using PCC2.AssemblyInject.Interfaces;

namespace PCC2.AssemblyInject.Services;

internal class AssemblyInjectStartStopWorker<T> : IHostedService
{
    private readonly ILogger<AssemblyInjectStartStopWorker<T>> _logger;
    private readonly IReadOnlyCollection<IAssemblyInjectSyncInitStarStop> _syncServices;
    private readonly IReadOnlyCollection<IAssemblyInjectASyncInitStarStop> _asyncServices;

    public AssemblyInjectStartStopWorker(
        IServiceProvider serviceProvider,
        ILogger<AssemblyInjectStartStopWorker<T>> logger)
    {
        _logger = logger;

        _logger.LogInformation("Activating Singleton Component...");

        //单例组件
        var serviceTypes = new HashSet<Type>();
        foreach (var svcType in typeof(T).Assembly.GetTypes()
                     .Where(typeof(IAssemblyInjectSingleton).IsAssignableFrom)
                     .Where(p => p.IsInterface == false && p.IsAbstract == false)
                     .OrderBy(p => p.Name))
        {
            var gsi = svcType.GetInterfaces().Where(p => p.IsGenericType && p.GetGenericTypeDefinition() == typeof(IAssemblyInjectSingleton<>)).ToArray();

            foreach (var type in gsi)
            {
                var addAs = type.GetGenericArguments().First();
                serviceTypes.Add(addAs);
            }
        }

        foreach (var serviceType in serviceTypes)
        {
            var services = serviceProvider.GetServices(serviceType).ToArray();
            for (var i = 0; i < services.Length; i++)
            {
                var service = services[i];
                if (service != null) _logger.LogInformation($"Singleton Component Active {service.GetType().FullName}");
                else logger.LogWarning($"Encounter null in Active {serviceType.FullName}#{i}");
            }
        }

        foreach (var type in typeof(T).Assembly.GetTypes()
                     .Where(type => typeof(IAssemblyInjectSingleton).IsAssignableFrom(type) && !typeof(IAssemblyInjectSingleton<>).IsAssignableFrom(type))
                     .Where(p => p.IsInterface == false && p.IsAbstract == false)
                     .OrderBy(p => p.Name))
        {
            var service = serviceProvider.GetService(type);
            if (service != null)
            {
                _logger.LogInformation($"Singleton Component Active {service.GetType().FullName}");
            }
        }

        _syncServices = typeof(T).Assembly.GetTypes()
            .Where(typeof(IAssemblyInjectSyncInitStarStop).IsAssignableFrom)
            .Where(p => p.IsInterface == false && p.IsAbstract == false)
            .OrderBy(p => p.Name)
            .SelectMany(p =>
            {
                var gsi = p.GetInterfaces().Where(i => i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IAssemblyInjectSyncInitStarStop<>)).ToArray();
                return gsi.Length == 0 ? [p] : gsi.Select(gi => gi.GetGenericArguments().First());
            })
            .Distinct()
            .Select(type => (type, serviceProvider.GetService(type)))
            .Where(p =>
            {
                if (p.Item2 == null)
                {
                    logger.LogWarning($"Encounter null in IAssemblyInjectSyncInitStarStop: {p.type.FullName}");
                    return false;
                }
                return true;
            }).Select(p => p.Item2)
            .Cast<IAssemblyInjectSyncInitStarStop>()
            .ToArray();

        _asyncServices = typeof(T).Assembly.GetTypes()
            .Where(typeof(IAssemblyInjectASyncInitStarStop).IsAssignableFrom)
            .Where(p => p.IsInterface == false && p.IsAbstract == false)
            .OrderBy(p => p.Name)
            .SelectMany(p =>
            {
                var gsi = p.GetInterfaces().Where(i => i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IAssemblyInjectASyncInitStarStop<>)).ToArray();
                return gsi.Length == 0 ? [p] : gsi.Select(gi => gi.GetGenericArguments().First());
            })
            .Distinct()
            .Select(type => (type, serviceProvider.GetService(type)))
            .Where(p =>
            {
                if (p.Item2 == null)
                {
                    logger.LogWarning($"Encounter null in IAssemblyInjectASyncInitStarStop: {p.type.FullName}");
                    return false;
                }
                return true;
            }).Select(p => p.Item2)
            .Cast<IAssemblyInjectASyncInitStarStop>()
            .ToArray();
    }

    public async Task StartAsync(CancellationToken cancellationToken)
    {
        _logger.LogInformation($"Initialization...");

        if (_syncServices.Count == 0) _logger.LogInformation($"No component found for sync init.");
        else
        {
            foreach (var service in _syncServices)
            {
                _logger.LogInformation($"Initializing sync {service.GetType()}");
                try
                {
                    service.Init();
                }
                catch (Exception e)
                {
                    _logger.LogError(e, nameof(service.Init));
                }
            }
            _logger.LogInformation($"All components sync initialized.");
        }

        if (_asyncServices.Count == 0) _logger.LogInformation($"No component found for async init.");
        else
        {
            foreach (var service in _asyncServices)
            {
                _logger.LogInformation($"Initializing async {service.GetType()}");
                try
                {
                    await service.InitAsync();
                }
                catch (Exception e)
                {
                    _logger.LogError(e, nameof(service.InitAsync));
                }
            }
            _logger.LogInformation($"All components initialized async.");
        }

        _logger.LogInformation($"Starting...");

        if (_syncServices.Count == 0) _logger.LogInformation($"No component found for sync start.");
        else
        {
            foreach (var service in _syncServices)
            {
                _logger.LogInformation($"Starting sync {service.GetType()}");
                try
                {
                    service.Start();
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex, nameof(service.Start));
                }
            }
            _logger.LogInformation($"All components started sync.");
        }

        if (_asyncServices.Count == 0) _logger.LogInformation($"No component found for async start.");
        else
        {
            foreach (var service in _asyncServices)
            {
                _logger.LogInformation($"Starting async {service.GetType()}");
                try
                {
                    await service.StartAsync();
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex, nameof(service.StartAsync));
                }
            }
            _logger.LogInformation($"All components started async.");
        }
    }

    public async Task StopAsync(CancellationToken cancellationToken)
    {
        _logger.LogInformation($"Stopping...");

        if (_syncServices.Count == 0) _logger.LogInformation($"No component stopped for sync.");
        else
        {
            foreach (var service in _syncServices)
            {
                _logger.LogInformation($"Stopping sync {service.GetType()}");
                try
                {
                    service.Stop();
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex, nameof(service.Stop));
                }
            }
            _logger.LogInformation($"All components stopped sync.");
        }

        if (_asyncServices.Count == 0) _logger.LogInformation($"No component stopped for async.");
        else
        {
            foreach (var service in _asyncServices)
            {
                _logger.LogInformation($"Stopping async {service.GetType()}");
                try
                {
                    await service.StopAsync();
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex, nameof(service.StopAsync));
                }
            }
            _logger.LogInformation($"All components stopped async.");
        }
    }
}