using TMPro;
using UnityEngine;
using VMdemo.Simulation;

namespace VMdemo.UI
{
    public class SimulationTablesView : MonoBehaviour
    {
        [SerializeField] private TMP_Text tlbText;
        [SerializeField] private TMP_Text pageTableText;
        [SerializeField] private TMP_Text fifoText;

        public void ShowNotInitialized()
        {
            SetText(tlbText, "TLB：N/A");
            SetText(pageTableText, "页表：N/A");
            SetText(fifoText, "FIFO：N/A");
        }

        public void Render(TranslatorEngine engine)
        {
            if (engine == null)
            {
                ShowNotInitialized();
                return;
            }

            var vpnBits = engine.VaBits - engine.OffsetBits;
            var pfnBits = SimulationUIFormatter.ComputeBitsForCount(engine.PhysicalMemoryManager.FrameCount);
            SetText(
                tlbText,
                SimulationUIFormatter.FormatTlbTable(
                    engine.TlbCache.GetEntriesMostRecentFirst(),
                    vpnBits,
                    pfnBits));
            SetText(pageTableText, SimulationUIFormatter.FormatCurrentPageTableEntry(engine.State, engine.PageTable, engine.LastEviction));
            SetText(fifoText, SimulationUIFormatter.FormatFifoQueue(engine.PhysicalMemoryManager.GetFifoVpnOrder()));
        }

        private static void SetText(TMP_Text target, string value)
        {
            if (target != null)
            {
                target.text = value;
            }
        }
    }
}