#!/usr/bin/env bash

set -euo pipefail

HEALTH_URL="${HEALTH_URL:-https://teams-ghayama-dc56d4853672.hosted.ghaymah.systems/health}"
INTERVAL="${INTERVAL:-30}"
LOG_FILE="${LOG_FILE:-monitor.log}"

RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[0;33m'
NC='\033[0m'

timestamp() {
  date '+%Y-%m-%d %H:%M:%S'
}

check_health() {
  local ts
  ts="$(timestamp)"

  local response
  local http_code
  local response_time

  response=$(curl -s -o /dev/null -w '%{http_code}|%{time_total}' \
    --connect-timeout 5 \
    --max-time 10 \
    "$HEALTH_URL" 2>&1) || true

  if [[ $? -ne 0 ]] || [[ -z "$response" ]]; then
    printf "[%s]\n" "$ts"
    printf "${RED}Status: DOWN${NC}\n"
    printf "Error: Connection refused or timeout\n\n"
    printf "[%s] DOWN - Connection refused or timeout\n" "$ts" >> "$LOG_FILE"
    return
  fi

  http_code=$(echo "$response" | cut -d'|' -f1)
  response_time=$(echo "$response" | cut -d'|' -f2)

  local response_ms
  response_ms=$(awk "BEGIN {printf \"%.0f\", $response_time * 1000}")

  if [[ "$http_code" -eq 200 ]]; then
    printf "[%s]\n" "$ts"
    printf "${GREEN}Status: UP${NC}\n"
    printf "HTTP: %s\n" "$http_code"
    printf "Response Time: %s ms\n\n" "$response_ms"
    printf "[%s] UP - HTTP %s - %s ms\n" "$ts" "$http_code" "$response_ms" >> "$LOG_FILE"
  else
    printf "[%s]\n" "$ts"
    printf "${RED}Status: DOWN${NC}\n"
    printf "HTTP: %s\n" "$http_code"
    printf "Response Time: %s ms\n\n" "$response_ms"
    printf "[%s] DOWN - HTTP %s - %s ms\n" "$ts" "$http_code" "$response_ms" >> "$LOG_FILE"
  fi
}

cleanup() {
  printf "\n${YELLOW}Monitoring stopped.${NC}\n"
  exit 0
}

trap cleanup SIGINT SIGTERM

printf "${GREEN}Ghaymah Health Monitor${NC}\n"
printf "URL:     %s\n" "$HEALTH_URL"
printf "Interval: %ss\n" "$INTERVAL"
printf "Log:     %s\n\n" "$LOG_FILE"

while true; do
  check_health
  sleep "$INTERVAL"
done