{ config, pkgs, inputs, lib, hostname, username, ... }:

let
  mpv-service-script = pkgs.writeShellScriptBin "mpv-service" ''
    #!/bin/sh -eu

    SOCKET_PATH="/tmp/mpv-${username}.sock"

    rm -f "''${SOCKET_PATH}"

    cleanup() {
        echo "Stopping MPV service..."
        rm -f "''${SOCKET_PATH}"
        pkill -P $$ mpv || true
    }
    trap cleanup EXIT TERM INT

    exec ${pkgs.mpv}/bin/mpv \
        --really-quiet \
        --idle \
        --no-video --force-window=no \
        --input-ipc-server="''${SOCKET_PATH}" \
        --demuxer-max-bytes=50MiB \
        --demuxer-max-back-bytes=10MiB \
        --audio-buffer=0.5
  '';
in {
  systemd.user.services.mpv = {
    enable = true;
    description = "MPV Audio Player Service with IPC";
    documentation = [ "man:mpv(1)" ];

    wantedBy = [ "default.target" ];
    after = [ "sound.target" ];
    wants = [ "sound.target" ];

    serviceConfig = {
      Type = "simple";
      ExecStart = "${mpv-service-script}/bin/mpv-service";
      Restart = "on-failure";
      RestartSec = "5";

      Environment = [
        "DBUS_SESSION_BUS_ADDRESS=unix:path=%t/bus"
        "XDG_RUNTIME_DIR=%t"
      ];

      StandardOutput = "journal";
      StandardError = "journal";

      PrivateTmp = false;
      ProtectSystem = "strict";
      ProtectHome = "read-only";
      NoNewPrivileges = true;
    };

    environment = {
      MPV_SOCKET = "/tmp/mpv-${username}.sock";
    };
  };
}