variable "listeners" {
  description = "Listeners to attach to ALB. A http-https-redirect-listener will be created automatically if 'enable_http_https_redirect = true'"
  default     = {}

  type = map(object({
    port     = number
    protocol = optional(string, "HTTP")

    # Default behaviours
    fixed_response = optional(object({
      content_type = optional(string, "text/plain")
      message_body = optional(string)
      status_code  = optional(string)
    }))

    forward = optional(object({
      target_groups = list(object({
        name   = optional(string, null)
        weight = optional(number)
      }))
      stickiness = object({
        duration = optional(number)
        enabled  = optional(bool, false)
      })
    }))

    redirect = optional(object({
      host        = optional(string, "#{host}")
      path        = optional(string, "#{path}")
      port        = optional(string, "#{port}")
      protocol    = optional(string, "#{protocol}")
      query       = optional(string, "#{query}")
      status_code = optional(string, "HTTP_301")
    }))

    # Listener rules
    rules = map(object({
      type = optional(string)
      fixed_response = optional(object({
        content_type = optional(string)
        message_body = optional(string)
        status_code  = optional(string)
      }))

      forward = optional(object({
        target_groups = list(object({
          name   = string
          weight = optional(number)
        }))
        stickiness = object({
          duration = number
          enabled  = optional(bool, false)
        })
      }))

      redirect = optional(object({
        host        = optional(string, "#{host}")
        path        = optional(string, "#{path}")
        port        = optional(string, "#{port}")
        protocol    = optional(string, "#{protocol}")
        query       = optional(string, "#{query}")
        status_code = optional(string, "HTTP_301")
      }))
    }))
  }))

  validation {
    condition = alltrue([
      for listener in var.listeners : contains([80, 443], listener.port)
    ])
    error_message = "listener 'port' value should be '80' or '443'"
  }

  validation {
    condition = alltrue([
      for listener in var.listeners : contains(["HTTP", "HTTPS"], listener.protocol)
    ])
    error_message = "listener 'protocol' value should be 'HTTP' or 'HTTPS'"
  }
}