to the BSD 3 License
 * For the full copyright and license information, please view
 * the LICENSE.md file that are distributed with this source code.
 *
 * @copyright   Copyright (c) 2016 Tom Flidr (https://github.com/mvccore)
 * @license  https://mvccore.github.io/docs/mvccore/5.0.0/LICENCE.md
 */

namespace MvcCore\Ext\Models\Db;

use \MvcCore\Ext\Models\Db,
    \MvcCore\Ext\Models\Db\Readers;

class Statement implements \MvcCore\Ext\Models\Db\IStatement {

    /**
     * Database connection wrapper.
     * @var \MvcCore\Ext\Models\Db\Connection
     */
    protected $connection = NULL;

    /**
     * Internal `\PDOStatement` object.
     * @var \PDOStatement
     */
    protected $providerStatement = NULL;

    /**
     * `\PDO::prepare()` second argument (`$driver_options`) value.
     * @var array
     */
    protected $driverOptions = [];

    /**
     * Statement execution params.
     * @var array
     */
    protected $params = NULL;

    /**
     * Data reader wrapper, depends on exection call type.
     * @var Db\Reader|Readers\Multiple|Readers\Stream|Readers\Single|Readers\Execution
     */
    protected $reader = NULL;

    /**
     * Statement opened boolean:
     * - `NULL` if statement is prepared and not executed yet.
     * - `TRUE` if statement is executed and if cursor is not closed yet.
     * - `FALSE` if statement cursor is closed.
     * @var bool|NULL
     */
    protected $opened = NULL;

    
    /**
     * @inheritDocs
     * @param string|\string[] $sql 
     * @param string|int|array|\stdClass|NULL $connectionNameOrConfig
     * @param array $driverOptions
     * @return \MvcCore\Ext\Models\Db\Statement
     */
    public static function Prepare ($sql, $connectionNameOrConfig = NULL, $driverOptions = [\MvcCore\Ext\Models\Db\IStatement::AUTO_CLOSE]) {
        list(,$callerInfo) = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2);
        
        if (!isset($callerInfo['class']))
            throw new \RuntimeException(
                "Database static statement preparing has to be called from class only."
            );

        $fullClassName = '\\' . ltrim($callerInfo['class']);
        
        if ($connectionNameOrConfig === NULL) {
            
            $getMetaDataMethod = new \ReflectionMethod($fullClassName, 'getMetaData');
            $getMetaDataMethod->setAccessible(TRUE);
            list(/*$metaData*/, $connAttrArgs) = $getMetaDataMethod->invokeArgs(
                NULL, [0, [\MvcCore\Ext\Models\Db\Model\IConstants::METADATA_CONNECTIONS]]
            );

            if ($connAttrArgs > 0) 
                $connectionNameOrConfig = $connAttrArgs[0];
        }
        
        $connection = $fullClassName::GetConnection($connectionNameOrConfig, TRUE);
        
        return $connection->Prepare($sql, $driverOptions ?: []);
    }



    /**
     * Internal constructor to create statement wrapper instance.
     * @param \MvcCore\Ext\Models\Db\Connection $connection 
     * @param \PDOStatement $statement
     * @param array $driverOptions
     */
    public function __construct (
        \MvcCore\Ext\Models\Db\Connection $connection, 
        \PDOStatement $statement,
        array $driverOptions = []
    ) {
        $this->connection = $connection;
        $this->providerStatement = $statement;
        $this->driverOptions = $driverOptions;
    }



    /**
     * @inheritDocs
     * @return \MvcCore\Ext\Models\Db\Connection
     */
    public function GetConnection () {
        return $this->connection;
    }
    
    /**
     * @inheritDocs
     * @return \PDO
     */
    public function GetProvider () {
        return $this->connection->GetProvider();
    }

    /**
     * @inheritDocs
     * @return \PDOStatement
     */
    public function GetProviderStatement () {
        return $this->providerStatement;
    }
    
