#!/usr/bin/bash

base_name="$(basename "$0")"
path_name=rbdoom3bfg-launcher
conf_dir="${XDG_CONFIG_HOME:-$HOME/.config}"/"$path_name"
data_dir="${XDG_DATA_HOME:-$HOME/.local/share}"/"$path_name"

if [ -f "$(which yad)" ]; then
    gui="$(which yad) --splash --class=$base_name --name=$base_name --title=$base_name"
    file_select="$gui --file --directory"
fi
if [ -f "$(which zenity)" ]; then
    gui="$(which zenity) --class=$base_name --name=$base_name --title=$base_name"
    file_select="$gui --file-selection --directory"
fi

if [ ! -f "$(which mergerfs)" ]; then
    error_text="mergerfs is not installed."
    if [ -z "$gui" ]; then
        printf "%s: %s" "$(basename "$0")" "$error_text"
    else
        $gui --error --text="$error_text"
    fi
    exit 1
fi

if [ ! -d "$conf_dir" ]; then
    mkdir -p "$conf_dir"
fi

conf="$conf_dir"/launcher.conf
old_conf="$HOME"/.rbdoom3bfg/launcher.conf
if [ ! -f "$conf" ] && [ -f "$old_conf" ]; then
    mv "$old_conf" "$conf"
fi
if [ -f "$conf" ]; then
    source "$conf"
else
    echo "install_dir=\"\"" > "$conf"
fi

basepath=""
if [ -z "$install_dir" ]; then
    if [ -z "$gui" ]; then
        printf "%s: install_dir is not set." "$base_name"
        printf "\n\n"
        printf "\tThe default install locations will be searched.\n"
        printf "\tIf RBDoom3BFG fails to start, specify the Doom 3 BFG\n"
        printf "\tinstallation directory in %s.\n\n" "$conf"
    else
        info_text="install_dir is not set in the configuration file \n$conf\n"
        info_text+="Without it, the default locations will be searched for game files.\n"
        info_text+="\nDo you want to set it now?\n"
        if $gui --question --text="$info_text"; then
            install_dir="$($file_select)"
            if [ -n "$install_dir" ]; then
                echo "install_dir=\"$install_dir\"" >> "$conf"
            fi
        fi
    fi
fi

if [ -n "$install_dir" ]; then
    if [ ! -d "$data_dir" ]; then
        mkdir -p "$data_dir"
    fi
    mergerfs -o fsname=RBDoom3BFG /usr/share/games/doom3bfg:"$install_dir" "$data_dir"
    basepath="+set fs_basepath $data_dir"
fi

# Disable terminal support too, if the user knows
# what they are doing, they don't need the launcher anyways
RBDoom3BFG +set in_tty 0 $basepath "$@"

if mountpoint -q "$data_dir"; then
    umount "$data_dir"
fi
exit 0