Implement day 2 in Terraform

2024/bonus/day01/sample.tftest.hcl

@@ -12,7 +12,7 @@ run "run" {
   }
 
   assert {
-    condition = output.part2 == 31
+    condition     = output.part2 == 31
     error_message = "Part2 output is wrong"
   }
 

2024/bonus/day02/is_savable/main.tf

@@ -0,0 +1,17 @@
+variable "report" {
+  type = list(number)
+}
+
+module "is_valid" {
+  source = "../is_valid"
+  count  = length(var.report)
+
+  report = concat(
+    count.index > 0 ? slice(var.report, 0, count.index) : [],
+    count.index < length(var.report) - 1 ? slice(var.report, count.index + 1, length(var.report)) : []
+  )
+}
+
+output "valid" {
+  value = anytrue(module.is_valid[*].valid)
+}

2024/bonus/day02/is_valid/main.tf

@@ -0,0 +1,14 @@
+variable "report" {
+  type = list(number)
+}
+
+locals {
+  delta = [for i in range(1, length(var.report)) : var.report[i] - var.report[i - 1]]
+
+  all_negative = alltrue([for d in local.delta : d <= -1 && d >= -3])
+  all_positive = alltrue([for d in local.delta : d >= 1 && d <= 3])
+}
+
+output "valid" {
+  value = local.all_negative || local.all_positive
+}

2024/bonus/day02/main.tf

@@ -0,0 +1,28 @@
+variable "input" {
+  type = string
+}
+
+locals {
+  reports = [for line in split("\n", trim(var.input, "\n")) : [for num in split(" ", line) : parseint(num, 10)]]
+}
+
+module "part1_valid" {
+  source = "./is_valid"
+
+  count  = length(local.reports)
+  report = local.reports[count.index]
+}
+
+module "part2_valid" {
+  source = "./is_savable"
+  count  = length(local.reports)
+  report = local.reports[count.index]
+}
+
+output "part1" {
+  value = length([for i in range(length(local.reports)) : true if module.part1_valid[i].valid])
+}
+
+output "part2" {
+  value = length([for i in range(length(local.reports)) : true if module.part2_valid[i].valid])
+}

2024/bonus/day02/sample.tftest.hcl

@@ -0,0 +1,19 @@
+variables {
+  input = file("../../tests/samples/02.txt")
+}
+
+run "run" {
+
+  command = plan
+
+  assert {
+    condition     = output.part1 == 2
+    error_message = "Part1 output is wrong"
+  }
+
+  assert {
+    condition     = output.part2 == 4
+    error_message = "Part2 output is wrong"
+  }
+
+}

2024/bonus/main.tf

@@ -4,7 +4,7 @@ terraform {
 
 module "day01" {
   source = "./day01"
-  input = file("../inputs/01.txt")
+  input  = file("../inputs/01.txt")
 }
 
 output "day01_1" {
@@ -14,3 +14,16 @@ output "day01_1" {
 output "day01_2" {
   value = module.day01.part2
 }
+
+module "day02" {
+  source = "./day02"
+  input  = file("../inputs/02.txt")
+}
+
+output "day02_1" {
+  value = module.day02.part1
+}
+
+output "day02_2" {
+  value = module.day02.part2
+}