/*
 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
 *   Jonathan Schleifer <js@heap.zone>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
 * the packaging of this file.
 *
 * Alternatively, it may be distributed under the terms of the GNU General
 * Public License, either version 2 or 3, which can be found in the file
 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#include "config.h"

#include <assert.h>
#include <errno.h>

#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#include "unistd_wrapper.h"

#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif

#import "OFFile.h"
#import "OFString.h"
#import "OFLocalization.h"

#import "OFInitializationFailedException.h"
#import "OFInvalidArgumentException.h"
#import "OFNotOpenException.h"
#import "OFOpenItemFailedException.h"
#import "OFOutOfMemoryException.h"
#import "OFOutOfRangeException.h"
#import "OFReadFailedException.h"
#import "OFSeekFailedException.h"
#import "OFWriteFailedException.h"

#ifdef OF_WINDOWS
# include <windows.h>
#endif

#ifdef OF_WII
# define BOOL OGC_BOOL
# include <fat.h>
# undef BOOL
#endif

#ifdef OF_NINTENDO_DS
# include <stdbool.h>
# include <filesystem.h>
#endif

#ifndef O_BINARY
# define O_BINARY 0
#endif
#ifndef O_CLOEXEC
# define O_CLOEXEC 0
#endif
#ifndef O_EXCL
# define O_EXCL 0
#endif
#ifndef O_EXLOCK
# define O_EXLOCK 0
#endif

#ifndef OF_MORPHOS
# define closeHandle(h) close(h)
#else
struct of_file_handle {
	of_file_handle_t previous, next;
	BPTR handle;
	bool append;
} *firstHandle = NULL;

static void
closeHandle(of_file_handle_t handle)
{
	Close(handle->handle);

	if (handle->previous != NULL)
		handle->previous->next = handle->next;
	if (handle->next != NULL)
		handle->next->previous = handle->previous;

	if (firstHandle == handle)
		firstHandle = handle->next;

	free(handle);
}

OF_DESTRUCTOR()
{
	for (of_file_handle_t iter = firstHandle; iter != NULL;
	    iter = iter->next)
		Close(iter->handle);
}
#endif

#ifndef OF_MORPHOS
static int
parseMode(const char *mode)
{
	if (strcmp(mode, "r") == 0)
		return O_RDONLY;
	if (strcmp(mode, "r+") == 0)
		return O_RDWR;
	if (strcmp(mode, "w") == 0)
		return O_WRONLY | O_CREAT | O_TRUNC;
	if (strcmp(mode, "wx") == 0)
		return O_WRONLY | O_CREAT | O_EXCL | O_EXLOCK;
	if (strcmp(mode, "w+") == 0)
		return O_RDWR | O_CREAT | O_TRUNC;
	if (strcmp(mode, "w+x") == 0)
		return O_RDWR | O_CREAT | O_EXCL | O_EXLOCK;
	if (strcmp(mode, "a") == 0)
		return O_WRONLY | O_CREAT | O_APPEND;
	if (strcmp(mode, "a+") == 0)
		return O_RDWR | O_CREAT | O_APPEND;

	return -1;
}
#else
static int
parseMode(const char *mode, bool *append)
{
	*append = false;

	if (strcmp(mode, "r") == 0)
		return MODE_OLDFILE;
	if (strcmp(mode, "w") == 0)
		return MODE_NEWFILE;
	if (strcmp(mode, "wx") == 0)
		return MODE_NEWFILE;
	if (strcmp(mode, "a") == 0) {
		*append = true;
		return MODE_READWRITE;
	}
	if (strcmp(mode, "rb") == 0)
		return MODE_OLDFILE;
	if (strcmp(mode, "wb") == 0)
		return MODE_NEWFILE;
	if (strcmp(mode, "wbx") == 0)
		return MODE_NEWFILE;
	if (strcmp(mode, "ab") == 0) {
		*append = true;
		return MODE_READWRITE;
	}
	if (strcmp(mode, "r+") == 0)
		return MODE_OLDFILE;
	if (strcmp(mode, "w+") == 0)
		return MODE_NEWFILE;
	if (strcmp(mode, "a+") == 0) {
		*append = true;
		return MODE_READWRITE;
	}
	if (strcmp(mode, "r+b") == 0 || strcmp(mode, "rb+") == 0)
		return MODE_OLDFILE;
	if (strcmp(mode, "w+b") == 0 || strcmp(mode, "wb+") == 0)
		return MODE_NEWFILE;
	if (strcmp(mode, "w+bx") == 0 || strcmp(mode, "wb+x") == 0)
		return MODE_NEWFILE;
	if (strcmp(mode, "ab+") == 0 || strcmp(mode, "a+b") == 0) {
		*append = true;
		return MODE_READWRITE;
	}

	return -1;
}
#endif

@implementation OFFile
+ (void)initialize
{
	if (self != [OFFile class])
		return;

