#!/bin/bash
#  _____               _           _
# |   __|___ ___ ___ _| |___ _____| |_ ___ ___ ___
# |   __|  _| -_| -_| . | . |     | . | . |   | -_|
# |__|  |_| |___|___|___|___|_|_|_|___|___|_|_|___|
#
#                              Freedom in the Cloud
#
# kanboard kanban
#
# License
# =======
#
# Copyright (C) 2017-2018 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 social'

IN_DEFAULT_INSTALL=0
SHOW_ON_ABOUT=1

KANBOARD_DOMAIN_NAME=
KANBOARD_CODE=
KANBOARD_ONION_PORT=8121
KANBOARD_REPO="https://github.com/kanboard/kanboard"
KANBOARD_COMMIT='7a6b1bc3da0af442e02b5a2dc430a4ded8e7c4ee'
KANBOARD_ADMIN_PASSWORD=

KANBOARD_SHORT_DESCRIPTION=$'Kanboard'
KANBOARD_DESCRIPTION=$'Kanboard kanban'
KANBOARD_MOBILE_APP_URL=

kanboard_variables=(ONION_ONLY
                    KANBOARD_DOMAIN_NAME
                    KANBOARD_CODE
                    DDNS_PROVIDER
                    MY_USERNAME)

function logging_on_kanboard {
    read_config_param KANBOARD_DOMAIN_NAME
    if [ $KANBOARD_DOMAIN_NAME ]; then
        kanboard_configfile=/var/www/${KANBOARD_DOMAIN_NAME}/htdocs/config.php
        if [ -f $kanboard_configfile ]; then
            sed -i "s|define('LOG_FILE'.*|define('LOG_FILE', DATA_DIR.DIRECTORY_SEPARATOR.'debug.log');|g" $kanboard_configfile
        fi
    fi
}

function logging_off_kanboard {
    read_config_param KANBOARD_DOMAIN_NAME
    if [ $KANBOARD_DOMAIN_NAME ]; then
        kanboard_configfile=/var/www/${KANBOARD_DOMAIN_NAME}/htdocs/config.php
        if [ -f $kanboard_configfile ]; then
            sed -i "s|define('LOG_FILE'.*|define('LOG_FILE', '/dev/null');|g" $kanboard_configfile
        fi
    fi
}

function remove_user_kanboard {
    remove_username="$1"

    "${PROJECT_NAME}-pass" -u "$remove_username" --rmapp kanboard
}

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

    "${PROJECT_NAME}-pass" -u "$new_username" -a kanboard -p "$new_user_password"
    echo '0'
}

function install_interactive_kanboard {
    if [ ! "$ONION_ONLY" ]; then
        ONION_ONLY='no'
    fi

