#pragma once

#include<stdint.h>
#include<stdlib.h>
#include<stdbool.h>
#include<stddef.h>

struct k3Font;
struct k3MObj;

#define k3M_EVENT_MOUSE_ENTER 0
#define k3M_EVENT_MOUSE_MOTION 1
#define k3M_EVENT_MOUSE_LEAVE 2
#define k3M_EVENT_MOUSE_PRESS 3
#define k3M_EVENT_MOUSE_RELEASE 4
#define k3M_EVENT_MOUSE_CLICK 5
#define k3M_EVENT_KEY_PRESS 6
#define k3M_EVENT_KEY_RELEASE 7
#define k3M_EVENT_INPUT 8
#define k3M_EVENT_DRAW 9
#define k3M_EVENT_COMPLETE 10
#define k3M_EVENT_MEASURE 11
#define k3M_EVENT_ARRANGE 12
#define k3M_EVENT_POST_ARRANGE 13
#define k3M_EVENT_SET_HEIGHT_FROM_WIDTH 14
#define k3M_EVENT_ALL 15

#define k3M_MOUSE_BUTTON_0 0
#define k3M_MOUSE_BUTTON_1 1
#define k3M_MOUSE_BUTTON_2 2

#define k3M_EVENTKIND_DIRECT 0
#define k3M_EVENTKIND_CAPTURE 1
#define k3M_EVENTKIND_BUBBLE 2

#define k3M_USERDATA_SIZE 32

#define k3M_ALIGN_LEFT 0
#define k3M_ALIGN_TOP 3
#define k3M_ALIGN_CENTER 1
#define k3M_ALIGN_RIGHT 2
#define k3M_ALIGN_BOTTOM 4

#define k3M_IDX_TOP 0
#define k3M_IDX_RIGHT 1
#define k3M_IDX_BOTTOM 2
#define k3M_IDX_LEFT 3

#ifdef k3M_FIXED_POINT
typedef uint8_t k3MCC;
#else
typedef float k3MCC;
#endif

#define k3M_UNIT_ABSOLUTE 0
#define k3M_UNIT_PROPORTION 1

#include"k3menu_internal.h"

struct k3MEvent {
	uint16_t code;
	
	uint8_t kind;
	
	struct k3MObj *original;
	struct k3MObj *target;
	
	union {
		struct {
			int button;
			int16_t x;
			int16_t y;
		} mouse;
		struct {
			uint32_t num;
		} key;
		struct {
			uint32_t code;
		} input;
	};
};

typedef bool(*k3MEventHandlerFunc)(struct k3MEvent*, uint8_t *ud);

typedef struct k3MEventHandler {
	uint8_t ud[k3M_USERDATA_SIZE];
	k3MEventHandlerFunc callback;
	uint16_t code;
} k3MEventHandler;

enum k3MPropertyType {
	k3M_PROP_BG_COLOR,
	k3M_PROP_FG_COLOR,
	k3M_PROP_BORDER_RADIUS,
	k3M_PROP_MARGIN,
	k3M_PROP_PADDING,
	k3M_PROP_HORIZONTAL_ALIGNMENT,
	k3M_PROP_VERTICAL_ALIGNMENT,
	k3M_PROP_LEFT,
	k3M_PROP_TOP,
	k3M_PROP_WIDTH,
	k3M_PROP_HEIGHT,
	k3M_PROP_FONT_SIZE,
	k3M_PROP_SCROLL_ANYWHERE,
	k3M_PROP_SCROLLBAR_SIZE,
};
struct k3MProperty {
	enum k3MPropertyType type;
	uint8_t units[4];
	union {
		intmax_t si[4];
		void *ptr[4];
		uint8_t buf[32];
		float f[4];
	};
};

struct k3MObj {
	struct k3MObj *parent;
	
	size_t childCount;
	struct k3MObj **children;
	
	int16_t x;
	int16_t y;
	int16_t w;
	int16_t h;
	
	int16_t wDesired;
	int16_t hDesired;
	
	bool invisible, hovered, disabled, crop;
	
	k3MEventHandler *handlers;
	size_t handlerCount;
	
	struct k3MProperty *properties;
	size_t propertyCount;
};
struct k3MObj *k3MObj();

/* Akin to the measure pass of WPF. Recursive, called by parent. Sets wDesired and hDesired. */
void k3MMeasure(struct k3MObj *this);

/* Akin to the arrange pass of WPF. Recursive, called by parent after w and h is set. Adjusts all children using it's own definitive size. */
void k3MArrange(struct k3MObj *this);

/* Set linear layout management on this object. Must not be called on descendants of k3MObj. */
void k3MSetLayoutLinear(struct k3MObj *this, bool vertical);

#define k3MenuSetBounds(a, x, y, w, h) k3MenuSetBounds_((struct k3MObj*) (a), (x), (y), (w), (h))
void k3MenuSetBounds_(struct k3MObj *this, int16_t x, int16_t y, int16_t w, int16_t h);

#define k3MRegisterEventHandler(a, c, cb, ud, udsz) k3MRegisterEventHandler_((struct k3MObj*) (a), (c), (cb), (ud), (udsz))
int k3MRegisterEventHandler_(struct k3MObj *obj, uint16_t evcode, k3MEventHandlerFunc callback, uint8_t *ud, size_t udSize);

bool k3MEventSend(struct k3MEvent *ev);

int k3MRemoveChild(struct k3MObj *parent, struct k3MObj *child);
void k3MAddChild(struct k3MObj *parent, struct k3MObj *child);

void k3MOverrideProperty(struct k3MObj *obj, struct k3MProperty);
struct k3MProperty *k3MFindProperty(struct k3MObj *obj, enum k3MPropertyType, bool direct);

struct k3MLabel {
	struct k3MObj;
	
	struct k3Font *font;
	float sz;
	char *txt;
};
struct k3MLabel *k3MLabel(struct k3Font *font, float sz, const char *txt);

struct k3MScreen {
	struct k3MObj;
	
	struct k3MObj *keyboardFocus;
	struct k3MObj *lastHover;
	
	struct k3MObj *mouseCapture;
};
struct k3MScreen *k3MScreen();
bool k3MCaptureMouse(struct k3MScreen*, struct k3MObj*);
void k3MReleaseMouse(struct k3MScreen*);

struct k3MTextButton {
	struct k3MObj;
	
	struct k3Font *font;
	float sz;
	char *txt;
};
struct k3MTextButton *k3MTextButton(struct k3Font *font, float sz, const char *txt);

struct k3MTextInput {
	struct k3MObj;
	
	struct k3Font *font;
	float sz;
	
	char *placeholder;
	
	char *txt;
};
struct k3MTextInput *k3MTextInput(struct k3Font *font, float sz, const char *placeholder, const char *txt);

struct k3MImage {
	struct k3MObj;
	
	k3MImageData data;
};
struct k3MImage *k3MImage(k3MImageData);

struct k3MScrollbox {
	struct k3MObj;
	
	int mouseHeld;
	int16_t mouseX;
	int16_t mouseY;
	
	float scrollbarOffset;
	int16_t scrollbarLength;
};
struct k3MScrollbox *k3MScrollbox();
struct k3MObj *k3MScrollboxGetContent(struct k3MScrollbox*);