#!/bin/bash

# Check Real Disk Space - Verify what's actually using space
# Sometimes the snapshot is a ghost but space is actually available

set -e

echo "=== Real Disk Space Analysis ==="
echo ""

# Multiple methods to check space
echo "Method 1: df command:"
df -h / | tail -1
echo ""

echo "Method 2: diskutil info:"
diskutil info / | grep -E "Volume (Free|Used|Total) Space" | sed 's/^/   /'
echo ""

# Check if snapshot actually exists
echo "Method 3: APFS Snapshot Check:"
APFS_TM_SNAPS=$(diskutil apfs listSnapshots / 2>/dev/null | grep -i "timemachine" || echo "None")
if [ "$APFS_TM_SNAPS" = "None" ]; then
    echo "   ✅ No Time Machine snapshot in APFS (ghost entry only)"
else
    echo "   ⚠️  Found: $APFS_TM_SNAPS"
fi
echo ""

# Check Time Machine status
echo "Method 4: Time Machine Status:"
TM_RUNNING=$(tmutil status 2>/dev/null | grep "Running" | awk '{print $3}' | tr -d ';')
if [ "$TM_RUNNING" = "1" ]; then
    echo "   ⚠️  Time Machine is running (may be creating new snapshots)"
else
    echo "   ✅ Time Machine is not running"
fi
echo ""

# Calculate actual space
FREE_KB=$(df / | tail -1 | awk '{print $4}')
FREE_GB=$(echo "scale=2; $FREE_KB / 1024 / 1024" | bc)

echo "=== Summary ==="
echo "   Current free space: ${FREE_GB}GB"
echo ""

if (( $(echo "$FREE_GB < 5" | bc -l) )); then
    echo "⚠️  Still low on space. The ghost snapshot entry is not the issue."
    echo ""
    echo "The real issue: Your disk is actually full (or nearly full)."
    echo ""
    echo "The 20GB from deleted files may have been:"
    echo "  1. Used by Time Machine creating a new snapshot"
    echo "  2. Used by other processes/files"
    echo "  3. Actually freed but macOS hasn't updated the count yet"
    echo ""
    echo "Solutions:"
    echo ""
    echo "1. **Restart your Mac** - This will:"
    echo "   - Release any held snapshots"
    echo "   - Update disk space accounting"
    echo "   - Clear stuck processes"
    echo ""
    echo "2. Check what's really using space:"
    echo "   du -h -d 1 ~ | sort -hr | head -20"
    echo ""
    echo "3. Clean up large files:"
    echo "   - Downloads folder: $(du -sh ~/Downloads 2>/dev/null | awk '{print $1}')"
    echo "   - Library/Caches: $(du -sh ~/Library/Caches 2>/dev/null | awk '{print $1}')"
    echo ""
    echo "4. The ghost snapshot entry is harmless - ignore it."
    echo "   It will clear when Time Machine successfully backs up."
else
    echo "✅ You have ${FREE_GB}GB free - this should be enough!"
    echo ""
    echo "The ghost snapshot entry can be ignored - it's not using space."
fi

echo ""