jbox-web/redmine_git_hosting

# frozen_string_literal: true

module Repositories
  class BuildPayload < Base
    def initialize(*args)
      super
      @payloads = []
    end

    def call
      build_payloads
    end

    def refs
      options
    end

    private

    # Returns an array of GitHub post-receive hook style hashes
    # http://help.github.com/post-receive-hooks/
    #
    def build_payloads
      refs.each do |ref|
        # Get revisions range
        range = get_revisions_from_ref ref
        next if range.nil?

        @payloads << build_payload(ref, range)
      end
      @payloads
    end

    def get_revisions_from_ref(ref)
      oldhead, newhead, refname = ref.split ','

      # Only pay attention to branch updates
      return unless refname.include? 'refs/heads/'

      # Get branch name
      branch_name = refname.gsub 'refs/heads/', ''

      if newhead.match?(/\A0{40}\z/)
        # Deleting a branch
        logger.info "Deleting branch '#{branch_name}'"
        range = nil
      elsif oldhead.match?(/\A0{40}\z/)
        # Creating a branch
        logger.info "Creating branch '#{branch_name}'"
        range = newhead
      else
        range = "#{oldhead}..#{newhead}"
      end

      range
    end

    def build_payload(ref, range)
      revisions_in_range = get_revisions_in_range range
      logger.debug "Revisions in range : #{revisions_in_range.join ' '}"

      # Get refs
      oldhead, newhead, refname = ref.split ','

      # Build payload hash
      repository.github_payload
                .merge({ before: oldhead, after: newhead, ref: refname, commits: build_commits_list(revisions_in_range) })
    end

    def build_commits_list(revisions_in_range)
      commits_list = []
      revisions_in_range.each do |rev|
        changeset = repository.find_changeset_by_name rev
        next if changeset.nil?

        commits_list << changeset.github_payload
      end
      commits_list
    end

    def get_revisions_in_range(range)
      repository.rev_list range, ['--reverse']
    end
  end
end