#!/bin/bash
#
#  _____               _           _
# |   __|___ ___ ___ _| |___ _____| |_ ___ ___ ___
# |   __|  _| -_| -_| . | . |     | . | . |   | -_|
# |__|  |_| |___|___|___|___|_|_|_|___|___|_|_|___|
#
#                              Freedom in the Cloud
#
# The main issue here is bootstrapping. What is running
# on the bootstrap server publicbits.org port 6881 ?
#
# Also it appears that users trying to clone have to
# register an account on datbase.org or another datbase
# server
#
# License
# =======
#
# Copyright (C) 2018 Bob Mottram <bob@freedombone.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

VARIANTS='full full-vim'

IN_DEFAULT_INSTALL=0
SHOW_ON_ABOUT=0

DATSERVER_DOMAIN_NAME=
DATSERVER_CODE=
DATSERVER_HYPERCORED_VERSION='1.4.1'
DATSERVER_DIRECTORY=/etc/datserver
DATSERVER_PORT=3282

# bootstrap servers are specified here
DATSERVER_BOOTSTRAP_FILE=$DATSERVER_DIRECTORY/node_modules/datland-swarm-defaults/index.js

DATSERVER_DISCOVERY1='discovery1.publicbits.org'
DATSERVER_DISCOVERY2='discovery2.publicbits.org'
DATSERVER_BOOTSTRAP1='bootstrap1.publicbits.org:6881'
DATSERVER_BOOTSTRAP2='bootstrap2.publicbits.org:6881'
DATSERVER_BOOTSTRAP3='bootstrap3.publicbits.org:6881'
DATSERVER_BOOTSTRAP4='bootstrap4.publicbits.org:6881'

datserver_variables=(MY_USERNAME
                     DATSERVER_DISCOVERY1
                     DATSERVER_DISCOVERY2
                     DATSERVER_BOOTSTRAP1
                     DATSERVER_BOOTSTRAP2
                     DATSERVER_BOOTSTRAP3
                     DATSERVER_BOOTSTRAP4)

function datserver_generate_bootstraps {
  { echo "var extend = require('xtend')";
    echo '';
    echo "var DAT_DOMAIN = 'dat.local'";
    echo 'var DEFAULT_DISCOVERY = [';
    echo "  '$DATSERVER_DISCOVERY1',";
    echo "  '$DATSERVER_DISCOVERY2'";
    echo ']';
    echo 'var DEFAULT_BOOTSTRAP = [';
    echo "  '$DATSERVER_BOOTSTRAP1',";
    echo "  '$DATSERVER_BOOTSTRAP2',";
    echo "  '$DATSERVER_BOOTSTRAP3',";
    echo "  '$DATSERVER_BOOTSTRAP4'";
    echo ']';
    echo '';
    echo 'var DEFAULT_OPTS = {';
    echo '  dns: {server: DEFAULT_DISCOVERY, domain: DAT_DOMAIN},';
    echo '  dht: {bootstrap: DEFAULT_BOOTSTRAP}';
    echo '}';
    echo '';
    echo 'module.exports = function (opts) {';
    echo '  return extend(DEFAULT_OPTS, opts) // opts takes priority';
    echo '}'; } > $DATSERVER_BOOTSTRAP_FILE

  chown datserver:datserver $DATSERVER_BOOTSTRAP_FILE
}

function datserver_configure_bootstraps {
    read_config_param DATSERVER_DISCOVERY1
    read_config_param DATSERVER_DISCOVERY2

    read_config_param DATSERVER_BOOTSTRAP1
    read_config_param DATSERVER_BOOTSTRAP2
    read_config_param DATSERVER_BOOTSTRAP3
    read_config_param DATSERVER_BOOTSTRAP4

