package termui

import tm "github.com/nsf/termbox-go"

const TOP_RIGHT = '┐'
const VERTICAL_LINE = '│'
const HORIZONTAL_LINE = '─'
const TOP_LEFT = '┌'
const BOTTOM_RIGHT = '┘'
const BOTTOM_LEFT = '└'

type Box struct {
	X int
	Y int
	Width int
	Height int
	Border bool
	FgColor tm.Attribute
	BgColor tm.Attribute
}

type HLine struct {
	X int
	Y int
	Length int
	FgColor tm.Attribute
	BgColor tm.Attribute
}

type VLine struct {
	X int
	Y int
	Length int
	FgColor tm.Attribute
	BgColor tm.Attribute
}

func (l HLine) Buffer() []Point{
	pts := make([]Point,l.Length)
	for i:=0;i<l.Length;i++{
		pts[i].X = l.X+i
		pts[i].Y = l.Y
		pts[i].Code.Ch = HORIZONTAL_LINE
		pts[i].Code.Bg = l.BgColor
		pts[i].Code.Fg = l.FgColor
	}
	return pts
}

func (l VLine) Buffer() []Point{
	pts := make([]Point,l.Length)
	for i:=0;i<l.Length;i++{
		pts[i].X = l.X
		pts[i].Y = l.Y+i
		pts[i].Code.Ch = VERTICAL_LINE
		pts[i].Code.Bg = l.BgColor
		pts[i].Code.Fg = l.FgColor
	}
	return pts
}

func (b Box) Buffer() []Point{
	if b.Width<2 || b.Height<2 {
		return nil
	}
	pts := make([]Point,2*b.Width+2*b.Height-4)

	pts[0].X = b.X
	pts[0].Y = b.Y
	pts[0].Code.Fg = b.FgColor
	pts[0].Code.Bg = b.BgColor
	pts[0].Code.Ch = TOP_LEFT

	pts[1].X = b.X+b.Width-1
	pts[1].Y = b.Y
	pts[1].Code.Fg = b.FgColor
	pts[1].Code.Bg = b.BgColor
	pts[1].Code.Ch = TOP_RIGHT

	pts[2].X = b.X
	pts[2].Y = b.Y+b.Height-1
	pts[2].Code.Fg = b.FgColor
	pts[2].Code.Bg = b.BgColor
	pts[2].Code.Ch = BOTTOM_LEFT

	pts[3].X = b.X+b.Width-1
	pts[3].Y = b.Y+b.Height-1
	pts[3].Code.Fg = b.FgColor
	pts[3].Code.Bg = b.BgColor
	pts[3].Code.Ch = BOTTOM_RIGHT

	copy(pts[4:],(HLine{b.X+1,b.Y,b.Width-2,b.FgColor,b.BgColor}).Buffer())
	copy(pts[4+b.Width-2:],(HLine{b.X+1,b.Y+b.Height-1,b.Width-2,b.FgColor,b.BgColor}).Buffer())
	copy(pts[4+2*b.Width-4:],(VLine{b.X,b.Y+1,b.Height-2,b.FgColor,b.BgColor}).Buffer())
	copy(pts[4+2*b.Width-4+b.Height-2:],(VLine{b.X+b.Width-1,b.Y+1,b.Height-2,b.FgColor,b.BgColor}).Buffer())
	
	return pts
}