From c3b045090dcfcb6cdf1943c39bfd7c79f245a4d0 Mon Sep 17 00:00:00 2001
From: Alexander Heldt <me@alexanderheldt.se>
Date: Fri, 14 Nov 2025 22:51:36 +0100
Subject: [PATCH] wip

---
 src/mpv/key.gleam     |  7 ++++
 src/mpv/mpv.gleam     | 77 ++++++++++++++++++++++++++++++++++++++++---
 src/musicplayer.gleam | 16 ++++-----
 3 files changed, 87 insertions(+), 13 deletions(-)
 create mode 100644 src/mpv/key.gleam

diff --git a/src/mpv/key.gleam b/src/mpv/key.gleam
new file mode 100644
index 0000000..01f8d90
--- /dev/null
+++ b/src/mpv/key.gleam
@@ -0,0 +1,7 @@
+pub type Key {
+  Char(String)
+}
+
+pub fn from_string(s: String) -> Key {
+  Char(s)
+}
diff --git a/src/mpv/mpv.gleam b/src/mpv/mpv.gleam
index c5c9f8a..9759ad7 100644
--- a/src/mpv/mpv.gleam
+++ b/src/mpv/mpv.gleam
@@ -1,16 +1,83 @@
-import tcp/reason
+import gleam/erlang/process.{type Subject}
+import gleam/io
+import gleam/otp/actor
+
+import gleam/string
+import mpv/key.{type Key}
+import tcp/reason.{type Reason}
 import tcp/tcp.{type Socket}
 
-pub fn new() -> Result(Socket, String) {
+pub type Message {
+  Tick
+  KeyPress(Key)
+  Shutdown
+}
+
+type State(socket, exit) {
+  State(socket: Socket, exit: Subject(Nil))
+}
+
+pub fn new(exit: Subject(Nil)) -> Result(Subject(Message), String) {
   // TODO start up mvp here, currently hi-jacking `naviterm`s socket
   let socket_path = "/tmp/naviterm_mpv"
 
   case tcp.connect(socket_path) {
-    Error(r) -> Error("mpv - could not connect: " <> reason.to_string(r))
-    Ok(socket) -> Ok(socket)
+    Error(r) -> Error("Could not connect to mpv: " <> reason.to_string(r))
+    Ok(socket) -> {
+      case
+        actor.new(State(socket, exit))
+        |> actor.on_message(handle_message)
+        |> actor.start
+      {
+        Error(start_error) ->
+          Error("Could not start actor: " <> string.inspect(start_error))
+        Ok(actor.Started(data:, ..)) -> {
+          process.spawn(fn() { tick(data) })
+          process.spawn(fn() { read_input(data) })
+          Ok(data)
+        }
+      }
+    }
   }
 }
 
-pub fn toggle_play_pause(socket: Socket) {
+pub fn shutdown(subject: Subject(Message)) -> Nil {
+  actor.send(subject, Shutdown)
+}
+
+pub fn toggle_play_pause(socket: Socket) -> Result(Nil, Reason) {
   tcp.send(socket, "{\"command\":[\"cycle\",\"pause\"]}\n")
 }
+
+fn handle_message(
+  state: State(socket, exit),
+  message: Message,
+) -> actor.Next(State(socket, exit), Message) {
+  case message {
+    Tick -> actor.continue(state)
+    KeyPress(key) -> {
+      io.println("key: " <> string.inspect(key))
+      actor.continue(state)
+    }
+    Shutdown -> actor.continue(state)
+  }
+}
+
+fn tick(subject: Subject(Message)) -> Nil {
+  process.send(subject, Tick)
+  process.sleep(1000)
+  tick(subject)
+}
+
+fn read_input(subject: Subject(Message)) -> Nil {
+  io.println("reading input")
+  let key = io_get_line("") |> key.from_string
+  io.println("got key: " <> string.inspect(key))
+
+  key |> KeyPress |> process.send(subject, _)
+  read_input(subject)
+}
+
+// https://www.erlang.org/doc/apps/stdlib/io.html#get_line/1
+@external(erlang, "io", "get_line")
+fn io_get_line(prompt: String) -> String
diff --git a/src/musicplayer.gleam b/src/musicplayer.gleam
index 003672b..e900606 100644
--- a/src/musicplayer.gleam
+++ b/src/musicplayer.gleam
@@ -1,14 +1,14 @@
+import gleam/erlang/process
 import gleam/io
 import mpv/mpv
 
 pub fn main() -> Nil {
-  case mpv.new() {
-    Error(err) -> io.println("Could not create new mpv connection: " <> err)
-    Ok(socket) -> handle_key_events(socket)
+  let exit = process.new_subject()
+  case mpv.new(exit) {
+    Error(err) -> io.println("Could not start mpv: " <> err)
+    Ok(_) -> {
+      io.println("Started mpv")
+    }
   }
-}
-
-fn handle_key_events(socket) -> Nil {
-  let _ = mpv.toggle_play_pause(socket)
-  Nil
+  exit |> process.receive_forever
 }