module Repository
  include GitHost

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

  def empty_repo?
    !repo_exists? || !has_commits?
  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 last_commit_for(ref, path = nil)
    commits(ref, path, 1).first
  end

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

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

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

  # Returns an Array of branch names
  def branch_names
    repo.branches.collect(&:name).sort
  end

  # Returns an Array of Branches
  def branches
    repo.branches.sort_by(&:name)
  end

  # Returns an Array of tag names
  def tag_names
    repo.tags.collect(&:name).sort.reverse
  end

  # Returns an Array of Tags
  def tags
    repo.tags.sort_by(&:name).reverse
  end

  # Returns an Array of branch and tag names
  def ref_names
    [branch_names + tag_names].flatten
  end

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

  def url_to_repo
    git_host.url_to_repo(path_with_namespace)
  end

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

  def namespace_dir
    namespace.try(:path) || ''
  end

  def update_repository
    git_host.update_repository(self)
  end

  def destroy_repository
    git_host.remove_repository(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

  # Discovers the default branch based on the repository's available branches
  #
  # - If no branches are present, returns nil
  # - If one branch is present, returns its name
  # - If two or more branches are present, returns the one that has a name
  #   matching root_ref (default_branch or 'master' if default_branch is nil)
  def discover_default_branch
    if branch_names.length == 0
      nil
    elsif branch_names.length == 1
      branch_names.first
    else
      branch_names.select { |v| v == root_ref }.first
    end
  end

  def has_commits?
    !!commit
  rescue Grit::NoSuchPathError
    false
  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.path + "-" + commit.id.to_s + ".tar.gz"
    storage_path = Rails.root.join("tmp", "repositories", self.path)
    file_path = File.join(storage_path, file_name)

    # Put files into a directory before archiving
    prefix = self.path + "/"

    # Create file if not exists
    unless File.exists?(file_path)
      FileUtils.mkdir_p storage_path
      file = self.repo.archive_to_file(ref, prefix,  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_with_namespace, ".git"].join('')
  end

  # Check if current branch name is marked as protected in the system
  def protected_branch? branch_name
    protected_branches.map(&:name).include?(branch_name)
  end
end