#!/bin/bash
# ==============================================================================================
# ================================= Lidarr Cache Prefill ========================================
# ==============================================================================================
#
# PURPOSE
# ─────────────────────────────────────────────────────────────────────────────
# Populates the shared Lidarr tracked-data cache (see lidarr_get_tracked_data() in common.sh)
# once at array start, before any other script needs it. Without this, the cache stays cold
# from boot until whichever Lidarr-touching script happens to run first and write through —
# which could be hours, depending on the daily schedule. One-shot: runs and exits.
#
# ==============================================================================================
# OPERATIONAL MODEL
# ==============================================================================================
#
# Lidarr's container may still be starting when this fires (array just started) — retries
# reaching the API for up to LIDARR_PREFILL_WAIT_MINUTES before giving up. Not fatal if it
# never comes up in time; the cache just stays cold until the next script writes through
# naturally, exactly as it would without this script existing at all.
#
# ==============================================================================================
# CONFIGURATION
# ==============================================================================================
#
# host*.conf
#   HOST1_LIDARR_URL / HOST1_LIDARR_API_KEY — aliased by detect_hosts()
#
# master.conf
#   LIDARR_PREFILL_WAIT_MINUTES — how long to retry reaching Lidarr before giving up (default 10)
#
# ==============================================================================================

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

source "$SCRIPT_DIR/../load_config.sh"

parse_args "$@"

if [[ "$EUID" -ne 0 ]]; then
    error "Must be run as root"
    exit 1
fi

if ! command -v jq >/dev/null 2>&1; then
    warn "jq not found — skipping Lidarr cache prefill"
    exit 0
fi

acquire_lock

detect_hosts

if [[ -z "${LIDARR_URL:-}" ]] || [[ -z "${LIDARR_API_KEY:-}" ]]; then
    info "Lidarr not configured on $MY_ID ($LOCAL_SERVER_NAME) — nothing to prefill"
    exit 0
fi

WAIT_MINUTES="${LIDARR_PREFILL_WAIT_MINUTES:-10}"
WAITED=0
until check_api "$LIDARR_URL" "Lidarr" 5 >/dev/null 2>&1; do
    if [[ "$WAITED" -ge $(( WAIT_MINUTES * 60 )) ]]; then
        warn "Lidarr not reachable after ${WAIT_MINUTES}m — leaving cache cold, next script will write through"
        exit 0
    fi
    sleep 15
    (( WAITED += 15 ))
done

ARTISTS=$(arr_api "$LIDARR_URL" "$LIDARR_API_KEY" "v1" "artist" "Lidarr") || {
    warn "Could not fetch artists for cache prefill — leaving cache cold"
    exit 0
}

if lidarr_cache_write "$ARTISTS"; then
    log "$ICON_DONE Lidarr cache prefilled ($(echo "$ARTISTS" | jq 'length') artists)"
else
    warn "Failed to write Lidarr cache prefill"
fi

exit 0