    if [[ $ONION_ONLY != "no" ]]; then
        KANBOARD_DOMAIN_NAME='kanboard.local'
    else
        KANBOARD_DETAILS_COMPLETE=
        while [ ! $KANBOARD_DETAILS_COMPLETE ]
        do
            data=$(mktemp 2>/dev/null)
            if [[ $DDNS_PROVIDER == *"freedns"* ]]; then
                dialog --backtitle $"Freedombone Configuration" \
                       --title $"KanBoard Configuration" \
                       --form $"\\nPlease enter your KanBoard details.\\n\\nIMPORTANT: This should be a domain name which is supported by Let's Encrypt." 13 55 2 \
                       $"Domain:" 1 1 "$(grep 'KANBOARD_DOMAIN_NAME' temp.cfg | awk -F '=' '{print $2}')" 1 15 33 40 \
                       $"Code:" 2 1 "$(grep 'KANBOARD_CODE' temp.cfg | awk -F '=' '{print $2}')" 2 15 33 255 \
                       2> "$data"
            else
                dialog --backtitle $"Freedombone Configuration" \
                       --title $"KanBoard Configuration" \
                       --form $"\\nPlease enter your KanBoard details.\\n\\nIMPORTANT: This should be a domain name which is supported by Let's Encrypt." 13 55 2 \
                       $"Domain:" 1 1 "$(grep 'KANBOARD_DOMAIN_NAME' temp.cfg | awk -F '=' '{print $2}')" 1 15 33 40 \
                       2> "$data"
            fi
            sel=$?
            case $sel in
                1) rm -f "$data"
                   exit 1;;
                255) rm -f "$data"
                     exit 1;;
            esac
            KANBOARD_DOMAIN_NAME=$(sed -n 1p < "$data")
            if [ "$KANBOARD_DOMAIN_NAME" ]; then
                if [[ $KANBOARD_DOMAIN_NAME == "$HUBZILLA_DOMAIN_NAME" ]]; then
                    KANBOARD_DOMAIN_NAME=""
                fi
                TEST_DOMAIN_NAME=$KANBOARD_DOMAIN_NAME
                validate_domain_name
                if [[ "$TEST_DOMAIN_NAME" != "$KANBOARD_DOMAIN_NAME" ]]; then
                    KANBOARD_DOMAIN_NAME=
                    dialog --title $"Domain name validation" --msgbox "$TEST_DOMAIN_NAME" 15 50
                else
                    if [[ "$DDNS_PROVIDER" == *"freedns"* ]]; then
                        KANBOARD_CODE=$(sed -n 2p < "$data")
                        validate_freedns_code "$KANBOARD_CODE"
                        if [ ! "$VALID_CODE" ]; then
                            KANBOARD_DOMAIN_NAME=
                        fi
                    fi
                fi
            fi
            if [ $KANBOARD_DOMAIN_NAME ]; then
                KANBOARD_DETAILS_COMPLETE="yes"
            fi
            rm -f "$data"
        done

        # save the results in the config file
        write_config_param "KANBOARD_CODE" "$KANBOARD_CODE"
    fi
    write_config_param "KANBOARD_DOMAIN_NAME" "$KANBOARD_DOMAIN_NAME"
    APP_INSTALLED=1
}

function change_password_kanboard {
    curr_username="$1"
    new_user_password="$2"

    read_config_param 'KANBOARD_DOMAIN_NAME'

    "${PROJECT_NAME}-pass" -u "$curr_username" -a kanboard -p "$new_user_password"
}

function kanboard_create_database {
    if [ -f "$IMAGE_PASSWORD_FILE" ]; then
        KANBOARD_ADMIN_PASSWORD="$(printf "%s" "$(cat "$IMAGE_PASSWORD_FILE")")"
    else
        if [ ! "$KANBOARD_ADMIN_PASSWORD" ]; then
            KANBOARD_ADMIN_PASSWORD="$(create_password "${MINIMUM_PASSWORD_LENGTH}")"
        fi
    fi
    if [ ! "$KANBOARD_ADMIN_PASSWORD" ]; then
        return
    fi

    function_check create_database
    create_database kanboard "$KANBOARD_ADMIN_PASSWORD" "$MY_USERNAME"
}

function reconfigure_kanboard {
    echo -n ''
}

function upgrade_kanboard {
    CURR_KANBOARD_COMMIT=$(get_completion_param "kanboard commit")
    if [[ "$CURR_KANBOARD_COMMIT" == "$KANBOARD_COMMIT" ]]; then
        return
    fi

    if grep -q "kanboard domain" "$COMPLETION_FILE"; then
        KANBOARD_DOMAIN_NAME=$(get_completion_param "kanboard domain")
    fi

    # update to the next commit
    function_check set_repo_commit
    set_repo_commit "/var/www/$KANBOARD_DOMAIN_NAME/htdocs" "kanboard commit" "$KANBOARD_COMMIT" $KANBOARD_REPO

    chown -R www-data:www-data "/var/www/${KANBOARD_DOMAIN_NAME}/htdocs"
}


function backup_local_kanboard {
    KANBOARD_DOMAIN_NAME='kanboard'
    if grep -q "kanboard domain" "$COMPLETION_FILE"; then
        KANBOARD_DOMAIN_NAME=$(get_completion_param "kanboard domain")
    fi

    source_directory=/var/www/${KANBOARD_DOMAIN_NAME}/htdocs/backup
    if [ ! -d "$source_directory" ]; then
        mkdir "$source_directory"
    fi
    cp -p "/var/www/${KANBOARD_DOMAIN_NAME}/htdocs/config.php" "$source_directory"

