variable "repositories" {
  description = "Image names to create repositories for. Each becomes <namespace>/<name>, and each must match the basename of the IMAGE_NAME the pushing repo uses. Adding an image is adding a string."
  type        = list(string)

  validation {
    condition     = length(var.repositories) == length(toset(var.repositories))
    error_message = "repositories must not contain duplicates."
  }

  validation {
    condition     = alltrue([for r in var.repositories : can(regex("^[a-z0-9][a-z0-9._-]*$", r))])
    error_message = "Each repository name must be lowercase alphanumeric, optionally with . _ or -, and must not start with a separator."
  }
}

variable "namespace" {
  description = "Prefix shared by every repository, giving names like lance-blue/arena. It is the last path segment of push_registry, so changing it changes what the pushing repos are told."
  type        = string
  default     = "lance-blue"
}

variable "image_tag_mutability" {
  description = "MUTABLE or IMMUTABLE, for every repository here. IMMUTABLE since arena started tagging per build; see the comment in main.tf. MUTABLE is an escape hatch, not a default to drift back to."
  type        = string
  default     = "IMMUTABLE"

  validation {
    condition     = contains(["MUTABLE", "IMMUTABLE"], var.image_tag_mutability)
    error_message = "image_tag_mutability must be MUTABLE or IMMUTABLE."
  }
}

variable "retained_image_count" {
  description = "How many images to keep per repository. The arena image is around a gigabyte at $0.10/GB-month."
  type        = number
  default     = 10
}

variable "untagged_expiry_days" {
  description = "Days before an untagged image is expired. Untagged images are what a re-pushed tag leaves behind."
  type        = number
  default     = 7
}

variable "tags" {
  description = "Tags to merge into every resource."
  type        = map(string)
  default     = {}
}