using BotPages.Core.Abstractions;
using BotPages.Core.Messaging;

namespace BotPages.Telegram;

/// <summary>
/// Расширения для `MessageBuilder` специфичные для Telegram.
/// Позволяют удобно задать `TelegramOptions` для конкретного сообщения
/// без изменения самого билдера.
/// </summary>
public static class MessageBuilderExtensions
{
    /// <summary>
    /// Установить опции Telegram для конкретного сообщения (переопределяют опции адаптера).
    /// </summary>
    public static MessageBuilder WithTelegramOptions(this MessageBuilder builder, TelegramOptions options)
    {
        // Ensure bag exists
        var bag = (builder as object) switch
        {
            MessageBuilder mb => GetAdapterBag(mb) ?? CreateAndSetAdapterBag(mb),
            _ => null
        };

        bag?.Set("telegram", options);
        return builder;
    }

    // Reflection helpers to access private adapterOptions field on MessageBuilder
    private static AdapterOptionsBag? GetAdapterBag(MessageBuilder builder)
    {
        var fi = typeof(MessageBuilder).GetField("_adapterOptions", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
        return fi?.GetValue(builder) as AdapterOptionsBag;
    }

    private static AdapterOptionsBag CreateAndSetAdapterBag(MessageBuilder builder)
    {
        var fi = typeof(MessageBuilder).GetField("_adapterOptions", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
        var bag = new AdapterOptionsBag();
        fi?.SetValue(builder, bag);
        return bag;
    }
}