    function_check suspend_site
    suspend_site "${KANBOARD_DOMAIN_NAME}"

    function_check backup_directory_to_usb
    dest_directory=kanboardconfig
    backup_directory_to_usb "$source_directory" "$dest_directory"

    source_directory=/var/www/${KANBOARD_DOMAIN_NAME}/htdocs/data
    dest_directory=kanboardfile
    backup_directory_to_usb "$source_directory" "$dest_directory"

    function_check backup_database_to_usb
    backup_database_to_usb kanboard

    function_check restart_site
    restart_site
}

function restore_local_kanboard {
    if ! grep -q "kanboard domain" "$COMPLETION_FILE"; then
        return
    fi
    KANBOARD_DOMAIN_NAME=$(get_completion_param "kanboard domain")
    if [ "$KANBOARD_DOMAIN_NAME" ]; then
        echo $"Restoring kanboard"
        temp_restore_dir=/root/tempkanboard
        kanboard_dir=/var/www/${KANBOARD_DOMAIN_NAME}/htdocs

        function_check kanboard_create_database
        kanboard_create_database

        restore_database kanboard
        if [ -d $temp_restore_dir ]; then
            rm -rf $temp_restore_dir
        fi

        function_check restore_directory_from_usb
        restore_directory_from_usb $temp_restore_dir kanboardconfig
        if [ -d $temp_restore_dir ]; then
            if [ -d "$temp_restore_dir$kanboard_dir/backup" ]; then
                cp "$temp_restore_dir$kanboard_dir/backup/config.php" "$kanboard_dir/"
            else
                cp "$temp_restore_dir/config.php" "$kanboard_dir/"
            fi
            chown www-data:www-data "$kanboard_dir/config.php"
            rm -rf $temp_restore_dir
        fi

        restore_directory_from_usb $temp_restore_dir kanboardfile
        if [ -d $temp_restore_dir ]; then
            if [ -d "$temp_restore_dir$kanboard_dir/data" ]; then
                cp -rp "$temp_restore_dir$kanboard_dir/data" "$kanboard_dir/"
            else
                if [ ! -d "$kanboard_dir/data" ]; then
                    mkdir "$kanboard_dir/data"
                fi
                cp -rp "$temp_restore_dir/"* "$kanboard_dir/data/"
            fi
            chown -R www-data:www-data "$kanboard_dir/data"
            rm -rf $temp_restore_dir
        fi

        kanboard_update_after_restore kanboard "${KANBOARD_DOMAIN_NAME}"

        echo $"Restore of kanboard complete"
    fi
}

function backup_remote_kanboard {
    KANBOARD_DOMAIN_NAME='kanboard'
    if grep -q "kanboard domain" "$COMPLETION_FILE"; then
        KANBOARD_DOMAIN_NAME=$(get_completion_param "kanboard domain")
    fi

    source_directory=/var/www/${KANBOARD_DOMAIN_NAME}/htdocs/backup
    if [ ! -d "$source_directory" ]; then
        mkdir "$source_directory"
    fi
    cp -p "/var/www/${KANBOARD_DOMAIN_NAME}/htdocs/config.php" "$source_directory"

    function_check suspend_site
    suspend_site "${KANBOARD_DOMAIN_NAME}"

    function_check backup_directory_to_friend
    dest_directory=kanboardconfig
    backup_directory_to_friend "$source_directory" "$dest_directory"

    source_directory=/var/www/${KANBOARD_DOMAIN_NAME}/htdocs/data
    dest_directory=kanboardfile
    backup_directory_to_friend "$source_directory" "$dest_directory"

    function_check backup_database_to_friend
    backup_database_to_friend kanboard

    function_check restart_site
    restart_site
}

function restore_remote_kanboard {
    if ! grep -q "kanboard domain" "$COMPLETION_FILE"; then
        return
    fi
    KANBOARD_DOMAIN_NAME=$(get_completion_param "kanboard domain")
    if [ "$KANBOARD_DOMAIN_NAME" ]; then
        echo $"Restoring kanboard"
        temp_restore_dir=/root/tempkanboard
        kanboard_dir=/var/www/${KANBOARD_DOMAIN_NAME}/htdocs

