#!/bin/bash

ICINGAWEB2_FILE_APACHE_DEFAULT=/etc/apache2/sites-available/000-default.conf
ICINGAWEB2_FILE_APACHE_PORTS=/etc/apache2/ports.conf
ICINGAWEB2_PORT=8080
ICINGAWEB2_WEBROOT=/data/usr/icingaweb2
ICINGAWEB2_WEBROOT_INIT=/data-init/usr/icingaweb2

## the webroot under /data is code from the image, config and state live in
## /data/etc/icingaweb2 and the database. when the image ships another icingaweb2
## version, the webroot has to follow, otherwise old assets, templates and modules
## run against the new php library (e.g. missing css/icinga/csp-config-editor.less).
## modules which are not part of the image stay untouched
icingaweb2_update_webroot() {
    local version_old version_new module_path module

    ## nothing to compare without the webroot template from the image
    [ -d "$ICINGAWEB2_WEBROOT_INIT" ] || return 0

    if [ ! -d "$ICINGAWEB2_WEBROOT" ]; then
        echo create icingaweb2 webroot from image
        mkdir -p "$ICINGAWEB2_WEBROOT"
        cp -a "$ICINGAWEB2_WEBROOT_INIT"/. "$ICINGAWEB2_WEBROOT"/
        chown -R 33:33 "$ICINGAWEB2_WEBROOT"
        return 0
    fi

    version_old="$(cat "$ICINGAWEB2_WEBROOT/VERSION" 2>/dev/null)"
    version_new="$(cat "$ICINGAWEB2_WEBROOT_INIT/VERSION" 2>/dev/null)"

    ## skip when the image carries no version to compare against
    [ -n "$version_new" ] || return 0

    ## skip when the webroot already runs the version from the image
    [ "$version_old" != "$version_new" ] || return 0

    echo "replace icingaweb2 webroot: ${version_old:-unknown} -> $version_new"

    ## keep one backup of the replaced webroot for comparisons
    rm -rf "${ICINGAWEB2_WEBROOT}.bak"
    if ! cp -ax "$ICINGAWEB2_WEBROOT" "${ICINGAWEB2_WEBROOT}.bak"; then
        echo "backup of $ICINGAWEB2_WEBROOT failed, keeping the current webroot" >&2
        return 1
    fi

    ## replace the modules shipped by the image, self installed ones are kept
    for module_path in "$ICINGAWEB2_WEBROOT_INIT"/modules/*/; do
        [ -d "$module_path" ] || continue
        module="$(basename "$module_path")"
        echo "replace module $module"
        rm -rf "$ICINGAWEB2_WEBROOT/modules/$module"
    done

    ## VERSION is the marker of this replacement, so it is replaced too
    rm -rf "$ICINGAWEB2_WEBROOT"/application \
           "$ICINGAWEB2_WEBROOT"/public \
           "$ICINGAWEB2_WEBROOT"/schema \
           "$ICINGAWEB2_WEBROOT"/doc \
           "$ICINGAWEB2_WEBROOT"/VERSION
    cp -a "$ICINGAWEB2_WEBROOT_INIT"/. "$ICINGAWEB2_WEBROOT"/

    chown -R 33:33 "$ICINGAWEB2_WEBROOT"

    for module_path in "$ICINGAWEB2_WEBROOT"/modules/*/; do
        [ -d "$module_path" ] || continue
        module="$(basename "$module_path")"
        [ -d "$ICINGAWEB2_WEBROOT_INIT/modules/$module" ] \
            || echo "keep module $module (not part of the image)"
    done
}

## init icinga config files if need
if [ -z "$(ls -A /data)" ]; then
    # enable python script for inital deployments
    ICINGAWEB2_CONF_ONCE=false
    export INIT_DB=true

    ## move init files
    echo init icingaweb2 config
    cp -ax /data-init/* /data
    rm -rf /data-init

    chown -R 33:33 /data
    
    ## check if a var exist they is must have for deployment
    ## because without this check, moduls init everytime and this blocks /setup page
    if [ ! -z "$ICINGAWEB2_DEFAULT_ADMIN_USER" ]; then
        ## enable modules
        icingacli module enable icingadb
        mkdir -p /etc/icingaweb2/modules/icingadb/
        
        icingacli module enable grafana
        mkdir -p /etc/icingaweb2/modules/grafana/
    else
        ## print setup token because no auto deployment will run
        icingacli setup token create;
    fi
fi

## follow the icingaweb2 version of the image, also when /data is already populated
if ! icingaweb2_update_webroot; then
    echo "warning: icingaweb2 webroot does not match the image version" >&2
fi

## apache setup
if [ ! -z "$ICINGAWEB2_PORT" ]; then
    echo set icingaweb2 apache ports
    sed -i "s|^Listen .*|Listen $ICINGAWEB2_PORT|" $ICINGAWEB2_FILE_APACHE_PORTS
    sed -i "s|VirtualHost \*:.*>|VirtualHost \*:$ICINGAWEB2_PORT>|g" $ICINGAWEB2_FILE_APACHE_DEFAULT
fi

## edit icingaweb2 config only on first setup or is enabled
if { [ -z "${ICINGAWEB2_CONF_ONCE+x}" ] || [ "$ICINGAWEB2_CONF_ONCE" = "false" ]; } \
    && [ -n "${ICINGAWEB2_DEFAULT_ADMIN_USER+x}" ]; then
    /usr/bin/python3 /root/conf_icingaweb2.py
fi

## init apache
. /etc/apache2/envvars

# icinga2 daemon -C -X ? 
# run CMD
exec "$@"