# Media writes are allowed only after the pool and all its branches mount.
# Keep these directory rules out of global tmpfiles: nofail mounts may be
# absent when global tmpfiles runs, and creating paths then fills the root disk.
{ config, pkgs, lib, utils, ... }:
let
  pool = "/mnt/storage";
  branches = config.fileSystems.${pool}.depends or [ ];
  mounts = map (p: "${utils.escapeSystemdPath p}.mount") ([ pool ] ++ branches);
  consumers = [
    "jellyfin" "sonarr" "radarr" "bazarr" "qbittorrent-nox" "sabnzbd"
    "docker-shelfarr" "arr-interconnect" "bazarr-sync" "bazarr-sync-full"
  ];
  directories = pkgs.writeText "media-directories.conf" ''
    d /mnt/storage/torrents/downloads 2775 qbittorrent media -
    Z /mnt/storage/torrents/downloads 2775 qbittorrent media -
    d /mnt/storage/torrents/shows 2775 sonarr media -
    Z /mnt/storage/torrents/shows 2775 sonarr media -
    d /mnt/storage/torrents/movies 2775 radarr media -
    Z /mnt/storage/torrents/movies 2775 radarr media -
    d /mnt/storage/torrents/audiobooks 2775 fred media -
    Z /mnt/storage/torrents/audiobooks 2775 fred media -
    d /mnt/storage/usenet/downloads 2775 sabnzbd media -
    Z /mnt/storage/usenet/downloads 2775 sabnzbd media -
    d /mnt/storage/usenet/incomplete 2775 sabnzbd media -
    Z /mnt/storage/usenet/incomplete 2775 sabnzbd media -
  '';
in
{
  config = lib.mkIf (config.networking.hostName == "FredOS-Mediaserver") {
    systemd.services = {
      media-storage-ready = {
        description = "Prepare media directories on the mounted pool";
        requires = mounts;
        bindsTo = mounts;
        after = mounts;
        serviceConfig = {
          Type = "oneshot";
          RemainAfterExit = true;
        };
        script = ''
          set -euo pipefail
          ${lib.concatMapStringsSep "\n" (p: ''
            ${pkgs.util-linux}/bin/mountpoint -q ${lib.escapeShellArg p} || {
              echo "Required media mount missing: ${p}" >&2
              exit 1
            }
          '') ([ pool ] ++ branches)}
          ${pkgs.systemd}/bin/systemd-tmpfiles --create ${directories}
        '';
      };
    } // lib.genAttrs consumers (_: {
      requires = [ "media-storage-ready.service" ];
      after = [ "media-storage-ready.service" ];
      bindsTo = [ "media-storage-ready.service" ];
    });
  };
}