#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# Brain Dead Simple Mail Server for i2p
#
# 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=1

BDSMAIL_REPO="https://github.com/majestrate/bdsmail"
BDSMAIL_COMMIT='6a2296b0b8e6c3da61081b85802e7b1cc88ca285'

bdsmail=(MY_USERNAME)

function logging_on_bdsmail {
    echo -n ''
}

function logging_off_bdsmail {
    echo -n ''
}

function remove_user_bdsmail {
    remove_username="$1"
}

function add_user_bdsmail {
    new_username="$1"
    new_user_password="$2"

    if [ ! -d /home/$new_username/.mutt ]; then
        mkdir /home/$new_username/.mutt
        cp /etc/skel/.mutt/bdsmail /home/$new_username/.mutt
    fi
    sed -i "s|username|$new_username|g" /home/$new_username/.mutt/bdsmail
    chown -R $new_username:$new_username /home/$new_username/.mutt
    echo '0'
}

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

function change_password_bdsmail {
    curr_username="$1"
    new_user_password="$2"
}

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

function upgrade_bdsmail {
    CURR_BDSMAIL_COMMIT=$(get_completion_param "bdsmail commit")
    if [[ "$CURR_BDSMAIL_COMMIT" == "$BDSMAIL_COMMIT" ]]; then
        return
    fi

    # update to the next commit
    set_repo_commit /etc/bdsmail "bdsmail commit" "$BDSMAIL_COMMIT" $BDSMAIL_REPO
    chown -R bdsmail:bdsmail /etc/bdsmail
}

function backup_local_bdsmail {
    systemctl stop bdsmail

    source_directory=/etc/bdsmail

    function_check backup_directory_to_usb
    dest_directory=bdsmail
    backup_directory_to_usb $source_directory $dest_directory

    systemctl start bdsmail
}

function restore_local_bdsmail {
    systemctl stop bdsmail

    temp_restore_dir=/root/tempbdsmail
    bdsmail_dir=/etc/bdsmail

    function_check restore_directory_from_usb
    restore_directory_from_usb $temp_restore_dir bdsmail
    if [ -d $temp_restore_dir ]; then
        if [ -d cp $temp_restore_dir$bdsmail_dir ]; then
            cp -rp $temp_restore_dir$bdsmail_dir $bdsmail_dir/
        else
            if [ ! -d $bdsmail_dir ]; then
                mkdir $bdsmail_dir
            fi
            cp -rp $temp_restore_dir/* $bdsmail_dir
        fi
        chown -R bdsmail:bdsmail $bdsmail_dir
        rm -rf $temp_restore_dir
    fi

    systemctl start bdsmail
}

function backup_remote_bdsmail {
    systemctl stop bdsmail

    source_directory=/etc/bdsmail

    function_check backup_directory_to_friend
    dest_directory=bdsmail
    backup_directory_to_friend $source_directory $dest_directory

    systemctl start bdsmail
}

function restore_remote_bdsmail {
    systemctl stop bdsmail

    temp_restore_dir=/root/tempbdsmail
    bdsmail_dir=/etc/bdsmail

    function_check restore_directory_from_friend
    restore_directory_from_friend $temp_restore_dir bdsmail
    if [ -d $temp_restore_dir ]; then
        if [ -d cp $temp_restore_dir$bdsmail_dir ]; then
            cp -rp $temp_restore_dir$bdsmail_dir $bdsmail_dir/
        else
            if [ ! -d $bdsmail_dir ]; then
                mkdir $bdsmail_dir
            fi
            cp -rp $temp_restore_dir/* $bdsmail_dir
        fi
        chown -R bdsmail:bdsmail $bdsmail_dir
        rm -rf $temp_restore_dir
    fi

    systemctl start bdsmail
}

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

    remove_app bdsmail
    remove_completion_param install_bdsmail
    sed -i '/bdsmail/d' $COMPLETION_FILE
    rm -rf /etc/skel/.mutt
    remove_i2p
}

function install_bdsmail {
    if [ -d /etc/bdsmail ]; then
        rm -rf /etc/bdsmail
    fi

    if [ -d /repos/bdsmail ]; then
        mkdir /etc/bdsmail
        cp -r -p /repos/bdsmail/. /etc/bdsmail
        cd /etc/bdsmail
        git pull
    else
        git_clone $BDSMAIL_REPO /etc/bdsmail
    fi

    if [ ! -d /etc/bdsmail ]; then
        echo $'Unable to clone bdsmail repo'
        exit 5735735
    fi

    cd /etc/bdsmail
    git checkout $BDSMAIL_COMMIT -b $BDSMAIL_COMMIT
    set_completion_param "bdsmail commit" "$BDSMAIL_COMMIT"

