package cache_test

import (
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"forge.lclr.dev/AI/xdebug-mcp/internal/cache"
	"forge.lclr.dev/AI/xdebug-mcp/internal/cachegrind"
)

func TestLRU_GetSet(t *testing.T) {
	c := cache.New(2)
	t0 := time.Now()
	p := &cachegrind.Profile{Cmd: "p1"}

	c.Set("/a", p, t0)
	got, ok := c.Get("/a", t0)
	require.True(t, ok)
	assert.Equal(t, p, got)
}

func TestLRU_Eviction(t *testing.T) {
	c := cache.New(2)
	t0 := time.Now()

	p1 := &cachegrind.Profile{Cmd: "p1"}
	p2 := &cachegrind.Profile{Cmd: "p2"}
	p3 := &cachegrind.Profile{Cmd: "p3"}

	c.Set("/a", p1, t0)
	c.Set("/b", p2, t0)
	c.Get("/a", t0) // access /a → /b becomes LRU
	c.Set("/c", p3, t0) // should evict /b

	_, ok := c.Get("/b", t0)
	assert.False(t, ok, "b should have been evicted")

	got, ok := c.Get("/a", t0)
	require.True(t, ok)
	assert.Equal(t, p1, got)

	got, ok = c.Get("/c", t0)
	require.True(t, ok)
	assert.Equal(t, p3, got)
}

func TestLRU_ModtimeInvalidation(t *testing.T) {
	c := cache.New(2)
	t1 := time.Now()
	t2 := t1.Add(time.Second)

	c.Set("/a", &cachegrind.Profile{Cmd: "old"}, t1)
	_, ok := c.Get("/a", t2) // newer modtime → stale
	assert.False(t, ok)
}