AOC2022/day23/day23.go

package main

import (
	"AOC2022/helper"
	"fmt"
)

func main() {
	//args := os.Args[1:]
	lines := helper.ReadTextFile("day23/input")
	elves := make(map[[2]int][3]int)
	for i := 0; i < len(lines); i++ {
		line := lines[i]
		for j := 0; j < len(line); j++ {
			if lines[i][j] == '#' {
				elves[[2]int{i, j}] = [3]int{0, 0, 0}
			}
		}
	}

	noElvesMoves := false
	i := 0
	for !noElvesMoves {
		//Get planned move for all elves
		for key, _ := range elves {
			elves[key] = getPlannedMove(key, elves, i)
		}
		//Move elves
		noElvesMoves = moveElves(&elves)
		i++
		if i == 10 {
			print(elves)
		}
	}
	fmt.Println(i)

}

func moveElves(elves *map[[2]int][3]int) bool {
	elvesWithPossiblePlanedMoves := [][2]int{}
	plannedMoves := make(map[[2]int][][2]int)
	for key, val := range *elves {
		if val != [3]int{0, 0, 0} {
			plannedMove := [2]int{key[0] + val[0], key[1] + val[1]}
			plannedMoves[plannedMove] = append(plannedMoves[plannedMove], key)
		}
	}
	for _, val := range plannedMoves {
		if len(val) == 1 {
			elvesWithPossiblePlanedMoves = append(elvesWithPossiblePlanedMoves, val[0])
		}
	}
	if len(elvesWithPossiblePlanedMoves) == 0 {
		return true
	}
	for _, elv := range elvesWithPossiblePlanedMoves {
		moveElv(elv, elves)
	}
	return false
}

func moveElv(elv [2]int, elves *map[[2]int][3]int) {
	plannedMove := (*elves)[elv]
	newElv := [2]int{elv[0] + plannedMove[0], elv[1] + plannedMove[1]}
	delete(*elves, elv)
	(*elves)[newElv] = [3]int{0, 0, plannedMove[2] + 1}
}

func getPlannedMove(point [2]int, elves map[[2]int][3]int, pastMoves int) [3]int {
	plannedMove := [3]int{0, 0, 0}
	neighbors := getNeighbors(point)
	neigborexist := false
	checkedNorth := 0
	checkedWest := 0
	checkedSouth := 0
	checkedEast := 0
	for i, neighbor := range neighbors {
		_, exist := elves[neighbor]
		if exist {
			neigborexist = true
		} else {
			if i >= 0 && i <= 2 {
				checkedNorth++
			}
			if i >= 2 && i <= 4 {
				checkedEast++
			}
			if i >= 4 && i <= 6 {
				checkedSouth++
			}
			if i >= 6 || i == 0 {
				checkedWest++
			}
		}
	}

	if neigborexist {
		priorityList := []int{checkedNorth, checkedSouth, checkedWest, checkedEast}
		directions := [][2]int{{-1, 0}, {1, 0}, {0, -1}, {0, 1}}
		for i := 0; i < pastMoves; i++ {
			priorityList = append(priorityList[1:], priorityList[0])
			directions = append(directions[1:], directions[0])
		}
		for i, priority := range priorityList {
			if priority == 3 {
				direction := directions[i]
				plannedMove = [3]int{direction[0], direction[1], 0}
				break
			}
		}
	}

	return plannedMove
}

func getNeighbors(point [2]int) (neighbors [8][2]int) {
	directions := [8][2]int{{-1, -1}, {-1, 0}, {-1, 1}, {0, 1}, {1, 1}, {1, 0}, {1, -1}, {0, -1}}
	for i, direction := range directions {
		neighbors[i] = [2]int{point[0] + direction[0], point[1] + direction[1]}
	}
	return
}

func print(elves map[[2]int][3]int) {
	highestY := 0
	highestX := 0
	lowestY := 0
	lowestX := 0
	for key, _ := range elves {
		if key[0] > highestY {
			highestY = key[0]
		}
		if key[0] < lowestY {
			lowestY = key[0]
		}
		if key[1] > highestX {
			highestX = key[1]
		}
		if key[1] < lowestX {
			lowestX = key[1]
		}
	}

	for i := lowestY - 1; i < highestY+2; i++ {
		fieldLine := []rune{}
		for j := lowestX - 1; j < highestX+2; j++ {
			val := '.'
			_, ok := elves[[2]int{i, j}]
			if ok {
				val = '#'
			}

			fieldLine = append(fieldLine, val)
		}
		fmt.Println(string(fieldLine))
	}
	fmt.Println((highestY-lowestY+1)*(highestX-lowestX+1) - len(elves))
	fmt.Println()

}