#!/bin/bash

set -e

function install {
    # prefer running as root
    local dir="$(dirname "$0")"
    local program="comfortable-swipe"
    local program_exe="/usr/local/bin/$program"
    local compile_command="$dir/cpp.compile.sh"
    local compile_target="$dir/comfortable-swipe.cpp"
    local conf_path="/usr/local/share/$program/$program.conf"
    local dconf_path="$dir/defaults.conf"
    local old_conf_path="${XDG_CONFIG_HOME:-$HOME/.config}/$program.conf"

    if [ -x "$(command -v "$program_exe")" ]; then
        # stop any running $program if it exists
        "$program_exe" stop > /dev/null
    fi

    #copy config file
    abort () {
        exec echo "Installation aborted"
    }
    sudo mkdir -p "$(dirname $conf_path)" || abort

    # check if "-y" or "--yes" is passed as an argument
    YES=false
    while test $# -gt 0
    do
        case "$1" in
            -y) YES=true
                ;;
            --yes) YES=true
                ;;
        esac
        shift
    done

    sudo chown $USER "$(dirname $conf_path)"
    if [ ! -f "$conf_path" ]; then
        if [ ! -f "$old_conf_path" ]; then
            # old config file not found, create from scratch
            cat "$dconf_path" > "$conf_path" || abort
        else
            # old config file found, move to the new path
            cat "$old_conf_path" > "$conf_path" || abort
            echo "Configuration copied from $old_conf_path to $conf_path"
        fi
    else
        # config file found, ask user if overwrite
        echo "Old conf file found in $conf_path"
        if [ "$YES" == false ]; then
            read -r -p "Keep the old conf file? (default: yes) [Y/n] " response
            response="${response,,}" # tolower
            if [[ "$response" =~ ^(no|n)$ ]]; then
                read -r -p "Conf file will be overwritten. Are you sure? [Y/n] " response
                response="${response,,}"
                if [[ "$response" =~ ^(yes|y)$ ]]; then
                    cat "$dconf_path" > "$conf_path" || abort
                else
                    abort
                fi
            fi
        fi
    fi

    echo "Installing to $program_exe ..."

    # remove existing $program
    if [ -x "$(command -v "$program_exe")" ]; then
        sudo rm -f "$(which "$program")"
    fi

    # compile library
    sudo "$compile_command" "$compile_target" -o "$program_exe" || abort

    # add permissions to input group (defer)
    # GROUP=$(ls -l /dev/input/event* | awk '{print $4}' | head --line=1) || abort

    # turn on autostart by default
    local autostart_status="$("$program_exe" autostart)"
    if [[ "$autostart_status" == *off* ]]; then
        autostart_status="$("$program_exe" autostart)"
    fi

    echo "Successfully installed $program $(cat $dir/VERSION | tr -d '[:space:]')"
    echo ""
    echo "$autostart_status"
    echo "Edit configuration file: gedit \$($program config)"
    echo ""
    echo "Try running: $program start"
}

install
unset -f install