/*************************************************************************/
/*  core_bind.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).   */
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/* 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:                                             */
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/* 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  */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
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/*************************************************************************/

#ifndef CORE_BIND_H
#define CORE_BIND_H

#include "core/image.h"
#include "core/io/compression.h"
#include "core/io/resource_loader.h"
#include "core/io/resource_saver.h"
#include "core/os/dir_access.h"
#include "core/os/file_access.h"
#include "core/os/os.h"
#include "core/os/semaphore.h"
#include "core/os/thread.h"

class _ResourceLoader : public Object {
	GDCLASS(_ResourceLoader, Object);

protected:
	static void _bind_methods();
	static _ResourceLoader *singleton;

public:
	enum ThreadLoadStatus {
		THREAD_LOAD_INVALID_RESOURCE,
		THREAD_LOAD_IN_PROGRESS,
		THREAD_LOAD_FAILED,
		THREAD_LOAD_LOADED
	};

	static _ResourceLoader *get_singleton() { return singleton; }

	Error load_threaded_request(const String &p_path, const String &p_type_hint = "", bool p_use_sub_threads = false);
	ThreadLoadStatus load_threaded_get_status(const String &p_path, Array r_progress = Array());
	RES load_threaded_get(const String &p_path);

	RES load(const String &p_path, const String &p_type_hint = "", bool p_no_cache = false);
	Vector<String> get_recognized_extensions_for_type(const String &p_type);
	void set_abort_on_missing_resources(bool p_abort);
	PackedStringArray get_dependencies(const String &p_path);
	bool has_cached(const String &p_path);
	bool exists(const String &p_path, const String &p_type_hint = "");

	_ResourceLoader() { singleton = this; }
};

VARIANT_ENUM_CAST(_ResourceLoader::ThreadLoadStatus);

class _ResourceSaver : public Object {
	GDCLASS(_ResourceSaver, Object);

protected:
	static void _bind_methods();
	static _ResourceSaver *singleton;

public:
	enum SaverFlags {

		FLAG_RELATIVE_PATHS = 1,
		FLAG_BUNDLE_RESOURCES = 2,
		FLAG_CHANGE_PATH = 4,
		FLAG_OMIT_EDITOR_PROPERTIES = 8,
		FLAG_SAVE_BIG_ENDIAN = 16,
		FLAG_COMPRESS = 32,
		FLAG_REPLACE_SUBRESOURCE_PATHS = 64,
	};

	static _ResourceSaver *get_singleton() { return singleton; }

	Error save(const String &p_path, const RES &p_resource, SaverFlags p_flags);
	Vector<String> get_recognized_extensions(const RES &p_resource);

	_ResourceSaver() { singleton = this; }
};

VARIANT_ENUM_CAST(_ResourceSaver::SaverFlags);

class MainLoop;

class _OS : public Object {
	GDCLASS(_OS, Object);

protected:
	static void _bind_methods();
	static _OS *singleton;

public:
	enum VideoDriver {
		VIDEO_DRIVER_GLES2,
		VIDEO_DRIVER_VULKAN,
	};

	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
	};

	virtual PackedStringArray get_connected_midi_inputs();
	virtual void open_midi_inputs();
	virtual void close_midi_inputs();

	void set_low_processor_usage_mode(bool p_enabled);
	bool is_in_low_processor_usage_mode() const;

	void set_low_processor_usage_mode_sleep_usec(int p_usec);
	int get_low_processor_usage_mode_sleep_usec() const;

	String get_executable_path() const;
	int execute(const String &p_path, const Vector<String> &p_arguments, bool p_blocking = true, Array p_output = Array(), bool p_read_stderr = false);

	Error kill(int p_pid);
	Error shell_open(String p_uri);

	int get_process_id() const;

	bool has_environment(const String &p_var) const;
	String get_environment(const String &p_var) const;

	String get_name() const;
	Vector<String> get_cmdline_args();

	String get_locale() const;

	String get_model_name() const;

	void dump_memory_to_file(const String &p_file);
	void dump_resources_to_file(const String &p_file);

	void print_resources_in_use(bool p_short = false);
	void print_all_resources(const String &p_to_file);
	void print_all_textures_by_size();
	void print_resources_by_type(const Vector<String> &p_types);

	bool is_debug_build() const;

	String get_unique_id() const;

