package entity

import (
	"math"
	"testing"
)

func TestDefaultSparkID(t *testing.T) {
	a := DefaultSparkID(100)
	b := DefaultSparkID(101)
	if a == b || a[0] != 's' || !ValidSparkID(a) || !ValidSparkID(b) {
		t.Fatalf("%s %s", a, b)
	}
	if len(a) != 1+sparkIDBodyLen || len(a) > SparkIDMax || len(a) < SparkIDMin {
		t.Fatalf("len %s", a)
	}
	if DefaultSparkID(100) != a {
		t.Fatal("not deterministic")
	}
	if DefaultSparkID(math.MaxInt64) == a || !ValidSparkID(DefaultSparkID(math.MaxInt64)) {
		t.Fatal("max int64")
	}
	seen := map[string]int64{}
	for id := int64(0); id < 4000; id++ {
		s := DefaultSparkID(id)
		if !ValidSparkID(s) {
			t.Fatalf("invalid %d %s", id, s)
		}
		if other, ok := seen[s]; ok {
			t.Fatalf("collision %d %d %s", other, id, s)
		}
		seen[s] = id
	}
	if ValidSparkID("1abcdef") || ValidSparkID("abcdefg") || ValidSparkID("abcdefghijklmnopq") {
		t.Fatal("spark_id rules")
	}
}