data "aws_default_tags" "this" {
  lifecycle {
    postcondition {
      condition     = length(self.tags) >= 1
      error_message = "Validation failed: Provider default_tags not set."
    }
  }
}

resource "aws_security_group" "sg" {
  name        = var.name
  description = var.description
  vpc_id      = var.vpc-id
  tags        = { Name = var.name }
}

resource "aws_vpc_security_group_ingress_rule" "ingress-rules" {
  for_each                     = var.ingress
  security_group_id            = aws_security_group.sg.id
  ip_protocol                  = split(",", each.value)[0]
  from_port                    = split(",", each.value)[1]
  to_port                      = split(",", each.value)[2]
  cidr_ipv4                    = can(regex("^([0-9]+\\.){3}[0-9]+\\/[0-9]+$", split(",", each.value)[3])) ? split(",", each.value)[3] : null
  cidr_ipv6                    = strcontains(split(",", each.value)[3], "::") ? split(",", each.value)[3] : null
  referenced_security_group_id = substr(split(",", each.value)[3], 0, 2) == "sg" ? split(",", each.value)[3] : null
  prefix_list_id               = substr(split(",", each.value)[3], 0, 2) == "pl" ? split(",", each.value)[3] : null
  description                  = split(",", each.value)[4]
}

resource "aws_vpc_security_group_egress_rule" "egress-rules" {
  for_each                     = var.egress
  security_group_id            = aws_security_group.sg.id
  ip_protocol                  = split(",", each.value)[0]
  from_port                    = split(",", each.value)[1]
  to_port                      = split(",", each.value)[2]
  cidr_ipv4                    = can(regex("^([0-9]+\\.){3}[0-9]+\\/[0-9]+$", split(",", each.value)[3])) ? split(",", each.value)[3] : null
  cidr_ipv6                    = strcontains(split(",", each.value)[3], "::") ? split(",", each.value)[3] : null
  referenced_security_group_id = substr(split(",", each.value)[3], 0, 2) == "sg" ? split(",", each.value)[3] : null
  prefix_list_id               = substr(split(",", each.value)[3], 0, 2) == "pl" ? split(",", each.value)[3] : null
  description                  = split(",", each.value)[4]
}