#!/usr/bin/env bash

#############################################################
# Author: Taryel Hlontsi, 2025
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>
#############################################################



#############################################################
#           SETUP SECTION, use "sudo" to run the script
#############################################################
LOG_DIR="/home/${USER}/Opt"
LOG="${LOG_DIR}/log.txt"
PREFIX="/home/${USER}/Opt/emacs30"
BRANCH="emacs-30"
SOURCE="https://github.com/emacs-mirror/emacs.git"
EMACS_DIR="/home/${USER}/.emacs.d/"

#############################################################
#          HELPER FUNCTIONS
#############################################################
info() {
    GREEN='\033[1;32m'
    NC='\033[0m'
    echo -e "${GREEN}$1${NC}"
    echo -e "INFO:\t$1" >> $LOG
}

trace() {
    YELLOW='\033[1;33m'
    NC='\033[0m'
    echo -e "${YELLOW}$1${NC}"
    echo -e "TRACE:\t$1" >> $LOG
}

warn() {
    PURPLE='\033[1;35m'
    NC='\033[0m'
    echo -e "${PURPLE}$1${NC}"
    echo -e "WARN:\t$1" >> $LOG
}

error() {
    RED='\033[1;31m'
    NC='\033[0m'
    echo -e "${RED}$1${NC}"
    echo -e "ERROR:\t$1" >> $LOG
}

#############################################################
#          1 - INSTALL ESSENTIAL PACKAGES
#############################################################
install_essential_packages() {
    local step_name='STEP 1 Installing essential packages'
    warn "Press enter to proceed with $step_name"; read
    info "$step_name"

    sudo dnf install -y \
        git \
        apt \
        ca-certificates \
        curl \
        gnupg2-gpg-agent \
        unzip \
        mupdf

    [[ $? -gt 0 ]] && { error "$step_name failed, stopping now"; exit 1; }

    info "done"
}

#############################################################
#          2 - INSTALL BUILD DEPENDENCIES FOR EMACS
#############################################################
install_emacs_build_dependencies() {
    local step_name='STEP 2 Installing packages for building Emacs'
    warn "Press enter to proceed with $step_name"; read
    info "$step_name"

    sudo dnf install -y \
         @c-development \
         @development-tools \
         autoconf \
         automake \
         texinfo \
         libtool \
         gtk3-devel \
         gtk2-devel \
         libXpm-devel \
         libjpeg-turbo-devel \
         giflib-devel \
         libtiff-devel \
         libpng-devel \
         librsvg2-devel \
         gnutls-devel \
         ncurses-devel \
         libxml2-devel \
         libxml2 \
         dbus-devel \
         libotf-devel \
         m17n-lib-devel \
         ImageMagick-devel \
         glib2-devel \
         gobject-introspection-devel \
         libacl-devel \
         webkit2gtk4.1-devel \
         libtree-sitter-devel \
         libgccjit-devel \
         jansson \
         jansson-devel


    [[ $? -gt 0 ]] && { error "$step_name failed, stopping now"; exit 1; }

    info "done"
}


#############################################################
#          3 - CLONE AND BUILD EMACS
#############################################################
clone_and_build_emacs() {
    local step_name='STEP 3 Building Emacs from source [./configure --help]'
    warn "Press enter to proceed with $step_name"; read
    info "$step_name"

    git clone $SOURCE -b $BRANCH
    cd emacs
    rm etc/emacsclient.desktop
    ./autogen.sh

    ./configure \
    --with-native-compilation=aot \
    --with-json \
    --with-tree-sitter \
    --with-imagemagick \
    --with-rsvg \
    --with-xwidgets \
    --with-pgtk \
    --with-x-toolkit=gtk3 \
    --disable-silent-rules \
    --exec_prefix=$PREFIX \
    --prefix=$PREFIX

    make -j$(nproc)
    sudo make install

    [[ $? -gt 0 ]] && { error "$step_name failed, stopping now"; exit 1; }

    cd ..

    info "done"
}


#############################################################
#          4 - CLONE EMACS CONFIG
#############################################################
clone_emacs_config() {
    local step_name='STEP 4 Cloning emacs config to ~/.emacs.d'
    warn "Press enter to proceed with $step_name"; read
    info "$step_name"

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

    mkdir -p $EMACS_DIR && \
        git clone https://gittar.crabdance.com/tar/.emacs.d.git $EMACS_DIR

    [[ $? -gt 0 ]] && { error 'cloning emacs config failed, stopping now'; exit 1; }

    trace "Emacs will throw a lot of compilation warnings on first startup - that's ok"
    trace "To install the icons you need to run: M-x nerd-icons-install-fonts"

    info "done"
}


#############################################################
#          RUN SECTION
#############################################################
user=$(whoami)
if [ $user == root ]; then
        error "You are using a root account, start without sudo!"
        exit 1
fi

echo $(date +'%Y-%m-%d %H:%M') > $LOG

info "Hiya!"

sudo dnf update
sudo dnf upgrade -y

install_essential_packages
install_emacs_build_dependencies
clone_and_build_emacs
clone_emacs_config

info "Reboot (!) before starting Emacs"
info "Bye!"
info "PS. Log is here: ${LOG}"
warn "M-x nerd-icons-install-fonts"

exit 0