#!/bin/sh

MOUNT="/downloads"
OUTPUT="/html/disk.json"

update_disk() {
    LINE=$(df -h "$MOUNT" 2>/dev/null | awk 'NR==2')
    if [ -z "$LINE" ]; then
        echo "ERROR: df failed for $MOUNT" >&2
        return 1
    fi

    TOTAL=$(echo "$LINE" | awk '{print $2}')
    USED=$(echo "$LINE" | awk '{print $3}')
    AVAILABLE=$(echo "$LINE" | awk '{print $4}')
    USE_PERCENT=$(echo "$LINE" | awk '{print $5}')

    cat > "$OUTPUT" <<JSON
{
  "total": "$TOTAL",
  "used": "$USED",
  "available": "$AVAILABLE",
  "use_percent": "$USE_PERCENT",
  "updated_at": "$(date -u +%Y-%m-%dT%H:%M:%SZ)"
}
JSON

    echo "disk.json updated: $USE_PERCENT used ($USED / $TOTAL)"
}

while true; do
    update_disk || true
    sleep 30
done