// steamcache/steamcache_test.go
package steamcache

import (
	"io"
	"os"
	"path/filepath"
	"testing"
)

func TestCaching(t *testing.T) {
	td := t.TempDir()

	os.WriteFile(filepath.Join(td, "key2"), []byte("value2"), 0644)

	sc := New("localhost:8080", "1G", 10, "1G", 100, td, "")

	w, err := sc.vfs.Create("key", 5)
	if err != nil {
		t.Errorf("Create failed: %v", err)
	}
	w.Write([]byte("value"))
	w.Close()

	w, err = sc.vfs.Create("key1", 6)
	if err != nil {
		t.Errorf("Create failed: %v", err)
	}
	w.Write([]byte("value1"))
	w.Close()

	if sc.diskgc.Size() != 17 {
		t.Errorf("Size failed: got %d, want %d", sc.diskgc.Size(), 17)
	}

	if sc.vfs.Size() != 17 {
		t.Errorf("Size failed: got %d, want %d", sc.vfs.Size(), 17)
	}

	rc, err := sc.vfs.Open("key")
	if err != nil {
		t.Errorf("Open failed: %v", err)
	}
	d, _ := io.ReadAll(rc)
	rc.Close()
	if string(d) != "value" {
		t.Errorf("Get failed: got %s, want %s", d, "value")
	}

	rc, err = sc.vfs.Open("key1")
	if err != nil {
		t.Errorf("Open failed: %v", err)
	}
	d, _ = io.ReadAll(rc)
	rc.Close()
	if string(d) != "value1" {
		t.Errorf("Get failed: got %s, want %s", d, "value1")
	}

	rc, err = sc.vfs.Open("key2")
	if err != nil {
		t.Errorf("Open failed: %v", err)
	}
	d, _ = io.ReadAll(rc)
	rc.Close()
	if string(d) != "value2" {
		t.Errorf("Get failed: got %s, want %s", d, "value2")
	}

	if sc.diskgc.Size() != 17 {
		t.Errorf("Size failed: got %d, want %d", sc.diskgc.Size(), 17)
	}

	if sc.vfs.Size() != 17 {
		t.Errorf("Size failed: got %d, want %d", sc.vfs.Size(), 17)
	}

	sc.memory.Delete("key2")
	os.Remove(filepath.Join(td, "key2"))

	if _, err := sc.vfs.Open("key2"); err == nil {
		t.Errorf("Open failed: got nil, want error")
	}
}

func TestCacheMissAndHit(t *testing.T) {
	sc := New("localhost:8080", "0", 0, "1G", 100, t.TempDir(), "")

	key := "testkey"
	value := []byte("testvalue")

	// Simulate miss: but since no upstream, skip full ServeHTTP, test VFS
	w, err := sc.vfs.Create(key, int64(len(value)))
	if err != nil {
		t.Fatal(err)
	}
	w.Write(value)
	w.Close()

	rc, err := sc.vfs.Open(key)
	if err != nil {
		t.Fatal(err)
	}
	got, _ := io.ReadAll(rc)
	rc.Close()

	if string(got) != string(value) {
		t.Errorf("expected %s, got %s", value, got)
	}
}