ManageIQ/miq_bot

require 'rugged'

module CommitMonitorHandlers::CommitRange
  class GithubPrCommenter::DiffFilenameChecker
    include Sidekiq::Worker
    sidekiq_options :queue => :miq_bot_glacial

    include BatchEntryWorkerMixin
    include BranchWorkerMixin

    def perform(batch_entry_id, branch_id, _new_commits)
      return unless find_batch_entry(batch_entry_id)
      return skip_batch_entry unless find_branch(branch_id, :pr)

      complete_batch_entry(:result => process_files)
    end

    private

    def process_files
      @offenses = []

      check_diff_files

      @offenses
    end

    def check_diff_files
      branch.git_service.diff.new_files.each do |file|
        validate_migration_timestamp(file)
      end
    rescue GitService::UnmergeableError
      nil # Avoid working on unmergeable PRs
    end

    def validate_migration_timestamp(file)
      return unless file.include?("db/migrate/")
      ts = File.basename(file).split("_").first
      return if valid_timestamp?(ts)

      @offenses << OffenseMessage::Entry.new(:error, "Bad Migration Timestamp", file)
    end

    def valid_timestamp?(ts)
      Time.parse(ts)
    rescue ArgumentError
      false
    end
  end
end