/*************************************************************************/
/*  os.h                                                                 */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/

#ifndef OS_H
#define OS_H

#include "list.h"
#include "os/main_loop.h"
#include "ustring.h"
#include "vector.h"
#include <stdarg.h>

/**
	@author Juan Linietsky <reduzio@gmail.com>
*/

class OS {

	static OS *singleton;
	String _execpath;
	String _custom_level;
	List<String> _cmdline;
	int ips;
	bool _keep_screen_on;
	bool low_processor_usage_mode;
	bool _verbose_stdout;
	String _local_clipboard;
	uint64_t frames_drawn;
	uint32_t _frame_delay;
	uint64_t _msec_splash;
	bool _no_window;
	int _exit_code;
	int _orientation;
	float _fps;
	int _target_fps;
	float _time_scale;
	bool _pixel_snap;
	bool _allow_hidpi;

	char *last_error;

public:
	enum RenderThreadMode {

		RENDER_THREAD_UNSAFE,
		RENDER_THREAD_SAFE,
		RENDER_SEPARATE_THREAD
	};
	struct VideoMode {

		int width, height;
		bool fullscreen;
		bool resizable;
		bool borderless_window;
		bool always_on_top;
		float get_aspect() const { return (float)width / (float)height; }
		VideoMode(int p_width = 1024, int p_height = 600, bool p_fullscreen = false, bool p_resizable = true, bool p_borderless_window = false, bool p_always_on_top = false) {
			width = p_width;
			height = p_height;
			fullscreen = p_fullscreen;
			resizable = p_resizable;
			borderless_window = p_borderless_window;
			always_on_top = p_always_on_top;
		}
	};

protected:
	friend class Main;

	RenderThreadMode _render_thread_mode;

	// functions used by main to initialize/deintialize the OS
	virtual int get_video_driver_count() const = 0;
	virtual const char *get_video_driver_name(int p_driver) const = 0;

	virtual VideoMode get_default_video_mode() const = 0;

	virtual int get_audio_driver_count() const = 0;
	virtual const char *get_audio_driver_name(int p_driver) const = 0;

	virtual void initialize_core() = 0;
	virtual void initialize(const VideoMode &p_desired, int p_video_driver, int p_audio_driver) = 0;

	virtual void set_main_loop(MainLoop *p_main_loop) = 0;
	virtual void delete_main_loop() = 0;

	virtual void finalize() = 0;
	virtual void finalize_core() = 0;

	virtual void set_cmdline(const char *p_execpath, const List<String> &p_args);

	void _ensure_data_dir();

public:
	typedef int64_t ProcessID;

	static OS *get_singleton();

	enum ErrorType {
		ERR_ERROR,
		ERR_WARNING,
		ERR_SCRIPT
	};

	virtual void print_error(const char *p_function, const char *p_file, int p_line, const char *p_code, const char *p_rationale, ErrorType p_type = ERR_ERROR);

	virtual void print(const char *p_format, ...);
	virtual void printerr(const char *p_format, ...);
	virtual void vprint(const char *p_format, va_list p_list, bool p_stderr = false) = 0;
	virtual void alert(const String &p_alert, const String &p_title = "ALERT!") = 0;
	virtual String get_stdin_string(bool p_block = true) = 0;

	virtual void set_last_error(const char *p_error);
	virtual const char *get_last_error() const;
	virtual void clear_last_error();

	enum MouseMode {
		MOUSE_MODE_VISIBLE,
		MOUSE_MODE_HIDDEN,
		MOUSE_MODE_CAPTURED
	};

	virtual void set_mouse_mode(MouseMode p_mode);
	virtual MouseMode get_mouse_mode() const;

	virtual void warp_mouse_pos(const Point2 &p_to) {}
	virtual Point2 get_mouse_pos() const = 0;
	virtual int get_mouse_button_state() const = 0;
	virtual void set_window_title(const String &p_title) = 0;

	virtual void set_clipboard(const String &p_text);
	virtual String get_clipboard() const;

	virtual void set_video_mode(const VideoMode &p_video_mode, int p_screen = 0) = 0;
	virtual VideoMode get_video_mode(int p_screen = 0) const = 0;
	virtual void get_fullscreen_mode_list(List<VideoMode> *p_list, int p_screen = 0) const = 0;

