# rubocop:disable Style/SignalException

require 'yaml'

NO_CHANGELOG_LABELS = %w[backstage QA test].freeze
SEE_DOC = "See [the documentation](https://docs.gitlab.com/ce/development/changelog.html).".freeze
MISSING_CHANGELOG_MESSAGE = <<~MSG.freeze
**[CHANGELOG missing](https://docs.gitlab.com/ce/development/changelog.html).**

You can create one with:

```
bin/changelog -m %<mr_iid>s
```

If your merge request doesn't warrant a CHANGELOG entry,
consider adding any of the %<labels>s labels.
#{SEE_DOC}
MSG

def ee?
  ENV['CI_PROJECT_NAME'] == 'gitlab-ee' || File.exist?('../../CHANGELOG-EE.md')
end

def ee_changelog?(changelog_path)
  changelog_path =~ /unreleased-ee/
end

def ce_port_changelog?(changelog_path)
  ee? && !ee_changelog?(changelog_path)
end

def check_changelog(path)
  yaml = YAML.safe_load(File.read(path))

  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?

  if yaml["merge_request"].nil?
    message "Consider setting `merge_request` to #{gitlab.mr_json["iid"]} in #{gitlab.html_link(path)}. #{SEE_DOC}"
  elsif yaml["merge_request"] != gitlab.mr_json["iid"] && !ce_port_changelog?(changelog_path)
    fail "Merge request ID was not set to #{gitlab.mr_json["iid"]}! #{SEE_DOC}"
  end
rescue StandardError
  # YAML could not be parsed, fail the build.
  fail "#{gitlab.html_link(path)} isn't valid YAML! #{SEE_DOC}"
end

def presented_no_changelog_labels
  NO_CHANGELOG_LABELS.map { |label| "~#{label}" }.join(', ')
end

changelog_needed = (gitlab.mr_labels & NO_CHANGELOG_LABELS).empty?
changelog_found = git.added_files.find { |path| path =~ %r{\A(ee/)?(changelogs/unreleased)(-ee)?/} }

if git.modified_files.include?("CHANGELOG.md")
  fail "CHANGELOG.md was edited. Please remove the additions and create an entry with `bin/changelog -m #{gitlab.mr_json["iid"]}` instead."
end

if changelog_needed
  if changelog_found
    check_changelog(path)
  else
    warn format(MISSING_CHANGELOG_MESSAGE, mr_iid: gitlab.mr_json["iid"], labels: presented_no_changelog_labels)
  end
end