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# frozen_string_literal: true
# rubocop:disable Style/SignalException

require 'yaml'

SEE_DOC = "See the [changelog documentation](https://docs.gitlab.com/ee/development/changelog.html)."
CREATE_CHANGELOG_MESSAGE = <<~MSG
If you want to create a changelog entry for GitLab FOSS, run the following:

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

If you want to create a changelog entry for GitLab EE, run the following instead:

```
bin/changelog --ee -m %<mr_iid>s "%<mr_title>s"
```

If this merge request [doesn't need a CHANGELOG entry](https://docs.gitlab.com/ee/development/changelog.html#what-warrants-a-changelog-entry), feel free to ignore this message.
MSG

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?

  if yaml["merge_request"].nil? && !helper.security_mr?
    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"] && !helper.security_mr?
    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.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?
    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
end

def sanitized_mr_title
  helper.sanitize_mr_title(gitlab.mr_json["title"])
end

if git.modified_files.include?("CHANGELOG.md")
  fail "**CHANGELOG.md was edited.** Please remove the additions and create a CHANGELOG entry.\n\n" +
    format(CREATE_CHANGELOG_MESSAGE, mr_iid: gitlab.mr_json["iid"], mr_title: sanitized_mr_title)
end

changelog_found = changelog.found

if changelog_found
  check_changelog_yaml(changelog_found)
  check_changelog_path(changelog_found)
elsif changelog.needed?
  message "**[CHANGELOG missing](https://docs.gitlab.com/ee/development/changelog.html)**:\n\n" +
          format(CREATE_CHANGELOG_MESSAGE, mr_iid: gitlab.mr_json["iid"], mr_title: sanitized_mr_title)
end