using System;
using System.Collections.Generic;

namespace Svrnty.CQRS.Configuration;

/// <summary>
/// Configuration for CQRS services and endpoints.
/// Supports extension by third-party packages through generic configuration storage.
/// </summary>
public class CqrsConfiguration
{
    private readonly Dictionary<Type, object> _configurations = new();
    private readonly List<Action<object>> _mappingCallbacks = new();

    /// <summary>
    /// Sets a configuration object for a specific type
    /// </summary>
    public void SetConfiguration<T>(T config) where T : class
    {
        _configurations[typeof(T)] = config;
    }

    /// <summary>
    /// Gets a configuration object for a specific type
    /// </summary>
    public T? GetConfiguration<T>() where T : class
    {
        return _configurations.TryGetValue(typeof(T), out var config) ? config as T : null;
    }

    /// <summary>
    /// Checks if a configuration exists for a specific type
    /// </summary>
    public bool HasConfiguration<T>() where T : class
    {
        return _configurations.ContainsKey(typeof(T));
    }

    /// <summary>
    /// Registers a callback to be executed during endpoint mapping.
    /// Used by extension packages to register their endpoint mapping logic.
    /// </summary>
    /// <param name="callback">Callback that accepts an application builder (typically WebApplication)</param>
    public void AddMappingCallback(Action<object> callback)
    {
        _mappingCallbacks.Add(callback);
    }

    /// <summary>
    /// Executes all registered mapping callbacks.
    /// Called by UseSvrntyCqrs() to map endpoints from all configured packages.
    /// </summary>
    /// <param name="app">The application builder (typically WebApplication)</param>
    public void ExecuteMappingCallbacks(object app)
    {
        foreach (var callback in _mappingCallbacks)
        {
            callback(app);
        }
    }
}