#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 (*applyfonts)(void * /*closure*/, HWND /*window*/, const ALFWindowFonts *fonts);
    LRESULT (*message)(void * /*closure*/, HWND, UINT, WPARAM, LPARAM);
    LRESULT (*command)(void * /*closure*/, HWND /*window*/, WORD /*notificationcode*/, WORD /*sourceid*/, HWND /*control*/);
    LRESULT (*notify)(void * /*closure*/, HWND /*window*/, WPARAM /*sourceid*/, NMHDR *);
} ALFWindowVTable;

// layout flags
#define ALF_QUERYSIZE       0x01
#define ALF_APPLYSIZE       0x02
#define ALF_HEXPAND         0x04
#define ALF_VEXPAND         0x08
#define ALF_MESSAGEFONT     0x10
#define ALF_STATUSFONT      0x20
#define ALF_ICONTITLEFONT   0x40
// special value, means "send ALF_WM_APPLYFONTS message with full fonts struct"
#define ALF_ALLFONTS        (ALF_MESSAGEFONT | ALF_STATUSFONT | ALF_ICONTITLEFONT)

// 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)
#define ALF_WM_GETLAYOUTPARAMS  (ALF_WM__BASE + 13)
#define ALF_WM_SETLAYOUTPARAMS  (ALF_WM__BASE + 14)
#define ALF_WM_GETWIDGETATPOS   (ALF_WM__BASE + 15)
#define ALF_WM_APPLYFONTS       (ALF_WM__BASE + 16)

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];
} ALFWidgetLayoutParams;

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);

void
ALF_DestroyWindow(HWND win);

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 TCHAR *text);

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

HWND
ALF_AddButton(HWND win, WORD id, UINT x, UINT y, const TCHAR *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 ALFWidgetLayoutParams *params);

HWND
ALF_WidgetHwndById(HWND win, WORD id);

void
ALF_RecalculateLayout(HWND win);

// Recalculates the window's DPI and all fonts and applies them to child widgets.
// ALF does this automatically on a DPI or settings change so you shouldn't have
// to call ALF_UpdateFonts(). If you have added new widgets and want to set their
// fonts, call ALF_ApplyFonts() instead.
//
// Since widget sizes depend on the assigned font, you should probably
// call ALF_RecalculateLayout() afterwards.
void
ALF_UpdateFonts(HWND win);

// Applies window fonts to all children (depending on their layout flags).
// also calls the applyfonts() virtual function.
//
// Call this after you have added new child widgets.
// Since widget sizes depend on the assigned font, you should probably
// call ALF_RecalculateLayout() afterwards.
void
ALF_ApplyFonts(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);

void
ALF_SetText(HWND hwnd, const TCHAR *text);

void
ALF_SetWidgetText(HWND parent, WORD id, const TCHAR *text);

TCHAR * // free with HeapFree
ALF_Text(HWND hwnd);

TCHAR * // free with HeapFree
ALF_WidgetText(HWND parent, WORD id);

DWORD
ALF_WidgetLayoutFlags(HWND parent, HWND widget);

BOOL
ALF_SetWidgetLayoutFlags(HWND parent, HWND widget, DWORD flags);

static inline void
ALF_AddWidgetLayoutFlag(HWND parent, HWND widget, DWORD flag)
{
    ALF_SetWidgetLayoutFlags(parent, widget, ALF_WidgetLayoutFlags(parent, widget) | flag);
}

static inline void
ALF_RemoveWidgetLayoutFlag(HWND parent, HWND widget, DWORD flag)
{
    ALF_SetWidgetLayoutFlags(parent, widget, ALF_WidgetLayoutFlags(parent, widget) & ~flag);
}

BOOL
ALF_WidgetLayoutPosition(HWND parent, HWND widget, UINT *pX, UINT *pY);

BOOL
ALF_SetWidgetLayoutPosition(HWND parent, HWND widget, UINT x, UINT y);

BOOL
ALF_WidgetLayoutSize(HWND parent, HWND widget, UINT *pCptWidth, UINT *pCptHeight);

BOOL
ALF_SetWidgetLayoutSize(HWND parent, HWND widget, UINT cptWidth, UINT cptHeight);

HWND
ALF_WidgetAtLayoutPosition(HWND parent, UINT x, UINT y);

// combo box

HWND
ALF_AddEditableComboBox(HWND win, WORD id, UINT x, UINT y, const TCHAR *defaultText);

HWND
ALF_AddSelectionOnlyComboBox(HWND win, WORD id, UINT x, UINT y);

int /* index */
ALF_ComboBoxAddString(HWND combo, const TCHAR *text);

void
ALF_ComboBoxInsertString(HWND combo, int index, const TCHAR *text);

void
ALF_ComboBoxRemoveString(HWND combo, int index);

TCHAR * // free with HeapFree
ALF_ComboBoxStringForIndex(HWND combo, int index);

int
ALF_ComboBoxCurrentIndex(HWND combo);

void
ALF_ComboBoxSetCurrentIndex(HWND combo, int index);

TCHAR * // free with HeapFree
ALF_ComboBoxCurrentText(HWND combo);

void
ALF_ComboBoxSetText(HWND combo, const TCHAR *text);

// panel
HWND
ALF_AddPanel(HWND parent, WORD id, UINT x, UINT y);

#ifdef __cplusplus
} // extern C
#endif