using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.OAuth;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

using System.Collections.Concurrent;
using System.Security.Claims;
using System.Text.Encodings.Web;

using ThingsGateway.Extension;

namespace ThingsGateway.Admin.Application;

/// <summary>
/// 只适合 Demo 登录，会直接授权超管的权限
/// </summary>
public class AdminOAuthHandler<TOptions>(
   IVerificatInfoService verificatInfoService,
   IAppService appService,
   ISysUserService sysUserService,
   ISysDictService configService,
    IOptionsMonitor<TOptions> options,
    ILoggerFactory logger,
    IUserAgentService userAgentService,
    UrlEncoder encoder
) : OAuthHandler<TOptions>(options, logger, encoder)
    where TOptions : AdminOAuthOptions, new()
{
    static AdminOAuthHandler()
    {
        Task.Factory.StartNew(InsertableAsync, CancellationToken.None, TaskCreationOptions.None, TaskScheduler.Default);
    }

    /// <summary>
    /// 日志消息队列（线程安全）
    /// </summary>
    protected static readonly ConcurrentQueue<SysOperateLog> _operateLogMessageQueue = new();

    /// <summary>
    /// 创建访问日志
    /// </summary>
    private static async Task InsertableAsync()
    {
        var db = DbContext.GetDB<SysOperateLog>();
        var appLifetime = App.RootServices!.GetService<IHostApplicationLifetime>()!;
        while (!appLifetime.ApplicationStopping.IsCancellationRequested)
        {
            try
            {
                var data = _operateLogMessageQueue.ToListWithDequeue(); // 从日志队列中获取数据
                if (data.Count > 0)
                {
                    await db.InsertableWithAttr(data).ExecuteCommandAsync(appLifetime.ApplicationStopping).ConfigureAwait(false);//入库
                }
            }
            catch (Exception ex)
            {
                NewLife.Log.XTrace.WriteException(ex);
            }
            finally
            {
                await Task.Delay(3000, appLifetime.ApplicationStopping).ConfigureAwait(false);
            }
        }
    }

    protected override async Task<AuthenticationTicket> CreateTicketAsync(
        ClaimsIdentity identity,
        AuthenticationProperties properties,
        OAuthTokenResponse tokens)
    {
        Backchannel.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", tokens.AccessToken);
        properties.RedirectUri = Options.HomePath;
        properties.IsPersistent = true;
        var appConfig = await configService.GetAppConfigAsync().ConfigureAwait(false);

        int expire = appConfig.LoginPolicy.VerificatExpireTime;
        if (!string.IsNullOrEmpty(tokens.ExpiresIn) && int.TryParse(tokens.ExpiresIn, out var result))
        {
            properties.ExpiresUtc = TimeProvider.System.GetUtcNow().AddSeconds(result);
            expire = (int)(result / 60.0);
        }
        var user = await Options.HandleUserInfoAsync(Context, tokens).ConfigureAwait(false);

        var loginEvent = await GetLogin(expire).ConfigureAwait(false);
        await UpdateUser(loginEvent).ConfigureAwait(false);
        identity.AddClaim(new Claim(ClaimConst.VerificatId, loginEvent.VerificatId.ToString()));
        identity.AddClaim(new Claim(ClaimConst.UserId, RoleConst.SuperAdminId.ToString()));

        identity.AddClaim(new Claim(ClaimConst.SuperAdmin, "true"));
        identity.AddClaim(new Claim(ClaimConst.OrgId, RoleConst.DefaultTenantId.ToString()));
        identity.AddClaim(new Claim(ClaimConst.TenantId, RoleConst.DefaultTenantId.ToString()));

        var context = new OAuthCreatingTicketContext(
            new ClaimsPrincipal(identity),
            properties,
            Context,
            Scheme,
            Options,
            Backchannel,
            tokens,
            user
        );

        context.RunClaimActions();
        await Events.CreatingTicket(context).ConfigureAwait(false);

