#pragma once

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

#ifdef __cplusplus
extern "C" {
#endif

typedef struct {
    int     dpi;
    LOGFONT lfMessageFont;
    HFONT   hMessageFont;
} ALFWindowFonts;

typedef struct {
    void (*create)(void * /*closure*/, HWND /*window*/);
    void (*destroy)(void * /*closure*/, HWND /*window*/);
    BOOL (*close)(void * /*closure*/, HWND /*window*/);
    void (*postdestroy)(void * /*closure*/);
    void (*updatefonts)(void * /*closure*/, HWND /*window*/, const ALFWindowFonts *fonts);
    LRESULT (*message)(void * /*closure*/, HWND, UINT, WPARAM, LPARAM);
    LRESULT (*command)(void * /*closure*/, HWND /*window*/, UINT /*sourceid*/, UINT /*notificationcode*/, LPARAM);
    LRESULT (*notify)(void * /*closure*/, HWND /*window*/, WPARAM /*sourceid*/, NMHDR *);
} ALFWindowVTable;

// layout flags
#define ALF_QUERYSIZE       0x01
#define ALF_HEXPAND         0x02
#define ALF_VEXPAND         0x04
#define ALF_MESSAGEFONT     0x08
#define ALF_APPLYSIZE       0x10

// messages
#define ALF_WM__BASE            0x2800
#define ALF_WM_QUERYSIZE        (ALF_WM__BASE + 1)
#define ALF_WM_APPLYLAYOUT      (ALF_WM__BASE + 2)
#define ALF_WM_UPDATEFONTS      (ALF_WM__BASE + 3)
#define ALF_WM_ADDWIDGET        (ALF_WM__BASE + 4)
#define ALF_WM_WIDGETBYID       (ALF_WM__BASE + 5)
#define ALF_WM_REMOVEWIDGET     (ALF_WM__BASE + 6)
#define ALF_WM_SETMODALRESULT   (ALF_WM__BASE + 7)
#define ALF_WM_GETMODALRESULT   (ALF_WM__BASE + 8)
#define ALF_WM_CENTIPOINTTOPX   (ALF_WM__BASE + 9)
#define ALF_WM_SETFOCUS         (ALF_WM__BASE + 10)
#define ALF_WM_GETAPPLICATION   (ALF_WM__BASE + 11)
#define ALF_WM_APPLYSIZE        (ALF_WM__BASE + 12)

typedef struct {
    const TCHAR    *className;
    UINT            classStyle;
    ALFWindowVTable vtbl;
} ALFWindowClassParams;

typedef struct {
    HWND    hwnd;
    UINT    x;
    UINT    y;
    UINT    width;
    UINT    height;
    DWORD   flags;
    UINT    margins[4];
} ALFAddWidgetParams;

typedef struct ALFAppPriv *ALFAPP;

typedef enum {
    ALF_DPI_AWARENESS_UNAWARE,
    ALF_DPI_AWARENESS_SYSTEM_AWARE,
    ALF_DPI_AWARENESS_PER_MONITOR_AWARE_V2
} ALFDpiAwareness;

void
ALF_SetDpiAwareness(ALFDpiAwareness awareness);

ALFAPP
ALF_CreateApplication(HINSTANCE hInstance);

void
ALF_TeardownApplication(ALFAPP app);

LPTSTR
ALF_RegisterWindowClass(ALFAPP app, const ALFWindowClassParams *params);

void
ALF_UnregisterWindowClass(ALFAPP app, LPCTSTR className);

HWND
ALF_InstantiateWindow(ALFAPP app, LPCTSTR className, HWND hwndParent, void *closure);

ALFAPP
ALF_ApplicationFromWindow(HWND hwnd);

int
ALF_CentipointsToPixels(HWND win, int cptValue);

LRESULT
ALF_DefWindowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam);

HWND
ALF_AddLabel(HWND win, WORD id, UINT x, UINT y, const WCHAR *text);

HWND
ALF_AddEdit(HWND win, WORD id, UINT x, UINT y, const WCHAR *text);

HWND
ALF_AddButton(HWND win, WORD id, UINT x, UINT y, const WCHAR *text);

void
ALF_SetDefaultButton(HWND win, WORD id);

void
ALF_DestroyWidget(HWND win, WORD id);

void
ALF_AddWidget(HWND win, UINT x, UINT y, HWND widget, UINT cptWidth, UINT cptHeight, DWORD flags);

void
ALF_AddWidgetEx(HWND win, const ALFAddWidgetParams *params);

HWND
ALF_WidgetHwndById(HWND win, WORD id);

void
ALF_RecalculateLayout(HWND win);

void
ALF_UpdateFonts(HWND win);

void
ALF_ResizeWindow(HWND win, int cptWidth, int cptHeight);

void
ALF_ResizeWindowPx(HWND win, int pxWidth, int pxHeight);

int
ALF_ShowModal(HWND win);

void
ALF_SetModalResult(HWND win, int result);

int
ALF_GetModalResult(HWND win);

#ifdef __cplusplus
} // extern C
#endif