package monitor

import "testing"

func TestRecentTracker_AddOrder(t *testing.T) {
	rt := NewRecentTracker()
	rt.Add("a.txt", "docs")
	rt.Add("b.txt", "docs")

	files := rt.Files()
	if len(files) != 2 {
		t.Fatalf("expected 2 files, got %d", len(files))
	}
	if files[0].Name != "b.txt" {
		t.Errorf("most recent should be first, got %s", files[0].Name)
	}
	if files[1].Name != "a.txt" {
		t.Errorf("oldest should be last, got %s", files[1].Name)
	}
}

func TestRecentTracker_RingBufferOverflow(t *testing.T) {
	rt := NewRecentTracker()
	for i := 0; i < 15; i++ {
		rt.Add("file", "f")
	}
	files := rt.Files()
	if len(files) != maxRecentFiles {
		t.Errorf("expected %d files after overflow, got %d", maxRecentFiles, len(files))
	}
}

func TestRecentTracker_FilesCopy(t *testing.T) {
	rt := NewRecentTracker()
	rt.Add("a.txt", "docs")

	files := rt.Files()
	files[0].Name = "mutated"

	original := rt.Files()
	if original[0].Name != "a.txt" {
		t.Error("Files() should return a copy, but internal state was mutated")
	}
}