#ifndef BREEZE_UI_CORE_H
#define BREEZE_UI_CORE_H

#include "../defines.h"

#include <raylib.h>

typedef enum BzUISizeKind {
    BZ_UI_SIZE_NULL,
    BZ_UI_SIZE_PIXELS,
    BZ_UI_SIZE_FIT,
    BZ_UI_SIZE_REL_PARENT,
} BzUISizeKind;

typedef struct BzUISize {
    BzUISizeKind kind;
    f32 value;
} BzUISize;

typedef enum BzUIAxis {
    BZ_UI_AXIS_X,
    BZ_UI_AXIS_Y,
    BZ_UI_AXIS_COUNT,
} BzUIAxis;

typedef u32 BzUIWidgetFlags;
enum {
    BZ_UI_WIDGET_CLICKABLE   = (1 << 0),
    BZ_UI_WIDGET_VIEW_SCROLL = (1 << 1),
    BZ_UI_WIDGET_DRAW_TEXT   = (1 << 2),
    BZ_UI_WIDGET_DRAW_BORDER = (1 << 3),
};

typedef u32 BzUIKey;

typedef struct BzUIWidget BzUIWidget;
typedef struct BzUIWidget {
    BzUIWidget *first;
    BzUIWidget *last;
    BzUIWidget *next;
    BzUIWidget *prev;
    BzUIWidget *parent;

    // Key+generation info
    BzUIKey key;
    u64 lastFrameTouchedIndex;

    // Per-frame info provided by builders
    BzUIWidgetFlags flags;
    const char *string;
    BzUISize semanticSize[BZ_UI_AXIS_COUNT];

    // recomputed every frame
    f32 computedRelPosition[BZ_UI_AXIS_COUNT];
    f32 computedSize[BZ_UI_AXIS_COUNT];
    Rectangle rect;
} BzUIWidget;

typedef struct BzUIResult {
    BzUIWidget *widget;
    bool pressed;
    bool released;
    //bool dragging;
    bool hovering;
} BzUIResult;

typedef struct BzUIWidgetDesc {
    BzUIWidgetFlags flags;
    const char *string;
    BzUIKey key;

} BzUIWidgetDesc;

typedef struct BzUI BzUI;

BzUIKey bzUIKeyNull();
BzUIKey bzUIKeyFromString(const char *str);

BzUI *bzUICreate();
void  bzUIDestroy(BzUI *ui);

void bzUIBegin(BzUI *ui, i32 width, i32 height);
void bzUIEnd(BzUI *ui);

// Widget construction

BzUIWidget *bzUIWidgetMake(const BzUIWidgetDesc *desc);

BzUIWidget *bzUIPushParent(BzUIWidget *widget);
BzUIWidget *bzUIPopParent();

BzUIResult bzUIGetResult(BzUIWidget *widget);

// UI

bool bzUIButton(const char *string);

#endif //BREEZE_UI_CORE_H