nixos/services/bazarr-sync.nix

# services/bazarr-sync.nix — Subtitle sync via bazarr-sync.
#
# Two systemd timers:
#   bazarr-sync         — hourly, targets only movies/shows added in the last
#                         2 hours (queries Radarr/Sonarr APIs for recent items)
#   bazarr-sync-full    — weekly full-library sync (every Sunday 04:00)
#
# Both use the same bazarr-sync container image under podman with --network host
# so it can reach Bazarr on localhost:6767.
{ config, lib, pkgs, ... }:
let
  deps = lib.makeBinPath [ pkgs.curl pkgs.jq pkgs.gnused pkgs.gnugrep pkgs.coreutils pkgs.podman pkgs.yq-go ];

  # Shared preamble: extract API keys and write config.yaml
  preamble = ''
    set -euo pipefail
    PATH="${deps}:$PATH"

    BASE="http://127.0.0.1"
    CONFIG_DIR="/var/lib/bazarr-sync"
    CONFIG_FILE="$CONFIG_DIR/config.yaml"

    # --- Extract API keys (same pattern as arr-interconnect) ---
    extract_arr_key() {
      if [ -f "$1" ]; then
        sed -n 's/.*<ApiKey>\(.*\)<\/ApiKey>.*/\1/p' "$1"
      fi
    }

    SONARR_KEY=$(extract_arr_key "/var/lib/sonarr/config.xml")
    RADARR_KEY=$(extract_arr_key "/var/lib/radarr/config.xml")

    BAZARR_KEY=""
    if [ -f "/var/lib/bazarr/config/config.yaml" ]; then
      BAZARR_KEY=$(yq '.auth.apikey' /var/lib/bazarr/config/config.yaml || true)
    fi

    if [ -z "$BAZARR_KEY" ]; then
      echo "ERROR: Could not extract Bazarr API key"
      exit 1
    fi

    # --- Write config.yaml for bazarr-sync ---
    cat > "$CONFIG_FILE" <<EOF
    address: "127.0.0.1"
    port: 6767
    protocol: "http"
    apitoken: "$BAZARR_KEY"
    EOF

    IMAGE="ghcr.io/ajmandourah/bazarr-sync:latest"
    run_sync() {
      podman run --rm --network host \
        -v "$CONFIG_FILE":/usr/src/app/config.yaml:ro \
        "$IMAGE" bazarr-sync sync "$@"
    }
  '';

  # Hourly: only sync recently added content
  recentScript = pkgs.writeShellScript "bazarr-sync-recent" ''
    ${preamble}

    LOOKBACK_HOURS=2
    CUTOFF=$(date -u -d "-$LOOKBACK_HOURS hours" +%Y-%m-%dT%H:%M:%SZ)

    # --- Query Radarr for recently added movies ---
    RADARR_IDS=""
    if [ -n "$RADARR_KEY" ]; then
      echo "Querying Radarr for movies added since $CUTOFF..."
      RADARR_IDS=$(curl -sf -H "X-Api-Key: $RADARR_KEY" \
        "$BASE:7878/api/v3/movie" | \
        jq -r --arg cutoff "$CUTOFF" \
        '[.[] | select(.added >= $cutoff) | .id] | map(tostring) | join(",")') || true
      if [ -n "$RADARR_IDS" ]; then
        echo "  Found recently added movies: $RADARR_IDS"
      else
        echo "  No recently added movies"
      fi
    fi

    # --- Query Sonarr for series with recently imported episodes ---
    SONARR_IDS=""
    if [ -n "$SONARR_KEY" ]; then
      echo "Querying Sonarr for recently imported episodes since $CUTOFF..."
      SONARR_IDS=$(curl -sf -H "X-Api-Key: $SONARR_KEY" \
        "$BASE:8989/api/v3/history?pageSize=200&sortKey=date&sortDirection=descending" | \
        jq -r --arg cutoff "$CUTOFF" \
        '[.records[] | select(.date >= $cutoff and .eventType == "downloadFolderImported") | .seriesId] | unique | map(tostring) | join(",")') || true
      if [ -n "$SONARR_IDS" ]; then
        echo "  Found series with recent imports: $SONARR_IDS"
      else
        echo "  No recently imported episodes"
      fi
    fi

    # --- Exit early if nothing to do ---
    if [ -z "$RADARR_IDS" ] && [ -z "$SONARR_IDS" ]; then
      echo "Nothing new to sync. Exiting."
      exit 0
    fi

    # --- Run bazarr-sync for recent movies ---
    if [ -n "$RADARR_IDS" ]; then
      echo "Syncing subtitles for movies: $RADARR_IDS"
      run_sync movies --radarr-id "$RADARR_IDS" || echo "WARNING: Movie sync failed"
    fi

    # --- Run bazarr-sync for recent shows ---
    if [ -n "$SONARR_IDS" ]; then
      echo "Syncing subtitles for shows: $SONARR_IDS"
      run_sync shows --sonarr-id "$SONARR_IDS" || echo "WARNING: Show sync failed"
    fi

    echo "Sync complete."
  '';

  # Weekly: full library sync
  fullScript = pkgs.writeShellScript "bazarr-sync-full" ''
    ${preamble}

    echo "Starting full library subtitle sync..."

    echo "Syncing all movies..."
    run_sync movies || echo "WARNING: Full movie sync failed"

    echo "Syncing all shows..."
    run_sync shows || echo "WARNING: Full show sync failed"

    echo "Full sync complete."
  '';

  serviceAfter = [ "bazarr.service" "sonarr.service" "radarr.service" "network-online.target" ];
in
{
  config = lib.mkIf (config.networking.hostName == "FredOS-Mediaserver") {

    # Ensure podman is available with a valid container policy
    virtualisation.podman.enable = true;

    # Persistent directory for the generated config.yaml
    systemd.tmpfiles.rules = [
      "d /var/lib/bazarr-sync 0700 root root -"
    ];

    # --- Hourly: recent additions only ---
    systemd.services.bazarr-sync = {
      description = "Sync subtitles for recently added media via bazarr-sync";
      after = serviceAfter;
      wants = [ "network-online.target" ];
      serviceConfig = {
        Type = "oneshot";
        ExecStart = recentScript;
      };
    };

    systemd.timers.bazarr-sync = {
      description = "Run bazarr-sync hourly for recent additions";
      wantedBy = [ "timers.target" ];
      timerConfig = {
        OnCalendar = "hourly";
        RandomizedDelaySec = "5m";
        Persistent = true;
      };
    };

    # --- Weekly: full library sync ---
    systemd.services.bazarr-sync-full = {
      description = "Full library subtitle sync via bazarr-sync";
      after = serviceAfter;
      wants = [ "network-online.target" ];
      serviceConfig = {
        Type = "oneshot";
        ExecStart = fullScript;
      };
    };

    systemd.timers.bazarr-sync-full = {
      description = "Run full bazarr-sync weekly (Sunday 04:00)";
      wantedBy = [ "timers.target" ];
      timerConfig = {
        OnCalendar = "Sun *-*-* 04:00:00";
        RandomizedDelaySec = "15m";
        Persistent = true;
      };
    };
  };
}