        var httpContext = context.HttpContext;
        UserAgent? userAgent = null;
        var str = httpContext?.Request?.Headers?.UserAgent;
        if (!string.IsNullOrEmpty(str))
        {
            userAgent = userAgentService.Parse(str);
        }

        var sysOperateLog = new SysOperateLog()
        {
            Name = this.Scheme.Name,
            Category = LogCateGoryEnum.Login,
            ExeStatus = true,
            OpIp = httpContext.GetRemoteIpAddressToIPv4(),
            OpBrowser = userAgent?.Browser,
            OpOs = userAgent?.Platform,
            OpTime = DateTime.Now,
            VerificatId = loginEvent.VerificatId,
            OpAccount = Options.GetName(user),

            ReqMethod = "OAuth",
            ReqUrl = string.Empty,
            ResultJson = string.Empty,
            ClassName = nameof(AdminOAuthHandler<TOptions>),
            MethodName = string.Empty,
            ParamJson = string.Empty,
        };
        _operateLogMessageQueue.Enqueue(sysOperateLog);
        return new AuthenticationTicket(context.Principal, context.Properties, Scheme.Name);
    }

    private async Task<LoginEvent> GetLogin(int expire)
    {
        var sysUser = await sysUserService.GetUserByIdAsync(RoleConst.SuperAdminId).ConfigureAwait(false);//获取用户信息

        var loginEvent = new LoginEvent
        {
            Ip = appService.RemoteIpAddress,
            Device = appService.UserAgent?.Platform,
            Expire = expire,
            SysUser = sysUser,
            VerificatId = CommonUtils.GetSingleId()
        };

        //获取verificat列表
        var tokenTimeout = loginEvent.DateTime.AddMinutes(loginEvent.Expire);
        //生成verificat信息
        var verificatInfo = new VerificatInfo
        {
            Device = loginEvent.Device,
            Expire = loginEvent.Expire,
            VerificatTimeout = tokenTimeout,
            Id = loginEvent.VerificatId,
            UserId = loginEvent.SysUser.Id,
            LoginIp = loginEvent.Ip,
            LoginTime = loginEvent.DateTime
        };

        //添加到verificat列表
        verificatInfoService.Add(verificatInfo);
        return loginEvent;
    }

    /// <summary>
    /// 登录事件
    /// </summary>
    /// <param name="loginEvent"></param>
    /// <returns></returns>
    private async Task UpdateUser(LoginEvent loginEvent)
    {
        var sysUser = loginEvent.SysUser;

        #region 登录/密码策略

        var key = CacheConst.Cache_LoginErrorCount + sysUser.Account;//获取登录错误次数Key值
        App.CacheService.Remove(key);//移除登录错误次数

        //获取用户verificat列表
        var userToken = verificatInfoService.GetOne(loginEvent.VerificatId);

        #endregion 登录/密码策略

        #region 重新赋值属性,设置本次登录信息为最新的信息

        sysUser.LastLoginIp = sysUser.LatestLoginIp;
        sysUser.LastLoginTime = sysUser.LatestLoginTime;
        sysUser.LatestLoginIp = loginEvent.Ip;
        sysUser.LatestLoginTime = loginEvent.DateTime;

        #endregion 重新赋值属性,设置本次登录信息为最新的信息

        using var db = DbContext.GetDB<SysUser>();
        //更新用户登录信息
        if (await db.UpdateableT(sysUser).UpdateColumns(it => new
        {
            it.LastLoginIp,
            it.LastLoginTime,
            it.LatestLoginIp,
            it.LatestLoginTime,
        }).ExecuteCommandAsync().ConfigureAwait(false) > 0)
            App.CacheService.HashAdd(CacheConst.Cache_SysUser, sysUser.Id.ToString(), sysUser);//更新Cache信息
    }
}

/// <summary>自定义 Token 异常</summary>
public class OAuthTokenException : Exception
{
    public OAuthTokenException() : base()
    {
    }

    public OAuthTokenException(string? message, Exception? innerException) : base(message, innerException)
    {
    }

    public OAuthTokenException(string? message) : base(message)
    {
    }
}