package main

import (
	"fmt"
	"github.com/nsf/termbox-go"
	"gogs.bullercodeworks.com/brian/termbox-util"
)

type Command struct {
	key         string
	description string
}

type AboutScreen int

func drawCommandsAtPoint(commands []Command, x int, y int, style Style) {
	x_pos, y_pos := x, y
	for index, cmd := range commands {
		termbox_util.DrawStringAtPoint(fmt.Sprintf("%6s", cmd.key), x_pos, y_pos, style.default_fg, style.default_bg)
		termbox_util.DrawStringAtPoint(cmd.description, x_pos+8, y_pos, style.default_fg, style.default_bg)
		y_pos++
		if index > 2 && index%2 == 1 {
			y_pos++
		}
	}
}

func (screen *AboutScreen) handleKeyEvent(event termbox.Event) int {
	return MAIN_SCREEN_INDEX
}

func (screen *AboutScreen) performLayout() {}

func (screen *AboutScreen) drawScreen(style Style) {
	default_fg := style.default_fg
	default_bg := style.default_bg
	width, height := termbox.Size()
	template := [...]string{
		"  ______________________  ____     ",
		" /_  __/  _/ ___<  / __ \\/ __ \\___ ",
		"  / /  / / \\__ \\/ / / / / / / / _ \\",
		" / / _/ / ___/ / / /_/ / /_/ /  __/",
		"/_/ /___//____/_/\\____/\\____/\\___/ ",
		"                                   ",
	}
	first_line := template[0]
	start_x := (width - len(first_line)) / 2
	start_y := ((height - 2*len(template)) / 2) - 2
	x_pos, y_pos := start_x, start_y
	if height < 15 {
		start_y = 0
		y_pos = 0
	}
	for _, line := range template {
		x_pos = start_x
		for _, runeValue := range line {
			bg := default_bg
			displayRune := ' '
			if runeValue != ' ' {
				displayRune = runeValue
				termbox.SetCell(x_pos, y_pos, displayRune, default_fg, bg)
			}
			x_pos++
		}
		y_pos++
	}
	commands1 := [...]Command{
		{"Ctrl+←", "Move to Node Left"},
		{"Ctrl+↓", "Move to Node Down"},
		{"Ctrl+↑", "Move to Node Up"},
		{"Ctrl+→", "Move to Node Right"},
	}

	x_pos = start_x
	y_pos++

	drawCommandsAtPoint(commands1[:], x_pos, y_pos+1, style)

	exit_txt := "Press any key to return to emulator"
	termbox_util.DrawStringAtPoint(exit_txt, (width-len(exit_txt))/2, height-1, style.title_fg, style.title_bg)
}