package de.thermondo.solutions.advent2022.day01

import de.thermondo.utils.Exclude
import de.thermondo.utils.stringFromFile

/**
 * The jungle must be too overgrown and difficult to navigate in vehicles or access from the air; the Elves' expedition
 * traditionally goes on foot. As your boats approach land, the Elves begin taking inventory of their supplies.
 * One important consideration is food - in particular, the number of Calories each Elf is carrying (your puzzle input).
 *
 * The Elves take turns writing down the number of Calories contained by the various meals, snacks, rations, etc. that
 * they've brought with them, one item per line. Each Elf separates their own inventory from the previous Elf's
 * inventory (if any) by a blank line.
 *
 * For example, suppose the Elves finish writing their items' Calories and end up with the following list:
 *
 * 1000
 * 2000
 * 3000
 *
 * 4000
 * 5000
 * 6000
 *
 * 7000
 * 8000
 * 9000
 *
 * 10000
 *
 * This list represents the Calories of the food carried by five Elves:
 *  - The first Elf is carrying food with 1000, 2000, and 3000 Calories, a total of 6000 Calories.
 *  - The second Elf is carrying one food item with 4000 Calories.
 *  - The third Elf is carrying food with 5000 and 6000 Calories, a total of 11000 Calories.
 *  - The fourth Elf is carrying food with 7000, 8000, and 9000 Calories, a total of 24000 Calories.
 *  - The fifth Elf is carrying one food item with 10000 Calories.
 *
 *  In case the Elves get hungry and need extra snacks, they need to know which Elf to ask: they'd like to know how many
 *  Calories are being carried by the Elf carrying the most Calories. In the example above, this is 24000
 *  (carried by the fourth Elf).
 *
 *  Find the Elf carrying the most Calories. How many total Calories is that Elf carrying?
 */

@Exclude
fun main() {
    val input = stringFromFile("/advent2022/InputDay01.txt")
    val calories = input?.let(::calculateCaloriesPartOne)
    println("The Elf is carrying $calories calories.")
}

fun calculateCaloriesPartOne(input: String): Int {
    val elves = input.split("\n\n")
    val calories = mutableListOf<Int>()

    for (elf in elves) {
        calories.add(elf.split("\n").sumOf { it.toInt() })
    }

    calories.sortDescending()

    return calories.take(1).sum()
}
