#!/bin/sh
set -eu

while getopts 'p:x:l:f:u' flag; do
	case "$flag" in
		p)
			PREFIX="$OPTARG"
			;;
		x)
			EXECUTABLES_EXPECTED="$OPTARG"
			;;
		l)
			SYMLINKS_EXPECTED="$OPTARG"
			;;
		f)
			FILES_EXPECTED="$OPTARG"
			;;
		u)
			UNINSTALL=1
			;;
		*)
			exit 2
			;;
	esac
done
shift $((OPTIND - 1))


if [ -n "${UNINSTALL:-}" ]; then
	if [ "$(find "$PREFIX" -type f | wc -l)" != 0 ]; then
		printf 'When uninstalling, left over files in the'
		printf 'PREFIX directory:\n'
		find "$PREFIX" -type f
		exit 1
	fi
	exit
fi

EXECUTABLES_ACTUAL="$(find "$PREFIX" -type f -perm -a=x | wc -l)"
if [ "${EXECUTABLES_EXPECTED:-0}" != "$EXECUTABLES_ACTUAL" ]; then
	printf 'Expected %s executables, found %s:\n' \
		"$EXECUTABLES_EXPECTED" "$EXECUTABLES_ACTUAL" >&2
	find "$PREFIX" -type f -perm -a=x
	exit 1
fi

SYMLINKS_ACTUAL="$(find "$PREFIX" -type l | wc -l)"
if [ "${SYMLINKS_EXPECTED:-0}" != "$SYMLINKS_ACTUAL" ]; then
	printf 'Expected %s symlinks, found %s:\n' \
		"$SYMLINKS_EXPECTED" "$SYMLINKS_ACTUAL" >&2
	find "$PREFIX" -type l
	exit 1
fi

FILES_ACTUAL="$(find "$PREFIX" -type f | wc -l)"
if [ "${FILES_EXPECTED:-0}" != "$FILES_ACTUAL" ]; then
	printf 'Expected %s files, found %s:\n' \
		"$FILES_EXPECTED" "$FILES_ACTUAL" >&2
	find "$PREFIX" -type f
	exit 1
fi