#if defined(DBA_ENABLE_SQLITE)
//////////////////////////////////////////////////////////////////////
// Copyright (c) 2010, Oliver 'kfs1' Smith <oliver@kfs.org>
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// - Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// - Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// - Neither the name of KingFisher Software nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
//////////////////////////////////////////////////////////////////////
//

#include "dbaConn.h"						// Main include file
#include <sstream>

namespace DBA
{

//////////////////////////////////////////////////////////////////////
// Constructor for SQLiteConnection type

SQLiteConnection::SQLiteConnection()
	: Connection()
	, m_conn(NULL)
	, m_result(NULL)
{
}

//////////////////////////////////////////////////////////////////////
// Destructor: Ensure resource cleanup.

SQLiteConnection::~SQLiteConnection()
{
	if ( m_result != NULL )
		ReleaseResult() ;

	if ( m_conn != NULL )
		Disconnect() ;
}

//////////////////////////////////////////////////////////////////////
// Connect to an SQLite database.

void
SQLiteConnection::Connect(const Credentials& credentials, unsigned int flags, bool autoReconnect /* = false */)
{
	sqlite3* conn = NULL ;

	// If the user didn't supply a driver, open wants a NULL.
	const char* vfs = (credentials.driver == NULL || credentials.driver[0] == 0 ? NULL : credentials.driver) ;

	int result = sqlite3_open_v2(credentials.database, &conn, flags, vfs) ;
	if ( result != SQLITE_OK )
	{
		std::stringstream error ;
		error << "Unable to open database '" << credentials.database << "': " ;
		ThrowError(error.rdbuf()->str().c_str()) ;
	}

	m_conn = conn ;
}

//////////////////////////////////////////////////////////////////////
// Disconnect from SQLite database

void
SQLiteConnection::Disconnect()
{
	if ( m_currentResult != NULL )
		m_currentResult->Release() ;

	_releaseResultSet() ;

	if ( m_conn )
	{
		sqlite3_close(m_conn) ;
		m_conn = NULL ;
	}
}

//////////////////////////////////////////////////////////////////////
// Clean up the result set.

void
SQLiteConnection::_releaseResultSet()
{
	if ( m_result )
	{
		sqlite3_finalize(m_result) ;
		m_result = NULL ;
	}
}

//////////////////////////////////////////////////////////////////////
// Execute an SQL statement

void
SQLiteConnection::_execute(size_t stlen, const char* statement)
{
	m_error = sqlite3_prepare_v2(m_conn, statement, stlen, &m_result, NULL) ;
	if ( m_error != SQLITE_OK )
	{
		ThrowError("Statement Error: ") ;
	}
}

//////////////////////////////////////////////////////////////////////
// Process results that were retrieved with execute.

void
SQLiteConnection::_processResultSet()
{
	m_error = sqlite3_step(m_result) ;

	m_affectedRows = (size_t)sqlite3_changes(m_conn) ;
	m_lastInsertID = (size_t)sqlite3_last_insert_rowid(m_conn) ;

	// Didn't return a row.
	if ( m_error != SQLITE_ROW )
	{
		return ;
	}

	// Set the number of rows to be 1, and the current row to 0
	// this makes it look like there is at least one row available.
	m_rows = 1 ;
	m_currentRow = 0 ;

	m_cols = sqlite3_column_count(m_result) ;
}

//////////////////////////////////////////////////////////////////////
// Attempt to retrieve the next row.

bool
SQLiteConnection::FetchRow()
{
	m_currentColumn = 0 ;

	if ( m_currentRow > 0 )
	{
		if ( m_currentRow >= m_rows )
			return false ;

		// SQLite fetches the first row in _processResults,
		// so we only need to fetch rows after the first.
		m_error = sqlite3_step(m_result) ;
	}

	// Did we reach the last row?
	if ( m_error == SQLITE_DONE )
	{
		sqlite3_reset(m_result) ;
		m_rows = m_currentRow ;
		return false ;
	}

	// SQLite returns SQLITE_ROW for "not the last row".
	if ( m_error != SQLITE_ROW )
	{
		ThrowError("Error retrieving row: ") ;
	}

	++m_currentRow ;
	++m_rows ;

	return true ;
}

} ; // namespace DBA

#endif // DBA_ENABLE_SQLITE
