/**
 *    Copyright 2016-2017 PeopleWare n.v.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

data "external" "calculated_meta" {
  program = [
    "node",
    "${path.module}/js/index.js",
    "next-meta",
    "${local.clean_domain_name}",
  ]
}

data "null_data_source" "meta" {
  inputs = "${merge(data.external.calculated_meta.result, var.additional_meta)}"
}

/**
 * A TXT record, called `meta.${var.domain_name}`, that has given ${var.meta} as payload,
 * extended with `serial=${var.serial}`. This follows https://tools.ietf.org/html/rfc1464.
 * See HowtoDefineMultiStringTXTRecords.md
 */
resource "aws_route53_record" "meta" {
  zone_id = "${var.zone_id}"
  name    = "meta.${local.clean_domain_name}"
  type    = "TXT"
  ttl     = "${var.ttl}"
  records = ["${join("\"\"", formatlist("%s=%s", keys(data.null_data_source.meta.inputs), values(data.null_data_source.meta.inputs)))}"]
}

# Tags the git repo with the calculated and executed serial, under `serial/${domain_name}/SERIAL
# The domain name is necessary in the tag for when this module is used more than once in the same configuration,
# for different domains. Otherwise, both uses would try to apply the same tag to the git repo. The second application
# attempt would fail.
# Depending on versions, an FQDN received from AWS might or might not end with a trailing dot `"."`.
# We remove the dot from `${domain_name}`, if it occurs.
data "external" "tag" {
  program = [
    "node",
    "${path.module}/js/index.js",
    "tag",
    "serial/${local.clean_domain_name}/${data.external.calculated_meta.result.serial}",
  ]

  depends_on = ["aws_route53_record.meta"]
}