/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <log4cxx/logstring.h>
#include <log4cxx/helpers/fileinputstream.h>
#include <log4cxx/helpers/exception.h>
#include <log4cxx/helpers/bytebuffer.h>
#include <log4cxx/helpers/pool.h>
#include <apr_file_io.h>

using namespace LOG4CXX_NS;
using namespace LOG4CXX_NS::helpers;

struct FileInputStream::FileInputStreamPrivate
{
	FileInputStreamPrivate(const File& aFile)
		: path(aFile)
		{}

	File path;
	Pool pool;
	apr_file_t* fileptr{ nullptr };
	void open();
};

IMPLEMENT_LOG4CXX_OBJECT(FileInputStream)

FileInputStream::FileInputStream(const LogString& filename) :
	m_priv(std::make_unique<FileInputStreamPrivate>(filename))
{
	m_priv->open();
}

FileInputStream::FileInputStream(const logchar* filename) :
	m_priv(std::make_unique<FileInputStreamPrivate>(filename))
{
	m_priv->open();
}


void FileInputStream::FileInputStreamPrivate::open()
{
	apr_fileperms_t perm = APR_OS_DEFAULT;
	apr_int32_t flags = APR_READ;
	apr_status_t stat = apr_file_open(&this->fileptr, this->path.getAPRPath(), flags, perm, this->pool.getAPRPool());

	if (stat != APR_SUCCESS)
	{
		throw IOException(this->path.getAPRPath(), stat);
	}
}


FileInputStream::FileInputStream(const File& aFile) :
	m_priv(std::make_unique<FileInputStreamPrivate>(aFile))
{
	m_priv->open();
}


FileInputStream::~FileInputStream()
{
	if (m_priv->fileptr)
	{
		apr_file_close(m_priv->fileptr);
	}
}


void FileInputStream::close()
{
	apr_status_t stat = apr_file_close(m_priv->fileptr);

	if (stat == APR_SUCCESS)
	{
		m_priv->fileptr = NULL;
	}
	else
	{
		throw IOException(stat);
	}
}


int FileInputStream::read(ByteBuffer& buf)
{
	apr_size_t bytesRead = buf.remaining();
	apr_status_t stat = apr_file_read(m_priv->fileptr, buf.current(), &bytesRead);
	int retval = -1;

	if (!APR_STATUS_IS_EOF(stat))
	{
		if (stat != APR_SUCCESS)
		{
			throw IOException(stat);
		}

		buf.increment_position(bytesRead);
		retval = (int)bytesRead;
	}

	return retval;
}