	String get_keycode_string(uint32_t p_code) const;
	bool is_keycode_unicode(uint32_t p_unicode) const;
	int find_keycode_from_string(const String &p_code) const;

	void set_use_file_access_save_and_swap(bool p_enable);

	int get_exit_code() const;
	void set_exit_code(int p_code);
	Dictionary get_date(bool utc) const;
	Dictionary get_time(bool utc) const;
	Dictionary get_datetime(bool utc) const;
	Dictionary get_datetime_from_unix_time(int64_t unix_time_val) const;
	int64_t get_unix_time_from_datetime(Dictionary datetime) const;
	Dictionary get_time_zone_info() const;
	uint64_t get_unix_time() const;
	uint64_t get_system_time_secs() const;
	uint64_t get_system_time_msecs() const;

	uint64_t get_static_memory_usage() const;
	uint64_t get_static_memory_peak_usage() const;

	void delay_usec(uint32_t p_usec) const;
	void delay_msec(uint32_t p_msec) const;
	uint32_t get_ticks_msec() const;
	uint64_t get_ticks_usec() const;
	uint32_t get_splash_tick_msec() const;

	bool can_use_threads() const;

	bool is_userfs_persistent() const;

	bool is_stdout_verbose() const;

	int get_processor_count() const;

	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,
	};

	String get_system_dir(SystemDir p_dir) const;

	String get_user_data_dir() const;

	Error set_thread_name(const String &p_name);

	bool has_feature(const String &p_feature) const;

	bool request_permission(const String &p_name);
	bool request_permissions();
	Vector<String> get_granted_permissions() const;

	static _OS *get_singleton() { return singleton; }

	_OS() { singleton = this; }
};

VARIANT_ENUM_CAST(_OS::VideoDriver);
VARIANT_ENUM_CAST(_OS::Weekday);
VARIANT_ENUM_CAST(_OS::Month);
VARIANT_ENUM_CAST(_OS::SystemDir);

class _Geometry : public Object {
	GDCLASS(_Geometry, Object);

	static _Geometry *singleton;

protected:
	static void _bind_methods();

public:
	static _Geometry *get_singleton();
	Vector<Plane> build_box_planes(const Vector3 &p_extents);
	Vector<Plane> build_cylinder_planes(float p_radius, float p_height, int p_sides, Vector3::Axis p_axis = Vector3::AXIS_Z);
	Vector<Plane> build_capsule_planes(float p_radius, float p_height, int p_sides, int p_lats, Vector3::Axis p_axis = Vector3::AXIS_Z);
	Variant segment_intersects_segment_2d(const Vector2 &p_from_a, const Vector2 &p_to_a, const Vector2 &p_from_b, const Vector2 &p_to_b);
	Variant line_intersects_line_2d(const Vector2 &p_from_a, const Vector2 &p_dir_a, const Vector2 &p_from_b, const Vector2 &p_dir_b);
	Vector<Vector2> get_closest_points_between_segments_2d(const Vector2 &p1, const Vector2 &q1, const Vector2 &p2, const Vector2 &q2);
	Vector<Vector3> get_closest_points_between_segments(const Vector3 &p1, const Vector3 &p2, const Vector3 &q1, const Vector3 &q2);
	Vector2 get_closest_point_to_segment_2d(const Vector2 &p_point, const Vector2 &p_a, const Vector2 &p_b);
	Vector3 get_closest_point_to_segment(const Vector3 &p_point, const Vector3 &p_a, const Vector3 &p_b);
	Vector2 get_closest_point_to_segment_uncapped_2d(const Vector2 &p_point, const Vector2 &p_a, const Vector2 &p_b);
	Vector3 get_closest_point_to_segment_uncapped(const Vector3 &p_point, const Vector3 &p_a, const Vector3 &p_b);
	Variant ray_intersects_triangle(const Vector3 &p_from, const Vector3 &p_dir, const Vector3 &p_v0, const Vector3 &p_v1, const Vector3 &p_v2);
	Variant segment_intersects_triangle(const Vector3 &p_from, const Vector3 &p_to, const Vector3 &p_v0, const Vector3 &p_v1, const Vector3 &p_v2);
	bool point_is_inside_triangle(const Vector2 &s, const Vector2 &a, const Vector2 &b, const Vector2 &c) const;