    /**
     * @inheritDocs
     * @return array
     */
    public function GetDriverOptions () {
        return $this->driverOptions;
    }
    
    /**
     * @inheritDocs
     * @return array Query params array, it could be sequential or associative array. 
     */
    public function & GetParams () {
        return $this->params;
    }
    
    /**
     * @inheritDocs
     * @param array $params Query params array, it could be sequential or associative array. 
     *                      This parameter can be used as an infinite argument for the function.
     * @return \MvcCore\Ext\Models\Db\Statement
     */
    public function SetParams ($params = []) {
        if (func_num_args() > 1 || (func_num_args() > 0 && !is_array(func_get_arg(0))))
            $params = func_get_args();
        if (is_array($params))
            $this->params = & $params;
        return $this;
    }
    
    /**
     * @inheritDocs
     * @throws \RuntimeException
     * @return bool
     */
    public function GetExecResult () {
        if ($this->reader === NULL)
            throw new \RuntimeException("Statement hasn't been executed yet.");
        return $this->reader->GetExecResult();
    }

    /**
     * @inheritDocs
     * @return bool
     */
    public function Close () {
        $this->opened = FALSE;
        return $this->providerStatement->closeCursor();
    }
    
    /**
     * @inheritDocs
     * @return bool|NULL
     */
    public function IsOpened () {
        return $this->opened;
    }

    /**
     * @inheritDocs
     * @throws \RuntimeException
     * @return bool
     */
    public function NextResultSet () {
        if ($this->opened !== TRUE)
            throw new \RuntimeException("Statement hasn't been executed yet.");
        return $this->providerStatement->nextRowset();
    }



    /**
     * @inheritDocs
     * @param array $params Query params array, it could be sequential or associative array. 
     *                      This parameter can be used as an infinite argument for the function.
     * @return \MvcCore\Ext\Models\Db\Readers\Multiple
     */
    public function FetchAll ($params = []) {
        if (func_num_args() > 1 || (func_num_args() > 0 && !is_array(func_get_arg(0))))
            $params = func_get_args();
        if (is_array($params))
            $this->params = & $params;
        $this->reader = new \MvcCore\Ext\Models\Db\Readers\Multiple($this);
        return $this->reader;
    }

    /**
     * @inheritDocs
     * @param array $params Query params array, it could be sequential or associative array. 
     *                      This parameter can be used as an infinite argument for the function.
     * @return \MvcCore\Ext\Models\Db\Readers\Stream
     */
    public function StreamAll ($params = []) {
        if (func_num_args() > 1 || (func_num_args() > 0 && !is_array(func_get_arg(0))))
            $params = func_get_args();
        if (is_array($params))
            $this->params = & $params;
        $this->reader = new \MvcCore\Ext\Models\Db\Readers\Stream($this);
        return $this->reader;
    }

    /**
     * @inheritDocs
     * @param array $params Query params array, it could be sequential or associative array. 
     *                      This parameter can be used as an infinite argument for the function.
     * @return \MvcCore\Ext\Models\Db\Readers\Single
     */
    public function FetchOne ($params = []) {
        if (func_num_args() > 1 || (func_num_args() > 0 && !is_array(func_get_arg(0))))
            $params = func_get_args();
        if (is_array($params))
            $this->params = & $params;
        $this->reader = new \MvcCore\Ext\Models\Db\Readers\Single($this);
        return $this->reader;
    }

    /**
     * @inheritDocs
     * @param array $params Query params array, it could be sequential or associative array. 
     *                      This parameter can be used as an infinite argument for the function.
     * @return \MvcCore\Ext\Models\Db\Readers\Execution
     */
    public function Execute ($params = []) {
        if (func_num_args() > 1 || (func_num_args() > 0 && !is_array(func_get_arg(0))))
            $params = func_get_args();
        if (is_array($params))
            $this->params = & $params;
        $this->reader = new \MvcCore\Ext\Models\Db\Readers\Execution($this);
        $this->reader->GetExecResult();
        $this->Close();
        return $this->reader;
    }
}