#!/bin/bash

# === Your actual setup ===
HOST="38.102.127.168"       # Montreal's IP to probe
THRESHOLD_LATENCY=150       # in ms
THRESHOLD_LOSS=5            # in %
CF_ZONE_ID="c5099d42caa2d9763227267c597cb758"   # Replace with your real Cloudflare zone ID
CF_RECORD_ID="7001484a25f0fe5c323845b6695f7544" # Replace with your real DNS record ID
CF_API_TOKEN="lCz1kH6nBZPJL0EWrNI-xEDwfR0oOLpg05fq6M81" # Cloudflare API token
LINODE_IP="172.238.63.162"  # Linode IP
LOG_FILE="/var/log/tt_failover.log"
DATE=$(date '+%Y-%m-%d %H:%M:%S')

# === Run mtr probe ===
mtr -r -c 10 $HOST > /tmp/mtr_output.txt

# === Extract average latency and packet loss ===
# Average latency from ping (use 10 pings)
AVG_LATENCY=$(ping -c 10 $HOST | tail -1| awk '{print $4}' | cut -d '/' -f 2)

# Packet loss from ping (last line)
LOSS=$(ping -c 10 $HOST | grep -oP '\d+(?=% packet loss)')

echo "[$DATE] DEBUG: AVG_LATENCY=$AVG_LATENCY, LOSS=$LOSS" >> $LOG_FILE


# === Logging ===
echo "[$DATE] Latency: $AVG_LATENCY ms, Loss: $LOSS%" >> $LOG_FILE

# === Decision ===
if (( $(echo "$AVG_LATENCY > $THRESHOLD_LATENCY" | bc -l) )) || (( $(echo "$LOSS > $THRESHOLD_LOSS" | bc -l) )); then
  echo "[$DATE] 🔴 Montreal is glitchy! Flipping to Linode ($LINODE_IP)..." >> $LOG_FILE
  curl -X PUT "https://api.cloudflare.com/client/v4/zones/$CF_ZONE_ID/dns_records/$CF_RECORD_ID" \
    -H "Authorization: Bearer $CF_API_TOKEN" \
    -H "Content-Type: application/json" \
    --data '{"type":"A","name":"tt.themediahub.org","content":"'"$LINODE_IP"'","ttl":60,"proxied":false}' >> $LOG_FILE 2>&1
  echo "[$DATE] ✅ Failover to Linode triggered." >> $LOG_FILE
else
  echo "[$DATE] ✅ Montreal healthy. No action taken." >> $LOG_FILE
fi