#ifdef OF_WII
	if (!fatInitDefault())
		@throw [OFInitializationFailedException
		    exceptionWithClass: self];
#endif

#ifdef OF_NINTENDO_DS
	if (!nitroFSInit(NULL))
		@throw [OFInitializationFailedException
		    exceptionWithClass: self];
#endif
}

+ (instancetype)fileWithPath: (OFString *)path
			mode: (OFString *)mode
{
	return [[[self alloc] initWithPath: path
				      mode: mode] autorelease];
}

+ (instancetype)fileWithHandle: (of_file_handle_t)handle
{
	return [[[self alloc] initWithHandle: handle] autorelease];
}

- init
{
	OF_INVALID_INIT_METHOD
}

- initWithPath: (OFString *)path
	  mode: (OFString *)mode
{
	of_file_handle_t handle;

	@try {
		void *pool = objc_autoreleasePoolPush();
		int flags;

#ifndef OF_MORPHOS
		if ((flags = parseMode([mode UTF8String])) == -1)
			@throw [OFInvalidArgumentException exception];

		flags |= O_BINARY | O_CLOEXEC;

# if defined(OF_WINDOWS)
		if ((handle = _wopen([path UTF16String], flags,
		    _S_IREAD | _S_IWRITE)) == -1)
# elif defined(OF_HAVE_OFF64_T)
		if ((handle = open64([path cStringWithEncoding:
		    [OFLocalization encoding]], flags, 0666)) == -1)
# else
		if ((handle = open([path cStringWithEncoding:
		    [OFLocalization encoding]], flags, 0666)) == -1)
# endif
			@throw [OFOpenItemFailedException
			    exceptionWithPath: path
					 mode: mode
					errNo: errno];
#else
		if ((handle = malloc(sizeof(*handle))) == NULL)
			@throw [OFOutOfMemoryException
			    exceptionWithRequestedSize: sizeof(*handle)];

		@try {
			if ((flags = parseMode([mode UTF8String],
			    &handle->append)) == -1)
				@throw [OFInvalidArgumentException exception];

			if ((handle->handle = Open([path cStringWithEncoding:
			    [OFLocalization encoding]], flags)) == 0) {
				int errNo;

				switch (IoErr()) {
				case ERROR_OBJECT_IN_USE:
				case ERROR_DISK_NOT_VALIDATED:
					errNo = EBUSY;
					break;
				case ERROR_OBJECT_NOT_FOUND:
					errNo = ENOENT;
					break;
				case ERROR_DISK_WRITE_PROTECTED:
					errNo = EROFS;
					break;
				case ERROR_WRITE_PROTECTED:
				case ERROR_READ_PROTECTED:
					errNo = EACCES;
					break;
				default:
					errNo = 0;
					break;
				}

				@throw [OFOpenItemFailedException
				    exceptionWithPath: path
						 mode: mode
						errNo: errNo];
			}

			if (handle->append) {
				if (Seek64(handle->handle, 0,
				    OFFSET_END) == -1) {
					Close(handle->handle);
					@throw [OFOpenItemFailedException
					    exceptionWithPath: path
							 mode: mode
							errNo: EIO];
				}
			}

			handle->previous = NULL;
			handle->next = firstHandle;

			if (firstHandle != NULL)
				firstHandle->previous = handle;

			firstHandle = handle;
		} @catch (id e) {
			free(handle);
			@throw e;
		}
#endif

		objc_autoreleasePoolPop(pool);
	} @catch (id e) {
		[self release];
		@throw e;
	}

	@try {
		self = [self initWithHandle: handle];
	} @catch (id e) {
		closeHandle(handle);
		@throw e;
	}

	return self;
}

- initWithHandle: (of_file_handle_t)handle
{
	self = [super init];

	_handle = handle;

	return self;
}

- (bool)lowlevelIsAtEndOfStream
{
	if (_handle == OF_INVALID_FILE_HANDLE)
		@throw [OFNotOpenException exceptionWithObject: self];

	return _atEndOfStream;
}

- (size_t)lowlevelReadIntoBuffer: (void *)buffer
			  length: (size_t)length
{
	ssize_t ret;

	if (_handle == OF_INVALID_FILE_HANDLE)
		@throw [OFNotOpenException exceptionWithObject: self];