        function_check kanboard_create_database
        kanboard_create_database

        function_check restore_database_from_friend
        restore_database_from_friend kanboard
        if [ -d $temp_restore_dir ]; then
            rm -rf $temp_restore_dir
        fi

        function_check restore_directory_from_friend
        restore_directory_from_friend $temp_restore_dir kanboardconfig
        if [ -d $temp_restore_dir ]; then
            if [ -d "$temp_restore_dir$kanboard_dir/backup" ]; then
                cp "$temp_restore_dir$kanboard_dir/backup/config.php" "$kanboard_dir/"
            else
                cp "$temp_restore_dir/config.php" "$kanboard_dir/"
            fi
            chown www-data:www-data "$kanboard_dir/config.php"
            rm -rf $temp_restore_dir
        fi

        restore_directory_from_friend $temp_restore_dir kanboardfile
        if [ -d $temp_restore_dir ]; then
            if [ -d "$temp_restore_dir$kanboard_dir/data" ]; then
                cp -rp "$temp_restore_dir$kanboard_dir/data" "$kanboard_dir/"
            else
                if [ ! -d "$kanboard_dir/data" ]; then
                    mkdir "$kanboard_dir/data"
                fi
                cp -rp "$temp_restore_dir/"* "$kanboard_dir/data/"
            fi
            chown -R www-data:www-data "$kanboard_dir/data"
            rm -rf $temp_restore_dir
        fi

        kanboard_update_after_restore kanboard "${KANBOARD_DOMAIN_NAME}"

        echo $"Restore of kanboard complete"
    fi
}

function remove_kanboard {
    if [ ${#KANBOARD_DOMAIN_NAME} -eq 0 ]; then
        return
    fi
    read_config_param "KANBOARD_DOMAIN_NAME"
    read_config_param "MY_USERNAME"
    echo "Removing $KANBOARD_DOMAIN_NAME"
    nginx_dissite "$KANBOARD_DOMAIN_NAME"
    remove_certs "$KANBOARD_DOMAIN_NAME"

    if [ -d "/var/www/$KANBOARD_DOMAIN_NAME" ]; then
        rm -rf "/var/www/$KANBOARD_DOMAIN_NAME"
    fi
    if [ -f "/etc/nginx/sites-available/$KANBOARD_DOMAIN_NAME" ]; then
        rm "/etc/nginx/sites-available/$KANBOARD_DOMAIN_NAME"
    fi
    function_check drop_database
    drop_database kanboard
    function_check remove_onion_service
    remove_onion_service kanboard ${KANBOARD_ONION_PORT}
    remove_app kanboard
    remove_completion_param install_kanboard
    sed -i '/kanboard/d' "$COMPLETION_FILE"
    remove_backup_database_local kanboard

    function_check remove_ddns_domain
    remove_ddns_domain "$KANBOARD_DOMAIN_NAME"
}

function install_kanboard {
    if [ ! $ONION_ONLY ]; then
        ONION_ONLY='no'
    fi

    if [ ! "$KANBOARD_DOMAIN_NAME" ]; then
        echo $'No domain name was given for kanboard'
        exit 73478
    fi

    kanboard_hourly_script kanboard "$KANBOARD_DOMAIN_NAME"

    function_check install_mariadb
    install_mariadb

    function_check get_mariadb_password
    get_mariadb_password

    function_check repair_databases_script
    repair_databases_script

    apt-get -yq install php-gettext php-curl php-gd php-mysql git curl
    apt-get -yq install memcached php-memcached php-intl exiftool libfcgi0ldbl

    if [ ! -d "/var/www/$KANBOARD_DOMAIN_NAME" ]; then
        mkdir "/var/www/$KANBOARD_DOMAIN_NAME"
    fi
    if [ ! -d "/var/www/$KANBOARD_DOMAIN_NAME/htdocs" ]; then

