# frozen_string_literal: true
# rubocop:disable Style/SignalException

require 'yaml'

SEE_DOC = "See the [changelog documentation](https://docs.gitlab.com/ee/development/changelog.html)."

SUGGEST_MR_COMMENT = <<~SUGGEST_COMMENT
```suggestion
merge_request: %<mr_iid>s
```

#{SEE_DOC}
SUGGEST_COMMENT

def check_changelog_yaml(path)
  raw_file = File.read(path)
  yaml = YAML.safe_load(raw_file)

  fail "`title` should be set, in #{gitlab.html_link(path)}! #{SEE_DOC}" if yaml["title"].nil?
  fail "`type` should be set, in #{gitlab.html_link(path)}! #{SEE_DOC}" if yaml["type"].nil?

  return if helper.security_mr?

  cherry_pick_against_stable_branch = helper.cherry_pick_mr? && helper.stable_branch?

  if yaml["merge_request"].nil?
    mr_line = raw_file.lines.find_index("merge_request:\n")

    if mr_line
      markdown(format(SUGGEST_MR_COMMENT, mr_iid: gitlab.mr_json["iid"]), file: path, line: mr_line.succ)
    else
      message "Consider setting `merge_request` to #{gitlab.mr_json["iid"]} in #{gitlab.html_link(path)}. #{SEE_DOC}"
    end
  elsif yaml["merge_request"] != gitlab.mr_json["iid"] && !cherry_pick_against_stable_branch
    fail "Merge request ID was not set to #{gitlab.mr_json["iid"]}! #{SEE_DOC}"
  end
rescue Psych::SyntaxError, Psych::DisallowedClass, Psych::BadAlias
  # YAML could not be parsed, fail the build.
  fail "#{gitlab.html_link(path)} isn't valid YAML! #{SEE_DOC}"
rescue StandardError => e
  warn "There was a problem trying to check the Changelog. Exception: #{e.class.name} - #{e.message}"
end

def check_changelog_path(path)
  ee_changes = helper.all_ee_changes.dup
  ee_changes.delete(path)

  if ee_changes.any? && !changelog.ee_changelog? && !changelog.db_changes?
    warn "This MR has a Changelog file outside `ee/`, but code changes in `ee/`. Consider moving the Changelog file into `ee/`."
  end

  if ee_changes.empty? && changelog.ee_changelog?
    warn "This MR has a Changelog file in `ee/`, but no code changes in `ee/`. Consider moving the Changelog file outside `ee/`."
  end

  if ee_changes.any? && changelog.ee_changelog? && changelog.db_changes?
    warn "This MR has a Changelog file inside `ee/`, but there are database changes which [requires](https://docs.gitlab.com/ee/development/changelog.html#what-warrants-a-changelog-entry) the Changelog placement to be outside of `ee/`. Consider moving the Changelog file outside `ee/`."
  end
end

if git.modified_files.include?("CHANGELOG.md")
  fail changelog.modified_text
end

changelog_found = changelog.found

if changelog_found
  check_changelog_yaml(changelog_found)
  check_changelog_path(changelog_found)
elsif changelog.required?
  fail changelog.required_text
elsif changelog.optional?
  message changelog.optional_text
end