plugins {
    kotlin("jvm") version "1.9.21"
}

sourceSets {
    main {
        kotlin.srcDir("src")
    }
}

tasks {
    wrapper {
        gradleVersion = "8.5"
    }

    // Adapted from https://github.com/kotlin-hands-on/advent-of-code-kotlin-template/pull/17
    task("generateNextDay") {
        doLast {
            val prevDayNum = fileTree("$projectDir/src").matching {
                include("Day*.kt")
            }.maxOf {
                val (prevDayNum) = Regex("Day(\\d\\d)").find(it.name)!!.destructured
                prevDayNum.toInt()
            }
            val newDayNum = String.format("%02d", prevDayNum + 1)
            File("$projectDir/src", "Day$newDayNum.kt").writeText(
                """fun main() {
    fun part1(input: List<String>): Int {
        return input.size
    }

    fun part2(input: List<String>): Int {
        return input.size  
    }

    // test if implementation meets criteria from the description, like:
    val testInput = readInput("Day${newDayNum}_test")
    check(part1(testInput) == 0)

    val input = readInput("Day${newDayNum}")
    part1(input).println()
    part2(input).println()
}
"""
            )
            File("$projectDir/src", "Day$newDayNum.txt").createNewFile()
            File("$projectDir/src", "Day${newDayNum}_test.txt").createNewFile()
        }
    }
}