// Copyright 2008 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#pragma once

#include <cstddef>
#include <cstdio>
#include <fstream>
#include <string>
#include <vector>

#include "Common/CommonTypes.h"
#include "Common/NonCopyable.h"

#ifdef _WIN32
#include "Common/StringUtil.h"
#endif

// User directory indices for GetUserPath
enum {
	D_USER_IDX,
	D_GCUSER_IDX,
	D_WIIROOT_IDX, // always points to User/Wii or global user-configured directory
	D_SESSION_WIIROOT_IDX, // may point to minimal temporary directory for determinism
	D_CONFIG_IDX, // global settings
	D_GAMESETTINGS_IDX, // user-specified settings which override both the global and the default settings (per game)
	D_MAPS_IDX,
	D_CACHE_IDX,
	D_SHADERCACHE_IDX,
	D_SHADERS_IDX,
	D_STATESAVES_IDX,
	D_SCREENSHOTS_IDX,
	D_HIRESTEXTURES_IDX,
	D_DUMP_IDX,
	D_DUMPFRAMES_IDX,
	D_DUMPAUDIO_IDX,
	D_DUMPTEXTURES_IDX,
	D_DUMPDSP_IDX,
	D_LOAD_IDX,
	D_LOGS_IDX,
	D_MAILLOGS_IDX,
	D_THEMES_IDX,
	D_PIPES_IDX,
	F_DOLPHINCONFIG_IDX,
	F_DEBUGGERCONFIG_IDX,
	F_LOGGERCONFIG_IDX,
	F_MAINLOG_IDX,
	F_RAMDUMP_IDX,
	F_ARAMDUMP_IDX,
	F_FAKEVMEMDUMP_IDX,
	F_GCSRAM_IDX,
	NUM_PATH_INDICES
};

namespace File
{

// FileSystem tree node/
struct FSTEntry
{
	bool isDirectory;
	u64 size;                 // File length, or for directories, recursive count of children
	std::string physicalName; // Name on disk
	std::string virtualName;  // Name in FST names table
	std::vector<FSTEntry> children;
};

// Returns true if file filename exists
bool Exists(const std::string &filename);

// Returns true if filename is a directory
bool IsDirectory(const std::string &filename);

// Returns the size of filename (64bit)
u64 GetSize(const std::string &filename);

// Overloaded GetSize, accepts file descriptor
u64 GetSize(const int fd);

// Overloaded GetSize, accepts FILE*
u64 GetSize(FILE *f);

// Returns true if successful, or path already exists.
bool CreateDir(const std::string &filename);

// Creates the full path of fullPath returns true on success
bool CreateFullPath(const std::string &fullPath);

// Deletes a given filename, return true on success
// Doesn't supports deleting a directory
bool Delete(const std::string &filename);

// Deletes a directory filename, returns true on success
bool DeleteDir(const std::string &filename);

// renames file srcFilename to destFilename, returns true on success
bool Rename(const std::string &srcFilename, const std::string &destFilename);

// ditto, but syncs the source file and, on Unix, syncs the directories after rename
bool RenameSync(const std::string &srcFilename, const std::string &destFilename);

// copies file srcFilename to destFilename, returns true on success
bool Copy(const std::string &srcFilename, const std::string &destFilename);

// creates an empty file filename, returns true on success
bool CreateEmptyFile(const std::string &filename);

// Recursive or non-recursive list of files under directory.
FSTEntry ScanDirectoryTree(const std::string &directory, bool recursive);

// deletes the given directory and anything under it. Returns true on success.
bool DeleteDirRecursively(const std::string &directory);

// Returns the current directory
std::string GetCurrentDir();

// Create directory and copy contents (does not overwrite existing files)
void CopyDir(const std::string &source_path, const std::string &dest_path);

// Set the current directory to given directory
bool SetCurrentDir(const std::string &directory);

// Creates and returns the path to a new temporary directory.
std::string CreateTempDir();

// Get a filename that can hopefully be atomically renamed to the given path.
std::string GetTempFilenameForAtomicWrite(const std::string &path);

// Gets a set user directory path
// Don't call prior to setting the base user directory
const std::string& GetUserPath(unsigned int dir_index);

// Sets a user directory path
// Rebuilds internal directory structure to compensate for the new directory
void SetUserPath(unsigned int dir_index, const std::string& path);

// probably doesn't belong here
std::string GetThemeDir(const std::string& theme_name);

// Returns the path to where the sys file are
std::string GetSysDirectory();

#ifdef __APPLE__
std::string GetBundleDirectory();
#endif

std::string &GetExeDirectory();

bool WriteStringToFile(const std::string& str, const std::string& filename);
bool ReadFileToString(const std::string& filename, std::string& str);

// simple wrapper for cstdlib file functions to
// hopefully will make error checking easier
// and make forgetting an fclose() harder
class IOFile : public NonCopyable
{
public:
	IOFile();
	IOFile(std::FILE* file);
	IOFile(const std::string& filename, const char openmode[]);

	~IOFile();

	IOFile(IOFile&& other);
	IOFile& operator=(IOFile&& other);

	void Swap(IOFile& other);

	bool Open(const std::string& filename, const char openmode[]);
	bool Close();

	template <typename T>
	bool ReadArray(T* data, size_t length, size_t* pReadBytes = nullptr)
	{
		size_t read_bytes = 0;
		if (!IsOpen() || length != (read_bytes = std::fread(data, sizeof(T), length, m_file)))
			m_good = false;

		if (pReadBytes)
			*pReadBytes = read_bytes;

		return m_good;
	}

	template <typename T>
	bool WriteArray(const T* data, size_t length)
	{
		if (!IsOpen() || length != std::fwrite(data, sizeof(T), length, m_file))
			m_good = false;

		return m_good;
	}

	bool ReadBytes(void* data, size_t length)
	{
		return ReadArray(reinterpret_cast<char*>(data), length);
	}

	bool WriteBytes(const void* data, size_t length)
	{
		return WriteArray(reinterpret_cast<const char*>(data), length);
	}

	bool IsOpen() const { return nullptr != m_file; }

	// m_good is set to false when a read, write or other function fails
	bool IsGood() const { return m_good; }
	operator void*() { return m_good ? m_file : nullptr; }

	std::FILE* ReleaseHandle();

	std::FILE* GetHandle() { return m_file; }

	void SetHandle(std::FILE* file);

	bool Seek(s64 off, int origin);
	u64 Tell() const;
	u64 GetSize();
	bool Resize(u64 size);
	bool Flush();

	// clear error state
	void Clear() { m_good = true; std::clearerr(m_file); }

	std::FILE* m_file;
	bool m_good;
private:
	IOFile(IOFile&);
	IOFile& operator=(IOFile& other);
};

}  // namespace

// To deal with Windows being dumb at unicode:
template <typename T>
void OpenFStream(T& fstream, const std::string& filename, std::ios_base::openmode openmode)
{
#ifdef _WIN32
	fstream.open(UTF8ToTStr(filename).c_str(), openmode);
#else
	fstream.open(filename.c_str(), openmode);
#endif
}