    data=$(mktemp 2>/dev/null)
    dialog --backtitle $"Freedombone Control Panel" \
           --title $"dat bootstrap servers" \
           --form $"Specify discovery and bootstrap servers:\\n" 14 68 6 \
           $"Discovery 1:" 1 1 "$DATSERVER_DISCOVERY1" 1 15 50 99 \
           $"Discovery 2:" 2 1 "$DATSERVER_DISCOVERY2" 2 15 50 99 \
           $"Bootstrap 1:" 3 1 "$DATSERVER_BOOTSTRAP1" 3 15 50 99 \
           $"Bootstrap 2:" 4 1 $"$DATSERVER_BOOTSTRAP2" 4 15 50 99 \
           $"Bootstrap 3:" 5 1 $"$DATSERVER_BOOTSTRAP3" 5 15 50 99 \
           $"Bootstrap 4:" 6 1 $"$DATSERVER_BOOTSTRAP4" 6 15 50 99 \
           2> "$data"
    sel=$?
    case $sel in
        1)  rm -f "$data"
            return;;
        255) rm -f "$data"
             return;;
    esac
    DATSERVER_DISCOVERY1=$(sed -n 1p < "$data")
    DATSERVER_DISCOVERY2=$(sed -n 2p < "$data")
    DATSERVER_BOOTSTRAP1=$(sed -n 3p < "$data")
    DATSERVER_BOOTSTRAP2=$(sed -n 4p < "$data")
    DATSERVER_BOOTSTRAP3=$(sed -n 4p < "$data")
    DATSERVER_BOOTSTRAP4=$(sed -n 4p < "$data")
    rm "$data"

    write_config_param DATSERVER_DISCOVERY1
    write_config_param DATSERVER_DISCOVERY2

    write_config_param DATSERVER_BOOTSTRAP1
    write_config_param DATSERVER_BOOTSTRAP2
    write_config_param DATSERVER_BOOTSTRAP3
    write_config_param DATSERVER_BOOTSTRAP4

    datserver_generate_bootstraps
    systemctl restart datserver
}

function logging_on_datserver {
    echo -n ''
}

function logging_off_datserver {
    echo -n ''
}

function remove_user_datserver {
    echo -n ''
}

function add_user_datserver {
    echo -n ''
    echo '0'
}

function change_password_datserver {
    echo -n ''
}

function install_interactive_datserver {
    echo -n ''
    APP_INSTALLED=1
}

function reconfigure_datserver {
    # This is used if you need to switch identity. Dump old keys and generate new ones
    echo -n ''
}

function datserver_add_dat {
    data=$(mktemp 2>/dev/null)
    dialog --title $"Add a dat" \
           --backtitle $"Freedombone Control Panel" \
           --inputbox $"dat link:" 8 70 2>"$data"
    sel=$?
    case $sel in
        0)
            dat_link=$(<"$data")
            if [ "$dat_link" ]; then
                if [ ${#dat_link} -gt 5 ]; then
                    if ! grep -q "$dat_link" $DATSERVER_DIRECTORY/feeds; then
                        echo "$dat_link" >> $DATSERVER_DIRECTORY/feeds
                        chown -R datserver:datserver $DATSERVER_DIRECTORY/feeds
                        systemctl restart datserver
                    fi
                fi
            fi
            ;;
    esac
    rm -f "$data"
}

function configure_interactive_datserver {
    W=(1 $"Add a dat"
       2 $"Browse or edit feeds"
       3 $"Bootstrap servers")

    while true
    do
        # shellcheck disable=SC2068
        selection=$(dialog --backtitle $"Freedombone Administrator Control Panel" --title $"dat server" --menu $"Choose an operation, or ESC for main menu:" 11 70 4 "${W[@]}" 3>&2 2>&1 1>&3)

        if [ ! "$selection" ]; then
           break
        fi
        case $selection in
            1) datserver_add_dat
               ;;
            2) cd $DATSERVER_DIRECTORY || break
               editor feeds
               chown -R datserver:datserver $DATSERVER_DIRECTORY/feeds
               systemctl restart datserver
               ;;
            3) datserver_configure_bootstraps
               ;;
        esac
    done
}

function upgrade_datserver {
    CURR_DATSERVER_HYPERCORED_VERSION=$(get_completion_param "datserver hypercored version")
    if [[ "$CURR_DATSERVER_HYPERCORED_VERSION" != "$DATSERVER_HYPERCORED_VERSION" ]]; then
        cd $DATSERVER_DIRECTORY || exit 254274
        systemctl stop datserver
        if npm update hypercored@$DATSERVER_HYPERCORED_VERSION; then
            set_completion_param "datserver hypercored version" "$DATSERVER_HYPERCORED_VERSION"
        fi
        datserver_generate_bootstraps
        chown -R datserver:datserver "$DATSERVER_DIRECTORY"
        systemctl restart datserver
    fi
}

function backup_local_datserver {
    source_directory=$DATSERVER_DIRECTORY

    systemctl stop datserver

    dest_directory=datserver
    backup_directory_to_usb "$source_directory" $dest_directory

