// Copyright 2014 The gocui Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build windows

package gocui

import (
	"os"
	"syscall"
	"unsafe"
)

type wchar uint16
type short int16
type dword uint32
type word uint16

type coord struct {
	x short
	y short
}

type smallRect struct {
	left   short
	top    short
	right  short
	bottom short
}

type consoleScreenBufferInfo struct {
	size              coord
	cursorPosition    coord
	attributes        word
	window            smallRect
	maximumWindowSize coord
}

var (
	kernel32                       = syscall.NewLazyDLL("kernel32.dll")
	procGetConsoleScreenBufferInfo = kernel32.NewProc("GetConsoleScreenBufferInfo")
)

// getTermWindowSize is get terminal window size on windows.
func (g *Gui) getTermWindowSize() (int, int, error) {
	var csbi consoleScreenBufferInfo
	r1, _, err := procGetConsoleScreenBufferInfo.Call(os.Stdout.Fd(), uintptr(unsafe.Pointer(&csbi)))
	if r1 == 0 {
		return 0, 0, err
	}
	return int(csbi.window.right - csbi.window.left + 1), int(csbi.window.bottom - csbi.window.top + 1), nil
}