#!/usr/bin/env bash

if [[ -z "$XDG_CONFIG_HOME" ]]; then
	export XDG_CONFIG_HOME="$HOME/.config"
fi

dfp=$(cd "$(dirname "${BASH_SOURCE[0]}" )/" && pwd)

ALERT_AGREEMENT_FILE="$dfp/.agreed-to-erasing-files.lock"

# Let user know that this script will delete their current configuration and
# that they should read this script before running. We'll use a lock file so
# the user only needs to agree once.
if [ -f "$ALERT_AGREEMENT_FILE" ]; then
	# User agreed already - do nothing
	echo "Linking..."
else
	echo "Running this script may delete existing personal configuration files."
	echo "Please view this script's source, fully understand it, and backup any"
	echo "files before continuing."
	echo "Seriously. Like... entire directories. Just gone."
	read -r -p "Are you sure you want to continue? [y/N] " response
	response=${response,,} # to lower case
	if [[ $response =~ ^(yes|y)$ ]]; then
		echo "agreed" > "$ALERT_AGREEMENT_FILE"
	else
		exit 1
	fi
fi

# TODO: make sure we have an even number, here
links=(
	# desktop environment files
	"$dfp/de/sway/config"                    "$XDG_CONFIG_HOME/sway/config"
	"$dfp/de/bspwm/bspwmrc"                  "$XDG_CONFIG_HOME/bspwm/bspwmrc"
	"$dfp/de/sxhkd/sxhkdrc"                  "$XDG_CONFIG_HOME/sxhkd/sxhkdrc"
	"$dfp/de/x/resources"                    "$HOME/.Xresources"
	"$dfp/de/x/initrc"                       "$HOME/.xinitrc"
	"$dfp/de/x/profile"                      "$HOME/.xprofile"
	"$dfp/de/x/modmap"                       "$HOME/.xmodmap"
	"$dfp/de/compton/compton.conf"           "$XDG_CONFIG_HOME/compton.conf"
	"$dfp/scripts/colors/xresources"         "$HOME/.Xresources.colors"

	# shell files
	"$dfp/shell/bash/bashrc"                 "$HOME/.bashrc"
	"$dfp/shell/bash/bash_profile"           "$HOME/.bash_profile"
	"$dfp/shell/tmux/tmux.conf"              "$HOME/.tmux.conf"
	"$dfp/shell/tmux/layouts"                "$HOME/.tmux/layouts"

	# text editor files
	"$dfp/apps/neovim/"                      "$XDG_CONFIG_HOME/nvim"
	"$dfp/apps/neovim/"                      "$HOME/.vim"
	"$dfp/apps/neovim/init.vim"              "$HOME/.vimrc"
	"$dfp/scripts/colors/vim"                "$XDG_CONFIG_HOME/nvim/colors/base16-donokai.vim"

	# gtk configuration files
	"$dfp/de/gtk/2rc"                     "$HOME/.gtkrc-2.0"
	"$dfp/de/gtk/2rc"                     "$HOME/.gtkrc"
	"$dfp/de/gtk/3settings.ini"           "$XDG_CONFIG_HOME/gtk-3.0/settings.ini"

	# irc files
	"$dfp/apps/irssi/"                       "$HOME/.irssi"
	"$dfp/apps/weechat/"                     "$HOME/.weechat"

	# qutebrowser config files
	"$dfp/apps/qutebrowser/qutebrowser.conf" "$XDG_CONFIG_HOME/qutebrowser/qutebrowser.conf"
	"$dfp/apps/qutebrowser/keys.conf"        "$XDG_CONFIG_HOME/qutebrowser/keys.conf"

	# document viewer
	"$dfp/apps/zathura/"                     "$XDG_CONFIG_HOME/zathura"

	# terminal emulator
	"$dfp/apps/alacritty/"                   "$XDG_CONFIG_HOME/alacritty"

	# rofi config
	"$dfp/apps/rofi/config"                  "$XDG_CONFIG_HOME/rofi/config"

	# bar files
	"$dfp/de/bar/polybar-config"             "$XDG_CONFIG_HOME/polybar/config"

	# ranger config
	"$dfp/apps/ranger/"                      "$XDG_CONFIG_HOME/ranger"

	# mutt config
	"$dfp/apps/mutt/muttrc"                  "$XDG_CONFIG_HOME/.muttrc"
	"$dfp/apps/mutt/muttrc"                  "$HOME/.muttrc"

	# neofetch config
	"$dfp/apps/neofetch/config"              "$XDG_CONFIG_HOME/neofetch/config"

	# git config
	"$dfp/apps/git/config"                   "$HOME/.gitconfig"

	# fontconfig
	"$dfp/de/fontconfig/"                    "$XDG_CONFIG_HOME/fontconfig"

	# XDG user directories
	"$dfp/shell/user-dirs"                   "$XDG_CONFIG_HOME/user-dirs.dirs"
)

source=""
for i in "${links[@]}"; do
	if [ -n "$source" ]; then
		if [ -L "$i" ]; then # if symlink exists, delete it
			rm -rf "$i"
		fi
		if [ -f "$i" ]; then # if file exists, delete it
			rm -rf "$i"
		fi
		if [ -d "$i" ]; then # if directory exists, delete it
			rm -rf "$i"
		fi
		# check if the directory that will contain the link exists
		DIR_TO_LINK=$(dirname "$i")
		if [ -d "$DIR_TO_LINK" ]; then
			:
		else
			mkdir -p "$DIR_TO_LINK"
		fi
		ln -s "$source" "$i"
		echo "Linked $(basename $source) to $i."
		source=""
	else
		source="$i"
	fi
done

echo "Done."