#!/bin/bash
#  _____               _           _
# |   __|___ ___ ___ _| |___ _____| |_ ___ ___ ___
# |   __|  _| -_| -_| . | . |     | . | . |   | -_|
# |__|  |_| |___|___|___|___|_|_|_|___|___|_|_|___|
#
#                              Freedom in the Cloud
#
# Emacs application
#
# License
# =======
#
# Copyright (C) 2014-2018 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'

IN_DEFAULT_INSTALL=1
SHOW_ON_ABOUT=0

emacs_variables=(USB_MOUNT
                 MY_USERNAME
                 DEFAULT_LANGUAGE)

function logging_on_emacs {
    echo -n ''
}

function logging_off_emacs {
    echo -n ''
}

function reconfigure_emacs {
    echo -n ''
}

function upgrade_emacs {
    echo -n ''
}

function backup_local_emacs {
    for d in /home/*/ ; do
        USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
        if [[ $(is_valid_user "$USERNAME") == "1" ]]; then
            if [ -d "/home/$USERNAME/.emacs.d" ]; then
                echo $"Backing up Emacs config for $USERNAME"
                if [ -f "/home/$USERNAME/.emacs" ]; then
                    cp "/home/$USERNAME/.emacs" "/home/$USERNAME/.emacs.d/dotemacs"
                fi
                function_check backup_directory_to_usb
                backup_directory_to_usb "/home/$USERNAME/.emacs.d" "emacs/$USERNAME"
            fi
        fi
    done
}

function restore_local_emacs {
    temp_restore_dir=/root/tempemacs
    if [ -d "$USB_MOUNT/backup/emacs" ]; then
        for d in $USB_MOUNT/backup/emacs/*/ ; do
            USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
            if [[ $(is_valid_user "$USERNAME") == "1" ]]; then
                if [ ! -d "/home/$USERNAME" ]; then
                    "${PROJECT_NAME}-adduser" "$USERNAME"
                fi
                echo $"Restoring Emacs config for $USERNAME"
                function_check restore_directory_from_usb
                restore_directory_from_usb "$temp_restore_dir" "emacs/$USERNAME"
                if [ -d "$temp_restore_dir/home/$USERNAME/.emacs.d" ]; then
                    cp -r "$temp_restore_dir/home/$USERNAME/.emacs.d" "/home/$USERNAME/"
                else
                    if [ ! -d "/home/$USERNAME/.emacs.d" ]; then
                        mkdir "/home/$USERNAME/.emacs.d"
                    fi
                    cp -r "$temp_restore_dir/"* "/home/$USERNAME/.emacs.d"
                fi
                # shellcheck disable=SC2181
                if [ ! "$?" = "0" ]; then
                    rm -rf $temp_restore_dir
                    function_check set_user_permissions
                    set_user_permissions
                    function_check backup_unmount_drive
                    backup_unmount_drive
                    exit 664
                fi
                if [ -d "$temp_restore_dir/home/$USERNAME/.emacs.d" ]; then
                    cp -f "$temp_restore_dir/home/$USERNAME/.emacs.d/dotemacs" "/home/$USERNAME/.emacs"
                else
                    cp -f "$temp_restore_dir/dotemacs" "/home/$USERNAME/.emacs"
                fi
                rm -rf $temp_restore_dir
            fi
        done
    fi
}

function backup_remote_emacs {
    for d in /home/*/ ; do
        USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
        if [[ $(is_valid_user "$USERNAME") == "1" ]]; then
            if [ -d "/home/$USERNAME/.emacs.d" ]; then
                echo $"Backing up Emacs config for $USERNAME"
                if [ -f "/home/$USERNAME/.emacs" ]; then
                    cp "/home/$USERNAME/.emacs" "/home/$USERNAME/.emacs.d/dotemacs"
                fi
                function_check backup_directory_to_friend
                backup_directory_to_friend "/home/$USERNAME/.emacs.d" "emacs/$USERNAME"
            fi
        fi
    done
}

function restore_remote_emacs {
    temp_restore_dir=/root/tempemacs
    if [ -d "$USB_MOUNT/backup/emacs" ]; then
        for d in $USB_MOUNT/backup/emacs/*/ ; do
            USERNAME=$(echo "$d" | awk -F '/' '{print $6}')
            if [[ $(is_valid_user "$USERNAME") == "1" ]]; then
                if [ ! -d "/home/$USERNAME" ]; then
                    "${PROJECT_NAME}-adduser" "$USERNAME"
                fi
                echo $"Restoring Emacs config for $USERNAME"
                function_check restore_directory_from_friend
                restore_directory_from_friend "$temp_restore_dir" "emacs/$USERNAME"
                if [ -d "$temp_restore_dir/home/$USERNAME/.emacs.d" ]; then
                    cp -r "$temp_restore_dir/home/$USERNAME/.emacs.d" "/home/$USERNAME/"
                else
                    if [ ! -d "/home/$USERNAME/.emacs.d" ]; then
                        mkdir "/home/$USERNAME/.emacs.d"
                    fi
                    cp -r "$temp_restore_dir/"* "/home/$USERNAME/.emacs.d/"
                fi
                # shellcheck disable=SC2181
                if [ ! "$?" = "0" ]; then
                    rm -rf $temp_restore_dir
                    function_check set_user_permissions
                    set_user_permissions
                    function_check backup_unmount_drive
                    backup_unmount_drive
                    exit 664
                fi
                if [ -d "$temp_restore_dir/home/$USERNAME/.emacs.d" ]; then
                    cp -f "$temp_restore_dir/home/$USERNAME/.emacs.d/dotemacs" "/home/$USERNAME/.emacs"
                else
                    cp -f "$temp_restore_dir/dotemacs" "/home/$USERNAME/.emacs"
                fi
                rm -rf $temp_restore_dir
            fi
        done
    fi
}

