package main

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

// Screen is a basic structure for all of the applications screens
type Screen interface {
	handleKeyEvent(event termbox.Event) int
	performLayout(style Style)
	drawScreen(style Style)
}

func drawBackground(bg termbox.Attribute) {
	termbox.Clear(0, bg)
}

func layoutAndDrawScreen(screen Screen, style Style) {
	screen.performLayout(style)
	drawBackground(style.defaultBg)
	screen.drawScreen(style)
	termbox.Flush()
}

// Style defines style for a screen
type Style struct {
	defaultBg termbox.Attribute
	defaultFg termbox.Attribute
	titleFg   termbox.Attribute
	titleBg   termbox.Attribute
	cursorFg  termbox.Attribute
	cursorBg  termbox.Attribute
}

func getDefaultStyle() Style {
	return Style{
		defaultBg: termbox.ColorBlack,
		defaultFg: termbox.ColorWhite,
		titleBg:   termbox.ColorBlack,
		titleFg:   termbox.ColorGreen,
		cursorBg:  termbox.ColorWhite,
		cursorFg:  termbox.ColorBlack,
	}
}