# Variables
# =====================
#
variable "name" {
  type = string
  description = "Determine the name of the volume"
}

variable "persistant" {
  type = bool
  default = false
  description = "Enable destroy protection on this volume"
}


#
variable "format" {
  type = string
  default = "qcow2"
  description = "Determine the format of the image"
}

variable "file" {
  type = string
  description = "Determine the filename of the volume"
  default = ""
}


#
variable "pool" {
  type = string
  default = "default"
  description = "Determine pool to create volume within"
}

variable "pool_dir" {
  type = string
  default = "/virt"
  description = "Default path for all pools"
}

variable "size_gb" {
  type = number
  default = 0
  description = "Default size for the volume"
}


#
variable "url" {
  type = string
  default = ""
  description = "Download url for volume"
}

variable "base_pool" {
  type = string
  default = "default"
  description = "Pool of the source image"
}
variable "base_file" {
  type = string
  description = "Name of the source image"
  default = ""
}


# Variables
# =====================


    #agent=var.ssh_agent # "true"
    #host=var.ssh_host # "wks1.office.barbu-it.net"
    #user=var.ssh_user # "root"
    #password=var.password

variable "ssh_conn" {
  description = "Default settings for ssh connexion"
  type = any
  default = {
      agent = true,
      #host = "localhost",
      host = "wks1.office.barbu-it.net",
      user = null,
      password = null
  }
}



# Resources
# =====================

locals {

  # Guess things from URL
  url_split = split(".", basename( var.url ))    
  url_ext = element(local.url_split, length(local.url_split ) -1 )    
  url_file = "${var.name}.${local.url_ext}"

  # Guess things from name
  name_file = "${var.name}.${var.format}"

  # Determine resource to use
  is_baked = var.base_file != "" ? true : false
  is_sourced = var.url != "" && ! local.is_baked ? true : false
  is_created = ! local.is_baked && ! local.is_sourced ? true: false

  # Volume settings
  vol_name = coalesce(var.file, local.is_sourced ? local.url_file : local.name_file)
  size_gb = try(var.size_gb * 1024 * 1024 * 1024, null)
  id =  "${var.pool_dir}/${var.pool}/${local.vol_name}"

}


# Sourced
resource "libvirt_volume" "voldef_ephemeral_sourced" {
  count = local.is_sourced && ! var.persistant ? 1 : 0

  name = local.vol_name
  pool = var.pool
  source = local.is_sourced ? var.url : null
}

# Created
resource "libvirt_volume" "voldef_ephemeral_created" {
  count = local.is_created && ! var.persistant ? 1 : 0

  name = local.vol_name
  pool = var.pool
  source = local.is_sourced ? var.url : null
  size = local.size_gb
  format = var.format
}

# Backed
resource "libvirt_volume" "voldef_ephemeral_baked" {
  count = local.is_baked && ! var.persistant ? 1 : 0

  name = local.vol_name
  pool = var.pool

  size = local.is_baked ? try(local.size_gb, 1) : local.size_gb
  base_volume_pool = local.is_baked ? var.base_pool : null
  base_volume_name = local.is_baked ? var.base_file : null
}

# Todo: Manage persistant volumes with:
#   lifecycle {
#     prevent_destroy = false
#   }

# # Created Persistant
# resource "libvirt_volume" "voldef_ephemeral_created" {
# 
#   name = local.vol_name
#   pool = var.pool
#   source = local.is_sourced ? var.url : null
#   size = local.size_gb
#   format = var.format
# }


resource "null_resource" "voldef_persistant_created" {
  # We only support created volumes basically
  count = var.persistant ? 1 : 0
  #count = local.is_created && var.persistant ? 1 : 0
  #count = 0


  # local ssh connection, make sure to pass variables 'user' andd 'password' on cli
  # terraform apply -var user=$USER -var password=xxxxxxx
  connection { 
    type="ssh"
    # agent=var.ssh_agent # "true"
    # host=var.ssh_host # "wks1.office.barbu-it.net"
    # user=var.ssh_user # "root"
    # password=var.password

    agent =  var.ssh_conn.agent
    host=  var.ssh_conn.host
    user =  var.ssh_conn.user
    password =  var.ssh_conn.password

    #user=var.user
    #password=var.password

    
  }

  provisioner "remote-exec" {    
    inline = [
      "/opt/virt-scripts/bin/virt-vol.sh create ${local.vol_name} ${var.size_gb} ${var.pool} ${var.format}"
      #"[[ ! -f '${/virt/cloud_safe/inst_storage0_data.qcow2}' ]] || \{ qemu-img create -f '${var.format}' ${local.id} '${local.size_gb}Gb; virsh pool-refresh '${var.pool}'; \}"
      #"virsh vol-create-as --pool '${var.pool}' --name '${local.name_file}'  --format '${var.format}' --prealloc-metadata --capacity '${local.size_gb * 100000000}'"
    ]
  }

  #provisioner "file" {
  #  destination = "/tmp/script.sh"
  #  content = templatefile( 
  #    "${path.module}/script.sh.tpl", 
  #    { 
  #      "params": local.params
  #      "params_for_inline_command" : local.params_for_inline_command 
  #    } 
  #  ) 
  #}

}




# Output
# =====================

output "volume" {
  value = coalescelist(
    resource.libvirt_volume.voldef_ephemeral_sourced,
    resource.libvirt_volume.voldef_ephemeral_created,
    resource.libvirt_volume.voldef_ephemeral_baked,
    [ { id = local.id } ],
    )[0]
}

output "info" {
  value = {
    #id = local.id,
    #id = coalescelist(
    id = coalescelist(
          resource.libvirt_volume.voldef_ephemeral_sourced,
          resource.libvirt_volume.voldef_ephemeral_created,
          resource.libvirt_volume.voldef_ephemeral_baked,
          [ { id = local.id } ],
        )[0].id
    vol_name = local.vol_name,
    is_baked = local.is_baked,
    is_sourced = local.is_sourced,
    is_created = local.is_created,
    name_url = local.url_file,
    name_file = local.name_file,
    format = var.format,
    file = var.file,
    #out = [
    #  resource.libvirt_volume.voldef_ephemeral_sourced,
    #  resource.libvirt_volume.voldef_ephemeral_baked,
    #  resource.libvirt_volume.voldef_ephemeral_created,
    #  resource.null_resource.voldef_persistant_created
    #]
    #volume_id = coalescelist(
    #  resource.libvirt_volume.voldef_ephemeral_sourced,
    #  resource.libvirt_volume.voldef_ephemeral_created,
    #  resource.libvirt_volume.voldef_ephemeral_baked,
    #  resource.null_resource.voldef_persistant_created,
    #  )[0].id
  }
}