    useradd -d /etc/bdsmail -s /bin/false bdsmail

    make GOROOT=/home/go/go${GO_VERSION}
    if [ ! -f /etc/bdsmail/bin/bdsconfig ]; then
        echo $'Unable to make bdsmail'
        exit 87923567842
    fi

    install_i2p

    # create configuration file
    /etc/bdsmail/bin/bdsconfig > /etc/bdsmail/config.ini
    echo '[maild]' > /etc/bdsmail/config.ini
    echo 'i2paddr = 127.0.0.1:7656' >> /etc/bdsmail/config.ini
    echo 'i2pkeyfile = bdsmail-privkey.dat' >> /etc/bdsmail/config.ini
    echo 'bindmail = 127.0.0.1:2525' >> /etc/bdsmail/config.ini
    echo 'bindweb = 127.0.0.1:8489' >> /etc/bdsmail/config.ini
    echo 'domain = localhost' >> /etc/bdsmail/config.ini
    echo 'maildir = mail' >> /etc/bdsmail/config.ini
    echo 'database = localhost.sqlite' >> /etc/bdsmail/config.ini
    echo 'assets = contrib/assets/web' >> /etc/bdsmail/config.ini

    echo '[Unit]' > /etc/systemd/system/bdsmail.service
    echo 'Description=bdsmail' >> /etc/systemd/system/bdsmail.service
    echo 'After=syslog.target' >> /etc/systemd/system/bdsmail.service
    echo 'After=network.target' >> /etc/systemd/system/bdsmail.service
    echo '' >> /etc/systemd/system/bdsmail.service
    echo '[Service]' >> /etc/systemd/system/bdsmail.service
    echo 'Type=simple' >> /etc/systemd/system/bdsmail.service
    echo 'User=bdsmail' >> /etc/systemd/system/bdsmail.service
    echo 'Group=bdsmail' >> /etc/systemd/system/bdsmail.service
    echo 'WorkingDirectory=/etc/bdsmail' >> /etc/systemd/system/bdsmail.service
    echo 'ExecStart=/etc/bdsmail/bin/maild /etc/bdsmail/config.ini' >> /etc/systemd/system/bdsmail.service
    echo 'Restart=always' >> /etc/systemd/system/bdsmail.service
    echo 'Environment="USER=bdsmail"' >> /etc/systemd/system/bdsmail.service
    echo '' >> /etc/systemd/system/bdsmail.service
    echo '[Install]' >> /etc/systemd/system/bdsmail.service
    echo 'WantedBy=multi-user.target' >> /etc/systemd/system/bdsmail.service
    systemctl enable bdsmail
    chown -R bdsmail:bdsmail /etc/bdsmail
    systemctl start bdsmail

    echo '#!/usr/bin/env python2' > /etc/bdsmail/get_address
    echo 'import base64, hashlib, sys' >> /etc/bdsmail/get_address
    echo 'with open(sys.argv[1]) as f:' >> /etc/bdsmail/get_address
    echo "    print(base64.b32encode(hashlib.sha256(base64.b64decode(f.read(516), '-~')).digest()).strip('=')+\".b32.i2p\")" >> /etc/bdsmail/get_address
    chmod +x /etc/bdsmail/get_address

    echo '#!/bin/bash' > /usr/bin/bdsmail_domain
    echo 'cd /etc/bdsmail' >> /usr/bin/bdsmail_domain
    echo 'python2 get_address bdsmail-privkey.dat' >> /usr/bin/bdsmail_domain
    chmod +x /usr/bin/bdsmail_domain

    # wait for domain to be generated by the daemon
    sleep 10

    bds_domain=$(bdsmail_domain)
    if [ ! $bds_domain ]; then
        echo $'Failed to get the bdsmail domain'
        exit 8934638
    fi

    # Create mutt configuration
    mkdir /etc/skel/.mutt
    echo 'set mbox_type=Maildir' > /etc/skel/.mutt/bdsmail
    echo 'set smtp_url=smtp://127.0.0.1:2525/' >> /etc/skel/.mutt/bdsmail
    echo 'set use_from=yes' >> /etc/skel/.mutt/bdsmail
    echo "set from=username@${bds_domain}" >> /etc/skel/.mutt/bdsmail
    echo 'set spoolfile=/etc/bdsmail/mail/username' >> /etc/skel/.mutt/bdsmail

    # mutt configuration for the admin user
    if [ ! -d /home/$MY_USERNAME/.mutt ]; then
        mkdir /home/$MY_USERNAME/.mutt
    fi
    cp /etc/skel/.mutt/bdsmail /home/$MY_USERNAME/.mutt
    sed -i "s|username|$MY_USERNAME|g" /home/$MY_USERNAME/.mutt/bdsmail
    chown -R $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/.mutt

    APP_INSTALLED=1
}

# NOTE: deliberately there is no "exit 0"