        if [ -d /repos/kanboard ]; then
            mkdir "/var/www/$KANBOARD_DOMAIN_NAME/htdocs"
            cp -r -p /repos/kanboard/. "/var/www/$KANBOARD_DOMAIN_NAME/htdocs"
            cd "/var/www/$KANBOARD_DOMAIN_NAME/htdocs" || exit 2468274
            git pull
        else
            function_check git_clone
            git_clone "$KANBOARD_REPO" "/var/www/$KANBOARD_DOMAIN_NAME/htdocs"
        fi

        if [ ! -d "/var/www/$KANBOARD_DOMAIN_NAME/htdocs" ]; then
            echo $'Unable to clone kanboard repo'
            exit 89365
        fi
    fi

    cd "/var/www/$KANBOARD_DOMAIN_NAME/htdocs" || exit 234682642
    git checkout $KANBOARD_COMMIT -b $KANBOARD_COMMIT
    set_completion_param "kanboard commit" "$KANBOARD_COMMIT"

    chmod g+w "/var/www/$KANBOARD_DOMAIN_NAME/htdocs"
    chmod a+w "/var/www/$KANBOARD_DOMAIN_NAME/htdocs/data"
    chown -R www-data:www-data "/var/www/$KANBOARD_DOMAIN_NAME/htdocs"

    function_check kanboard_create_database
    kanboard_create_database

    if [ ! -f "/etc/aliases" ]; then
        touch /etc/aliases
    fi
    if ! grep -q "www-data: root" /etc/aliases; then
        echo 'www-data: root' >> /etc/aliases
    fi

    function_check add_ddns_domain
    add_ddns_domain "$KANBOARD_DOMAIN_NAME"

    KANBOARD_ONION_HOSTNAME=$(add_onion_service kanboard 80 ${KANBOARD_ONION_PORT})

    kanboard_nginx_site=/etc/nginx/sites-available/$KANBOARD_DOMAIN_NAME
    if [[ $ONION_ONLY == "no" ]]; then
        function_check nginx_http_redirect
        nginx_http_redirect "$KANBOARD_DOMAIN_NAME" "index index.php"
        { echo 'server {';
          echo '  listen 443 ssl;';
          echo '  #listen [::]:443 ssl;';
          echo "  server_name $KANBOARD_DOMAIN_NAME;";
          echo ''; } >> "$kanboard_nginx_site"
        function_check nginx_compress
        nginx_compress "$KANBOARD_DOMAIN_NAME"
        echo '' >> "$kanboard_nginx_site"
        echo '  # Security' >> "$kanboard_nginx_site"
        function_check nginx_ssl
        nginx_ssl "$KANBOARD_DOMAIN_NAME"

        function_check nginx_security_options
        nginx_security_options "$KANBOARD_DOMAIN_NAME"

        { echo '  add_header Strict-Transport-Security max-age=15768000;';
          echo '';
          echo '  # Logs';
          echo '  access_log /dev/null;';
          echo '  error_log /dev/null;';
          echo '';
          echo '  # Root';
          echo "  root /var/www/$KANBOARD_DOMAIN_NAME/htdocs;";
          echo '';
          echo '  # Index';
          echo '  index index.php;';
          echo '';
          echo '  # PHP';
          echo '  location ~ \.php {';
          echo '    include snippets/fastcgi-php.conf;';
          echo '    fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;';
          echo '    fastcgi_read_timeout 30;';
          echo '  }';
          echo '';
          echo '  # Location';
          echo '  location / {'; } >> "$kanboard_nginx_site"
        function_check nginx_limits
        nginx_limits "$KANBOARD_DOMAIN_NAME" '15m'
        { echo "    try_files \$uri \$uri/ @kanboard;";
          echo '  }';
          echo '';
          echo '  # Fancy URLs';
          echo '  location @kanboard {';
          echo "    rewrite ^(.*)\$ /index.php?p=\$1 last;";
          echo '  }';
          echo '';
          echo '  # Restrict access that is unnecessary anyway';
          echo '  location ~ /\.(ht|git) {';
          echo '    deny all;';
          echo '  }';
          echo '}'; } >> "$kanboard_nginx_site"
    else
        echo -n '' > "$kanboard_nginx_site"
    fi
    { echo 'server {';
      echo "    listen 127.0.0.1:$KANBOARD_ONION_PORT default_server;";
      echo "    server_name $KANBOARD_ONION_HOSTNAME;";
      echo ''; } >> "$kanboard_nginx_site"
    function_check nginx_compress
    nginx_compress "$KANBOARD_DOMAIN_NAME"
    echo '' >> "$kanboard_nginx_site"
    function_check nginx_security_options
    nginx_security_options "$KANBOARD_DOMAIN_NAME"
    { echo '';
      echo '  # Logs';
      echo '  access_log /dev/null;';
      echo '  error_log /dev/null;';
      echo '';
      echo '  # Root';
      echo "  root /var/www/$KANBOARD_DOMAIN_NAME/htdocs;";
      echo '';
      echo '  # Index';
      echo '  index index.php;';
      echo '';
      echo '  # PHP';
      echo '  location ~ \.php {';
      echo '    include snippets/fastcgi-php.conf;';
      echo '    fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;';
      echo '    fastcgi_read_timeout 30;';
      echo '  }';
      echo '';
      echo '  # Location';
      echo '  location / {'; } >> "$kanboard_nginx_site"
    function_check nginx_limits
    nginx_limits "$KANBOARD_DOMAIN_NAME" '15m'
    { echo "    try_files \$uri \$uri/ @kanboard;";
      echo '  }';
      echo '';
      echo '  # Fancy URLs';
      echo '  location @kanboard {';
      echo "    rewrite ^(.*)\$ /index.php?p=\$1 last;";
      echo '  }';
      echo '';
      echo '  # Restrict access that is unnecessary anyway';
      echo '  location ~ /\.(ht|git) {';
      echo '    deny all;';
      echo '  }';
      echo '}'; } >> "$kanboard_nginx_site"

