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variable "instance_type" {
  type        = string
  default     = "t3.micro"
  description = "EC2 instance type"
  sensitive   = false
  validation {
    condition     = contains(["t3.micro","t3.small"], var.instance_type)
    error_message = "Invalid instance type."
  }
}

output "bucket_arn" {
  value     = aws_s3_bucket.demo.arn
  sensitive = false
}

locals {
  name_prefix = "${var.project}-${var.env}"
  common_tags = { Env = var.env, Owner = "ops" }
}

# count — simple repetition
resource "aws_iam_user" "devs" {
  count = 3
  name  = "dev-${count.index}"
}

# for_each — named resources
resource "aws_iam_user" "team" {
  for_each = toset(["alice","bob"])
  name     = each.key
}

# lifecycle
lifecycle {
  create_before_destroy = true
  prevent_destroy       = true
  ignore_changes        = [tags]
}

# Local module
module "vpc" {
  source      = "./modules/vpc"
  vpc_cidr    = "10.0.0.0/16"
  environment = var.environment
}

# Registry module
module "vpc" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "~> 5.0"
  cidr    = "10.0.0.0/16"
}

# Access output
resource ... { vpc_id = module.vpc.vpc_id }

# S3 backend with DynamoDB locking
terraform {
  required_version = ">= 1.5"
  required_providers {
    aws = { source = "hashicorp/aws", version = "~> 5.0" }
  }
  backend "s3" {
    bucket         = "my-tf-state"
    key            = "prod/terraform.tfstate"
    region         = "us-east-1"
    dynamodb_table = "tf-lock"
    encrypt        = true
  }
}