Download video(s) (first iteration) (#5)

* Updated package.json (and made an excuse to make a branch) * Video filepath parser (#6) * Restructured files; Added parser placeholder * More restructuring * Added basic parser for hydrating template strings * Improved docs * More docs * Initial implementation of media profiles (#7) * [WIP] Added basic video download method * [WIP] Very-WIP first steps at parsing options and downloading * Made my options safe by default and removed special safe versions * Ran html generator for mediaprofile model - leaving as-is for now * Addressed a bunch of TODO comments * Add "channel" type Media Source (#8) * [WIP] Working on fetching channel metadata in yt-dlp backend * Finished first draft of methods to do with querying channels * Renamed CommandRunnerMock to have a more descriptive name * Ran the phx generator for the channel model * Renamed Downloader namespace to MediaClient * [WIP] saving before attempting LiveView * LiveView did not work out but here's a working controller how about * Index a channel (#9) * Ran a MediaItem generator; Reformatted to my liking * [WIP] added basic index function * setup oban * Added basic Oban job for indexing * Added in workers for indexing; hooked them into record creation flow * Added a task model with a phx generator * Tied together tasks with jobs and channels * Download indexed videos (#10) * Clarified documentation * more comments * [WIP] hooked up basic video downloading; starting work on metadata * Added metadata model and parsing Adding the metadata model made me realize that, in many cases, yt-dlp returns undesired input in stdout, breaking parsing. In order to get the metadata model working, I had to change the way in which the app interacts with yt-dlp. Now, output is written as a file to disk which is immediately re-read and returned. * Added tests for video download worker * Hooked up video downloading to the channel indexing pipeline * Adds tasks for media items * Updated video metadata parser to extract the title * Ran linting
2024-01-30 20:15:59 -08:00
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+defmodule Pinchflat.MediaClient.VideoDownloader do
+  @moduledoc """
+  This is the integration layer for actually downloading videos.
+  It takes into account the media profile's settings in order
+  to download the video with the desired options.
+
+  Technically hardcodes the yt-dlp backend for now, but should leave
+  it open-ish for future expansion (just in case).
+  """
+
+  alias Pinchflat.Repo
+  alias Pinchflat.Media
+  alias Pinchflat.Media.MediaItem
+  alias Pinchflat.Profiles.MediaProfile
+
+  alias Pinchflat.MediaClient.Backends.YtDlp.Video, as: YtDlpVideo
+  alias Pinchflat.Profiles.Options.YtDlp.OptionBuilder, as: YtDlpOptionBuilder
+  alias Pinchflat.MediaClient.Backends.YtDlp.MetadataParser, as: YtDlpMetadataParser
+
+  @doc """
+  Downloads a video for a media item, updating the media item based on the metadata
+  returned by the backend. Also saves the entire metadata response to the associated
+  media_metadata record.
+
+  Returns {:ok, %MediaItem{}} | {:error, any, ...any}
+  """
+  def download_for_media_item(%MediaItem{} = media_item, backend \\ :yt_dlp) do
+    item_with_preloads = Repo.preload(media_item, [:metadata, channel: :media_profile])
+    media_profile = item_with_preloads.channel.media_profile
+
+    case download_for_media_profile(media_item.media_id, media_profile, backend) do
+      {:ok, parsed_json} ->
+        parser = metadata_parser(backend)
+        parsed_attrs = parser.parse_for_media_item(parsed_json)
+
+        # Don't forgor to use preloaded associations or updates to
+        # associations won't work!
+        Media.update_media_item(item_with_preloads, parsed_attrs)
+
+      err ->
+        err
+    end
+  end
+
+  defp download_for_media_profile(url, %MediaProfile{} = media_profile, backend) do
+    option_builder = option_builder(backend)
+    video_backend = video_backend(backend)
+    {:ok, options} = option_builder.build(media_profile)
+
+    video_backend.download(url, options)
+  end
+
+  defp option_builder(backend) do
+    case backend do
+      :yt_dlp -> YtDlpOptionBuilder
+    end
+  end
+
+  defp video_backend(backend) do
+    case backend do
+      :yt_dlp -> YtDlpVideo
+    end
+  end
+
+  defp metadata_parser(backend) do
+    case backend do
+      :yt_dlp -> YtDlpMetadataParser
+    end
+  end
+end