Add support for episode NFO files (#84)

* Added nfo builder for 'episodes'

* Added NFO download fields; hooked up NFO generation to downloading pipeline

* Added NFO option to media profile

lib/pinchflat/metadata/metadata_file_helpers.ex

@@ -9,6 +9,8 @@ defmodule Pinchflat.Metadata.MetadataFileHelpers do
   needed
   """
 
+  alias Pinchflat.Filesystem.FilesystemHelpers
+
   @doc """
   Compresses and stores metadata for a media item, returning the filepath.
 
@@ -18,8 +20,7 @@ defmodule Pinchflat.Metadata.MetadataFileHelpers do
     filepath = generate_filepath_for(database_record, "metadata.json.gz")
     {:ok, json} = Phoenix.json_library().encode(metadata_map)
 
-    File.mkdir_p!(Path.dirname(filepath))
-    :ok = File.write(filepath, json, [:compressed])
+    :ok = FilesystemHelpers.write_p!(filepath, json, [:compressed])
 
     filepath
   end
@@ -45,12 +46,23 @@ defmodule Pinchflat.Metadata.MetadataFileHelpers do
     filepath = generate_filepath_for(database_record, Path.basename(thumbnail_url))
     thumbnail_blob = fetch_thumbnail_from_url(thumbnail_url)
 
-    File.mkdir_p!(Path.dirname(filepath))
-    :ok = File.write(filepath, thumbnail_blob)
+    :ok = FilesystemHelpers.write_p!(filepath, thumbnail_blob)
 
     filepath
   end
 
+  @doc """
+  Parses an upload date from the YYYYMMDD string returned in yt-dlp metadata
+  and returns a Date struct.
+
+  Returns Date.t()
+  """
+  def parse_upload_date(upload_date) do
+    <<year::binary-size(4)>> <> <<month::binary-size(2)>> <> <<day::binary-size(2)>> = upload_date
+
+    Date.from_iso8601!("#{year}-#{month}-#{day}")
+  end
+
   defp fetch_thumbnail_from_url(url) do
     http_client = Application.get_env(:pinchflat, :http_client, Pinchflat.HTTP.HTTPClient)
     {:ok, body} = http_client.get(url, [], body_format: :binary)