package main

import (
	"fmt"
	"log"
	"os"
	"strings"
)

func showUsage() {
	print(len(os.Args))
	fmt.Printf("Usage: %s <day> <part> [input.txt]\n", os.Args[0])
}

func main() {
	if (len(os.Args) < 3) {
		showUsage()
		return
	}

	day := os.Args[1]
	part := os.Args[2]

	var input_filename string
	if len(os.Args) <= 3 {
		input_filename = "input.txt"
	} else {
		input_filename = os.Args[3]
	}

	contents, err := os.ReadFile(input_filename)
	if err != nil {
		log.Fatal(err)
	}

	lines := strings.Split(strings.TrimRight(string(contents), "\n"), "\n")

	if day == "1" {
		if part == "1" {
			Day1Part1(lines)
		} else if part == "2" {
			Day1Part2(lines)
		}
	} else if day == "2" {
		if part == "1" {
			Day2Part1(lines)
		} else if part == "2" {
			Day2Part2(lines)
		}
	}
}