// utilities for platform ...
//
// Date: 2023-06-30
//

#pragma once

#include <sane/sane_ex.h>
#include <string>
#include <memory>

enum log_type
{
	LOG_TYPE_NONE = 0,	// no logging
	LOG_TYPE_CONSOLE,	// print to console
	LOG_TYPE_FILE,		// write log into file
};
enum log_level
{
	LOG_LEVEL_ALL = 0,
	LOG_LEVEL_DEBUG,
	LOG_LEVEL_WARNING,
	LOG_LEVEL_FATAL,
};

namespace utils
{
	std::string utf82ansi(const char* utf8);
	std::string ansi2utf8(const char* ansi);

	std::string get_command_result(const char* cmd, int len = -1);
	std::string	get_local_data_path(void);
	std::string temporary_path(void);
	std::string format_current_time(void);
	std::string get_module_full_path(const char* part_name = nullptr/*nullptr to get main-pe/first module's full path*/);
	std::string find_file(const char* root_dir, const char* part_name, bool recursive = false);
	std::string target_file_from_link(const char* lnk_file);
	std::string	get_ini_value(const char* seg, const char* key, const char* cfg_file);	// return "" if not found
	std::string load_mini_file(const char* file, int* err);		// <= 1MB
	int save_2_file(void* data, size_t len, const char* file, bool append = false/*append or new*/, size_t max_size = -1/*in append mode, truncate file if size is exceeded this value if was not -1*/);

	bool is_match_pattern(const char* text, const char* pattern);
	const char* to_lower(std::string& str);	// return str.c_str()
	const char* trim(std::string& str, const char* sp = "\r\n\t ");		// return str.c_str()

	HMODULE load_dll(const char* path_file, int flag);
	bool create_folder(const char* folder);
	void set_ini_value(const char* seg, const char* key, const char* val, const char* cfg_file);
	int enum_file(const char* folder, bool recursive, bool/*return false to stop enumeration*/(STDCALL* found)(const char* path_name, bool dir, void* param), void* param);
	int move_file(const char* from, const char* to);

	int get_disk_space(const char* path, unsigned long long* total, unsigned long long* avail, unsigned long long* block);
	unsigned int get_page_size(unsigned int* map_unit = nullptr);

	void init_log(log_type type, log_level level = LOG_LEVEL_ALL, const char* fn_appendix = nullptr/*appendix to default log-file-name*/);
	void uninit(void);
	void log_info(const char* info, int level = LOG_LEVEL_ALL);
	void log_mem_info(const char* desc, const void* data, size_t bytes, int level = LOG_LEVEL_ALL);	// log as 0x12345678 00 01 02 ...
	int get_log_type(void);
	int get_log_level(void);
	int copy_log_file_to(const char* dst);
	int clear_log_file(void);

	template<typename ... Args>
	void to_log(int level, const char* fmt, Args ... args)
	{
		if (get_log_type() != LOG_TYPE_NONE && get_log_level() <= level)
		{
			size_t 		size = snprintf(nullptr, 0, fmt, args ...) + 2;
			std::unique_ptr<char[]> buf(new char[size]);

			snprintf(buf.get(), size, fmt, args ...);
			log_info(buf.get(), (log_level)level);
		}
	}

	template<typename ... Args>
	void to_log_with_api(bool(*is_enable)(int), void(*log_api)(const char*, int), int level, const char* fmt, Args ... args)
	{
		if (is_enable(level))
		{
			size_t 		size = snprintf(nullptr, 0, fmt, args ...) + 2;
			std::unique_ptr<char[]> buf(new char[size]);

			snprintf(buf.get(), size, fmt, args ...);
			log_api(buf.get(), (log_level)level);
		}
	}
};

#if OS_WIN
struct _time_val
{
	time_t tv_sec;		/* Seconds.  */
	time_t tv_usec;	/* Microseconds.  */
};
typedef struct _time_val TIMEV;

struct timezone
{
	int tz_minuteswest;		/* Minutes west of GMT.  */
	int tz_dsttime;		/* Nonzero if DST is ever in effect.  */
};
int gettimeofday(TIMEV* tv, struct timezone* tz);
#else
#include <sys/time.h>

typedef struct timeval TIMEV;
#endif

class chronograph
{
	TIMEV  bgn_;

public:
	chronograph();
	~chronograph();

	static bool now(TIMEV* tv);
	static bool now(uint64_t* seconds, uint64_t* u_seconds);
	static std::string now(bool with_ms = true/*whether with milliseconds*/);     // return '2022-11-30 10:38:42.123', no '.123' if with_ms was false

public:
	uint64_t elapse_s(void);
	uint64_t elapse_ms(void);
	uint64_t elapse_us(void);
	void reset(void);
};