#!/bin/bash

# Deep Space Analysis - Find where the 20GB actually went
# When deleted files don't free space even after restart

set -e

echo "=== Deep Space Analysis ==="
echo ""

# Container vs Volume space
echo "📊 Container vs Volume Space:"
echo "   Container Total: $(diskutil info / | grep 'Container Total' | awk '{print $4, $5}')"
echo "   Container Free:  $(diskutil info / | grep 'Container Free' | awk '{print $4, $5}')"
echo "   Volume Used:     $(diskutil info / | grep 'Volume Used Space' | awk '{print $4, $5, $6}')"
echo ""

# Calculate discrepancy
CONTAINER_TOTAL=$(diskutil info / | grep 'Container Total' | awk '{print $3}' | tr -d 'GB')
CONTAINER_FREE=$(diskutil info / | grep 'Container Free' | awk '{print $3}' | tr -d 'GB')
VOLUME_USED=$(diskutil info / | grep 'Volume Used Space' | awk '{print $4}' | tr -d 'GB')

CONTAINER_USED=$(echo "$CONTAINER_TOTAL - $CONTAINER_FREE" | bc)
DISCREPANCY=$(echo "$CONTAINER_USED - $VOLUME_USED" | bc)

echo "   Container Used: ~${CONTAINER_USED}GB"
echo "   Volume Used: ~${VOLUME_USED}GB"
if (( $(echo "$DISCREPANCY > 5" | bc -l) )); then
    echo "   ⚠️  Discrepancy: ~${DISCREPANCY}GB unaccounted for!"
    echo "      This space may be in:"
    echo "      - Other APFS volumes"
    echo "      - APFS snapshots"
    echo "      - Reserved space"
    echo "      - System files"
fi
echo ""

# Check all APFS volumes
echo "📦 APFS Volumes:"
diskutil apfs list 2>/dev/null | grep -E "Volume Name|Used Space|Free Space" | head -20 | sed 's/^/   /'
echo ""

# Check snapshots
echo "📸 APFS Snapshots:"
SNAP_COUNT=$(diskutil apfs listSnapshots / 2>/dev/null | grep -c "Name:" || echo "0")
echo "   Found $SNAP_COUNT snapshot(s)"
if [ "$SNAP_COUNT" -gt 0 ]; then
    diskutil apfs listSnapshots / 2>/dev/null | grep -E "Name|Purgeable" | head -6 | sed 's/^/     /'
fi
echo ""

# Check for large directories that might have been missed
echo "🔍 Large Directories Check:"
echo "   Home directory: $(du -sh ~ 2>/dev/null | awk '{print $1}')"
echo "   Documents: $(du -sh ~/Documents 2>/dev/null | awk '{print $1}')"
echo "   Library: $(du -sh ~/Library 2>/dev/null | awk '{print $1}')"
echo "   Downloads: $(du -sh ~/Downloads 2>/dev/null | awk '{print $1}')"
echo "   Movies: $(du -sh ~/Movies 2>/dev/null | awk '{print $1}')"
echo ""

# Check if files were actually deleted
echo "❓ Verification:"
echo "   You mentioned deleting 20GB from Movies/Videos folder"
echo "   Current Movies folder: $(du -sh ~/Movies 2>/dev/null | awk '{print $1}')"
echo ""
echo "   Questions:"
echo "   1. Did you delete from ~/Movies or another location?"
echo "   2. Did you empty Trash after deleting?"
echo "   3. Are the files still in Trash?"
echo ""

# Check trash
TRASH_SIZE=$(du -sh ~/.Trash 2>/dev/null | awk '{print $1}' || echo "0")
echo "   Trash size: $TRASH_SIZE"
echo ""

# Summary
echo "=== Analysis ==="
echo ""
if (( $(echo "$DISCREPANCY > 15" | bc -l) )); then
    echo "⚠️  Found ${DISCREPANCY}GB+ unaccounted space in container!"
    echo ""
    echo "   This suggests:"
    echo "   1. Files may not have been actually deleted"
    echo "   2. Space is in another APFS volume"
    echo "   3. APFS snapshots are holding space"
    echo "   4. System reserved space"
    echo ""
    echo "   Next steps:"
    echo "   1. Verify files were actually deleted (not just moved to Trash)"
    echo "   2. Empty Trash: rm -rf ~/.Trash/*"
    echo "   3. Check other volumes: diskutil apfs list"
    echo "   4. Check for large files: find ~ -size +1G -type f 2>/dev/null"
    echo ""
else
    echo "   Space accounting looks normal."
    echo "   The 20GB may have been:"
    echo "   - Used by other files growing"
    echo "   - Actually still present (not deleted)"
    echo "   - In Trash (not emptied)"
    echo ""
fi

echo ""