#!/usr/bin/env bash
function gvm_pkgset_use() {
	[[ "$1" != "" ]] ||
		display_error "Please specify a package set" || return 1

	[[ "$gvm_go_name" != "" ]] ||
		display_error "No Go version selected" || return 1

	if [[ "$1" == "--local" ]]; then
		. "$GVM_ROOT/scripts/function/find_local_pkgset"
		local LOCAL_TOP=$(find_local_pkgset)
		unset -f find_local_pkgset
		[[ -d $LOCAL_TOP ]] ||
			display_error "Cannot find local package set" || return 1
		LOCAL_TOP=$LOCAL_TOP/.gvm_local

		fuzzy_match=$($LS_PATH "$LOCAL_TOP/environments" | $SORT_PATH | $GREP_PATH "$gvm_go_name@" | $GREP_PATH "local" | $HEAD_PATH -n 1) ||
			display_error "Cannot find local package set" || return 1

		[[ "$2" != "--default" ]] ||
			display_error "Cannot set local pkgset as default" || return 1

		gvm_export_path
		. "$LOCAL_TOP/environments/$fuzzy_match" ||
			display_error "Failed to source the package set environment" || return 1

		echo "Now using version $gvm_go_name in local package set"
		echo "Local GOPATH is now $LOCAL_TOP"
	else
		fuzzy_match=$($LS_PATH "$GVM_ROOT/environments" | $SORT_PATH | $GREP_PATH "$gvm_go_name@" | $GREP_PATH "$1" | $HEAD_PATH -n 1) ||
			display_error "Invalid package set" || return 1

		gvm_export_path
		. "$GVM_ROOT/environments/$fuzzy_match" ||
			display_error "Failed to source the package set environment" || return 1

		if [[ "$2" == "--default" ]]; then
			cp "$GVM_ROOT/environments/$fuzzy_match" "$GVM_ROOT/environments/default"
		fi

		echo "Now using version $fuzzy_match"
	fi
}