#include "alfpriv.h"

/* BUTTON */
static LRESULT CALLBACK
ALF__ButtonSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR uIdSubclass, DWORD_PTR dwRefData)
{
    (void)uIdSubclass;
    (void)dwRefData;

    ALFAPP app = (ALFAPP)dwRefData;

    if (uMsg == ALF_WM_QUERYSIZE) {
        HDC hdc = GetDC(hwnd);
        HFONT font = (HFONT)SendMessage(hwnd, WM_GETFONT, 0, 0);
        HFONT oldFont = 0;
        if (font)
            oldFont = SelectFont(hdc, font);

        // calc drawtext style
        DWORD style = GetWindowLong(hwnd, GWL_STYLE);
        UINT format = DT_LEFT | DT_EXPANDTABS | DT_CALCRECT;
        if ((style & BS_MULTILINE) == 0)
            format |= DT_SINGLELINE;

        RECT r = { 0, 0, 100, 100 };

        int textlen = GetWindowTextLength(hwnd);
        TCHAR *textbuf = (TCHAR*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY|HEAP_GENERATE_EXCEPTIONS, (textlen + 1)*sizeof(TCHAR));
        GetWindowText(hwnd, textbuf, textlen+1);

        DrawText(hdc, textbuf, -1, &r, format);

        HeapFree(GetProcessHeap(), 0, textbuf);

        int xpadding = app->compatFn->GetSystemMetricsForDpi(SM_CXEDGE,
            ALF_CentipointsToPixels(GetParent(hwnd), 7200)) * 3;
        int ypadding = app->compatFn->GetSystemMetricsForDpi(SM_CYEDGE,
            ALF_CentipointsToPixels(GetParent(hwnd), 7200)) * 3;

        SIZE *pSize = (SIZE*)(void*)lParam;
        if (pSize->cx < r.right - r.left + xpadding) {
            pSize->cx = r.right - r.left + xpadding;
        }
        if (pSize->cy < r.bottom - r.top + ypadding) {
            pSize->cy = r.bottom - r.top + ypadding;
        }
        if (pSize->cx < pSize->cy) {
            pSize->cx = pSize->cy;
        }

        if (font)
            SelectFont(hdc, oldFont);

        ReleaseDC(hwnd, hdc);
    } else if (uMsg == WM_NCCALCSIZE) {
        /* HACK: a themed button contains a 1px margin. An unthemed button
         * does not, so we add one by shrinking the client area */
        RECT *r = (RECT *)lParam;

        int retval = app->compatFn->DefSubclassProc(hwnd, uMsg, wParam, lParam);

        if (!app->compatFn->IsAppThemed()) {
            r->top    += 1;
            r->bottom -= 1;
        }

        return retval;
    } else if (uMsg == WM_THEMECHANGED) {
        SetWindowPos(hwnd, NULL, 0, 0, 0, 0, SWP_NOMOVE|SWP_NOSIZE|SWP_NOZORDER|SWP_FRAMECHANGED);
    }

    return app->compatFn->DefSubclassProc(hwnd, uMsg, wParam, lParam);
}

HWND
ALF_AddButton(HWND win, WORD id, UINT x, UINT y, const WCHAR *text)
{
    HWND hwndButton  = CreateWindowEx(0,
                                      L"BUTTON",
                                      text,
                                      WS_CHILD | WS_TABSTOP | WS_VISIBLE | BS_PUSHBUTTON | BS_MULTILINE,
                                      0, 0, 100, 100,
                                      win,
                                      (HMENU)(int)id,
                                      (HINSTANCE)GetWindowLongPtr(win, GWLP_HINSTANCE),
                                      NULL);

    ALFAPP app = ALF_ApplicationFromWindow(win);

    app->compatFn->SetWindowSubclass(hwndButton, ALF__ButtonSubclassProc, 0, (DWORD_PTR)app);
    SetWindowPos(hwndButton, NULL, 0, 0, 0, 0, SWP_NOMOVE|SWP_NOSIZE|SWP_NOZORDER|SWP_FRAMECHANGED);

    ALFAddWidgetParams p;
    ZeroMemory(&p, sizeof(p));
    p.hwnd = hwndButton;
    p.x = x;
    p.y = y;
    p.width = 5625;
    p.height = 0;
    p.flags = ALF_QUERYSIZE | ALF_MESSAGEFONT;

    ALF_AddWidgetEx(win, &p);

    return hwndButton;
}


void
ALF_SetDefaultButton(HWND win, WORD id)
{
    SendMessage(win, DM_SETDEFID, (WPARAM)id, 0);
}