mkdir -p ~/terraform/azure/compute/azure_vm && \
cd ~/terraform/azure/compute/azure_vm

# main.tf

terraform {
  required_providers {
    azurerm = {
      source  = "hashicorp/azurerm"
      version = "~> 4.0"
    }
  }

  required_version = ">= 1.6.0"
}

provider "azurerm" {
  features {}
}

# -------------------------------
# Resource Group
# -------------------------------
resource "azurerm_resource_group" "example" {
  name     = "IntroAzureRG"
  location = "East US" # change to your region
}

# -------------------------------
# Virtual Network and Subnet
# -------------------------------
resource "azurerm_virtual_network" "example" {
  name                = "example-vnet"
  address_space       = ["10.0.0.0/16"]
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
}

resource "azurerm_subnet" "example" {
  name                 = "example-subnet"
  resource_group_name  = azurerm_resource_group.example.name
  virtual_network_name = azurerm_virtual_network.example.name
  address_prefixes     = ["10.0.1.0/24"]
}

# -------------------------------
# Public IP
# -------------------------------
resource "azurerm_public_ip" "example" {
  name                = "my-vm-ip"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_resource_group.example.location
  allocation_method   = "Static"
  sku                 = "Standard"
}

# -------------------------------
# Network Interface
# -------------------------------
resource "azurerm_network_interface" "example" {
  name                = "my-vm-nic"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name

  ip_configuration {
    name                          = "internal"
    subnet_id                     = azurerm_subnet.example.id
    private_ip_address_allocation = "Dynamic"
    public_ip_address_id          = azurerm_public_ip.example.id
  }
}

# -------------------------------
# Virtual Machine
# -------------------------------
resource "azurerm_linux_virtual_machine" "example" {
  name                = "my-vm"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_resource_group.example.location
  size                = "Standard_D2s_v5"
  admin_username      = "azureuser"
  network_interface_ids = [
    azurerm_network_interface.example.id
  ]

  admin_ssh_key {
    username   = "azureuser"
    public_key = file("~/.ssh/id_rsa.pub")
  }

  source_image_reference {
    publisher = "Canonical"
    offer     = "0001-com-ubuntu-server-jammy"
    sku       = "22_04-lts"
    version   = "latest"
  }

  os_disk {
    caching              = "ReadWrite"
    storage_account_type = "Standard_LRS"
  }

  computer_name = "my-vm"
}

# -------------------------------
# Custom Script Extension (NGINX install)
# -------------------------------
resource "azurerm_virtual_machine_extension" "nginx_setup" {
  name                 = "customScript"
  virtual_machine_id   = azurerm_linux_virtual_machine.example.id
  publisher            = "Microsoft.Azure.Extensions"
  type                 = "CustomScript"
  type_handler_version = "2.1"

  settings = jsonencode({
    fileUris = [
      "https://raw.githubusercontent.com/MicrosoftDocs/mslearn-welcome-to-azure/master/configure-nginx.sh"
    ]
  })

  protected_settings = jsonencode({
    commandToExecute = "./configure-nginx.sh"
  })
}