module Repository
  def valid_repo?
    repo
  rescue
    errors.add(:path, "Invalid repository path")
    false
  end

  def commit(commit_id = nil)
    Commit.find_or_first(repo, commit_id, root_ref)
  end

  def fresh_commits(n = 10)
    Commit.fresh_commits(repo, n)
  end

  def commits_with_refs(n = 20)
    Commit.commits_with_refs(repo, n)
  end

  def commits_since(date)
    Commit.commits_since(repo, date)
  end

  def commits(ref, path = nil, limit = nil, offset = nil)
    Commit.commits(repo, ref, path, limit, offset)
  end

  def commits_between(from, to)
    Commit.commits_between(repo, from, to)
  end

  def write_hooks
    %w(post-receive).each do |hook|
      write_hook(hook, File.read(File.join(Rails.root, 'lib', "#{hook}-hook")))
    end
  end

  def satellite
    @satellite ||= Gitlab::Satellite.new(self)
  end

  def write_hook(name, content)
    hook_file = File.join(path_to_repo, 'hooks', name)

    File.open(hook_file, 'w') do |f|
      f.write(content)
    end

    File.chmod(0775, hook_file)
  end

  def has_post_receive_file?
    hook_file = File.join(path_to_repo, 'hooks', 'post-receive')
    File.exists?(hook_file) 
  end

  def tags
    repo.tags.map(&:name).sort.reverse
  end

  def repo
    @repo ||= Grit::Repo.new(path_to_repo)
  end

  def url_to_repo
    Gitlab::GitHost.url_to_repo(path)
  end

  def path_to_repo
    File.join(Gitlab.config.git_base_path, "#{path}.git")
  end

  def update_repository
    Gitlab::GitHost.system.update_project(path, self)

    write_hooks if File.exists?(path_to_repo)
  end

  def destroy_repository
    Gitlab::GitHost.system.destroy_project(self)
  end

  def repo_exists?
    @repo_exists ||= (repo && !repo.branches.empty?)
  rescue 
    @repo_exists = false
  end

  def heads
    @heads ||= repo.heads
  end

  def tree(fcommit, path = nil)
    fcommit = commit if fcommit == :head
    tree = fcommit.tree
    path ? (tree / path) : tree
  end

  def open_branches
    if protected_branches.empty?
      self.repo.heads
    else
      pnames = protected_branches.map(&:name)
      self.repo.heads.reject { |h| pnames.include?(h.name) }
    end.sort_by(&:name)
  end

  def has_commits?
    !!commit
  end

  def root_ref 
    default_branch || "master"
  end

  def root_ref? branch
    root_ref == branch
  end

  # Archive Project to .tar.gz
  #
  # Already packed repo archives stored at 
  # app_root/tmp/repositories/project_name/project_name-commit-id.tag.gz
  #
  def archive_repo ref
    ref = ref || self.root_ref
    commit = self.commit(ref)
    return nil unless commit

    # Build file path
    file_name = self.code + "-" + commit.id.to_s + ".tar.gz"
    storage_path = File.join(Rails.root, "tmp", "repositories", self.code)
    file_path = File.join(storage_path, file_name)

    # Create file if not exists
    unless File.exists?(file_path)
      FileUtils.mkdir_p storage_path
      file = self.repo.archive_to_file(ref, nil,  file_path)
    end

    file_path
  end

  def ssh_url_to_repo
    url_to_repo
  end

  def http_url_to_repo
    http_url = [Gitlab.config.url, "/", path, ".git"].join()
  end
end