#!/bin/bash
# compare_inventory.sh - Compare current inventory against baseline
# Claude Sonnet 4.5

BASELINE_DIR="/var/log/app_inventory/baseline"
CURRENT_DIR="/var/log/app_inventory/current"
HOSTNAME=$(hostname -s)

mkdir -p ${BASELINE_DIR} ${CURRENT_DIR}

# Run current inventory
/usr/local/bin/app_inventory.sh > ${CURRENT_DIR}/${HOSTNAME}_$(date +%Y%m%d_%H%M%S).txt

# If no baseline exists, make this the baseline
if [ ! -f ${BASELINE_DIR}/${HOSTNAME}_baseline.txt ]; then
    echo "No baseline found - creating baseline from current run"
    cp ${CURRENT_DIR}/${HOSTNAME}_$(date +%Y%m%d_%H%M%S).txt ${BASELINE_DIR}/${HOSTNAME}_baseline.txt
    exit 0
fi

# Compare
echo "=========================================="
echo "Comparing current vs baseline for ${HOSTNAME}"
echo "=========================================="
echo

CURRENT=$(ls -t ${CURRENT_DIR}/${HOSTNAME}_*.txt | head -1)
BASELINE=${BASELINE_DIR}/${HOSTNAME}_baseline.txt

diff -u ${BASELINE} ${CURRENT} | grep -E '^\+|^\-' | grep -v '^\+\+\+|^\-\-\-' | grep -v 'Date:'