[Enhancement] Add Media Center support for videos uploaded on the same day (#221)

* Added upload date index field to media_items

* Added incrementing index for upload dates

* Added media item upload date index to download option builder

* Added new season_episode_index_from_date to UI; updated parser

* Improve support for channels

* Hopefully fixed flakey test

lib/pinchflat/downloading/download_option_builder.ex

@@ -35,12 +35,19 @@ defmodule Pinchflat.Downloading.DownloadOptionBuilder do
   Builds the output path for yt-dlp to download media based on the given source's
   media profile. Uses the source's override output path template if it exists.
 
+  Accepts a %MediaItem{} or %Source{} struct. If a %Source{} struct is passed, it
+  will use a default %MediaItem{} struct with the given source.
+
   Returns binary()
   """
-  def build_output_path_for(%Source{} = source_with_preloads) do
-    output_path_template = Sources.output_path_template(source_with_preloads)
+  def build_output_path_for(%MediaItem{} = media_item_with_preloads) do
+    output_path_template = Sources.output_path_template(media_item_with_preloads.source)
 
-    build_output_path(output_path_template, source_with_preloads)
+    build_output_path(output_path_template, media_item_with_preloads)
+  end
+
+  def build_output_path_for(%Source{} = source_with_preloads) do
+    build_output_path_for(%MediaItem{source: source_with_preloads})
   end
 
   defp default_options do
@@ -168,23 +175,29 @@ defmodule Pinchflat.Downloading.DownloadOptionBuilder do
 
   defp output_options(media_item_with_preloads) do
     [
-      output: build_output_path_for(media_item_with_preloads.source)
+      output: build_output_path_for(media_item_with_preloads)
     ]
   end
 
-  defp build_output_path(string, source) do
-    additional_options_map = output_options_map(source)
+  defp build_output_path(string, media_item_with_preloads) do
+    additional_options_map = output_options_map(media_item_with_preloads)
     {:ok, output_path} = OutputPathBuilder.build(string, additional_options_map)
 
     Path.join(base_directory(), output_path)
   end
 
-  defp output_options_map(source) do
+  defp output_options_map(media_item_with_preloads) do
+    source = media_item_with_preloads.source
+
     %{
       "source_custom_name" => source.custom_name,
       "source_collection_id" => source.collection_id,
       "source_collection_name" => source.collection_name,
-      "source_collection_type" => source.collection_type
+      "source_collection_type" => to_string(source.collection_type),
+      "media_upload_date_index" =>
+        media_item_with_preloads.upload_date_index
+        |> to_string()
+        |> String.pad_leading(2, "0")
     }
   end
 
@@ -198,7 +211,7 @@ defmodule Pinchflat.Downloading.DownloadOptionBuilder do
     |> String.split(~r{\.}, include_captures: true)
     |> List.insert_at(-3, "-thumb")
     |> Enum.join()
-    |> build_output_path(media_item_with_preloads.source)
+    |> build_output_path(media_item_with_preloads)
   end
 
   defp base_directory do

lib/pinchflat/downloading/output_path_builder.ex

@@ -9,13 +9,23 @@ defmodule Pinchflat.Downloading.OutputPathBuilder do
   Builds the actual final filepath from a given template. Optionally, you can pass in
   a map of additional options to be used in the template.
 
+  Custom options are recursively expanded _once_ so you can nest custom options
+  one-deep if needed.
+
   Translates liquid-style templates into yt-dlp-style templates,
   leaving yt-dlp syntax intact.
   """
   def build(template_string, additional_template_options \\ %{}) do
     combined_options = Map.merge(custom_yt_dlp_option_map(), additional_template_options)
 
-    TemplateParser.parse(template_string, combined_options, &identifier_fn/2)
+    expanded_options =
+      Enum.map(combined_options, fn {key, value} ->
+        {:ok, parse_result} = TemplateParser.parse(value, combined_options, &identifier_fn/2)
+
+        {key, parse_result}
+      end)
+
+    TemplateParser.parse(template_string, Map.new(expanded_options), &identifier_fn/2)
   end
 
   # The `nil` case simply wraps the identifier in yt-dlp-style syntax. This assumes that
@@ -43,6 +53,7 @@ defmodule Pinchflat.Downloading.OutputPathBuilder do
       "upload_yyyy_mm_dd" => "%(upload_date>%Y-%m-%d)S",
       "season_from_date" => "%(upload_date>%Y)S",
       "season_episode_from_date" => "s%(upload_date>%Y)Se%(upload_date>%m%d)S",
+      "season_episode_index_from_date" => "s%(upload_date>%Y)Se%(upload_date>%m%d)S{{ media_upload_date_index }}",
       "artist_name" => "%(artist,creator,uploader,uploader_id)S"
     }
   end