defmodule GogsHelpers do
  @moduledoc """
  Helper functions that can be unit tested independently of the main functions.
  If you spot any way to make these better, please share:
  https://github.com/dwyl/gogs/issues
  """
  require Logger
  # @env_required ~w/GOGS_URL GOGS_SSH_PORT GOGS_ACCESS_TOKEN/
  @cwd File.cwd!()
  @git_dir Envar.get("GIT_TEMP_DIR_PATH", @cwd)
  @mock Application.compile_env(:gogs, :mock)

  @doc """
  `api_base_url/0` returns the `Gogs` Server REST API url for API requests.

  ## Examples
    iex> GogsHelpers.api_base_url()
    "https://gogs-server.fly.dev/api/v1/"
  """
  @spec api_base_url() :: String.t()
  def api_base_url do
    "https://#{Envar.get("GOGS_URL")}/api/v1/"
  end

  @doc """
  `make_url/2` constructs the URL based on the supplied git `url` and TCP `port`.
  If the `port` is set it will be a custom Gogs instance.

  ## Examples
    iex> GogsHelpers.make_url("gogs-server.fly.dev", "10022")
    "ssh://git@gogs-server.fly.dev:10022/"

    iex> GogsHelpers.make_url("github.com")
    "git@github.com:"

  """
  @spec make_url(String.t(), integer() | nil) :: String.t()
  def make_url(git_url, port \\ 0)
  def make_url(git_url, port) when port > 0, do: "ssh://git@#{git_url}:#{port}/"
  def make_url(git_url, _port), do: "git@#{git_url}:"

  @doc """
  `remote_url/3` returns the git remote url.
  """
  @spec remote_url(String.t(), String.t(), String.t()) :: String.t()
  def remote_url(base_url, org, repo) do
    "#{base_url}#{org}/#{repo}.git"
  end

  @doc """
  `remote_url_ssh/2` returns the remote ssh url for cloning.
  """
  @spec remote_url_ssh(String.t(), String.t()) :: String.t()
  def remote_url_ssh(org, repo) do
    url = Envar.get("GOGS_URL")
    port = Envar.get("GOGS_SSH_PORT")
    git_url = GogsHelpers.make_url(url, port)
    remote_url(git_url, org, repo)
  end

  @spec get_org_repo_names(String.t()) :: {String.t(), String.t()}
  defp get_org_repo_names(url) do
    [org, repo] =
      url
      |> String.split("/")
      |> Enum.take(-2)

    {org, repo}
  end

  @doc """
  `get_repo_name_from_url/1` extracts the repository name from a .git url.
  Feel free to refactor/simplify this function if you want.
  """
  @spec get_repo_name_from_url(String.t()) :: String.t()
  def get_repo_name_from_url(url) do
    {_org, repo} = get_org_repo_names(url)
    String.split(repo, ".git") |> List.first()
  end

  @doc """
  `get_org_name_from_url/1` extracts the organisation name from a .git url.
  ssh://git@gogs-server.fly.dev:10022/theorg/myrepo.git
  """
  @spec get_org_name_from_url(String.t()) :: String.t()
  def get_org_name_from_url(url) do
    {org, _repo} = get_org_repo_names(url)
    org
  end

  @doc """
  `local_repo_path/2` returns the full system path for the cloned repo
  on the `localhost` i.e. the Elixir/Phoenix server that cloned it.
  """
  @spec local_repo_path(String.t(), String.t()) :: binary()
  def local_repo_path(org, repo) do
    # coveralls-ignore-start
    if @mock do
      if String.contains?(repo, "no-repo") do
        # in branch test we need to simulate a full path not a test-repo one ...
        Path.join([temp_dir(@git_dir), org, repo]) |> Path.expand()
      else
        Path.join([temp_dir(@git_dir), "test-repo"]) |> Path.expand()
      end
    else
      Path.join([temp_dir(@git_dir), org, repo]) |> Path.expand()
    end

    # coveralls-ignore-stop
  end

  @doc """
  `local_git_repo/2` returns the `%Git.Repository{}` (struct) for an `org` and `repo`
  on the `localhost`. This is used by the `Git` module to perform operations.
  """
  @spec local_git_repo(String.t(), String.t()) :: Git.Repository.t()
  def local_git_repo(org, repo) do
    %Git.Repository{path: local_repo_path(org, repo)}
  end

  @doc """
  `temp_dir/1` returns the Current Working Directory (CWD).
  Made this a function in case we want to change the location of the
  directory later e.g. to a temporary directory. 
  """
  @spec temp_dir(String.t() | nil) :: binary()
  def temp_dir(dir \\ nil) do
    # Logger.info("temp_dir: #{dir} ")
    if dir && File.exists?(dir) do
      dir
      # coveralls-ignore-start
    else
      File.cwd!()
      # coveralls-ignore-stop
    end
  end
end