From ab5fd24260b3097a5c6906fd2afd9c7155626c3a Mon Sep 17 00:00:00 2001
From: chrisly42 <chrisly@platon42.de>
Date: Tue, 2 Dec 2025 23:01:42 +0100
Subject: [PATCH] Modified Downloader to wait until the time is right before
 attempting to download today's puzzle.

---
 src/downloader/Downloader.kt | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/src/downloader/Downloader.kt b/src/downloader/Downloader.kt
index adf46ea..527b1fb 100644
--- a/src/downloader/Downloader.kt
+++ b/src/downloader/Downloader.kt
@@ -4,15 +4,19 @@ import com.mohamedrejeb.ksoup.html.parser.KsoupHtmlHandler
 import com.mohamedrejeb.ksoup.html.parser.KsoupHtmlParser
 import fuel.Fuel
 import fuel.method
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.runBlocking
 import java.io.FileNotFoundException
 import java.nio.charset.Charset
 import java.nio.file.Files
 import java.nio.file.Paths
 import java.time.LocalDate
+import java.time.LocalTime
 import java.time.Month
 import java.time.ZoneId
 import java.util.*
+import kotlin.time.Duration.Companion.minutes
+import kotlin.time.Duration.Companion.seconds
 
 fun main() {
     var cookie = "<insert your session cookie here or store in gradle.properties>"
@@ -42,7 +46,7 @@ class Downloader(val year: Int, val packageName: String, val sessionCookie: Stri
         if (!Files.exists(targetDir)) {
             Files.createDirectories(targetDir)
         }
-        val now = LocalDate.now(ZoneId.of("UTC-1"))
+        val now = LocalDate.now(ZoneId.of("UTC+1"))
         val maxPuzzles = if (year < 2025) 25 else 12
         val lastDay = if (now.isBefore(LocalDate.of(year, Month.DECEMBER, maxPuzzles))) {
             if (now.isAfter(LocalDate.of(year, Month.NOVEMBER, 30))) {
@@ -60,6 +64,20 @@ class Downloader(val year: Int, val packageName: String, val sessionCookie: Stri
             val descriptionFile = targetDir.resolve(DESC_FILENAME.format(day))
             val genClassFile = targetDir.resolve(GENCLASS_FILENAME.format(day))
             if (!Files.exists(inputFile)) {
+                if (day == lastDay && LocalTime.now(ZoneId.of("UTC+1")).hour < 5) {
+                    println("Puzzle will not be available within the next hour. Skipping.")
+                    break
+                }
+                while (day == lastDay && LocalTime.now(ZoneId.of("UTC+1")).hour == 5) {
+                    println("Waiting until puzzle is available...")
+                    runBlocking {
+                        if (LocalTime.now(ZoneId.of("UTC+1")).minute < 59) {
+                            delay(1.minutes)
+                        } else {
+                            delay(1.seconds)
+                        }
+                    }
+                }
                 println("Attempting to download input for day $day")
                 val (code, data) = downloadInput(day)
                 if (code != 200) {
@@ -157,7 +175,7 @@ class Downloader(val year: Int, val packageName: String, val sessionCookie: Stri
                 url = "https://adventofcode.com/$year/day/$day$suffix",
                 method = "GET",
                 headers = mapOf(
-                    "User-Agent" to "git.platon42.de/chrisly42/advent-of-code",
+                    "User-Agent" to "git.platon42.de/chrisly42/advent-of-code (chrisly@platon42.de)",
                     "Cookie" to "session=$sessionCookie"
                 )
             )