#!/usr/bin/env bash

## constants

BASEDIR=$(dirname "$0")
BASECMD=$(basename "$0")
DB_NAME=sympa
DB_USER="$DB_NAME"
DB_PASS="$DB_NAME"

## functions

function usage {
	echo "$BASECMD <file.sympa>"
}

function assert_file {
	[[ $# != 1 ]] && usage && exit 1
	file="$1"
	[[ ! -f $file ]] && echo "file not found: $file" && exit 2
	true
}

function create_temp {
	echo -n "create_temp..."
	export_name=$(basename $file)
	export_tmp="/tmp/$export_name"
	mkdir "$export_tmp"
	echo OK
}

function uncompress_export_file {
	echo -n "uncompress export file..."
	tar -xf $file -C "$export_tmp"
	echo OK
}

function import_database {
	echo -n "import database $DB_NAME..."
	sudo -u postgres dropdb "$DB_NAME" 2>/dev/null
	sudo -u postgres createdb -O "$DB_USER" "$DB_NAME" 2>/dev/null
	gunzip "$export_tmp"/database.psql.gz | PGPASSWORD="$DB_PASS" psql -h localhost -U "$DB_USER" "$DB_NAME"
	echo OK
}

function replace_conf_entry_from_export {
	local export_conf=etc/sympa/sympa/sympa.conf
	local final_conf="/$export_conf"
	local key="$1"
	local pattern="^$key.*"
	local replacement=$(grep $pattern $export_conf)
	local ksh93=${replacement//\//\\/}
	sed -i "s/$pattern/$ksh93/" "$final_conf"
}

function import_files_etc {
	mv etc/sympa/auth.conf /etc/sympa/
	mv etc/sympa/data_structure.version /etc/sympa/

	replace_conf_entry_from_export domain
	replace_conf_entry_from_export listmaster
	replace_conf_entry_from_export wwsympa_url
	replace_conf_entry_from_export lang	
}

function import_files_sympa_lib {
	rm -rf /var/lib/sympa
	mv var/lib/sympa /var/lib
}

function import_files_sympa_spool {
	rm -rf /var/spool/sympa
	mv var/spool/sympa /var/spool
}

function import_files_postfix {
	mv etc/postfix/main.cf /etc/postfix/
	mv etc/dkimkeys/mail.private /etc/dkimkeys/

	rm -rf /etc/letsencrypt
	mv etc/letsencrypt /etc
}

function import_files {
	echo -n "import files..."
	files_temp="$export_tmp/files"
	mkdir "$files_temp"
	cd "$files_temp"
	
	tar -xf "$export_tmp/files.tar.gz"
	import_files_etc
	import_files_sympa_lib
	import_files_sympa_spool
	import_files_postfix

	echo OK
}

function migrate_sympa {
	echo -n "migrate sympa..."
	/usr/lib/sympa/bin/sympa.pl upgrade 2>&1
	echo OK
}

function stop_services {
	echo -n "stop services..."
	sudo systemctl stop sympa.service
	sudo systemctl stop wwsympa.socket
	echo OK
}

function start_services {
	echo -n "start services..."
	sudo systemctl start sympa.service
	sudo systemctl start wwsympa.socket
	echo OK
}

function remove_temp {
	echo -n "remove temp..."
	rm -rf "$export_tmp"
	echo OK
}

function import {
	create_temp
	uncompress_export_file

	stop_services
	import_database
	import_files
	start_services
	migrate_sympa

	remove_temp
}

## main

# execute as root or use `sudo`
[[ $(id -u) != 0 ]] && exec sudo $(dirname "$0")/$(basename "$0")

set -Eeu
assert_file $*
import