// Copyright 2026 tamakyi. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package cache

import (
	"sync"
	"testing"
	"time"
)

func TestTTLCacheBasic(t *testing.T) {
	c := NewTTLCache(8)
	if _, ok := c.Get("missing"); ok {
		t.Fatal("expected miss for empty cache")
	}
	c.Set("k", "v", time.Minute)
	v, ok := c.Get("k")
	if !ok || v.(string) != "v" {
		t.Fatalf("expected hit with v, got %v %v", v, ok)
	}
}

func TestTTLCacheExpiry(t *testing.T) {
	c := NewTTLCache(8)
	c.Set("k", "v", time.Nanosecond)
	time.Sleep(2 * time.Millisecond)
	if _, ok := c.Get("k"); ok {
		t.Fatal("expected expired entry to miss")
	}
}

func TestTTLCacheCapacityEviction(t *testing.T) {
	c := NewTTLCache(4)
	for i := 0; i < 100; i++ {
		c.Set(string(rune('a'+i%26))+string(rune('0'+i%10)), i, time.Minute)
	}
	// 不 panic 且仍可读
	if _, ok := c.Get("a0"); ok {
		// 命中与否均可，关键是内存不失控且无 panic
		_ = ok
	}
}

func TestTTLCacheConcurrent(t *testing.T) {
	c := NewTTLCache(16)
	var wg sync.WaitGroup
	for g := 0; g < 20; g++ {
		wg.Add(1)
		go func(n int) {
			defer wg.Done()
			for i := 0; i < 200; i++ {
				key := string(rune('a' + (n+i)%26))
				c.Set(key, n, time.Minute)
				c.Get(key)
			}
		}(g)
	}
	wg.Wait()
}