post_install() {
    printf "You've successfully installed misskey!\n"
    if ! [ -f "/etc/webapps/misskey/default.yml" ]; then
        cp "/etc/webapps/misskey/example.yml" "/etc/webapps/misskey/default.yml"
        printf "There is a list of things you need to do now.\n"
        printf "1. Edit the default.yml to reflect your systems configuration\n"
        printf "2. Setup PostgreSQL\n"
        printf "3. Add a PostgreSQL user \"misskey\" and a database for this user also called \"misskey\"\n"
        printf "4. Startup redis.service\n"
        printf "^^^^^^^^ Only after thats done ^^^^^^^^\n"
        printf "5. Run the database initialisation as root user\n"
        printf "     cd \"/usr/share/webapps/misskey/\"\n"
        printf "     runuser -u misskey -- env HOME=\"/usr/share/webapps/misskey\" yarn run init\n"
        printf "6. Finally start misskey.service\n"
        printf "More on the setup: https://misskey-hub.net/en/docs/install/manual.html\n"
        printf "#TODO: Yes, this needs to be in the wiki."
    fi
    printf "You need to configure a reverse-proxy to grand network access localhost:3000\n"
}

## $1: new package version
## $2: old package version
pre_upgrade() {
    ## Ignore reinstallations of the same or older versions
    if [ $(vercmp $1 $2) -gt 0 ] ; then
        ## Shut down the misskey service before touching it's files
        if systemctl is-active misskey.service > /dev/null; then
            printf "Shutting down misskey\n"
            systemctl stop misskey.service
        fi
    fi
}

post_upgrade() {
    ## Ignore reinstallations of the same or older versions
    if [ $(vercmp $1 $2) -gt 0 ] ; then
        ## Dont do anything if there is no default configuration (not setup)
        if [ -f "/etc/webapps/misskey/default.yml" ]; then
            ## Migration needs PostgreSQL + redis running. Dont migrate if not running
            if systemctl is-active postgresql.service > /dev/null \
              && systemctl is-active redis.service > /dev/null; then 
                printf "Migrate data to new version\n"
                cd "/usr/share/webapps/misskey/"
                runuser -u misskey -- env HOME=/usr/share/webapps/misskey yarn migrate
                printf "Misskey service is *not* started\n"
                printf "Thats your job!\n"
            else
                printf "Misskey migration was not started because PostgreSQL and or redis is inactive."
                printf "Please start the services and run\n"
                printf "  cd /usr/share/webapps/misskey\n"
                printf "  HOME=/usr/share/webapps/misskey yarn migrate\n"
                printf "as misskey user manually\n"
            fi
        fi
    fi
}