package main

import (
	"fmt"
	"github.com/pkg/term"
	"git.kiefte.eu/lapingvino/clitris/tris"
)

// GetKey() returns the key currently pressed. It always returns a 3 byte slice. Check first element for Escape for handling arrow keys
// Because a defer would trigger too late and the Restore and Close are essential, separated in a function.
func GetKey() []byte {
	t, _ := term.Open("/dev/tty")
	term.RawMode(t)
	key := make([]byte, 3)
	t.Read(key)
	t.Restore()
	t.Close()
	return key
}

func main() {
	var f tris.Field
	fmt.Print("\033[2J") // Clear screen
	var p, oldp tris.Point
	for {
		fmt.Print("\033[2J") // Clear screen
		f[oldp.Y][oldp.X] = false
		oldp = p
		f[p.Y][p.X] = true
		fmt.Print("\033[0;0H") // Position to 0,0
		fmt.Println(f.String())
		key := GetKey()
		switch key[0] {
		case 27: // Escape, read the arrow key pressed
			switch key[2] {
			case 65: // Up
				p.Y = (p.Y + 20 - 1)%20
			case 66: // Down
				p.Y = (p.Y + 20 + 1)%20
			case 67: // Right
				p.X = (p.X + 10 + 1)%10
			case 68: // Left
				p.X = (p.X + 10 - 1)%10
			default:
				fmt.Println("...escape, escape!")
				return
			}
		case 'q':
			fmt.Println("...that was exciting!")
			return
		default:
			if key[0] != 0 {
				fmt.Print(string(key[0]))
			}
		}
	}
}