use std::mem::zeroed;
use winapi::shared::windef::HBITMAP;
use winapi::shared::windef::HDC;
use winapi::shared::windef::HGDIOBJ;
use winapi::um::wingdi::BitBlt;
use winapi::um::wingdi::CreateCompatibleBitmap;
use winapi::um::wingdi::CreateCompatibleDC;
use winapi::um::wingdi::DeleteDC;
use winapi::um::wingdi::DeleteObject;
use winapi::um::wingdi::GetDIBits;
use winapi::um::wingdi::SelectObject;
use winapi::um::wingdi::BITMAPINFO;
use winapi::um::wingdi::DIB_RGB_COLORS;
use winapi::um::wingdi::SRCCOPY;
use winapi::um::winuser::GetDC;
use winapi::um::winuser::GetDesktopWindow;

fn main() {
    const width: i32 = 1000;
    const height: i32 = 500;
    unsafe {
        let desktopHandle = GetDesktopWindow();
        let mut windowDC = GetDC(desktopHandle);
        let outputBitmap = CreateCompatibleBitmap(windowDC, width, height);
        let blitDC = CreateCompatibleDC(windowDC);
        let oldBitmap = SelectObject(blitDC, outputBitmap as HGDIOBJ);
        BitBlt(blitDC, 0, 0, width, height, windowDC, 0, 0, SRCCOPY);
        SelectObject(blitDC, oldBitmap);
        let mut bi = zeroed::<BITMAPINFO>();
        bi.bmiHeader.biSize = 40;
        let ok = GetDIBits(
            blitDC,
            outputBitmap,
            0,
            height as u32,
            std::ptr::null_mut(),
            &mut bi,
            DIB_RGB_COLORS,
        );
        if ok != 0 {
            let mut bih = bi.bmiHeader;
            bih.biHeight = -(bih.biHeight).abs();
            bi.bmiHeader.biCompression = 0;
            createImage(blitDC, outputBitmap, bi);
            // return image
        }

        DeleteObject(outputBitmap as HGDIOBJ);
        DeleteDC(blitDC);
    }
}

fn createImage(hdc: HDC, outputBitmap: HBITMAP, bi: BITMAPINFO) {
    let bih = bi.bmiHeader;
    let height = bih.biHeight.abs();
    let bitCount = bih.biBitCount as i32;
    let strideBits = bih.biWidth * bitCount;
    let strideBytesAligned = (((strideBits - 1) | 0x1F) + 1) >> 3;
}