package day25

import (
	"bufio"
	"fmt"
	"os"
)

func valueOf(r rune) int {
	switch r {
	case '2':
		return 2
	case '1':
		return 1
	case '0':
		return 0
	case '-':
		return -1
	case '=':
		return -2
	default:
		fmt.Println("PANIC PANIC")
		return 23489
	}
}

func Run(filename string) {
	file, err := os.Open(filename)
	if err != nil {
		fmt.Println("Error opening file:", err)
		return
	}

	scanner := bufio.NewScanner(file)
	scanner.Split(bufio.ScanLines)
	runningTotal := 0

	for scanner.Scan() {
		line := []rune(scanner.Text())

		current := 0
		place := 1
		for x := len(line) - 1; x >= 0; x-- {
			r := line[x]
			current += (place * valueOf(r))
			place *= 5
		}

		fmt.Println("Coverted", line, "==>", current)
		runningTotal += current
	}
	file.Close()

	fmt.Println("Running total", runningTotal)
	output := ""

	for runningTotal != 0 {
		runningTotal += 2
		digit := runningTotal % 5
		runningTotal /= 5

		switch digit {
		case 4:
			output = "2" + output
		case 3:
			output = "1" + output
		case 2:
			output = "0" + output
		case 1:
			output = "-" + output
		case 0:
			output = "=" + output
		}
	}
	fmt.Println("Which is", output, "in SNAFU.")
}