using System;
using System.Linq;
using System.Collections.Generic;
using UnityEngine;
using UVC.UI.Util;

namespace EnglewoodLAB.UI
{
    public class MenuSelectionController : MonoBehaviour
    {
        private class MenuItemEntry
        {
            public TextColorChangeBehaviour ColorChanger;
            public System.Type PanelType;
        }

        private readonly List<MenuItemEntry> _menuItems = new List<MenuItemEntry>();
        private MenuItemEntry _currentSelectedEntry;

        public void RegisterButton(TextColorChangeBehaviour colorChanger, System.Type panelType)
        {
            var entry = new MenuItemEntry { ColorChanger = colorChanger, PanelType = panelType };
            if (colorChanger != null)
            {
                _menuItems.Add(entry);
            }
        }

        // Handles deselecting the button color, but NOT closing the panel
        private void DeselectCurrentButtonColorOnly()
        {
            if (_currentSelectedEntry != null)
            {
                _currentSelectedEntry.ColorChanger.SetSelected(false);
                _currentSelectedEntry = null;
            }
        }

        public void OnButtonSelected(TextColorChangeBehaviour selectedColorChanger)
        {
            var selectedEntry = _menuItems.FirstOrDefault(e => e.ColorChanger == selectedColorChanger);
            if (selectedEntry == null) return;

            if (selectedEntry == _currentSelectedEntry)
            {
                // User clicked the same button again: Deselect it and close the panel.
                if (_currentSelectedEntry.PanelType != null)
                {
                    var panelToClose = FindObjectOfType(_currentSelectedEntry.PanelType, true) as UIPanel;
                    panelToClose?.Close(); // Close the panel
                }
                DeselectCurrentButtonColorOnly(); // Deselect the button color
            }
            else
            {
                // Deselect the old button and close its panel (if one was selected)
                if (_currentSelectedEntry != null)
                {
                    if (_currentSelectedEntry.PanelType != null)
                    {
                        var panelToClose = FindObjectOfType(_currentSelectedEntry.PanelType, true) as UIPanel;
                        panelToClose?.Close(); // Close the old panel
                    }
                    DeselectCurrentButtonColorOnly(); // Deselect old button color
                }

                // Select the new button
                selectedEntry.ColorChanger.SetSelected(true);
                _currentSelectedEntry = selectedEntry;

                // Panel open logic is assumed to be handled by the original ICommand execution
                // No explicit call to Open() from here, as command already handles it.
            }
        }

        // For external closing of a specific panel (e.g. TotalProgressPanel's close button)
        public void NotifyPanelClosed(System.Type panelType)
        {
            if (_currentSelectedEntry != null && _currentSelectedEntry.PanelType == panelType)
            {
                DeselectCurrentButtonColorOnly(); // Deselect the button color if it was associated with the closed panel
            }
        }

        // For external closing of any panel (e.g. a global close event)
        public void NotifyAnyPanelClosed()
        {
            // If we don't know *which* panel closed, we have to assume the current one.
            DeselectCurrentButtonColorOnly();
        }

        public void SetInitialSelection(TextColorChangeBehaviour initialButton)
        {
            var initialEntry = _menuItems.FirstOrDefault(e => e.ColorChanger == initialButton);
            if (initialEntry != null)
            {
                // Select the new button
                initialEntry.ColorChanger.SetSelected(true);
                _currentSelectedEntry = initialEntry;
            }
        }

        //internal void RegisterButton(UVC.UI.Util.TextColorChangeBehaviour colorChanger, Type panelType)
        //{
        //    throw new NotImplementedException();
        //}

        //internal void OnButtonSelected(UVC.UI.Util.TextColorChangeBehaviour colorChanger)
        //{
        //    throw new NotImplementedException();
        //}

        internal void RegisterButton(UVC.UI.Util.ImageColorChangeBehaviour colorChanger, Type panelType)
        {
            throw new NotImplementedException();
        }

        internal void OnButtonSelected(UVC.UI.Util.ImageColorChangeBehaviour colorChanger)
        {
            throw new NotImplementedException();
        }
    }
}