From 2beccdd0e61d9d509611a2adeb68a278d9020936 Mon Sep 17 00:00:00 2001
From: Bert Peters <bert@bertptrs.nl>
Date: Wed, 11 Dec 2024 18:53:06 +0100
Subject: [PATCH] day 11 part 1 in terraform

---
 2024/bonus/day11/main.tf           | 161 +++++++++++++++++++++++++++++
 2024/bonus/day11/step/main.tf      |  27 +++++
 2024/bonus/day11/transform/main.tf |  15 +++
 2024/bonus/main.tf                 |   9 ++
 2024/bonus/tests.tftest.hcl        |  18 ++++
 5 files changed, 230 insertions(+)
 create mode 100644 2024/bonus/day11/main.tf
 create mode 100644 2024/bonus/day11/step/main.tf
 create mode 100644 2024/bonus/day11/transform/main.tf

diff --git a/2024/bonus/day11/main.tf b/2024/bonus/day11/main.tf
new file mode 100644
index 0000000..6ae9dc3
--- /dev/null
+++ b/2024/bonus/day11/main.tf
@@ -0,0 +1,161 @@
+variable "input" {
+  type = string
+}
+
+locals {
+  nums = [for s in split(" ", chomp(var.input)) : tonumber(s)]
+}
+
+module "step1" {
+  source = "./step"
+
+  prev = local.nums
+}
+
+module "step2" {
+  source = "./step"
+
+  prev = module.step1.next
+}
+
+module "step3" {
+  source = "./step"
+
+  prev = module.step2.next
+}
+
+module "step4" {
+  source = "./step"
+
+  prev = module.step3.next
+}
+
+module "step5" {
+  source = "./step"
+
+  prev = module.step4.next
+}
+
+module "step6" {
+  source = "./step"
+
+  prev = module.step5.next
+}
+
+module "step7" {
+  source = "./step"
+
+  prev = module.step6.next
+}
+
+module "step8" {
+  source = "./step"
+
+  prev = module.step7.next
+}
+
+module "step9" {
+  source = "./step"
+
+  prev = module.step8.next
+}
+
+module "step10" {
+  source = "./step"
+
+  prev = module.step9.next
+}
+
+module "step11" {
+  source = "./step"
+
+  prev = module.step10.next
+}
+
+module "step12" {
+  source = "./step"
+
+  prev = module.step11.next
+}
+
+module "step13" {
+  source = "./step"
+
+  prev = module.step12.next
+}
+
+module "step14" {
+  source = "./step"
+
+  prev = module.step13.next
+}
+
+module "step15" {
+  source = "./step"
+
+  prev = module.step14.next
+}
+
+module "step16" {
+  source = "./step"
+
+  prev = module.step15.next
+}
+
+module "step17" {
+  source = "./step"
+
+  prev = module.step16.next
+}
+
+module "step18" {
+  source = "./step"
+
+  prev = module.step17.next
+}
+
+module "step19" {
+  source = "./step"
+
+  prev = module.step18.next
+}
+
+module "step20" {
+  source = "./step"
+
+  prev = module.step19.next
+}
+
+module "step21" {
+  source = "./step"
+
+  prev = module.step20.next
+}
+
+module "step22" {
+  source = "./step"
+
+  prev = module.step21.next
+}
+
+module "step23" {
+  source = "./step"
+
+  prev = module.step22.next
+}
+
+module "step24" {
+  source = "./step"
+
+  prev = module.step23.next
+}
+
+module "step25" {
+  source = "./step"
+
+  prev = module.step24.next
+}
+
+output "part1" {
+  value = length(flatten(module.step25.next))
+}
diff --git a/2024/bonus/day11/step/main.tf b/2024/bonus/day11/step/main.tf
new file mode 100644
index 0000000..24a627b
--- /dev/null
+++ b/2024/bonus/day11/step/main.tf
@@ -0,0 +1,27 @@
+variable "prev" {
+  type = list(number)
+}
+
+locals {
+  values = [
+    for num in var.prev : num == 0 ? [1]
+    : length(tostring(num)) % 2 == 0
+    ? [tonumber(substr(tostring(num), 0, length(tostring(num)) / 2)), tonumber(substr(tostring(num), length(tostring(num)) / 2, 10))]
+    : [num * 2024]
+  ]
+}
+
+# module "transform" {
+#   source = "../transform"
+
+#   count = length(var.prev)
+#   num   = var.prev[count.index]
+# }
+
+# output "next" {
+#   value = flatten(module.transform[*].result)
+# }
+
+output "next" {
+  value = flatten(local.values)
+}
diff --git a/2024/bonus/day11/transform/main.tf b/2024/bonus/day11/transform/main.tf
new file mode 100644
index 0000000..46c5c83
--- /dev/null
+++ b/2024/bonus/day11/transform/main.tf
@@ -0,0 +1,15 @@
+variable "num" {
+  type = number
+}
+
+locals {
+  as_str = tostring(var.num)
+  len    = length(local.as_str)
+  half   = floor(length(local.as_str) / 2)
+  first  = try(tonumber(substr(local.as_str, 0, local.half)), -1)
+  second = try(tonumber(substr(local.as_str, local.half, local.half)), -1)
+}
+
+output "result" {
+  value = var.num == 0 ? [1] : local.len % 2 == 0 ? [local.first, local.second] : [var.num * 2024]
+}
diff --git a/2024/bonus/main.tf b/2024/bonus/main.tf
index ba870c4..1ce7d99 100644
--- a/2024/bonus/main.tf
+++ b/2024/bonus/main.tf
@@ -65,3 +65,12 @@ module "day05" {
 output "day05_1" {
   value = module.day05.part1
 }
+
+module "day11" {
+  source = "./day11"
+  input  = file("../inputs/11.txt")
+}
+
+output "day11_1" {
+  value = module.day11.part1
+}
diff --git a/2024/bonus/tests.tftest.hcl b/2024/bonus/tests.tftest.hcl
index a4669de..6f9f16c 100644
--- a/2024/bonus/tests.tftest.hcl
+++ b/2024/bonus/tests.tftest.hcl
@@ -130,3 +130,21 @@ run "day5_1" {
     error_message = "Part1 output is wrong"
   }
 }
+
+run "day11" {
+  command = plan
+
+  module {
+    source = "./day11"
+  }
+
+  variables {
+    input = "125 17"
+  }
+
+  assert {
+    condition     = output.part1 == 55312
+    error_message = "Part1 output is wrong"
+  }
+
+}