#!/bin/bash

set -e

function print_help() {
	echo "usage .home/update.sh [-g/--gnome] [-h/--help] [-v/--berbose] [-d/--dry]

Installs and updates shared configuration on a system. Options are:

  -h/--help    : print this help
  --reinstall  : force reinstallation
  -g/--gnome   : system is intended to run in a GNOME environement, and
                 will setup gnome-terminal accordingly. Do not
                 activate on headless system.
  --font       : Installs font for gnome environment (selected if --gnome)
  -v/--verbose : prints command before running them
  -n/--dry     : dry run, do not execute commands. Implies --verbose.
"
}

function exit_error() {
	print_help
	exit 1
}

GNOME=false
FONT=false
VERBOSE=false
DRY=false
REINSTALL=false

function set_reinstall_on() {
	REINSTALL=true
}

function set_gnome_on() {
	GNOME=true
	FONT=true
}

function set_font_on() {
	FONT=true
}

function set_verbose_on() {
	VERBOSE=true
}

function set_dry_on() {
	DRY=true
	VERBOSE=true
}

while getopts "vnhg-:" optchar
do
	case "${optchar}" in
		-)
			case "${OPTARG}" in
				reinstall)
					set_reinstall_on
					;;
				gnome)
					set_gnome_on
					;;
				verbose)
					set_verbose_on
					;;
				font)
					set_font_on
					;;
				dry)
					set_dry_on
					;;
				*)
					echo "invalid argument --${OPTARG}"
					exit_error
					;;
			esac;;
		h)
			print_help
			exit 0
			;;
		g)
			set_gnome_on
			;;
		n)
			set_dry_on
			;;
		v)
			set_verbose_on
			;;
		*)
			exit_error
			;;
	esac
done


files=".config/fish \
.config/git \
.config/omf \
.config/starship.toml \
.local/share/omf \
.emacs \
.tmux.conf.local \
.config/alacritty.toml"




function this_script_root_dir() {
	dirname $(realpath ${BASH_SOURCE[0]})
}

function run() {
	if $VERBOSE
	then
		echo "[$@]"
	fi
	if ! $DRY
	then
	   $@
	fi
}

function run_git() {
	if $VERBOSE
	then
	   echo "[git $@] in $(this_script_root_dir)"
	fi
	if ! $DRY
	then
		pushd $(this_script_root_dir) 1>/dev/null
		if $VERBOSE
		then
			git $@
		else
			git $@ 1>/dev/null
		fi
		popd 1>/dev/null
	fi
}


function load_gnome_terminal_profiles() {
	echo "--- Installing GNOME terminal profile"
	if which dconf 1>/dev/null
	then
		run dconf load /org/gnome/terminal/legacy/profiles:/ < $(this_script_root_dir)/gnome-terminal-profiles.dconf
	fi
}

function install_fish() {
	echo "--- Ensuring fish is current shell"
	local fish_good=0
	if ! which fish 1>/dev/null
	then
		fish_good=1
	fi

	local current_version=$(fish --version | cut -d " " -f 3)
	local current_version_test=$(cat <<EOF
${current_version}
3.4.0
EOF
				)
	if [ $(echo "${current_version_test}" | sort -n | head -1) != "3.4.0" ]
	then
		echo "Wrong version of fish ${current_version}"
		fish_good=1
	fi

	if [ $fish_good -eq 1 ]
	then
		echo "+++ Installing fish from PPA"
		run sudo add-apt-repository -y ppa:fish-shell/release-3
		run sudo apt update
		run sudo apt install -y fish
	else
		echo "+++ Fish is installed"
    fi

    fish=$(which fish)
    current_shell=$(grep $USER /etc/passwd | cut -d ":" -f 7)
    if [ $current_shell != $fish ]
    then
		echo "+++ Changing shell to $fish (you will be prompted for passwd)"
		run chsh -s $fish
	else
		echo "+++ Default shell is $fish"
    fi
}

function install_direnv() {
	echo "--- Ensuring direnv is installed"
    if ! which direnv 1>/dev/null
    then
		echo "++ Installing direnv"
		run sudo apt-get install -y direnv
	else
		echo "+++ direnv is installed"
    fi
}


function install_starship() {
	echo "--- Ensuring starship is installed"
    if which starship 1>/dev/null
	then
		echo "+++ Starship is installed"
		if ! $REINSTALL
		then
			return
		fi
		echo "+++ Reinstalling starship"
	fi
	echo "+++ Installing starship"
	if $VERBOSE
	then
		echo "[curl -sS https://starship.rs/install.sh | sh -s -- --yes]"
	fi
	if ! $DRY
	then
		curl -sS https://starship.rs/install.sh | sh -s -- --yes
	fi
}

function install_ubuntu_mono_nerd() {
	echo "--- Ensuring Ubuntu Mono Nerd font is present"
	if [ ! -e /usr/share/terminfo/x/xterm-direct ]
	then
		run sudo apt-get install -y ncurses-term
	else
		echo "+++ xterm-direct is in terminfo database"
	fi

    if fc-list | grep "UbuntuMono Nerd Font" 1>/dev/null
	then
		echo "+++ UbuntuMono Nerd font is installed"
		if ! $REINSTALL
		then
			return
		fi
		echo "+++ Reinstalling UbuntuMono Nerd font"
	fi

	echo "+++ Fetching UbuntuMono Nerd Font"
	run mkdir -p ~/.local/share/fonts
	pushd ~/.local/share/fonts
	run curl -fL -o UbuntuMonoNerdFontMono-Regular.ttf https://github.com/ryanoasis/nerd-fonts/raw/master/patched-fonts/UbuntuMono/Regular/UbuntuMonoNerdFontMono-Regular.ttf
	popd
	run fc-cache -f

}

function install_deps() {
    install_fish
    install_direnv
    install_starship
	if $FONT
	then
		install_ubuntu_mono_nerd
	fi
}

function install_files() {
	echo "--- Ensuring symlinks to git file are present"
	for f in $files
	do
		run rm -Rf $HOME/$f
		dir=$(dirname $f)
		if [ ! "$dir" = "." ]
		then
			run mkdir -p $HOME/$dir
		fi
		run ln -sf $(this_script_root_dir)/$f $HOME/$f
	done
	run ln -sf $(this_script_root_dir)/.tmux/.tmux.conf $HOME/.tmux.conf
}

function update_oh_my_fish() {
	echo "--- Updating Oh My Fish"
	FISH=$(which fish)
	if $VERBOSE
	then
	   echo "[$FISH -c 'omf install']"
	fi
	if ! $DRY
	then
		if $VERBOSE
		then
			$FISH -c 'omf install'
		else
			$FISH -c 'omf install' 1>/dev/null
		fi
	fi
}

function update_home() {
	if $VERBOSE
	then
		echo "--- this_script_root_dir: $(this_script_root_dir)"
	fi
	update_repos
    install_deps
	install_files
	update_oh_my_fish
	if $GNOME
	then
		load_gnome_terminal_profiles
	fi
	if ! $DRY
	then
	   echo "--- git.tuleu.science:atuleu/home.git updated and set"
	fi
}

function update_repos() {
	echo "--- Updating git.tuleu.science:atuleu/home.git"
	run_git pull
	run_git submodule init
	run_git submodule update
}

if [ -z $BASH_SOURCE ] && [ ! -d "$HOME/.home" ]
then
	echo "--- cloning git.tuleu.science:atuleu/home.git in $HOME/.home"
	pushd $HOME 1>/dev/null
	run_git clone https://git.tuleu.science/atuleu/home.git .home
	popd 1>/dev/null
else
	update_home
fi