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path: root/app/services/merge_requests/build_service.rb
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module MergeRequests
  class BuildService < MergeRequests::BaseService
    def execute
      merge_request = MergeRequest.new(params)

      # Set MR attributes
      merge_request.can_be_created = false
      merge_request.compare_commits = []
      merge_request.source_project = project unless merge_request.source_project
      merge_request.target_project ||= (project.forked_from_project || project)
      merge_request.target_branch ||= merge_request.target_project.default_branch

      if merge_request.target_branch.blank? || merge_request.source_branch.blank?
        message =
          if params[:source_branch] || params[:target_branch]
            "You must select source and target branch"
          end

        return build_failed(merge_request, message)
      end

      compare = CompareService.new.execute(
        merge_request.source_project,
        merge_request.source_branch,
        merge_request.target_project,
        merge_request.target_branch,
      )

      commits = compare.commits

      # At this point we decide if merge request can be created
      # If we have at least one commit to merge -> creation allowed
      if commits.present?
        merge_request.compare_commits = Commit.decorate(commits, merge_request.source_project)
        merge_request.can_be_created = true
        merge_request.compare = compare
      else
        merge_request.can_be_created = false
      end

      commits = merge_request.compare_commits
      if commits && commits.count == 1
        commit = commits.first
        merge_request.title       = commit.title
        merge_request.description ||= commit.description.try(:strip)
      else
        merge_request.title = merge_request.source_branch.titleize.humanize
      end

      # When your branch name starts with an iid followed by a dash this pattern will
      # be interpreted as the use wants to close that issue on this project
      # Pattern example: 112-fix-mep-mep
      # Will lead to appending `Closes #112` to the description
      if match = merge_request.source_branch.match(/\A(\d+)-/)
        iid = match[1]
        closes_issue = "Closes ##{iid}"

        if merge_request.description.present?
          merge_request.description << closes_issue.prepend("\n")
        else
          merge_request.description = closes_issue
        end
      end

      merge_request
    end

    def build_failed(merge_request, message)
      merge_request.errors.add(:base, message) unless message.nil?
      merge_request.compare_commits = []
      merge_request.can_be_created = false
      merge_request
    end
  end
end