function remove_emacs {
    apt-get -yq remove --purge emacs
    update-alternatives --set editor /usr/bin/nano
    sed -i '/install_emacs/d' "$COMPLETION_FILE"

    # remove emacs as the mutt email editor
    if [ -f /etc/Muttrc ]; then
        if grep -q "set editor=" /etc/Muttrc; then
            sed -i '/set editor=/d' /etc/Muttrc
        fi
        for d in /home/*/ ; do
            USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
            if [[ $(is_valid_user "$USERNAME") == "1" ]]; then
                if [ -f "/home/$USERNAME/.muttrc" ]; then
                    if grep -q "set editor=" "/home/$USERNAME/.muttrc"; then
                        sed -i '/set editor=/d' "/home/$USERNAME/.muttrc"
                    fi
                fi
            fi
        done
    fi
}

function install_emacs {
    apt-get -yq install emacs ispell ibritish ifrench ispanish iitalian irussian iswedish inorwegian iirish ingerman iswiss iogerman idutch idanish ibrazilian ibulgarian ipolish iczech iestonian ilithuanian iukrainian icatalan
    update-alternatives --set editor /usr/bin/emacs24

    # A minimal emacs configuration
    #echo -n "(add-to-list 'load-path " > /home/$MY_USERNAME/.emacs
    #echo '"~/.emacs.d/")' >> /home/$MY_USERNAME/.emacs
    #echo '' >> /home/$MY_USERNAME/.emacs
    { echo $';; ===== Remove trailing whitepace ======================================';
      echo '';
      echo ";;(add-hook 'before-save-hook 'delete-trailing-whitespace)";
      echo '';
      echo ';; Goto a line number with CTRL-l';
      echo -n '(global-set-key "\C-l" ';
      echo "'goto-line)";
      echo '';
      echo $';; ===== Show line numbers ==============================================';
      echo '';
      echo "(add-hook 'find-file-hook (lambda () (linum-mode 1)))";
      echo '';
      echo $';; ===== Enable line wrapping in org-mode ===============================';
      echo '';
      echo " (add-hook 'org-mode-hook";
      echo "           '(lambda ()";
      echo "              (visual-line-mode 1)))";
      echo '';
      echo $';; ===== Enable shift select in org mode ================================';
      echo '';
      echo '(setq org-support-shift-select t)';
      echo '';
      echo $';; ===== Set standard indent to 4 rather that 4 =========================';
      echo '';
      echo '(setq standard-indent 4)';
      echo '(setq-default tab-width 4)';
      echo '(setq c-basic-offset 4)';
      echo '';
      echo $';; ===== Support Wheel Mouse Scrolling ==================================';
      echo '';
      echo '(mouse-wheel-mode t)';
      echo '';
      echo $';; ===== Place Backup Files in Specific Directory =======================';
      echo '';
      echo '(setq make-backup-files t)';
      echo '(setq version-control t)';
      echo '(setq backup-directory-alist (quote ((".*" . "~/.emacs_backups/"))))';
      echo '';
      echo $';; ===== Make Text mode the default mode for new buffers ================';
      echo '';
      echo "(setq default-major-mode 'text-mode)";
      echo '';
      echo $';; ===== Line length ====================================================';
      echo '';
      echo '(setq-default fill-column 72)';
      echo '';
      echo $';; ===== Enable Line and Column Numbering ===============================';
      echo '';
      echo '(line-number-mode 1)';
      echo '(column-number-mode 1)';
      echo '';
      echo $';; ===== Turn on Auto Fill mode automatically in all modes ==============';
      echo '';
      echo ';; Auto-fill-mode the the automatic wrapping of lines and insertion of';
      echo ';; newlines when the cursor goes over the column limit.';
      echo '';
      echo ';; This should actually turn on auto-fill-mode by default in all major';
      echo ';; modes. The other way to do this is to turn on the fill for specific modes';
      echo ';; via hooks.';
      echo '';
      echo '(setq auto-fill-mode 1)';
      echo '';
      echo $';; ===== Enable GPG encryption =========================================';
      echo '';
      echo "(require 'epa)";
      echo '(epa-file-enable)'; } >> "/home/$MY_USERNAME/.emacs"
    cp "/home/$MY_USERNAME/.emacs" /root/.emacs
    chown "$MY_USERNAME":"$MY_USERNAME" "/home/$MY_USERNAME/.emacs"

