#!/usr/bin/env bash

##################################################
# Name: rustinit
# Description: initialises the folder structure for a new rust app
##################################################

clear

#set -x                             # Enable debug
set -E                              # Inherit ERR trap in functions
set -e                              # Exit immediately on non-zero exit status
set -u                              # Exit on unbound variable
set -o pipefail                     # Fail on non-zero status from pipeline

# Enable globbing (bashism)
shopt -s globstar
shopt -s extglob

##################################################
# Variables
##################################################

# Name of the script
SCRIPT=${0##*/}

##################################################
# Functions
##################################################

pushd () {

    command pushd "$@" > /dev/null

}

popd () {

    command popd > /dev/null

}

function usage() {

    clear
    cat <<- EOF

    Usage:

        ${SCRIPT}

EOF

}

function getConfirmation() {

	local CHOICE

    echo -e "\\n"
    read -p "Y/N: " -n 1 -r CHOICE
    echo -e "\\n"

    # If the answer was anything other than a "Y" exit
    if [[ ! "${CHOICE}" =~ ^[Yy]$ ]];
    then
        rustaceanGoodbye
    else
        return 0
    fi

}

function getProjectType() {

	local CHOICE

    echo -e "\\n"
    read -p "Are you creating a 'lib' or 'bin' rust project?: " -n 3 -r CHOICE
    echo -e "\\n"

	case "${CHOICE}" in

		bin | app )

			export TYPE="bin"

		;;

		lib | dep )

			export TYPE="lib"

		;;

		* )

			echo "Unknown choice entered of ${CHOICE}"
			return 1

		;;

	esac

	return 0

}

function rustaceanGoodbye() {

    clear
    echo -e "\\n"
    echo -e "\\t\\tGoodbye, and may the crabs be with you"
    echo -e "\\n"

	cat <<- "EOF"

	    _~^~^~_
	\) /  o o  \ (/
	  '_   u   _'
	  \ '-----' /

	EOF

    exit 0

}

##################################################
# Main
##################################################

pushd .

PROJECT=$(basename "$(pwd)")

getProjectType || { echo "Failed to determine project type" ; exit 1 ; }

echo -e "Generate new Rust project ${PROJECT} of type ${TYPE} in $(pwd)"
getConfirmation

cargo new "${PROJECT}" --"${TYPE}" --vcs none

popd

exit 0