	virtual int get_screen_count() const { return 1; }
	virtual int get_current_screen() const { return 0; }
	virtual void set_current_screen(int p_screen) {}
	virtual Point2 get_screen_position(int p_screen = 0) const { return Point2(); }
	virtual Size2 get_screen_size(int p_screen = 0) const { return get_window_size(); }
	virtual int get_screen_dpi(int p_screen = 0) const { return 72; }
	virtual Point2 get_window_position() const { return Vector2(); }
	virtual void set_window_position(const Point2 &p_position) {}
	virtual Size2 get_window_size() const = 0;
	virtual Size2 get_real_window_size() const { return get_window_size(); }
	virtual void set_window_size(const Size2 p_size) {}
	virtual void set_window_fullscreen(bool p_enabled) {}
	virtual bool is_window_fullscreen() const { return true; }
	virtual void set_window_resizable(bool p_enabled) {}
	virtual bool is_window_resizable() const { return false; }
	virtual void set_window_minimized(bool p_enabled) {}
	virtual bool is_window_minimized() const { return false; }
	virtual void set_window_maximized(bool p_enabled) {}
	virtual bool is_window_maximized() const { return true; }
	virtual void set_window_always_on_top(bool p_enabled) {}
	virtual bool is_window_always_on_top() const { return false; }
	virtual void request_attention() {}
	virtual void center_window();

	virtual void set_borderless_window(int p_borderless) {}
	virtual bool get_borderless_window() { return 0; }

	virtual void set_iterations_per_second(int p_ips);
	virtual int get_iterations_per_second() const;

	virtual void set_target_fps(int p_fps);
	virtual float get_target_fps() const;

	virtual float get_frames_per_second() const { return _fps; }

	virtual void set_keep_screen_on(bool p_enabled);
	virtual bool is_keep_screen_on() const;
	virtual void set_low_processor_usage_mode(bool p_enabled);
	virtual bool is_in_low_processor_usage_mode() const;

	virtual String get_installed_templates_path() const { return ""; }
	virtual String get_executable_path() const;
	virtual Error execute(const String &p_path, const List<String> &p_arguments, bool p_blocking, ProcessID *r_child_id = NULL, String *r_pipe = NULL, int *r_exitcode = NULL, bool read_stderr = false) = 0;
	virtual Error kill(const ProcessID &p_pid) = 0;
	virtual int get_process_ID() const;

	virtual Error shell_open(String p_uri);
	virtual Error set_cwd(const String &p_cwd);

	virtual bool has_environment(const String &p_var) const = 0;
	virtual String get_environment(const String &p_var) const = 0;

	virtual String get_name() = 0;
	virtual List<String> get_cmdline_args() const { return _cmdline; }
	virtual String get_model_name() const;

	virtual MainLoop *get_main_loop() const = 0;

	String get_custom_level() const { return _custom_level; }

	virtual void yield();

	enum Weekday {
		DAY_SUNDAY,
		DAY_MONDAY,
		DAY_TUESDAY,
		DAY_WEDNESDAY,
		DAY_THURSDAY,
		DAY_FRIDAY,
		DAY_SATURDAY
	};

	enum Month {
		/// Start at 1 to follow Windows SYSTEMTIME structure
		/// https://msdn.microsoft.com/en-us/library/windows/desktop/ms724950(v=vs.85).aspx
		MONTH_JANUARY = 1,
		MONTH_FEBRUARY,
		MONTH_MARCH,
		MONTH_APRIL,
		MONTH_MAY,
		MONTH_JUNE,
		MONTH_JULY,
		MONTH_AUGUST,
		MONTH_SEPTEMBER,
		MONTH_OCTOBER,
		MONTH_NOVEMBER,
		MONTH_DECEMBER
	};

	struct Date {

		int year;
		Month month;
		int day;
		Weekday weekday;
		bool dst;
	};

	struct Time {

		int hour;
		int min;
		int sec;
	};

	struct TimeZoneInfo {
		int bias;
		String name;
	};

	virtual Date get_date(bool local = false) const = 0;
	virtual Time get_time(bool local = false) const = 0;
	virtual TimeZoneInfo get_time_zone_info() const = 0;
	virtual uint64_t get_unix_time() const;
	virtual uint64_t get_system_time_secs() const;

	virtual void delay_usec(uint32_t p_usec) const = 0;
	virtual uint64_t get_ticks_usec() const = 0;
	uint32_t get_ticks_msec() const;
	uint64_t get_splash_tick_msec() const;

	void set_frame_delay(uint32_t p_msec);
	uint32_t get_frame_delay() const;

	virtual bool can_draw() const = 0;

	uint64_t get_frames_drawn();

	bool is_stdout_verbose() const;

	virtual void disable_crash_handler() {}
	virtual bool is_disable_crash_handler() const { return false; }

	enum CursorShape {
		CURSOR_ARROW,
		CURSOR_IBEAM,
		CURSOR_POINTING_HAND,
		CURSOR_CROSS,
		CURSOR_WAIT,
		CURSOR_BUSY,
		CURSOR_DRAG,
		CURSOR_CAN_DROP,
		CURSOR_FORBIDDEN,
		CURSOR_VSIZE,
		CURSOR_HSIZE,
		CURSOR_BDIAGSIZE,
		CURSOR_FDIAGSIZE,
		CURSOR_MOVE,
		CURSOR_VSPLIT,
		CURSOR_HSPLIT,
		CURSOR_HELP,
		CURSOR_MAX
	};

