package common

import (
	"testing"
)

func TestShortenId(t *testing.T) {
	id := GenerateRandomID()
	truncID := TruncateID(id)
	if len(truncID) != 12 {
		t.Fatalf("Id returned is incorrect: truncate on %s returned %s", id, truncID)
	}
}

func TestShortenIdEmpty(t *testing.T) {
	id := ""
	truncID := TruncateID(id)
	if len(truncID) > len(id) {
		t.Fatalf("Id returned is incorrect: truncate on %s returned %s", id, truncID)
	}
}

func TestShortenIdInvalid(t *testing.T) {
	id := "1234"
	truncID := TruncateID(id)
	if len(truncID) != len(id) {
		t.Fatalf("Id returned is incorrect: truncate on %s returned %s", id, truncID)
	}
}

func TestGenerateRandomID(t *testing.T) {
	id := GenerateRandomID()

	if len(id) != 64 {
		t.Fatalf("Id returned is incorrect: %s", id)
	}
}

func TestRandomString(t *testing.T) {
	id := RandomString()
	if len(id) != 64 {
		t.Fatalf("Id returned is incorrect: %s", id)
	}
}

func TestRandomStringUniqueness(t *testing.T) {
	repeats := 25
	set := make(map[string]struct{}, repeats)
	for i := 0; i < repeats; i = i + 1 {
		id := RandomString()
		if len(id) != 64 {
			t.Fatalf("Id returned is incorrect: %s", id)
		}
		if _, ok := set[id]; ok {
			t.Fatalf("Random number is repeated")
		}
		set[id] = struct{}{}
	}
}