Interactive tool for manually solving the puzzle

aoc-2021-23.go

package main

import (
	"fmt"
	"os"

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

func main() {
	if err := termbox.Init(); err != nil {
		panic(err)
	}
	defer termbox.Close()

	cx, cy := 0, 0
	moving := false
	scoreY := 0
	score := 0

	printScore := func() {
		str := fmt.Sprintf("score: %d", score)
		for x, ch := range str {
			termbox.SetChar(x, scoreY, ch)
		}
	}

	for {
		e := termbox.PollEvent()
		switch e.Type {
		case termbox.EventKey:
			switch e.Ch {
			case 'q':
				os.Exit(0)
			case '1', '2', '3', '4':
				idx := e.Ch - '1'
				termbox.Clear(0, 0)
				for y, row := range initStates[idx] {
					for x, ch := range row {
						termbox.SetChar(x, y, ch)
					}
					scoreY = y + 2
				}
				score = 0
				printScore()
				termbox.SetCursor(cx, cy)
				termbox.Flush()
			case 0: // handle non character keys
				updated := false
				cx0, cy0 := cx, cy
				switch e.Key {
				case termbox.KeyArrowUp:
					cy--
					updated = true
				case termbox.KeyArrowDown:
					cy++
					updated = true
				case termbox.KeyArrowLeft:
					cx--
					updated = true
				case termbox.KeyArrowRight:
					cx++
					updated = true
				case termbox.KeyEnter:
					moving = !moving
					updated = true
				}
				if updated {
					if moving && (cx0 != cx || cy0 != cy) {
						c := termbox.GetCell(cx0, cy0)
						termbox.SetChar(cx0, cy0, '.')
						termbox.SetChar(cx, cy, c.Ch)
						switch c.Ch {
						case 'A':
							score += 1
						case 'B':
							score += 10
						case 'C':
							score += 100
						case 'D':
							score += 1000
						}
						printScore()
					}
					termbox.SetCursor(cx, cy)
					termbox.Flush()
				}
			}
		}
	}
}

var (
	initStates = [][]string{
		[]string{
			"#############",
			"#...........#",
			"###B#A#A#D###",
			"  #D#C#B#C#",
			"  #########",
		},
		[]string{
			"#############",
			"#...........#",
			"###A#B#C#D###",
			"  #A#B#C#D#",
			"  #########",
		},
		[]string{
			"#############",
			"#...........#",
			"###B#A#A#D###",
			"  #D#C#B#A#",
			"  #D#B#A#C#",
			"  #D#C#B#C#",
			"  #########",
		},
		[]string{
			"#############",
			"#...........#",
			"###A#B#C#D###",
			"  #A#B#C#D#",
			"  #A#B#C#D#",
			"  #A#B#C#D#",
			"  #########",
		},
	}
)