#!/usr/bin/env bash
set -u

#######################################
# Sites à vérifier
#######################################
SITES=(
  "ferme.malio-dev.fr"
  "sirh.malio-dev.fr"
  "inventory.malio-dev.fr"
)

SCHEME="http"
CONNECT_TIMEOUT=3
MAX_TIME=8

#######################################
# Logs
#######################################
LOG_DIR="/var/log/app_health"
mkdir -p "$LOG_DIR"
LOG_FILE="${LOG_DIR}/app_health_$(date +'%Y-%m-%d').log"

#######################################
# Discord
#######################################
DISCORD_WEBHOOK_URL="https://discord.com/api/webhooks/1478379245842600007/tSxi3G6PbCn89pOdeqK34LR7c-GhXfT-lSCPolwBywJXcpa3ihL8rN4QRwsTjF6SS3w0"

discord_ping() {
  local site="$1"
  local status="$2"
  local detail="$3"

  [[ -z "${DISCORD_WEBHOOK_URL:-}" ]] && return 0

  local color icon

  if [[ "$status" == "OK" ]]; then
    color="🟢"
    icon="✅"
  else
    color="🔴"
    icon="❌"
  fi

  local msg="**CHECK APP RECETTE $color**\n"
  msg+="Application: ${site}\n"
  msg+="Status: ${icon}\n"
  msg+="Details: ${detail}"

  curl -fsS -H "Content-Type: application/json" \
    -d "{\"content\":\"$msg\"}" \
    "$DISCORD_WEBHOOK_URL" >/dev/null || true
}

#######################################
# Logging
#######################################
log_line() {
  # 2026-03-04 14:12:33 | LEVEL | site | message
  printf "%s | %s | %s | %s\n" \
    "$(date +'%Y-%m-%d %H:%M:%S')" "$1" "$2" "$3" | tee -a "$LOG_FILE"

  # Envoi Discord par application
  discord_ping "$2" "$1" "$3"
}

#######################################
# DNS
#######################################
dns_ok() {
  getent hosts "$1" >/dev/null 2>&1
}

#######################################
# Check application
#######################################
check_site() {

  local host="$1"
  local url="${SCHEME}://${host}/"

  if ! dns_ok "$host"; then
    log_line "DOWN" "$host" "Résolution impossible (getent hosts)"
    return 1
  fi

  local http_code curl_exit stderr

  stderr="$(mktemp)"

  http_code="$(
    curl -sS -o /dev/null \
      -w '%{http_code}' \
      --connect-timeout "$CONNECT_TIMEOUT" \
      --max-time "$MAX_TIME" \
      "$url" 2>"$stderr"
  )"

  curl_exit=$?

  if [ $curl_exit -ne 0 ]; then
    local err
    err="$(head -n 1 "$stderr" | tr -d '\r')"
    rm -f "$stderr"

    log_line "DOWN" "$host" "curl exit=$curl_exit : ${err:-"(aucun)"}"
    return 1
  fi

  rm -f "$stderr"

  if [[ "$http_code" =~ ^[0-9]{3}$ ]]; then
    if [ "$http_code" -ge 200 ] && [ "$http_code" -le 399 ]; then
      log_line "OK" "$host" "HTTP $http_code"
      return 0
    fi

    log_line "DOWN" "$host" "HTTP $http_code (erreur appli)"
    return 1
  fi

  log_line "DOWN" "$host" "Code HTTP inattendu: $http_code"
  return 1
}

#######################################
# Main
#######################################
main() {

  local failures=0

  for site in "${SITES[@]}"; do
    if ! check_site "$site"; then
      failures=$((failures + 1))
    fi
  done

  if [ "$failures" -gt 0 ]; then
    exit 2
  fi

  exit 0
}

main "$@"