#!/bin/bash

# Final Explanation - Why Nothing Works

set -e

echo "=== FINAL EXPLANATION ==="
echo ""
echo "You've tried everything:"
echo "  ✅ Moved files to NAS"
echo "  ✅ Moved files to external drive"
echo "  ✅ Cleaned caches"
echo "  ❌ Still no space freed"
echo ""

FREE_SPACE=$(df / | tail -1 | awk '{print $4}')
FREE_SPACE_GB=$(echo "scale=2; $FREE_SPACE / 1024 / 1024" | bc)
echo "Current free space: ${FREE_SPACE_GB}GB"
echo ""

echo "❌ WHY NOTHING WORKS:"
echo ""
echo "The OS update snapshot preserves EVERYTHING:"
echo "  - Deleted files → Preserved in snapshot"
echo "  - Moved files → Preserved in snapshot"
echo "  - Files on NAS → Still preserved in snapshot"
echo "  - Files on external drive → Still preserved in snapshot"
echo ""
echo "The snapshot doesn't care WHERE files went."
echo "It preserves them regardless of destination."
echo ""

echo "📸 The Snapshot:"
SNAPSHOT=$(diskutil apfs listSnapshots / 2>/dev/null | grep "Name:" | head -1)
if [ -n "$SNAPSHOT" ]; then
    echo "$SNAPSHOT" | sed 's/^/   /'
    echo ""
    echo "   - NOT purgeable"
    echo "   - Preserves ALL file operations"
    echo "   - Can't be deleted"
    echo "   - Only clears when macOS updates"
fi
echo ""

echo "🔒 THE CATCH-22:"
echo ""
echo "  Need: 17.64GB to install macOS update"
echo "  Problem: Can't free space (snapshot preserves everything)"
echo "  Result: Stuck"
echo ""

echo "✅ YOUR ONLY OPTIONS:"
echo ""
echo "1. **Contact Apple Support** (RECOMMENDED)"
echo "   Phone: 1-800-275-2273"
echo "   Explain: 'OS update snapshot preventing space recovery'"
echo "   They have system-level tools we don't have access to"
echo ""
echo "2. **Try GUI Update** (Sometimes works differently)"
echo "   System Settings → General → Software Update"
echo "   Click 'Update Now'"
echo "   GUI sometimes bypasses space checks"
echo ""
echo "3. **Boot from Recovery** (Advanced)"
echo "   - Restart holding Command+R"
echo "   - Try updating from Recovery Mode"
echo "   - May have different space requirements"
echo ""
echo "4. **Wait for Automatic Cleanup** (Unreliable)"
echo "   macOS may eventually clear old snapshots"
echo "   But this can take weeks/months"
echo ""

echo "📊 Current Situation:"
echo ""
echo "  Files moved: ✅ (Safe on NAS/external drive)"
echo "  Space freed: ❌ (Snapshot preserving them)"
echo "  System Data: 📈 (351GB+ and growing)"
echo "  Free space: ${FREE_SPACE_GB}GB (not enough)"
echo ""

echo "⚠️  IMPORTANT:"
echo ""
echo "Your files ARE safe. The space WILL be freed after updating."
echo "But you're in a system-level catch-22 that requires"
echo "Apple Support intervention or advanced recovery methods."
echo ""

echo "🎯 NEXT STEP:"
echo ""
echo "Call Apple Support: 1-800-275-2273"
echo "They can help with this specific issue."
echo ""