#!/bin/sh

set -e

echo "Running pre uninstallation script"

if [ "$1" = "upgrade" ]; then
    echo "Upgrade detected: systemd/init.d unit files for unified-monitoring-agent will not be removed."
    exit 0
fi

if command -v systemctl 2>&1 > /dev/null
then
    # these commands failing have no side-effects
    echo "Resetting unified-monitoring-agent related services if they were in failed state..."
    systemctl reset-failed unified-monitoring-agent.service || true
    systemctl reset-failed unified-monitoring-agent_restarter.service || true
    systemctl reset-failed unified-monitoring-agent_restarter.path || true
    systemctl reset-failed unified-monitoring-agent_config_downloader.service || true
    systemctl reset-failed unified-monitoring-agent_config_downloader.timer || true
    echo "Done."

    echo "Stopping unified-monitoring-agent related services..."
    systemctl stop unified-monitoring-agent.service
    systemctl stop unified-monitoring-agent_restarter.service
    systemctl stop unified-monitoring-agent_restarter.path
    systemctl stop unified-monitoring-agent_config_downloader.service
    systemctl stop unified-monitoring-agent_config_downloader.timer
    echo "Done."

    echo "Disabling unified-monitoring-agent related services..."
    systemctl disable unified-monitoring-agent.service
    systemctl disable unified-monitoring-agent_restarter.service
    systemctl disable unified-monitoring-agent_restarter.path
    systemctl disable unified-monitoring-agent_config_downloader.service
    systemctl disable unified-monitoring-agent_config_downloader.timer
    echo "Done."

    echo "Removing systemd unit files from /lib/systemd/system/..."
    rm -f /lib/systemd/system/unified-monitoring-agent.service
    rm -f /lib/systemd/system/unified-monitoring-agent_restarter.service
    rm -f /lib/systemd/system/unified-monitoring-agent_restarter.path
    rm -f /lib/systemd/system/unified-monitoring-agent_config_downloader.service
    rm -f /lib/systemd/system/unified-monitoring-agent_config_downloader.timer
    echo "Done."

    echo "Removing systemd unit files from /etc/systemd/system/..."
    rm -f /etc/systemd/system/unified-monitoring-agent.service
    rm -f /etc/systemd/system/unified-monitoring-agent_restarter.service
    rm -f /etc/systemd/system/unified-monitoring-agent_restarter.path
    rm -f /etc/systemd/system/unified-monitoring-agent_config_downloader.service
    rm -f /etc/systemd/system/unified-monitoring-agent_config_downloader.timer
    echo "Done."

    if [ unified-monitoring-agent = "griffin" ]
    then
        echo "cleaning griffin troubleshoot related systemd services"
        systemctl reset-failed griffin_troubleshoot.service || true
        systemctl reset-failed griffin_troubleshoot.timer || true
        systemctl stop griffin_troubleshoot.service
        systemctl stop griffin_troubleshoot.timer
        systemctl disable griffin_troubleshoot.service
        systemctl disable griffin_troubleshoot.timer
        rm -f /lib/systemd/system/griffin_troubleshoot.service
        rm -f /lib/systemd/system/griffin_troubleshoot.timer
        rm -f /etc/systemd/system/griffin_troubleshoot.service
        rm -f /etc/systemd/system/griffin_troubleshoot.timer
        rm -f /etc/griffin/griffin_doctor.sh
        echo "Done."
    fi

    echo "Reloading systemd daemon..."
    systemctl daemon-reload
    echo "Done."
fi

if [ -x "/etc/init.d/unified-monitoring-agent" ]; then
    invoke-rc.d unified-monitoring-agent stop || exit $?
    rm -f /etc/init.d/unified-monitoring-agent
    rm -f /usr/sbin/unified-monitoring-agent
    update-rc.d unified-monitoring-agent remove > /dev/null
fi