#if defined(OF_WINDOWS)
	if (length > UINT_MAX)
		@throw [OFOutOfRangeException exception];

	if ((ret = read(_handle, buffer, (unsigned int)length)) < 0)
		@throw [OFReadFailedException exceptionWithObject: self
						  requestedLength: length
							    errNo: errno];
#elif defined(OF_MORPHOS)
	if (length > LONG_MAX)
		@throw [OFOutOfRangeException exception];

	if ((ret = Read(_handle->handle, buffer, length)) < 0)
		@throw [OFReadFailedException exceptionWithObject: self
						  requestedLength: length
							    errNo: EIO];
#else
	if ((ret = read(_handle, buffer, length)) < 0)
		@throw [OFReadFailedException exceptionWithObject: self
						  requestedLength: length
							    errNo: errno];
#endif

	if (ret == 0)
		_atEndOfStream = true;

	return ret;
}

- (void)lowlevelWriteBuffer: (const void *)buffer
		     length: (size_t)length
{
	if (_handle == OF_INVALID_FILE_HANDLE)
		@throw [OFNotOpenException exceptionWithObject: self];

#if defined(OF_WINDOWS)
	int bytesWritten;

	if (length > INT_MAX)
		@throw [OFOutOfRangeException exception];

	if ((bytesWritten = write(_handle, buffer, (int)length)) < 0)
		@throw [OFWriteFailedException exceptionWithObject: self
						   requestedLength: length
						      bytesWritten: 0
							     errNo: errno];
#elif defined(OF_MORPHOS)
	LONG bytesWritten;

	if (length > LONG_MAX)
		@throw [OFOutOfRangeException exception];

	if (_handle->append) {
		if (Seek64(_handle->handle, 0, OFFSET_END) == -1)
			@throw [OFWriteFailedException
			    exceptionWithObject: self
				requestedLength: length
				   bytesWritten: 0
					  errNo: EIO];
	}

	if ((bytesWritten = Write(_handle->handle, (void *)buffer, length)) < 0)
		@throw [OFWriteFailedException exceptionWithObject: self
						   requestedLength: length
						      bytesWritten: 0
							     errNo: EIO];
#else
	ssize_t bytesWritten;

	if (length > SSIZE_MAX)
		@throw [OFOutOfRangeException exception];

	if ((bytesWritten = write(_handle, buffer, length)) < 0)
		@throw [OFWriteFailedException exceptionWithObject: self
						   requestedLength: length
						      bytesWritten: 0
							     errNo: errno];
#endif

	if ((size_t)bytesWritten != length)
		@throw [OFWriteFailedException exceptionWithObject: self
						   requestedLength: length
						      bytesWritten: bytesWritten
							     errNo: 0];
}

- (of_offset_t)lowlevelSeekToOffset: (of_offset_t)offset
			     whence: (int)whence
{
	of_offset_t ret;

	if (_handle == OF_INVALID_FILE_HANDLE)
		@throw [OFNotOpenException exceptionWithObject: self];

#ifndef OF_MORPHOS
# if defined(OF_WINDOWS)
	ret = _lseeki64(_handle, offset, whence);
# elif defined(OF_HAVE_OFF64_T)
	ret = lseek64(_handle, offset, whence);
# else
	ret = lseek(_handle, offset, whence);
# endif

	if (ret == -1)
		@throw [OFSeekFailedException exceptionWithStream: self
							   offset: offset
							   whence: whence
							    errNo: errno];
#else
	switch (whence) {
	case SEEK_SET:
		ret = Seek64(_handle->handle, offset, OFFSET_BEGINNING);
		break;
	case SEEK_CUR:
		ret = Seek64(_handle->handle, offset, OFFSET_CURRENT);
		break;
	case SEEK_END:
		ret = Seek64(_handle->handle, offset, OFFSET_END);
		break;
	default:
		ret = -1;
		break;
	}

	if (ret == -1)
		@throw [OFSeekFailedException exceptionWithStream: self
							   offset: offset
							   whence: whence
							    errNo: EINVAL];
#endif

	_atEndOfStream = false;

	return ret;
}

#ifdef OF_FILE_HANDLE_IS_FD
- (int)fileDescriptorForReading
{
	return _handle;
}

- (int)fileDescriptorForWriting
{
	return _handle;
}
#endif

- (void)close
{
	if (_handle != OF_INVALID_FILE_HANDLE)
		closeHandle(_handle);

	_handle = OF_INVALID_FILE_HANDLE;

	[super close];
}

- (void)dealloc
{
	[self close];

	[super dealloc];
}
@end