    function_check configure_php
    configure_php

    function_check create_site_certificate
    create_site_certificate "$KANBOARD_DOMAIN_NAME" 'yes'

    # Ensure that the database gets backed up locally, if remote
    # backups are not being used
    function_check backup_databases_script_header
    backup_databases_script_header

    function_check backup_database_local
    backup_database_local kanboard

    function_check nginx_ensite
    nginx_ensite "$KANBOARD_DOMAIN_NAME"

    # Create the configuration
    kanboard_configfile="/var/www/${KANBOARD_DOMAIN_NAME}/htdocs/config.php"
    cp "/var/www/${KANBOARD_DOMAIN_NAME}/htdocs/config.default.php" "$kanboard_configfile"
    sed -i "s|define('MAIL_FROM'.*|define('MAIL_FROM', '$MY_EMAIL_ADDRESS');|g" "$kanboard_configfile"
    sed -i "s|define('DB_DRIVER'.*|define('DB_DRIVER', 'mysql');|g" "$kanboard_configfile"
    sed -i "s|define('DB_USERNAME'.*|define('DB_USERNAME', 'root');|g" "$kanboard_configfile"
    sed -i "s|define('DB_PASSWORD'.*|define('DB_PASSWORD', '$MARIADB_PASSWORD');|g" "$kanboard_configfile"
    sed -i "s|define('DB_HOSTNAME'.*|define('DB_HOSTNAME', 'localhost');|g" "$kanboard_configfile"
    sed -i "s|define('DB_NAME'.*|define('DB_NAME', 'kanboard');|g" "$kanboard_configfile"
    sed -i "s|define('DB_PORT'.*|define('DB_PORT', null);|g" "$kanboard_configfile"
    logging_off_kanboard

    initialise_database kanboard "/var/www/${KANBOARD_DOMAIN_NAME}/htdocs/app/Schema/Sql/mysql.sql"
    chown -R www-data:www-data "/var/www/${KANBOARD_DOMAIN_NAME}/htdocs"

    cd "/var/www/${KANBOARD_DOMAIN_NAME}/htdocs" || exit 24582468
    install_composer

    systemctl restart mariadb
    systemctl restart php7.0-fpm
    systemctl restart nginx

    "${PROJECT_NAME}-pass" -u "$MY_USERNAME" -a kanboard -p "$KANBOARD_ADMIN_PASSWORD"

    set_completion_param "kanboard domain" "$KANBOARD_DOMAIN_NAME"

    APP_INSTALLED=1
}

# NOTE: deliberately there is no "exit 0"