    # add a mutt entry to use emacs to compose emails
    if [ -f /etc/Muttrc ]; then
        if ! grep -q "set editor=" /etc/Muttrc; then
            echo 'set editor="emacs -q --load ~/.emacs-mutt"' >> /etc/Muttrc
        else
            sed -i 's|set editor=.*|set editor="emacs -q --load ~/.emacs-mutt"|g' /etc/Muttrc
        fi
        for d in /home/*/ ; do
            USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
            if [[ $(is_valid_user "$USERNAME") == "1" ]]; then
                if [ -f "/home/$USERNAME/.muttrc" ]; then
                    if ! grep -q "set editor=" "/home/$USERNAME/.muttrc"; then
                        echo 'set editor="emacs -q --load ~/.emacs-mutt"' >> "/home/$USERNAME/.muttrc"
                    else
                        sed -i 's|set editor=.*|set editor="emacs -q --load ~/.emacs-mutt"|g' "/home/$USERNAME/.muttrc"
                    fi
                fi

                # create an Emacs configuration specifically for use with Mutt, which
                # has word wrap and spell checking on by default
                if [ ! -f "/home/$USERNAME/.emacs-mutt" ]; then
                    { echo "(add-hook 'before-save-hook 'delete-trailing-whitespace)";
                    echo '(setq org-support-shift-select t)';
                    echo '(setq standard-indent 4)';
                    echo '(setq-default tab-width 4)';
                    echo '(setq c-basic-offset 4)';
                    echo '(mouse-wheel-mode t)';
                    echo '(setq make-backup-files t)';
                    echo '(setq version-control t)';
                    echo '(setq backup-directory-alist (quote ((".*" . "~/.emacs_backups/"))))';
                    echo "(setq default-major-mode 'text-mode)";
                    echo "(dolist (hook '(text-mode-hook))";
                    echo '    (add-hook hook (lambda () (flyspell-mode 1))))';
                    echo '(setq-default fill-column 72)'; } > "/home/$USERNAME/.emacs-mutt"
                    if [[ $DEFAULT_LANGUAGE == 'en_US'* ]]; then
                        echo '(setq ispell-dictionary "american")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'en_GB'* ]]; then
                        echo '(setq ispell-dictionary "british")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'fr_FR'* ]]; then
                        echo '(setq ispell-dictionary "french")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'it_IT'* ]]; then
                        echo '(setq ispell-dictionary "italian")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'cs_CZ'* ]]; then
                        echo '(setq ispell-dictionary "czech")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'da_DK'* ]]; then
                        echo '(setq ispell-dictionary "danish")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'nl_NL'* ]]; then
                        echo '(setq ispell-dictionary "dutch")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'ru_RU'* ]]; then
                        echo '(setq ispell-dictionary "russian")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'es_ES'* ]]; then
                        echo '(setq ispell-dictionary "spanish")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'sv_SE'* ]]; then
                        echo '(setq ispell-dictionary "swedish")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'no_NO'* ]]; then
                        echo '(setq ispell-dictionary "norwegian")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'de_DE'* ]]; then
                        echo '(setq ispell-dictionary "ngerman")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'bg_BG'* ]]; then
                        echo '(setq ispell-dictionary "bulgarian")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'pl'* ]]; then
                        echo '(setq ispell-dictionary "polish")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'et_EE'* ]]; then
                        echo '(setq ispell-dictionary "estonian")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'lt_LT'* ]]; then
                        echo '(setq ispell-dictionary "lithuanian")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'uk_UA'* ]]; then
                        echo '(setq ispell-dictionary "ukranian")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    if [[ $DEFAULT_LANGUAGE == 'ca_ES'* ]]; then
                        echo '(setq ispell-dictionary "catalan")' >> "/home/$USERNAME/.emacs-mutt"
                    fi
                    { echo '(setq auto-fill-mode 0)';
                      echo "(add-hook 'text-mode-hook 'turn-on-auto-fill)";
                      echo "(setq-default auto-fill-function 'do-auto-fill)"; } >> "/home/$USERNAME/.emacs-mutt"
                    chown "$USERNAME":"$USERNAME" "/home/$USERNAME/.emacs-mutt"

                    # add the emacs mutt configuration to the user profile skeleton
                    if [ ! -f /etc/skel/.emacs-mutt ]; then
                        cp "/home/$USERNAME/.emacs-mutt" /etc/skel/.emacs-mutt
                        chown root:root /etc/skel/.emacs-mutt
                    fi
                fi

            fi
        done
    fi

    APP_INSTALLED=1
}

function install_interactive_emacs {
    install_emacs
}

# NOTE: deliberately no exit 0