	Vector<Vector3> segment_intersects_sphere(const Vector3 &p_from, const Vector3 &p_to, const Vector3 &p_sphere_pos, real_t p_sphere_radius);
	Vector<Vector3> segment_intersects_cylinder(const Vector3 &p_from, const Vector3 &p_to, float p_height, float p_radius);
	Vector<Vector3> segment_intersects_convex(const Vector3 &p_from, const Vector3 &p_to, const Vector<Plane> &p_planes);
	bool is_point_in_circle(const Vector2 &p_point, const Vector2 &p_circle_pos, real_t p_circle_radius);
	real_t segment_intersects_circle(const Vector2 &p_from, const Vector2 &p_to, const Vector2 &p_circle_pos, real_t p_circle_radius);
	int get_uv84_normal_bit(const Vector3 &p_vector);

	bool is_polygon_clockwise(const Vector<Vector2> &p_polygon);
	bool is_point_in_polygon(const Point2 &p_point, const Vector<Vector2> &p_polygon);
	Vector<int> triangulate_polygon(const Vector<Vector2> &p_polygon);
	Vector<int> triangulate_delaunay_2d(const Vector<Vector2> &p_points);
	Vector<Point2> convex_hull_2d(const Vector<Point2> &p_points);
	Vector<Vector3> clip_polygon(const Vector<Vector3> &p_points, const Plane &p_plane);

	enum PolyBooleanOperation {
		OPERATION_UNION,
		OPERATION_DIFFERENCE,
		OPERATION_INTERSECTION,
		OPERATION_XOR
	};
	// 2D polygon boolean operations.
	Array merge_polygons_2d(const Vector<Vector2> &p_polygon_a, const Vector<Vector2> &p_polygon_b); // Union (add).
	Array clip_polygons_2d(const Vector<Vector2> &p_polygon_a, const Vector<Vector2> &p_polygon_b); // Difference (subtract).
	Array intersect_polygons_2d(const Vector<Vector2> &p_polygon_a, const Vector<Vector2> &p_polygon_b); // Common area (multiply).
	Array exclude_polygons_2d(const Vector<Vector2> &p_polygon_a, const Vector<Vector2> &p_polygon_b); // All but common area (xor).

	// 2D polyline vs polygon operations.
	Array clip_polyline_with_polygon_2d(const Vector<Vector2> &p_polyline, const Vector<Vector2> &p_polygon); // Cut.
	Array intersect_polyline_with_polygon_2d(const Vector<Vector2> &p_polyline, const Vector<Vector2> &p_polygon); // Chop.

	// 2D offset polygons/polylines.
	enum PolyJoinType {
		JOIN_SQUARE,
		JOIN_ROUND,
		JOIN_MITER
	};
	enum PolyEndType {
		END_POLYGON,
		END_JOINED,
		END_BUTT,
		END_SQUARE,
		END_ROUND
	};
	Array offset_polygon_2d(const Vector<Vector2> &p_polygon, real_t p_delta, PolyJoinType p_join_type = JOIN_SQUARE);
	Array offset_polyline_2d(const Vector<Vector2> &p_polygon, real_t p_delta, PolyJoinType p_join_type = JOIN_SQUARE, PolyEndType p_end_type = END_SQUARE);

	Dictionary make_atlas(const Vector<Size2> &p_rects);

	_Geometry() { singleton = this; }
};

VARIANT_ENUM_CAST(_Geometry::PolyBooleanOperation);
VARIANT_ENUM_CAST(_Geometry::PolyJoinType);
VARIANT_ENUM_CAST(_Geometry::PolyEndType);

class _File : public Reference {
	GDCLASS(_File, Reference);

	FileAccess *f = nullptr;
	bool eswap = false;

protected:
	static void _bind_methods();

public:
	enum ModeFlags {

		READ = 1,
		WRITE = 2,
		READ_WRITE = 3,
		WRITE_READ = 7,
	};

	enum CompressionMode {
		COMPRESSION_FASTLZ = Compression::MODE_FASTLZ,
		COMPRESSION_DEFLATE = Compression::MODE_DEFLATE,
		COMPRESSION_ZSTD = Compression::MODE_ZSTD,
		COMPRESSION_GZIP = Compression::MODE_GZIP
	};

	Error open_encrypted(const String &p_path, ModeFlags p_mode_flags, const Vector<uint8_t> &p_key);
	Error open_encrypted_pass(const String &p_path, ModeFlags p_mode_flags, const String &p_pass);
	Error open_compressed(const String &p_path, ModeFlags p_mode_flags, CompressionMode p_compress_mode = COMPRESSION_FASTLZ);

	Error open(const String &p_path, ModeFlags p_mode_flags); // open a file.
	void close(); // Close a file.
	bool is_open() const; // True when file is open.

