package main

import (
	"bufio"
	"os"
	"slices"
	"strings"
)

type character interface {
	int | rune
}

// Returns all elements in slice A that are NOT in slice B
func setDifference[T comparable](s1 []T, s2 []T) []T {
	toReturn := make([]T, 0, len(s1))
	for _, val := range s1 {
		if !slices.Contains(s2, val) {
			toReturn = append(toReturn, val)
		}
	}
	return toReturn
}

// Generate numbers in a range - start (inclusive) to end (exclusive)
func genRange[T character](start, end T) []T {
	toRet := make([]T, end-start)
	for i := start; i < end; i++ {
		toRet[i-start] = i
	}
	return toRet
}

// Returns whether or not the given file contains a NULL character
func fileContainsNullChar(filename string) (bool, error) {
	file, err := os.Open(filename)
	if err != nil {
		return true, err
	}
	defer file.Close()
	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		line := scanner.Text()
		if strings.Contains(line, "\000") {
			return true, nil
		}
	}
	if err := scanner.Err(); err != nil {
		return true, err
	}
	return false, nil
}