using System;
using System.Linq;
using System.Windows.Forms;

using BizHawk.Client.Common;
using BizHawk.Emulation.Cores.Computers.SinclairSpectrum;

namespace BizHawk.Client.EmuHawk
{
	public partial class ZXSpectrumJoystickSettings : Form
	{
		private ZXSpectrum.ZXSpectrumSyncSettings _syncSettings;

		public ZXSpectrumJoystickSettings()
		{
			InitializeComponent();
		}

        private string[] possibleControllers;

		private void IntvControllerSettings_Load(object sender, EventArgs e)
		{
			_syncSettings = ((ZXSpectrum)Global.Emulator).GetSyncSettings().Clone();

            possibleControllers = Enum.GetNames(typeof(JoystickType));

			foreach (var val in possibleControllers)
			{
				Port1ComboBox.Items.Add(val);
				Port2ComboBox.Items.Add(val);
                Port3ComboBox.Items.Add(val);
            }

			Port1ComboBox.SelectedItem = _syncSettings.JoystickType1.ToString();
			Port2ComboBox.SelectedItem = _syncSettings.JoystickType2.ToString();
            Port3ComboBox.SelectedItem = _syncSettings.JoystickType3.ToString();
        }

		private void OkBtn_Click(object sender, EventArgs e)
		{
			bool changed =
				_syncSettings.JoystickType1.ToString() != Port1ComboBox.SelectedItem.ToString()
				|| _syncSettings.JoystickType2.ToString() != Port2ComboBox.SelectedItem.ToString()
                || _syncSettings.JoystickType3.ToString() != Port3ComboBox.SelectedItem.ToString();

            if (changed)
			{
                // enforce unique joystick selection

                bool selectionValid = true;

                var j1 = Port1ComboBox.SelectedItem.ToString();
                if (j1 != possibleControllers.First())
                {
                    if (j1 == Port2ComboBox.SelectedItem.ToString())
                    {
                        Port2ComboBox.SelectedItem = possibleControllers.First();
                        selectionValid = false;
                    }
                    if (j1 == Port3ComboBox.SelectedItem.ToString())
                    {
                        Port3ComboBox.SelectedItem = possibleControllers.First();
                        selectionValid = false;
                    }
                }

                var j2 = Port2ComboBox.SelectedItem.ToString();
                if (j2 != possibleControllers.First())
                {
                    if (j2 == Port1ComboBox.SelectedItem.ToString())
                    {
                        Port1ComboBox.SelectedItem = possibleControllers.First();
                        selectionValid = false;
                    }
                    if (j2 == Port3ComboBox.SelectedItem.ToString())
                    {
                        Port3ComboBox.SelectedItem = possibleControllers.First();
                        selectionValid = false;
                    }
                }   

                var j3 = Port3ComboBox.SelectedItem.ToString();
                if (j3 != possibleControllers.First())
                {
                    if (j3 == Port1ComboBox.SelectedItem.ToString())
                    {
                        Port1ComboBox.SelectedItem = possibleControllers.First();
                        selectionValid = false;
                    }
                    if (j3 == Port2ComboBox.SelectedItem.ToString())
                    {
                        Port2ComboBox.SelectedItem = possibleControllers.First();
                        selectionValid = false;
                    }
                }

                if (selectionValid)
                {
                    _syncSettings.JoystickType1 = (JoystickType)Enum.Parse(typeof(JoystickType), Port1ComboBox.SelectedItem.ToString());
                    _syncSettings.JoystickType2 = (JoystickType)Enum.Parse(typeof(JoystickType), Port2ComboBox.SelectedItem.ToString());
                    _syncSettings.JoystickType3 = (JoystickType)Enum.Parse(typeof(JoystickType), Port3ComboBox.SelectedItem.ToString());

                    GlobalWin.MainForm.PutCoreSyncSettings(_syncSettings);

                    DialogResult = DialogResult.OK;
                    Close();
                }
                else
                {
                    MessageBox.Show("Invalid joystick configuration. \nDuplicates have automatically been changed to NULL.\n\nPlease review the configuration");
                }
			}
            else
            {
                DialogResult = DialogResult.OK;
                Close();
            }
		}

		private void CancelBtn_Click(object sender, EventArgs e)
		{
			GlobalWin.OSD.AddMessage("Joystick settings aborted");
			DialogResult = DialogResult.Cancel;
			Close();
		}
	}
}