resource "aws_instance" "ec2-instance" {
  ami                         = var.ami-id
  instance_type               = var.instance-type
  associate_public_ip_address = var.asso-public-ip
  // availability_zone = var.az
  iam_instance_profile = var.instance-profile
  key_name             = var.key-name
  private_ip           = var.private-ip
  root_block_device {
    encrypted             = var.ebs-encrypted
    volume_size           = var.root-volume-size
    volume_type           = var.root-volume-type
    kms_key_id            = var.kms-key-id
    delete_on_termination = var.delete-on-termination
  }
  ebs_optimized          = true
  subnet_id              = var.subnet-id
  vpc_security_group_ids = var.security-groups
  tags = merge(var.additional_tags, var.default-tags,
    { Name = var.instance-name }
  )
  volume_tags = merge(var.additional_tags, var.default-tags,
    { Name = var.instance-name }
  )
  # IMDSv2 requirement
  metadata_options {
    http_endpoint               = "enabled"
    http_tokens                 = "required"
    http_put_response_hop_limit = 2
  }
}

resource "aws_ebs_volume" "data-volumes" {
  for_each          = var.data-volumes
  availability_zone = aws_instance.ec2-instance.availability_zone
  size              = each.value["size"]
  type              = each.value["type"]
  kms_key_id = aws_instance.ec2-instance.root_block_device[0].kms_key_id
  encrypted  = aws_instance.ec2-instance.root_block_device[0].encrypted
  tags       = merge(var.default-tags, { "Name" : "${var.instance-name}-${each.key}" })
}

locals {
  # limited to 26 volumes
  a_to_z = split(",", "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z")
}


resource "aws_volume_attachment" "data-volume-attachments" {
  count = length(aws_ebs_volume.data-volumes)
  volume_id   = [for v in aws_ebs_volume.data-volumes : v.id][count.index]
  instance_id = aws_instance.ec2-instance.id
  device_name = "/dev/xvda${element(local.a_to_z, count.index)}"
}


resource "aws_eip" "ec2-eip" {
  count    = var.asso-eip ? 1 : 0
  instance = aws_instance.ec2-instance.id
  vpc      = true
  tags = merge(var.default-tags,
    { Name = var.instance-name }
  )
}