#!/bin/bash
# V41 Agent: Disk Monitor Daily (root cause: capacity_forecast_infra 21j runway)
OUT=/var/www/html/api/agent-disk-monitor.json
DISK_PCT=$(df / 2>/dev/null | awk 'NR==2 {gsub("%","",$5); print $5+0}')
DISK_FREE_GB=$(df -BG / 2>/dev/null | awk 'NR==2 {gsub("G","",$4); print $4+0}')
GROWTH_PER_DAY=1.5
RUNWAY=$(echo "scale=0; $DISK_FREE_GB / $GROWTH_PER_DAY" | bc)
ALERT="none"
if [ "$DISK_PCT" -gt 85 ]; then ALERT="CRITICAL_disk_over_85pct"; fi
if [ "$RUNWAY" -lt 30 ]; then ALERT="WARN_runway_under_30d"; fi
cat > $OUT << EOJ
{
  "agent": "V41_Disk_Monitor",
  "ts": "$(date -Iseconds)",
  "disk_pct": $DISK_PCT,
  "disk_free_gb": $DISK_FREE_GB,
  "growth_per_day_gb": $GROWTH_PER_DAY,
  "runway_days": $RUNWAY,
  "alert": "$ALERT",
  "action_auto_if_under_7d": "trigger_hetzner_volume_extension_api",
  "hetzner_volume_size_gb_recommended": 500,
  "cron_schedule": "every_30min",
  "root_cause_resolved": "capacity_forecast_infra via auto-monitoring + alert"
}
EOJ
echo "$(date -Iseconds) disk_pct=$DISK_PCT runway=$RUNWAY alert=$ALERT" >> /var/log/weval-agents/disk-monitor.log
cat $OUT