From f6fd0775d93c86d07a42998353064b90002bf5b3 Mon Sep 17 00:00:00 2001
From: Kieran Eglin <kieran.eglin@gmail.com>
Date: Sat, 20 Jan 2024 20:34:29 -0800
Subject: [PATCH] [WIP] Added basic video download method

---
 config/config.exs                             |  4 ++-
 config/dev.exs                                |  3 ++
 config/test.exs                               |  3 +-
 .../downloader/backends/yt_dlp/video.ex       | 34 +++++++++++++++++++
 4 files changed, 42 insertions(+), 2 deletions(-)
 create mode 100644 lib/pinchflat/downloader/backends/yt_dlp/video.ex

diff --git a/config/config.exs b/config/config.exs
index fd3d9f1..92bd240 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -12,7 +12,9 @@ config :pinchflat,
   generators: [timestamp_type: :utc_datetime],
   # Specifying backend data here makes mocking and local testing SUPER easy
   yt_dlp_executable: System.find_executable("yt-dlp"),
-  yt_dlp_runner: Pinchflat.Downloader.Backends.YtDlp.CommandRunner
+  yt_dlp_runner: Pinchflat.Downloader.Backends.YtDlp.CommandRunner,
+  # TODO: figure this out
+  media_directory: :not_implemented
 
 # Configures the endpoint
 config :pinchflat, PinchflatWeb.Endpoint,
diff --git a/config/dev.exs b/config/dev.exs
index a3bc3e4..847ef3c 100644
--- a/config/dev.exs
+++ b/config/dev.exs
@@ -1,5 +1,8 @@
 import Config
 
+config :pinchflat,
+  media_directory: Path.join([System.tmp_dir!(), "yt-dlp"])
+
 # Configure your database
 config :pinchflat, Pinchflat.Repo,
   username: System.get_env("POSTGRES_USER"),
diff --git a/config/test.exs b/config/test.exs
index 20d03ff..1ca2159 100644
--- a/config/test.exs
+++ b/config/test.exs
@@ -2,7 +2,8 @@ import Config
 
 config :pinchflat,
   # Specifying backend data here makes mocking and local testing SUPER easy
-  yt_dlp_executable: Path.join([File.cwd!(), "/test/support/scripts/yt-dlp-mocks/repeater.sh"])
+  yt_dlp_executable: Path.join([File.cwd!(), "/test/support/scripts/yt-dlp-mocks/repeater.sh"]),
+  media_directory: Path.join([System.tmp_dir!(), "yt-dlp"])
 
 # Configure your database
 #
diff --git a/lib/pinchflat/downloader/backends/yt_dlp/video.ex b/lib/pinchflat/downloader/backends/yt_dlp/video.ex
new file mode 100644
index 0000000..fe6895d
--- /dev/null
+++ b/lib/pinchflat/downloader/backends/yt_dlp/video.ex
@@ -0,0 +1,34 @@
+defmodule Pinchflat.Downloader.Backends.YtDlp.Video do
+  @moduledoc """
+  Contains utilities for working with singular videos
+  """
+
+  @doc """
+  Downloads a single video (and possible metadata) to the tmp directory.
+  Videos are downloaded in the following format:
+    `tmp/yt-dlp/<video_id>/<video_id>.<ext>`
+
+  The video will be moved to its final destination... elsewhere
+  # TODO: update these docs when I figure out a module to move videos
+  # NOTE: maybe instead of moving it to the tempdir, I can just download it
+          to the final destination by using the `output` option. The
+          parser could be updated to generate a value for the output option.
+          This way, advanced users can just the yt-dlp output syntax and
+          newer users can use the easier liquid-like syntax.
+  """
+  def download(url, command_opts \\ []) do
+    default_output_path = Path.join([base_directory(), "%(id)s", "%(id)s.%(ext)s"])
+    default_opts = [output: default_output_path]
+    opts = Keyword.merge(default_opts, command_opts)
+
+    backend_runner().run(url, opts)
+  end
+
+  defp base_directory do
+    Application.get_env(:pinchflat, :media_directory)
+  end
+
+  defp backend_runner do
+    Application.get_env(:pinchflat, :yt_dlp_runner)
+  end
+end