	virtual bool has_virtual_keyboard() const;
	virtual void show_virtual_keyboard(const String &p_existing_text, const Rect2 &p_screen_rect = Rect2());
	virtual void hide_virtual_keyboard();

	virtual void set_cursor_shape(CursorShape p_shape) = 0;
	virtual void set_custom_mouse_cursor(const RES &p_cursor, CursorShape p_shape, const Vector2 &p_hotspot) = 0;

	virtual bool get_swap_ok_cancel() { return false; }
	virtual void dump_memory_to_file(const char *p_file);
	virtual void dump_resources_to_file(const char *p_file);
	virtual void print_resources_in_use(bool p_short = false);
	virtual void print_all_resources(String p_to_file = "");

	virtual int get_static_memory_usage() const;
	virtual int get_static_memory_peak_usage() const;
	virtual int get_dynamic_memory_usage() const;
	virtual int get_free_static_memory() const;

	RenderThreadMode get_render_thread_mode() const { return _render_thread_mode; }

	virtual String get_locale() const;

	String get_safe_application_name() const;
	virtual String get_data_dir() const;
	virtual String get_resource_dir() const;

	virtual Error move_path_to_trash(String p_dir) { return FAILED; }

	enum SystemDir {
		SYSTEM_DIR_DESKTOP,
		SYSTEM_DIR_DCIM,
		SYSTEM_DIR_DOCUMENTS,
		SYSTEM_DIR_DOWNLOADS,
		SYSTEM_DIR_MOVIES,
		SYSTEM_DIR_MUSIC,
		SYSTEM_DIR_PICTURES,
		SYSTEM_DIR_RINGTONES,
	};

	virtual String get_system_dir(SystemDir p_dir) const;

	virtual void set_no_window_mode(bool p_enable);
	virtual bool is_no_window_mode_enabled() const;

	virtual bool has_touchscreen_ui_hint() const;

	enum ScreenOrientation {

		SCREEN_LANDSCAPE,
		SCREEN_PORTRAIT,
		SCREEN_REVERSE_LANDSCAPE,
		SCREEN_REVERSE_PORTRAIT,
		SCREEN_SENSOR_LANDSCAPE,
		SCREEN_SENSOR_PORTRAIT,
		SCREEN_SENSOR,
	};

	virtual void set_screen_orientation(ScreenOrientation p_orientation);
	ScreenOrientation get_screen_orientation() const;

	virtual void enable_for_stealing_focus(ProcessID pid) {}
	virtual void move_window_to_foreground() {}

	virtual void debug_break();

	virtual void release_rendering_thread();
	virtual void make_rendering_thread();
	virtual void swap_buffers();

	virtual void set_icon(const Image &p_icon);

	virtual int get_exit_code() const;
	virtual void set_exit_code(int p_code);

	virtual int get_processor_count() const;

	virtual String get_unique_ID() const;

	virtual Error native_video_play(String p_path, float p_volume, String p_audio_track, String p_subtitle_track);
	virtual bool native_video_is_playing() const;
	virtual void native_video_pause();
	virtual void native_video_unpause();
	virtual void native_video_stop();

	virtual bool can_use_threads() const;

	virtual Error dialog_show(String p_title, String p_description, Vector<String> p_buttons, Object *p_obj, String p_callback);
	virtual Error dialog_input_text(String p_title, String p_description, String p_partial, Object *p_obj, String p_callback);

	enum LatinKeyboardVariant {
		LATIN_KEYBOARD_QWERTY,
		LATIN_KEYBOARD_QWERTZ,
		LATIN_KEYBOARD_AZERTY,
		LATIN_KEYBOARD_QZERTY,
		LATIN_KEYBOARD_DVORAK,
		LATIN_KEYBOARD_NEO,
		LATIN_KEYBOARD_COLEMAK,
	};

	virtual LatinKeyboardVariant get_latin_keyboard_variant() const;

	void set_time_scale(float p_scale);
	float get_time_scale() const;

	_FORCE_INLINE_ bool get_use_pixel_snap() const { return _pixel_snap; }

	virtual bool is_joy_known(int p_device);
	virtual String get_joy_guid(int p_device) const;

	enum EngineContext {
		CONTEXT_EDITOR,
		CONTEXT_PROJECTMAN,
	};

	virtual void set_context(int p_context);

	virtual void set_use_vsync(bool p_enable);
	virtual bool is_vsync_enabled() const;

	Dictionary get_engine_version() const;

	bool is_hidpi_allowed() const { return _allow_hidpi; }
	OS();
	virtual ~OS();
};

#endif