	String get_path() const; // Returns the path for the current open file.
	String get_path_absolute() const; // Returns the absolute path for the current open file.

	void seek(int64_t p_position); // Seek to a given position.
	void seek_end(int64_t p_position = 0); // Seek from the end of file.
	int64_t get_position() const; // Get position in the file.
	int64_t get_len() const; // Get size of the file.

	bool eof_reached() const; // Reading passed EOF.

	uint8_t get_8() const; // Get a byte.
	uint16_t get_16() const; // Get 16 bits uint.
	uint32_t get_32() const; // Get 32 bits uint.
	uint64_t get_64() const; // Get 64 bits uint.

	float get_float() const;
	double get_double() const;
	real_t get_real() const;

	Variant get_var(bool p_allow_objects = false) const;

	Vector<uint8_t> get_buffer(int p_length) const; // Get an array of bytes.
	String get_line() const;
	Vector<String> get_csv_line(const String &p_delim = ",") const;
	String get_as_text() const;
	String get_md5(const String &p_path) const;
	String get_sha256(const String &p_path) const;

	/* Use this for files WRITTEN in _big_ endian machines (ie, amiga/mac).
	 * It's not about the current CPU type but file formats.
	 * This flags get reset to false (little endian) on each open.
	 */

	void set_endian_swap(bool p_swap);
	bool get_endian_swap();

	Error get_error() const; // Get last error.

	void store_8(uint8_t p_dest); // Store a byte.
	void store_16(uint16_t p_dest); // Store 16 bits uint.
	void store_32(uint32_t p_dest); // Store 32 bits uint.
	void store_64(uint64_t p_dest); // Store 64 bits uint.

	void store_float(float p_dest);
	void store_double(double p_dest);
	void store_real(real_t p_real);

	void store_string(const String &p_string);
	void store_line(const String &p_string);
	void store_csv_line(const Vector<String> &p_values, const String &p_delim = ",");

	virtual void store_pascal_string(const String &p_string);
	virtual String get_pascal_string();

	void store_buffer(const Vector<uint8_t> &p_buffer); // Store an array of bytes.

	void store_var(const Variant &p_var, bool p_full_objects = false);

	bool file_exists(const String &p_name) const; // Return true if a file exists.

	uint64_t get_modified_time(const String &p_file) const;

	_File() {}
	virtual ~_File();
};

VARIANT_ENUM_CAST(_File::ModeFlags);
VARIANT_ENUM_CAST(_File::CompressionMode);

class _Directory : public Reference {
	GDCLASS(_Directory, Reference);
	DirAccess *d;

protected:
	static void _bind_methods();

public:
	Error open(const String &p_path);

	Error list_dir_begin(bool p_skip_navigational = false, bool p_skip_hidden = false); // This starts dir listing.
	String get_next();
	bool current_is_dir() const;

	void list_dir_end();

	int get_drive_count();
	String get_drive(int p_drive);
	int get_current_drive();

	Error change_dir(String p_dir); // Can be relative or absolute, return false on success.
	String get_current_dir(); // Return current dir location.

	Error make_dir(String p_dir);
	Error make_dir_recursive(String p_dir);

	bool file_exists(String p_file);
	bool dir_exists(String p_dir);

	int get_space_left();

	Error copy(String p_from, String p_to);
	Error rename(String p_from, String p_to);
	Error remove(String p_name);

	_Directory();
	virtual ~_Directory();

private:
	bool _list_skip_navigational;
	bool _list_skip_hidden;
};

class _Marshalls : public Object {
	GDCLASS(_Marshalls, Object);

	static _Marshalls *singleton;

protected:
	static void _bind_methods();

public:
	static _Marshalls *get_singleton();

	String variant_to_base64(const Variant &p_var, bool p_full_objects = false);
	Variant base64_to_variant(const String &p_str, bool p_allow_objects = false);

	String raw_to_base64(const Vector<uint8_t> &p_arr);
	Vector<uint8_t> base64_to_raw(const String &p_str);

	String utf8_to_base64(const String &p_str);
	String base64_to_utf8(const String &p_str);

	_Marshalls() { singleton = this; }
	~_Marshalls() { singleton = nullptr; }
};

class _Mutex : public Reference {
	GDCLASS(_Mutex, Reference);
	Mutex mutex;

	static void _bind_methods();

public:
	void lock();
	Error try_lock();
	void unlock();
};

class _Semaphore : public Reference {
	GDCLASS(_Semaphore, Reference);
	Semaphore semaphore;

	static void _bind_methods();

public:
	void wait();
	Error try_wait();
	void post();
};

class _Thread : public Reference {
	GDCLASS(_Thread, Reference);

protected:
	Variant ret;
	Variant userdata;
	volatile bool active = false;
	Object *target_instance = nullptr;
	StringName target_method;
	Thread *thread = nullptr;
	static void _bind_methods();
	static void _start_func(void *ud);

public:
	enum Priority {

		PRIORITY_LOW,
		PRIORITY_NORMAL,
		PRIORITY_HIGH,
		PRIORITY_MAX
	};

