#!/usr/bin/env bash

# Cleanup
set -e
trap 'exit 1' SIGINT

# Constants
VERSION=2.0.0
template_dir="$HOME/Templates"
fd_opts=(--type f --threads "$(nproc)")

# Helper functions
function help() {
	cat <<HELPMESSAGE
$(basename "$0") $VERSION

Usage: $(basename "$0") [-h] [-d DIR] [-f] dest

Positional arguments:
  dest

options:
  -h, --help            show this help message and exit
  -d DIR, --template-dir DIR
                        choose a template directory (default: ~/Templates)
  -f, --force           overwrite dest if it exists
HELPMESSAGE
}

while true; do
	case "${1}" in
	'-d' | '--dir')
		template_dir="${2}"
		case "${DIR}" in
		"")
			exit 1
			;;
		-*)
			exit 1
			;;
		esac
		shift 2
		continue
		;;
	--dir=*)
		template_dir="${1#*=}"
		case "${DIR}" in
		"")
			exit 1
			;;
		-*)
			exit 1
			;;
		esac
		shift
		continue
		;;
	'-f' | '--force')
		FORCE_OVERWRITE='--force'
		shift
		continue
		;;
	'-h' | '--help')
		help
		exit
		;;
	--)
		shift
		break
		;;
	-*)
		printf '%s\n' "Unknown option: ${1}" >&2
		exit 1
		;;
	*)
		break
		;;
	esac
done

# If no target specified
if [[ -z "$1" ]]; then
	printf '%s\n' 'Please specify target name'
	exit 1
fi

# Check if template directory exists
if ! [[ -d "$template_dir" ]]; then
	printf '%s\n' "Template directory doesn't exist, exiting."
	exit 2
fi

files="$("${fd_opts[@]}" "$DIR")"
selected_file="$(fzf --select-1 --exit-0 <<< "$files")"

# Check if target exists
if [[ -f "$1" && -z "$FORCE_OVERWRITE" ]]; then
	printf '%s\n' 'File already exists, exiting'
	exit 1
elif [[ -f "$1" && -n "$FORCE_OVERWRITE" ]]; then
	cp --verbose --force -- "$selected_file" "$1"
else
	cp --verbose -- "$selected_file" "$1"
fi