/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "ags/shared/core/platform.h"
#include "ags/shared/util/buffered_stream.h"
#include "ags/shared/util/directory.h"
#include "ags/shared/util/file.h"
#include "ags/shared/util/file_stream.h"
#include "ags/shared/util/path.h"
#include "ags/shared/util/stdio_compat.h"
#include "common/file.h"
#include "common/savefile.h"
#include "common/system.h"

namespace AGS3 {
namespace AGS {
namespace Shared {

bool File::IsDirectory(const String &filename) {
	// stat() does not like trailing slashes, remove them
	String fixed_path = Path::MakePathNoSlash(filename);
	return ags_directory_exists(fixed_path.GetCStr()) != 0;
}

bool File::IsFile(const String &filename) {
	return ags_file_exists(filename.GetCStr()) != 0;
}

bool File::IsFileOrDir(const String &filename) {
	// stat() does not like trailing slashes, remove them
	String fixed_path = Path::MakePathNoSlash(filename);
	return ags_path_exists(fixed_path.GetCStr()) != 0;
}

soff_t File::GetFileSize(const String &filename) {
	if (filename.IsEmpty())
		return 0;
	return ags_file_size(filename.GetCStr());
}

bool File::TestReadFile(const String &filename) {
	if (filename.IsEmpty())
		return false;
	return ags_file_exists(filename.GetCStr());
}

bool File::TestWriteFile(const String &filename) {
	if (filename.IsEmpty())
		return false;
	return TestCreateFile(filename);
}

bool File::TestCreateFile(const String &filename) {
	if (filename.IsEmpty())
		return false;

	Common::OutSaveFile *sf = g_system->getSavefileManager()->openForSaving(filename);
	bool result = sf != nullptr;
	delete sf;

	return result;
}

bool File::DeleteFile(const String &filename) {
	// Only allow deleting files in the savegame folder
	if (filename.CompareLeftNoCase(SAVE_FOLDER_PREFIX) != 0) {
		warning("Cannot delete file %s. Only files in the savegame directory can be deleted", filename.GetCStr());
		return false;
	}
	Common::String file(filename.GetCStr() + strlen(SAVE_FOLDER_PREFIX));
	return g_system->getSavefileManager()->removeSavefile(file);
}

bool File::RenameFile(const String &old_name, const String &new_name) {
	// Only allow renaming files in the savegame folder
	if (old_name.CompareLeftNoCase(SAVE_FOLDER_PREFIX) || new_name.CompareLeftNoCase(SAVE_FOLDER_PREFIX)) {
		warning("Cannot rename file %s to %s. Only files in the savegame directory can be renamed", old_name.GetCStr(), new_name.GetCStr());
		return false;
	}
	Common::String file_old(old_name.GetCStr() + strlen(SAVE_FOLDER_PREFIX));
	Common::String file_new(new_name.GetCStr() + strlen(SAVE_FOLDER_PREFIX));
	return g_system->getSavefileManager()->renameSavefile(file_old, file_new);
}

bool File::CopyFile(const String &src_path, const String &dst_path, bool overwrite) {
	// Only allow copying files to the savegame folder
	// In theory it should be possible to copy any file to to save folder, but
	// let's restrict only to files that are already in the save folder for now
	if (src_path.CompareLeftNoCase(SAVE_FOLDER_PREFIX) || dst_path.CompareLeftNoCase(SAVE_FOLDER_PREFIX)) {
		warning("Cannot copy file %s to %s. Source and destination files must be in the savegame directory", src_path.GetCStr(), dst_path.GetCStr());
		return false;
	}
	if (ags_file_exists(dst_path.GetCStr()) && !overwrite) {
		warning("Cannot copy file %s to %s. File exists", src_path.GetCStr(), dst_path.GetCStr());
		return false;
	}
	Common::String file_src(src_path.GetCStr() + strlen(SAVE_FOLDER_PREFIX));
	Common::String file_dest(dst_path.GetCStr() + strlen(SAVE_FOLDER_PREFIX));
	return g_system->getSavefileManager()->copySavefile(file_src, file_dest);
}

bool File::GetFileModesFromCMode(const String &cmode, FileOpenMode &open_mode, FileWorkMode &work_mode) {
	// We do not test for 'b' and 't' here, because text mode reading/writing should be done with
	// the use of ITextReader and ITextWriter implementations.
	// The number of supported variants here is quite limited due the restrictions AGS makes on them.
	bool read_base_mode = false;
	// Default mode is open/read for safety reasons
	open_mode = kFile_Open;
	work_mode = kFile_Read;
	for (size_t c = 0; c < cmode.GetLength(); ++c) {
		if (read_base_mode) {
			if (cmode[c] == '+') {
				work_mode = kFile_ReadWrite;
			}
			break;
		} else {
			if (cmode[c] == 'r') {
				open_mode = kFile_Open;
				work_mode = kFile_Read;
				read_base_mode = true;
			} else if (cmode[c] == 'a') {
				open_mode = kFile_Create;
				work_mode = kFile_Write;
				read_base_mode = true;
			} else if (cmode[c] == 'w') {
				open_mode = kFile_CreateAlways;
				work_mode = kFile_Write;
				read_base_mode = true;
			}
		}
	}
	return read_base_mode;
}

String File::GetCMode(FileOpenMode open_mode, FileWorkMode work_mode) {
	String mode;
	if (open_mode == kFile_Open) {
		if (work_mode == kFile_Read)
			mode.AppendChar('r');
		else if (work_mode == kFile_Write || work_mode == kFile_ReadWrite)
			mode.Append("r+");
	} else if (open_mode == kFile_Create) {
		if (work_mode == kFile_Write)
			mode.AppendChar('a');
		else if (work_mode == kFile_Read || work_mode == kFile_ReadWrite)
			mode.Append("a+");
	} else if (open_mode == kFile_CreateAlways) {
		if (work_mode == kFile_Write)
			mode.AppendChar('w');
		else if (work_mode == kFile_Read || work_mode == kFile_ReadWrite)
			mode.Append("w+");
	}
	mode.AppendChar('b');
	return mode;
}

Stream *File::OpenFile(const String &filename, FileOpenMode open_mode, FileWorkMode work_mode) {
	Stream *fs = nullptr;
	//  try {
	fs = new BufferedStream(filename, open_mode, work_mode);
	if (fs != nullptr && !fs->IsValid()) {
		delete fs;
		fs = nullptr;
	}
	//  } catch (std::runtime_error) {
	//      fs = nullptr;
	//  }

	return fs;
}

Stream *File::OpenStdin() {
	error("TODO: File::OpenStdin");
}

Stream *File::OpenStdout() {
	error("TODO: File::OpenStdout");
}

Stream *File::OpenStderr() {
	error("TODO: File::OpenStderr");
}

String File::FindFileCI(const String &dir_name, const String &file_name) {
	return Path::ConcatPaths(dir_name, file_name);
}

Stream *File::OpenFileCI(const String &file_name, FileOpenMode open_mode, FileWorkMode work_mode) {
	return File::OpenFile(file_name, open_mode, work_mode);
}

Stream *File::OpenFile(const String &filename, soff_t start_off, soff_t end_off) {
	Stream *fs = new BufferedSectionStream(filename, start_off, end_off, kFile_Open, kFile_Read);
	if (fs != nullptr && !fs->IsValid()) {
		delete fs;
		return nullptr;
	}

	return fs;
}

} // namespace Shared
} // namespace AGS
} // namespace AGS3