using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Mesen.GUI.Controls;
using Mesen.GUI.Forms;

namespace Mesen.GUI.Debugger.Controls
{
	public partial class ctrlCpuStatus : BaseControl
	{
		private EntityBinder _cpuBinder = new EntityBinder();
		private CpuState _lastState;

		public ctrlCpuStatus()
		{
			InitializeComponent();
			if(IsDesignMode) {
				return;
			}

			_cpuBinder.Entity = new CpuState();
			_cpuBinder.AddBinding(nameof(CpuState.A), txtA);
			_cpuBinder.AddBinding(nameof(CpuState.X), txtX);
			_cpuBinder.AddBinding(nameof(CpuState.Y), txtY);
			_cpuBinder.AddBinding(nameof(CpuState.D), txtD);
			_cpuBinder.AddBinding(nameof(CpuState.DBR), txtDB);
			_cpuBinder.AddBinding(nameof(CpuState.SP), txtS);
			_cpuBinder.AddBinding(nameof(CpuState.PS), txtP);

			_cpuBinder.AddBinding(nameof(CpuState.NmiFlag), chkNmi);
		}

		public void UpdateStatus(CpuState state)
		{
			_lastState = state;

			_cpuBinder.Entity = state;
			_cpuBinder.UpdateUI();

			txtPC.Text = ((state.K << 16) | state.PC).ToString("X6");

			UpdateCpuFlags();

			chkIrq.Checked = state.IrqSource != 0;
			UpdateStack();
		}

		private void UpdateCpuFlags()
		{
			ProcFlags flags = _lastState.PS;
			chkIndex.Checked = flags.HasFlag(ProcFlags.IndexMode8);
			chkCarry.Checked = flags.HasFlag(ProcFlags.Carry);
			chkDecimal.Checked = flags.HasFlag(ProcFlags.Decimal);
			chkInterrupt.Checked = flags.HasFlag(ProcFlags.IrqDisable);
			chkNegative.Checked = flags.HasFlag(ProcFlags.Negative);
			chkOverflow.Checked = flags.HasFlag(ProcFlags.Overflow);
			chkMemory.Checked = flags.HasFlag(ProcFlags.MemoryMode8);
			chkZero.Checked = flags.HasFlag(ProcFlags.Zero);
		}

		private void UpdateStack()
		{
			StringBuilder sb = new StringBuilder();
			for(UInt32 i = (uint)_lastState.SP + 1; (i & 0xFF) != 0; i++) {
				sb.Append("$");
				sb.Append(DebugApi.GetMemoryValue(SnesMemoryType.CpuMemory, i).ToString("X2"));
				sb.Append(", ");
			}
			string stack = sb.ToString();
			if(stack.Length > 2) {
				stack = stack.Substring(0, stack.Length - 2);
			}
			txtStack.Text = stack;
		}
	}
}