using System;
using System.IO;
using Jellyfin.Plugin.RecentlyAddedGuard.Core;
using Jellyfin.Plugin.RecentlyAddedGuard.Ledger;
using Jellyfin.Plugin.RecentlyAddedGuard.Services;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Controller;
using MediaBrowser.Controller.Plugins;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

namespace Jellyfin.Plugin.RecentlyAddedGuard;

/// <summary>
/// Registers the plugin services with Jellyfin's DI container.
/// </summary>
public class PluginServiceRegistrator : IPluginServiceRegistrator
{
    /// <inheritdoc />
    public void RegisterServices(IServiceCollection serviceCollection, IServerApplicationHost applicationHost)
    {
        // Runs before the plugin instance exists; factories are evaluated later, when the host starts.
        serviceCollection.AddSingleton<CorrectionLog>();
        serviceCollection.AddSingleton(sp => new LedgerStore(
            Path.Combine(GetDataFolderPath(sp), LedgerStore.DefaultFileName),
            sp.GetRequiredService<ILogger<LedgerStore>>()));
        serviceCollection.AddSingleton(sp => new Reconciler(
            sp.GetRequiredService<LedgerStore>(),
            GetOptions,
            TimeProvider.System,
            sp.GetRequiredService<ILogger<Reconciler>>()));
        serviceCollection.AddSingleton<IdentityResolver>();
        serviceCollection.AddSingleton<LibraryItemDateWriter>();
        serviceCollection.AddSingleton(sp => new GuardProcessor(
            sp.GetRequiredService<Reconciler>(),
            sp.GetRequiredService<LibraryItemDateWriter>(),
            sp.GetRequiredService<CorrectionLog>(),
            GetOptions,
            TimeProvider.System,
            sp.GetRequiredService<ILogger<GuardProcessor>>()));
        serviceCollection.AddSingleton<LedgerSynchronizer>();
        serviceCollection.AddHostedService<GuardHostedService>();
    }

    private static GuardOptions GetOptions() => Plugin.CurrentConfiguration.ToGuardOptions();

    private static string GetDataFolderPath(IServiceProvider serviceProvider)
        => Plugin.Instance?.DataFolderPath
            ?? Path.Combine(serviceProvider.GetRequiredService<IApplicationPaths>().PluginsPath, typeof(Plugin).Assembly.GetName().Name!);
}