	Error start(Object *p_instance, const StringName &p_method, const Variant &p_userdata = Variant(), Priority p_priority = PRIORITY_NORMAL);
	String get_id() const;
	bool is_active() const;
	Variant wait_to_finish();

	_Thread() {}
	~_Thread();
};

VARIANT_ENUM_CAST(_Thread::Priority);

class _ClassDB : public Object {
	GDCLASS(_ClassDB, Object);

protected:
	static void _bind_methods();

public:
	PackedStringArray get_class_list() const;
	PackedStringArray get_inheriters_from_class(const StringName &p_class) const;
	StringName get_parent_class(const StringName &p_class) const;
	bool class_exists(const StringName &p_class) const;
	bool is_parent_class(const StringName &p_class, const StringName &p_inherits) const;
	bool can_instance(const StringName &p_class) const;
	Variant instance(const StringName &p_class) const;

	bool has_signal(StringName p_class, StringName p_signal) const;
	Dictionary get_signal(StringName p_class, StringName p_signal) const;
	Array get_signal_list(StringName p_class, bool p_no_inheritance = false) const;

	Array get_property_list(StringName p_class, bool p_no_inheritance = false) const;
	Variant get_property(Object *p_object, const StringName &p_property) const;
	Error set_property(Object *p_object, const StringName &p_property, const Variant &p_value) const;

	bool has_method(StringName p_class, StringName p_method, bool p_no_inheritance = false) const;

	Array get_method_list(StringName p_class, bool p_no_inheritance = false) const;

	PackedStringArray get_integer_constant_list(const StringName &p_class, bool p_no_inheritance = false) const;
	bool has_integer_constant(const StringName &p_class, const StringName &p_name) const;
	int get_integer_constant(const StringName &p_class, const StringName &p_name) const;
	StringName get_category(const StringName &p_node) const;

	bool is_class_enabled(StringName p_class) const;

	_ClassDB() {}
	~_ClassDB() {}
};

class _Engine : public Object {
	GDCLASS(_Engine, Object);

protected:
	static void _bind_methods();
	static _Engine *singleton;

public:
	static _Engine *get_singleton() { return singleton; }
	void set_iterations_per_second(int p_ips);
	int get_iterations_per_second() const;

	void set_physics_jitter_fix(float p_threshold);
	float get_physics_jitter_fix() const;
	float get_physics_interpolation_fraction() const;

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

	float get_frames_per_second() const;
	uint64_t get_physics_frames() const;
	uint64_t get_idle_frames() const;

	int get_frames_drawn();

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

	MainLoop *get_main_loop() const;

	Dictionary get_version_info() const;
	Dictionary get_author_info() const;
	Array get_copyright_info() const;
	Dictionary get_donor_info() const;
	Dictionary get_license_info() const;
	String get_license_text() const;

	bool is_in_physics_frame() const;

	bool has_singleton(const String &p_name) const;
	Object *get_singleton_object(const String &p_name) const;

	void set_editor_hint(bool p_enabled);
	bool is_editor_hint() const;

	_Engine() { singleton = this; }
};

class _JSON;

class JSONParseResult : public Reference {
	GDCLASS(JSONParseResult, Reference);

	friend class _JSON;

	Error error;
	String error_string;
	int error_line = -1;

	Variant result;

protected:
	static void _bind_methods();

public:
	void set_error(Error p_error);
	Error get_error() const;

	void set_error_string(const String &p_error_string);
	String get_error_string() const;

	void set_error_line(int p_error_line);
	int get_error_line() const;

	void set_result(const Variant &p_result);
	Variant get_result() const;

	JSONParseResult() {}
};

class _JSON : public Object {
	GDCLASS(_JSON, Object);

protected:
	static void _bind_methods();
	static _JSON *singleton;

public:
	static _JSON *get_singleton() { return singleton; }

	String print(const Variant &p_value, const String &p_indent = "", bool p_sort_keys = false);
	Ref<JSONParseResult> parse(const String &p_json);

	_JSON() { singleton = this; }
};

#endif // CORE_BIND_H