#include "stdafx.h"
#include <commctrl.h>
#include <vector>

#pragma comment(lib, "version.lib")

// Reads the executable's FILEVERSION from its VERSIONINFO resource,
// formatted as "major.minor.build" (empty on failure).
static ATL::CString GetAppVersionString()
{
    ATL::CString result;
    WCHAR path[MAX_PATH];
    if (GetModuleFileNameW(NULL, path, MAX_PATH) == 0)
        return result;

    DWORD handle = 0;
    DWORD size = GetFileVersionInfoSizeW(path, &handle);
    if (size == 0)
        return result;

    std::vector<BYTE> buffer(size);
    if (!GetFileVersionInfoW(path, handle, size, buffer.data()))
        return result;

    VS_FIXEDFILEINFO* ffi = nullptr;
    UINT len = 0;
    if (VerQueryValueW(buffer.data(), L"\\", (LPVOID*)&ffi, &len) && ffi != nullptr) {
        result.Format(_T("%u.%u.%u"),
            HIWORD(ffi->dwFileVersionMS),
            LOWORD(ffi->dwFileVersionMS),
            HIWORD(ffi->dwFileVersionLS));
    }
    return result;
}

INT_PTR CALLBACK AboutDialogProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg) {
    case WM_INITDIALOG: {
        RECT rc; GetWindowRect(hwndDlg, &rc);
        int w = rc.right - rc.left, h = rc.bottom - rc.top;
        int x = (GetSystemMetrics(SM_CXSCREEN) - w) / 2;
        int y = (GetSystemMetrics(SM_CYSCREEN) - h) / 2;
        SetWindowPos(hwndDlg, NULL, x, y, 0, 0, SWP_NOSIZE | SWP_NOZORDER);

        ATL::CString version = GetAppVersionString();
        if (!version.IsEmpty()) {
            ATL::CString text;
            text.Format(_T("Taskbar Calculator - %s"), (LPCTSTR)version);
            SetDlgItemText(hwndDlg, IDC_VERSION, text);
        }
        return TRUE;
    }
    case WM_NOTIFY:
        switch (((LPNMHDR)lParam)->code) {
        case NM_CLICK:
        case NM_RETURN: {
            PNMLINK p = (PNMLINK)lParam;
            if (p->item.iLink == 0)
                ShellExecuteW(NULL, L"open", p->item.szUrl, NULL, NULL, SW_SHOW);
            break;
        }
        }
        break;
    case WM_COMMAND:
        switch (LOWORD(wParam)) {
        case IDOK:
        case IDCANCEL:
            EndDialog(hwndDlg, TRUE);
            return TRUE;
        }
        break;
    }
    return FALSE;
}