// Kyoo - A portable and vast media library solution.
// Copyright (c) Kyoo.
//
// See AUTHORS.md and LICENSE file in the project root for full license information.
//
// Kyoo is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// Kyoo is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Kyoo. If not, see <https://www.gnu.org/licenses/>.

using System;
using System.Collections.Generic;
using System.Linq;
using Kyoo.Abstractions.Controllers;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

namespace Kyoo.Host.Controllers;

/// <summary>
/// An implementation of <see cref="IPluginManager"/>.
/// This is used to load plugins and retrieve information from them.
/// </summary>
public class PluginManager : IPluginManager
{
	/// <summary>
	/// The service provider. It allow plugin's activation.
	/// </summary>
	private readonly IServiceProvider _provider;

	/// <summary>
	/// The logger used by this class.
	/// </summary>
	private readonly ILogger<PluginManager> _logger;

	/// <summary>
	/// The list of plugins that are currently loaded.
	/// </summary>
	private readonly List<IPlugin> _plugins = new();

	/// <summary>
	/// Create a new <see cref="PluginManager"/> instance.
	/// </summary>
	/// <param name="provider">A service container to allow initialization of plugins</param>
	/// <param name="logger">The logger used by this class.</param>
	public PluginManager(IServiceProvider provider, ILogger<PluginManager> logger)
	{
		_provider = provider;
		_logger = logger;
	}

	/// <inheritdoc />
	public T GetPlugin<T>(string name)
	{
		return (T)_plugins?.FirstOrDefault(x => x.Name == name && x is T);
	}

	/// <inheritdoc />
	public ICollection<T> GetPlugins<T>()
	{
		return _plugins?.OfType<T>().ToArray();
	}

	/// <inheritdoc />
	public ICollection<IPlugin> GetAllPlugins()
	{
		return _plugins;
	}

	/// <inheritdoc />
	public void LoadPlugins(ICollection<IPlugin> plugins)
	{
		_plugins.AddRange(plugins);
		_logger.LogInformation("Modules enabled: {Plugins}", _plugins.Select(x => x.Name));
	}

	/// <inheritdoc />
	public void LoadPlugins(params Type[] plugins)
	{
		LoadPlugins(
			plugins.Select(x => (IPlugin)ActivatorUtilities.CreateInstance(_provider, x)).ToArray()
		);
	}
}