    systemctl start datserver
}

function restore_local_datserver {
    systemctl stop datserver

    temp_restore_dir=/root/tempdatserver
    datserver_dir=$DATSERVER_DIRECTORY

    restore_directory_from_usb $temp_restore_dir datserver
    if [ -d $temp_restore_dir ]; then
        if [ -d "$temp_restore_dir$datserver_dir" ]; then
            cp -rp "$temp_restore_dir$datserver_dir"/* "$datserver_dir"/
        else
            if [ ! -d "$datserver_dir" ]; then
                mkdir "$datserver_dir"
            fi
            cp -rp "$temp_restore_dir"/* "$datserver_dir"/
        fi
        chown -R datserver:datserver "$datserver_dir"
        rm -rf $temp_restore_dir
    fi
    systemctl start datserver

}

function backup_remote_datserver {
    source_directory=$DATSERVER_DIRECTORY
    systemctl stop datserver

    dest_directory=datserver
    backup_directory_to_friend "$source_directory" $dest_directory

    systemctl start datserver
}

function restore_remote_datserver {
    systemctl stop datserver

    temp_restore_dir=/root/tempdatserver
    datserver_dir=$DATSERVER_DIRECTORY

    restore_directory_from_friend $temp_restore_dir datserver
    if [ -d $temp_restore_dir ]; then
        if [ -d "$temp_restore_dir$datserver_dir" ]; then
            cp -rp "$temp_restore_dir$datserver_dir"/* "$datserver_dir"/
        else
            if [ ! -d "$datserver_dir" ]; then
                mkdir "$datserver_dir"
            fi
            cp -rp $temp_restore_dir/* "$datserver_dir"/
        fi
        chown -R datserver:datserver "$datserver_dir"
        rm -rf $temp_restore_dir
    fi
    systemctl start datserver

}

function remove_datserver {
    if [ -f /etc/systemd/system/datserver.service ]; then
        systemctl stop datserver
        systemctl disable datserver
        rm /etc/systemd/system/datserver.service
    fi
    userdel -r datserver

    remove_nodejs datserver

    if [ -d $DATSERVER_DIRECTORY ]; then
        rm -rf $DATSERVER_DIRECTORY
    fi

    remove_app datserver
    remove_completion_param install_datserver
    sed -i '/datserver/d' "$COMPLETION_FILE"
    firewall_remove $DATSERVER_PORT
}

function install_datserver {
    apt-get -yq install wget

    install_nodejs datserver

    if [ -d $DATSERVER_DIRECTORY ]; then
        rm -rf $DATSERVER_DIRECTORY
    fi
    mkdir $DATSERVER_DIRECTORY
    cd $DATSERVER_DIRECTORY || exit 3658356

    if ! npm install hypercored@$DATSERVER_HYPERCORED_VERSION; then
        echo $'hypercored was not installed'
        exit 4635439
    fi

    if ! npm install lil-pids@2.6.1; then
        echo $'lil-pids was not installed'
        exit 36483463
    fi

    echo "$DATSERVER_DIRECTORY/node_modules/.bin/hypercored --cwd $DATSERVER_DIRECTORY" > $DATSERVER_DIRECTORY/services

    set_completion_param "datserver hypercored version" "$DATSERVER_HYPERCORED_VERSION"

    adduser --system --home="$DATSERVER_DIRECTORY" --group datserver
    if [ ! -d $DATSERVER_DIRECTORY ]; then
        echo $'dat directory was not created'
        exit 9568356
    fi

    datserver_generate_bootstraps

    chown -R datserver:datserver "$DATSERVER_DIRECTORY"

    firewall_add datserver $DATSERVER_PORT

    { echo '[Unit]';
      echo 'After=syslog.target network.target remote-fs.target nss-lookup.target';
      echo '';
      echo '[Service]';
      echo 'User=datserver';
      echo 'Group=datserver';
      echo "ExecStart=$DATSERVER_DIRECTORY/node_modules/.bin/lil-pids $DATSERVER_DIRECTORY/services $DATSERVER_DIRECTORY/pids";
      echo 'Restart=always';
      echo "WorkingDirectory=$DATSERVER_DIRECTORY";
      echo 'StandardError=syslog';
      echo '';
      echo '[Install]';
      echo 'WantedBy=multi-user.target'; } > /etc/systemd/system/datserver.service

    systemctl enable datserver
    systemctl start datserver

    APP_INSTALLED=1
}

# NOTE: deliberately there is no "exit 0"