using System;
using System.Text;
using System.Threading.Tasks;
using DS.Module.Core.Exceptions;
using DS.Module.Core.Modules;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.FileProviders;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;

namespace DS.Module.Core.Extensions;

public static partial class Extensions
{
    /// <summary>
    /// 获取指定类型的日志对象
    /// </summary>
    /// <typeparam name="T">非静态强类型</typeparam>
    /// <returns>日志对象</returns>
    public static ILogger<T> GetLogger<T>(this IServiceProvider provider)
    {
        ILoggerFactory factory = provider.GetService<ILoggerFactory>();
        return factory.CreateLogger<T>();
    }

    /// <summary>
    ///
    /// </summary>
    /// <param name="provider"></param>
    /// <param name="type"></param>
    /// <returns></returns>
    public static ILogger GetLogger(this IServiceProvider provider, Type type)
    {
        ILoggerFactory factory = provider.GetService<ILoggerFactory>();
        return factory.CreateLogger(type);
    }

    // public static AppOptionSettings GetAppSettings(this IServiceProvider provider)
    // {
    //     provider.NotNull(nameof(provider));
    //     return provider.GetService<IOptions<AppOptionSettings>>()?.Value;
    // }

    public static object GetInstance(this IServiceProvider provider, ServiceDescriptor descriptor)
    {
        if (descriptor.ImplementationInstance != null)
        {
            return descriptor.ImplementationInstance;
        }

        if (descriptor.ImplementationType != null)
        {
            return provider.GetServiceOrCreateInstance(descriptor.ImplementationType);
        }

        return descriptor.ImplementationFactory(provider);
    }

    /// <summary>
    /// 获取日志记录器
    /// </summary>
    /// <param name="provider"></param>
    /// <param name="type"></param>
    /// <returns></returns>
    public static ILogger GetLogger(this ILazyServiceProvider provider, Type type)
    {
        ILoggerFactory factory = provider.LazyGetService<ILoggerFactory>();
        return factory.CreateLogger(type);
    }

    public static object GetServiceOrCreateInstance(this IServiceProvider provider, Type type)
    {
        return ActivatorUtilities.GetServiceOrCreateInstance(provider, type);
    }

    public static object CreateInstance(this IServiceProvider provider, Type type, params object[] arguments)
    {
        return ActivatorUtilities.CreateInstance(provider, type, arguments);
    }

    public static void GetService<T>(this IServiceProvider provider, Action<T> action)
    {
        action.NotNull(nameof(action));
        var t = provider.GetService<T>();
        action(t);
    }

    /// <summary>
    ///创建一个IServiceScope，其中包含一个IServiceProvider，用于从新创建的作用域解析依赖项，然后运行关联的回调。
    /// </summary>
    public static void CreateScoped<T, TS>(this IServiceProvider provider, Action<TS, T> callback)
    {
        using var scope = provider.CreateScope();
        var service = scope.ServiceProvider.GetRequiredService<TS>();

        callback(service, scope.ServiceProvider.GetRequiredService<T>());
        if (service is IDisposable disposable)
        {
            disposable.Dispose();
        }
    }

    /// <summary>
    /// 创建一个IServiceScope，其中包含一个IServiceProvider，用于从新创建的作用域解析依赖项，然后运行关联的回调。
    /// </summary>
    public static void CreateScoped<TS>(this IServiceProvider provider, Action<TS> callback)
    {
        using var scope = provider.CreateScope();
        var service = scope.ServiceProvider.GetRequiredService<TS>();
        callback(service);
        if (service is IDisposable disposable)
        {
            disposable.Dispose();
        }
    }

    /// <summary>
    /// 创建一个IServiceScope，其中包含一个IServiceProvider，用于从新创建的作用域解析依赖项，然后运行关联的回调。
    /// </summary>
    public static T CreateScoped<T, TS>(this IServiceProvider provider, Func<TS, T> callback)
    {
        using var scope = provider.CreateScope();
        var service = scope.ServiceProvider.GetRequiredService<TS>();
        return callback(service);
    }

