using Gtk;

namespace Pilz.Plugins.Advanced.UI.Gtk;

public static class Extensions
{
    private class PluginFunctionEventArgs(EventArgs original, PluginFunction function) : EventArgs
    {
        public EventArgs Original { get; } = original;
        public PluginFunction Function { get; } = function;
    }

    private class PluginModuleEventArgs(EventArgs original, PluginModuleBase function) : EventArgs
    {
        public EventArgs Original { get; } = original;
        public PluginModuleBase Function { get; } = function;
    }

    public static MenuItem GetAsItem(this PluginModuleBase module)
    {
        return module.GetAsItem(true);
    }

    public static MenuItem GetAsItem(this PluginModuleBase module, bool addDefaultHandler)
    {
        return module.GetAsItem(addDefaultHandler ? (sender, e) => RadMenuItem_RMMethod_Click(sender, new PluginModuleEventArgs(e, module)) : null);
    }

    public static MenuItem GetAsItem(this PluginFunction function)
    {
        return function.GetAsItem(true);
    }

    public static MenuItem GetAsItem(this PluginFunction function, bool addDefaultHandler)
    {
        return function.GetAsItem(addDefaultHandler ? (sender, e) => RadMenuItem_RMFunction_Click(sender, new PluginFunctionEventArgs(e, function)) : null);
    }

    public static MenuItem GetAsItem(this PluginFeature module, EventHandler? clickHandler)
    {
        var item = new MenuItem(module.Name)
        {
            Visible = module.Enabled,
            TooltipText = module.Description ?? module.Name
        };

        if (clickHandler is not null)
            item.Activated += clickHandler;

        return item;
    }

    /// <summary>
    /// Inserts all items to a menu item.
    /// </summary>
    /// <param name="parentMenuItem"></param>
    /// <param name="features"></param>
    /// <param name="addDefaultHandler">Will add a default click handler that executes the feature.<br/>
    /// You usually don't set customClickHandler if you set this parameter to true.</param>
    /// <param name="customClickHandler">Adds a custom click handler. If addDefaultHandler is true, it will only work on <see cref="PluginFeature"/>s.<br/>
    /// You usually don't set addDefaultHandler to true if you set this parameter to something not null.</param>
    /// <param name="customDefault">Defines a custom default position (index).</param>
    /// <param name="customTop">Defines a custom top position (index).</param>
    /// <param name="customBottom">Defines a custom bottom position (index).</param>
    /// <param name="insertPrioSplitters">Defines if splitters should be inserted to seperate the new items by priorization.</param>
    public static IEnumerable<KeyValuePair<MenuItem, PluginFeature>> InsertItemsTo(this IEnumerable<PluginFeature> features,
        MenuItem parentMenuItem,
        bool addDefaultHandler = false,
        EventHandler? customClickHandler = null,
        int? customDefault = null,
        int? customTop = null,
        int? customBottom = null,
        bool insertPrioSplitters = false)
    {
        var insertedItems = new List<KeyValuePair<MenuItem, PluginFeature>>();
        FeaturePrioritization? prevPrio = null;

        // Oder by priorization
        features = features.OrderByDescending(n => n.Prioritization);

        foreach (var feature in features)
        {
            MenuItem item;

            if (feature is PluginFunction function)
                item = function.GetAsItem(addDefaultHandler);
            else if (feature is PluginModuleBase module)
                item = module.GetAsItem(addDefaultHandler);
            else
                item = feature.GetAsItem(null);

            if (!addDefaultHandler && customClickHandler != null)
                item.Activated += customClickHandler;

            if (insertPrioSplitters && (prevPrio == null || prevPrio > feature.Prioritization))
            {
                insertItem(new SeparatorMenuItem());
                prevPrio = feature.Prioritization;
            }

            insertItem(item);

            void insertItem(MenuItem item)
            {
                if (parentMenuItem.Submenu is Menu subMenu)
                    subMenu.Append(item);
            }

            if (item.Parent != null)
                insertedItems.Add(new(item, feature));
        }

        return insertedItems;
    }

    private static void RadMenuItem_RMMethod_Click(object? sender, EventArgs e)
    {
        if (sender is MenuItem item && item.Sensitive && e is PluginFunctionEventArgs args && args.Function.Enabled)
            throw new NotImplementedException();
    }

    private static void RadMenuItem_RMFunction_Click(object? sender, EventArgs e)
    {
        if (sender is MenuItem item && item.Sensitive && e is PluginFunctionEventArgs args && args.Function.Enabled)
            args.Function.Execute();
    }
}