From e8f8255d46081dd228b71f6c39a296368fd0880b Mon Sep 17 00:00:00 2001
From: Muhammed abdelkader <muhammed.abdelkader@schibsted.com>
Date: Thu, 21 Nov 2024 09:54:59 +0100
Subject: [PATCH] feat: add avail subnet

---
 reports/available_subnets/ip.py   | 28 ++++++++++++++++++
 reports/available_subnets/main.tf | 49 +++++++++++++++++++++++++++++++
 2 files changed, 77 insertions(+)
 create mode 100644 reports/available_subnets/ip.py
 create mode 100644 reports/available_subnets/main.tf

diff --git a/reports/available_subnets/ip.py b/reports/available_subnets/ip.py
new file mode 100644
index 0000000..5432414
--- /dev/null
+++ b/reports/available_subnets/ip.py
@@ -0,0 +1,28 @@
+import ipaddress
+
+# Define the VPC CIDR and allocated subnets
+vpc_cidr = ""
+allocated = [
+    "",
+]
+
+# Create the VPC network object
+vpc = ipaddress.IPv4Network(vpc_cidr)
+allocated_networks = [ipaddress.IPv4Network(cidr) for cidr in allocated]
+
+# Start with the entire VPC CIDR and subtract allocated networks
+remaining = [vpc]
+for network in allocated_networks:
+    new_remaining = []
+    for r in remaining:
+        # Only exclude if the allocated network is within the current range
+        if network.overlaps(r):
+            new_remaining.extend(r.address_exclude(network))
+        else:
+            new_remaining.append(r)  # Keep the current range as-is
+    remaining = new_remaining
+
+# Print the available CIDR ranges
+print("Available CIDR ranges:")
+for r in remaining:
+    print(r)
diff --git a/reports/available_subnets/main.tf b/reports/available_subnets/main.tf
new file mode 100644
index 0000000..426f842
--- /dev/null
+++ b/reports/available_subnets/main.tf
@@ -0,0 +1,49 @@
+provider "aws" {
+  region = "eu-west-1"
+}
+
+# Variable to select a VPC by name
+variable "selected_vpc_name" {
+  description = "The name of the VPC to use for further operations"
+  type        = string 
+}
+
+# Fetch the VPC by Name
+data "aws_vpc" "selected_vpc" {
+  filter {
+    name   = "tag:Name"
+    values = [var.selected_vpc_name]
+  }
+}
+
+# Fetch all subnets in the VPC
+data "aws_subnets" "vpc_subnets" {
+  filter {
+    name   = "vpc-id"
+    values = [data.aws_vpc.selected_vpc.id]
+  }
+}
+
+# Fetch details for each subnet
+data "aws_subnet" "details" {
+  for_each = toset(data.aws_subnets.vpc_subnets.ids)
+  id       = each.value
+}
+
+# Output all allocated CIDR blocks
+output "allocated_cidr_blocks" {
+  value = [
+    for subnet in data.aws_subnet.details :
+    subnet.cidr_block
+  ]
+}
+
+# Available CIDR block calculation (placeholder for custom logic)
+output "available_cidr_ranges" {
+  value = "Custom logic required: Subtract allocated CIDRs from VPC CIDR"
+}
+
+output "vpc_cidr" {
+  value = data.aws_vpc.selected_vpc.cidr_block
+  
+}
\ No newline at end of file