#!/usr/bin/env bash
###############################################################################
# Uptime Kuma push script using JSON inventory + jq
###############################################################################
set -Eeuo pipefail

CFG="/opt/kuma-checks.json"
BASE="https://status.jordanwages.com/api/push"
CURL_OPTS=(--silent --show-error --max-time 4)

# 0-4 s start-up jitter so many VMs don’t hit Kuma simultaneously
sleep $(( RANDOM % 5 ))

# --------------------------------------------------------------------------- #
push() {          # $1 token  $2 status  $3 msg  $4 ping-ms
  curl "${CURL_OPTS[@]}" \
       "${BASE}/${1}?status=${2}&msg=${3// /%20}&ping=${4}" \
       || true             # don’t abort script if push itself fails
}

check_http() {    # arg: URL
  local t0=$(date +%s%3N)
  local code
  code=$(curl "${CURL_OPTS[@]}" -o /dev/null -w '%{http_code}' "$1" || echo 000)
  echo "$([[ $code =~ ^2|3 ]] && echo up || echo down) $(( $(date +%s%3N) - t0 ))"
}
check_service() { systemctl is-active --quiet "$1" && echo "up 0" || echo "down 0"; }
check_docker()  { docker inspect -f '{{.State.Running}}' "$1" &>/dev/null && echo "up 0" || echo "down 0"; }
check_mount()   { mountpoint -q "$1" 2>/dev/null && echo "up 0" || echo "down 0"; }
check_native()  { echo "up 0"; }

# --------------------------------------------------------------------------- #
# Loop over checks defined in the JSON inventory
jq -c '.[]' "$CFG" | while IFS= read -r item; do
  name=$(jq -r '.name'   <<<"$item")
  type=$(jq -r '.type'   <<<"$item")
  id=$(jq   -r '.push'   <<<"$item")
  tgt=$(jq  -r '.target // empty' <<<"$item")   # may be absent for "native"

  case "$type" in
    http)    read -r stat ping < <(check_http    "$tgt") ;;
    service) read -r stat ping < <(check_service "$tgt") ;;
    docker)  read -r stat ping < <(check_docker  "$tgt") ;;
    mount)   read -r stat ping < <(check_mount   "$tgt") ;;
    native)  read -r stat ping < <(check_native)         ;;
    *)       stat=down; ping=0 ;;
  esac

  push "$id" "$stat" "$name" "$ping"
done