package ratelimit_test

import (
	"testing"
	"time"

	"scrabble/gateway/internal/ratelimit"
)

func TestAllowEnforcesBurst(t *testing.T) {
	l := ratelimit.New()
	p := ratelimit.PerMinute(60, 3) // 1/s, burst 3
	allowed := 0
	for i := 0; i < 5; i++ {
		if l.Allow("ip:1.2.3.4", p) {
			allowed++
		}
	}
	if allowed != 3 {
		t.Fatalf("allowed %d of 5, want 3 (burst)", allowed)
	}
}

func TestAllowIsolatesKeys(t *testing.T) {
	l := ratelimit.New()
	p := ratelimit.PerMinute(60, 1)
	if !l.Allow("user:a", p) {
		t.Fatal("first key should be allowed")
	}
	if !l.Allow("user:b", p) {
		t.Fatal("a different key must have its own bucket")
	}
	if l.Allow("user:a", p) {
		t.Fatal("the first key's bucket should now be empty")
	}
}

func TestPerWindow(t *testing.T) {
	// 5 events per 10 minutes, burst 2: the third immediate call is denied.
	p := ratelimit.Per(5, 10*time.Minute, 2)
	l := ratelimit.New()
	got := []bool{l.Allow("email:x", p), l.Allow("email:x", p), l.Allow("email:x", p)}
	if !got[0] || !got[1] || got[2] {
		t.Fatalf("per-window burst = %v, want [true true false]", got)
	}
}