package fizzbuzz

import "fmt"

// inputs represent the inputs received by the fizzbuzz server
type inputs struct {
	string1, string2  string
	int1, int2, limit int
}

// generateFizzbuzz creates the fizzbuzz-like output related to the current input
// It is lenient with invalid inputs (nil input, <1 limits, empty strings or nul integers, ...)
func (in *inputs) generateFizzbuzz() []string {
	out := []string{}
	if in == nil {
		return out
	}
	for j := 1; j <= in.limit; j++ {
		multipleOf1, multipleOf2 := isAMultiple(j, in.int1), isAMultiple(j, in.int2)
		switch {
		case multipleOf1 && multipleOf2:
			out = append(out, in.string1+in.string2)
		case multipleOf1:
			out = append(out, in.string1)
		case multipleOf2:
			out = append(out, in.string2)
		default:
			out = append(out, fmt.Sprint(j))
		}
	}
	return out
}

func isAMultiple(toTest, divisor int) bool {
	if divisor == 0 {
		return false
	}
	return (toTest % divisor) == 0
}