From 8afeb618d3b15bbce0aa63a0a284208dae38f651 Mon Sep 17 00:00:00 2001
From: Jakob Moser <moser@cl.uni-heidelberg.de>
Date: Sun, 22 Jun 2025 15:15:54 +0200
Subject: [PATCH] Add very basic Flask implementation

---
 karaokatalog/ui/serve/__main__.py      | 32 ++++++++++++++++++++++++++
 karaokatalog/ui/serve/get_flask_app.py | 16 +++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 karaokatalog/ui/serve/__main__.py
 create mode 100644 karaokatalog/ui/serve/get_flask_app.py

diff --git a/karaokatalog/ui/serve/__main__.py b/karaokatalog/ui/serve/__main__.py
new file mode 100644
index 0000000..5b4f8d4
--- /dev/null
+++ b/karaokatalog/ui/serve/__main__.py
@@ -0,0 +1,32 @@
+import json
+import logging
+
+from karaokatalog.get_parser import get_parser
+from karaokatalog.Library import Library
+from karaokatalog.ui.serve.get_flask_app import get_flask_app
+
+logging.basicConfig(
+    format="%(asctime)s [%(levelname)s] %(message)s", level=logging.INFO
+)
+
+
+if __name__ == "__main__":
+    args = get_parser(
+        "ui.serve", "Serve a web UI to browse the Karaokatalog"
+    ).parse_args()
+
+    songs_json_path = args.library_path / "songs.json"
+
+    if songs_json_path.exists():
+        logging.info(f"Loading {songs_json_path}")
+        with songs_json_path.open("r", encoding="utf-8") as f:
+            songs = json.load(f)
+    else:
+        logging.info("Loading library")
+        library = Library.from_dir(args.library_path)
+        logging.info("Library loaded")
+        songs = [song.as_dict() for song in library.songs]
+
+    logging.info("Starting UI")
+    app = get_flask_app(songs)
+    app.run(port=5657)
diff --git a/karaokatalog/ui/serve/get_flask_app.py b/karaokatalog/ui/serve/get_flask_app.py
new file mode 100644
index 0000000..c19569c
--- /dev/null
+++ b/karaokatalog/ui/serve/get_flask_app.py
@@ -0,0 +1,16 @@
+from collections.abc import Sequence
+
+from flask import Flask
+
+
+def get_flask_app(songs: Sequence[dict[str, str]]) -> Flask:
+    app = Flask("karaokatalog.ui", static_url_path="/")
+
+    # This is only to make the type checker happy.
+    songs_list = list(songs)
+
+    @app.get("/api/songs")
+    def get_songs() -> list[dict[str, str]]:
+        return songs_list
+
+    return app