#!/bin/sh
# RPM %post — post-install/upgrade scriptlet (spec §7).
set -eu

STORE_DIR="/var/lib/fenris"
STORE_DB="${STORE_DIR}/observations.db"
STORE_BAK="${STORE_DIR}/observations.db.bak"
VENV_PYTHON="/opt/fenris/bin/python3"

if [ "$1" -eq 1 ]; then
    # Fresh install
    systemd-sysusers  || true
    systemd-tmpfiles --create  || true
    systemctl daemon-reload  || true
elif [ "$1" -ge 2 ]; then
    # Upgrade — snapshot, migration, daemon-reload, conditional timer restart
    if [ -f "${STORE_DB}" ]; then
        cp "${STORE_DB}" "${STORE_BAK}" 2>/dev/null || true
    fi
    if [ -x "${VENV_PYTHON}" ] && [ -f "${STORE_DB}" ]; then
        "${VENV_PYTHON}" -c "
from fenris.store import migrate_to_latest
from pathlib import Path
n = migrate_to_latest(Path('${STORE_DB}'))
print(f'Fenris migration: {n} step(s) applied') if n else None
" 2>&1 || echo "Fenris: migration skipped (store not yet initialized)"
    fi
    # Capture running unit content BEFORE daemon-reload (spec §7)
    RUNNING_UNITS=""
    for unit in fenris-collect.timer; do
        if systemctl is-active --quiet "${unit}" 2>/dev/null; then
            RUNNING_UNITS="${RUNNING_UNITS} ${unit}"
        fi
    done
    systemctl daemon-reload 2>/dev/null || true
    # Restart timer only if unit contents changed AND active
    for unit in ${RUNNING_UNITS}; do
        OLD_CONTENT="$(mktemp)"
        NEW_PATH="/usr/lib/systemd/system/${unit}"
        systemctl cat "${unit}" > "${OLD_CONTENT}" 2>/dev/null || true
        if ! diff -q "${OLD_CONTENT}" "${NEW_PATH}" > /dev/null 2>&1; then
            systemctl restart "${unit}" 2>/dev/null || true
        fi
        rm -f "${OLD_CONTENT}"
    done
fi