    /// <summary>
    /// 创建一个IServiceScope，其中包含一个IServiceProvider，用于从新创建的作用域解析依赖项，然后运行关联的回调。
    /// </summary>
    public static async Task CreateScopedAsync<T, TS>(this IServiceProvider provider, Func<TS, T, Task> callback)
    {
        using var scope = provider.GetRequiredService<IServiceScopeFactory>().CreateScope();
        var service = scope.ServiceProvider.GetRequiredService<TS>();

        await callback(service, scope.ServiceProvider.GetRequiredService<T>());
        if (service is IDisposable disposable)
        {
            disposable.Dispose();
        }
    }

    /// <summary>
    /// 创建一个IServiceScope，其中包含一个IServiceProvider，用于从新创建的作用域解析依赖项，然后运行关联的回调。
    /// </summary>
    public static async Task CreateScopedAsync<TS>(this IServiceProvider provider, Func<TS, Task> callback)
    {
        using var scope = provider.GetRequiredService<IServiceScopeFactory>().CreateScope();
        var service = scope.ServiceProvider.GetRequiredService<TS>();
        await callback(service);
        if (service is IDisposable disposable)
        {
            disposable.Dispose();
        }
    }

    /// <summary>
    ///创建一个IServiceScope，其中包含一个IServiceProvider，用于从新创建的作用域解析依赖项，然后运行关联的回调。
    /// </summary>
    public static async Task<T> CreateScopedAsync<T, TS>(this IServiceProvider provider, Func<TS, Task<T>> callback)
    {
        using var scope = provider.GetRequiredService<IServiceScopeFactory>().CreateScope();
        var service = scope.ServiceProvider.GetRequiredService<TS>();
        return await callback(service);
    }

    public static void CreateScoped(this IServiceProvider provider, Action<IServiceProvider> callback)
    {
        using var scope = provider.CreateScope();
        callback(scope.ServiceProvider);
    }

    #region 读取文件

    /// <summary>
    /// 得到文件容器
    /// </summary>
    /// <param name="provider">服务接口</param>
    /// <param name="fileName">文件名+后缀名</param>
    /// <param name="fileNotExistsMsg">文件不存提示信息</param>
    /// <returns>返回文件中的文件</returns>
    public static string GetFileText(this IServiceProvider provider, string fileName, string fileNotExistsMsg)
    {
        fileName.NotNullOrEmpty(nameof(fileName));
        var fileProvider = provider.GetService<IFileProvider>();
        fileProvider.NotNull(nameof(fileProvider));


        var fileInfo = fileProvider.GetFileInfo(fileName);

        if (!fileInfo.Exists)
        {
            if (!fileNotExistsMsg.IsNullOrEmpty())
            {
                throw new DSAppException(fileNotExistsMsg);
            }
        }

        var text = ReadAllText(fileInfo);
        if (text.IsNullOrEmpty())
        {
            throw new DSAppException("文件内容不存在");
        }

        return text;
    }


    /// <summary>
    /// 根据配置得到文件内容
    /// </summary>
    /// <param name="provider">服务接口</param>
    /// <param name="sectionKey">分区键</param>
    /// <param name="fileNotExistsMsg">文件不存提示信息</param>
    /// <returns>返回文件中的文件</returns>
    public static string GetFileByConfiguration(this IServiceProvider provider, string sectionKey,
        string fileNotExistsMsg)
    {
        sectionKey.NotNullOrEmpty(nameof(sectionKey));
        var configuration = provider.GetService<IConfiguration>();
        var value = configuration?.GetSection(sectionKey)?.Value;
        return provider.GetFileText(value, fileNotExistsMsg);
    }

    /// <summary>
    /// 读取全部文本
    /// </summary>
    /// <param name="fileInfo">文件信息接口</param>
    /// <returns></returns>
    private static string ReadAllText(IFileInfo fileInfo)
    {
        byte[] buffer;
        using var stream = fileInfo.CreateReadStream();
        buffer = new byte[stream.Length];
        stream.Read(buffer, 0, buffer.Length);
        return Encoding.Default.GetString(buffer).Trim();
    }

    #endregion
}