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#[cfg(windows)]
use winapi;
#[cfg(windows)]
use advapi32;
#[cfg(windows)]
use kernel32;
use Handle;

/// The dimensions of a terminal window.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct WinSize {
    pub cols: u16,
    pub rows: u16,
}

impl Default for WinSize {
    fn default() -> WinSize {
        WinSize { cols: 80, rows: 24 }
    }
}

/// The size of the console connected to the `handle`.
///
/// Does not work in a Cygwin/MSYS2 window.
#[cfg(windows)]
pub fn get_size(handle: Handle) -> Option<WinSize> {
    get_screen_buffer_size(handle.win_handle())
}

#[cfg(windows)]
pub fn get_screen_buffer_size(hndl: winapi::HANDLE) -> Option<WinSize> {
    let mut csbi: winapi::CONSOLE_SCREEN_BUFFER_INFO =
        unsafe { ::std::mem::uninitialized() };
    let res = unsafe { kernel32::GetConsoleScreenBufferInfo(hndl, &mut csbi) };
    if res == 0 {
        return None;
    }
    Some(WinSize {
        cols: (csbi.srWindow.Right - csbi.srWindow.Left + 1) as u16,
        rows: (csbi.srWindow.Bottom - csbi.srWindow.Top + 1) as u16,
    })
}

#[cfg(windows)]
use std::io;
#[cfg(windows)]
pub fn get_cygwin_size(w: &io::Write, defsz: WinSize) -> WinSize {
    // TODO: use cursor report?
    let _ = w;
    let _ = defsz;
    Default::default()
}

/// The size of the terminal connected to the `handle`.
#[cfg(not(windows))]
pub fn get_size(handle: Handle) -> Option<WinSize> {
    let win: ::libc::winsize = unsafe { ::std::mem::uninitialized() };
    let res = unsafe { ::libc::ioctl(handle.fd(), ::libc::TIOCGWINSZ, &win) };
    if res != 0 {
        return None;
    }
    Some(WinSize {
        cols: u16::from(win.ws_col),
        rows: u16::from(win.ws_row),
    })
}

#[cfg(windows)]
pub fn get_default_console_size() -> WinSize {
    use std::ptr;

    let mut key: winapi::HKEY = ptr::null_mut();
    let res = unsafe {
        advapi32::RegOpenKeyExA(
            winapi::HKEY_CURRENT_USER,
            "Console\x00".as_ptr() as *const _ as winapi::LPCSTR,
            0,
            winapi::KEY_READ,
            &mut key,
        )
    };
    if res != 0 {
        return Default::default();
    }
    let mut data = 0u32;
    let mut data_size = 4u32;
    let res = unsafe {
        advapi32::RegQueryValueExA(
            key,
            "WindowSize\x00".as_ptr() as *const _ as winapi::LPCSTR,
            ptr::null_mut(),
            ptr::null_mut(),
            &mut data as *mut _ as *mut u8,
            &mut data_size,
        )
    };
    if res != 0 {
        return Default::default();
    }
    WinSize {
        cols: (data & 0xffff) as u16,
        rows: (data >> 16) as u16,
    }
}