#!/usr/bin/env bash
###############################################################################
# Uptime Kuma push script - Bash + jq + wget (no curl)
###############################################################################
set -Eeuo pipefail

CFG="/opt/kuma-checks.json"
BASE="https://status.jordanwages.com/api/push"
WGET_OPTS=(--quiet --tries=1 --timeout=4 --output-document=/dev/null)

# 0-4 s jitter so many VMs don't hit Kuma at the exact same second
sleep $(( RANDOM % 5 ))

# --------------------------------------------------------------------------- #
push() {          # $1 token  $2 status  $3 msg  $4 ping-ms
  local url="${BASE}/${1}?status=${2}&msg=${3// /%20}&ping=${4}"
  wget "${WGET_OPTS[@]}" "$url" || true          # Kuma will alert if pushes stop
}

check_http() {    # arg: URL
  local start elapsed
  start=$(date +%s%3N)
  if wget "${WGET_OPTS[@]}" "$1"; then
      elapsed=$(( $(date +%s%3N) - start ))
      echo "up $elapsed"
  else
      elapsed=$(( $(date +%s%3N) - start ))
      echo "down $elapsed"
  fi
}

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"; }

# --------------------------------------------------------------------------- #
# Iterate through 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")   # target may be absent

  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