using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Cors;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Controllers;
using Microsoft.AspNetCore.Mvc.Filters;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Security.Claims;
using System.Text.Encodings.Web;
using System.Text.Json;
using System.Text.Unicode;

using Znyc.Admin.AspNetCore.Common;
using Znyc.Admin.AspNetCore.Entitys;
using Znyc.Admin.AspNetCore.Mvc;
using Znyc.Admin.AspNetCore.Mvc.Filter;
using Znyc.Admin.Commons.Cache;
using Znyc.Admin.Commons.Entitys;
using Znyc.Admin.Commons.Extensions;
using Znyc.Admin.Commons.Helpers;
using Znyc.Admin.Commons.Json;
using Znyc.Admin.Commons.Log;
using Znyc.Admin.Commons.Pages;
using Znyc.Admin.Security.Dtos;

namespace Znyc.Admin.AspNetCore.Controllers
{
    /// <summary>
    /// WebApi控制器基类
    /// </summary>
    [ApiController]
    [EnableCors("Cors")]
    public class ApiController : Controller
    {
        /// <summary>
        /// 当前登录的用户属性
        /// </summary>
        public AdminCurrentUser CurrentUser;

        #region

        /// <summary>
        /// 重写基类在Action执行之前的事情
        /// 根据token获得当前用户，允许匿名的不需要获取用户
        /// </summary>
        /// <param name="context">重写方法的参数</param>
        public override void OnActionExecuting(ActionExecutingContext context)
        {
            try
            {
                ControllerActionDescriptor controllerActionDescriptor = context.ActionDescriptor as ControllerActionDescriptor;
                //匿名访问，不需要token认证、签名和登录
                Attribute allowanyone = controllerActionDescriptor.MethodInfo.GetCustomAttribute(typeof(AllowAnonymousAttribute), true);
                if (allowanyone != null)
                {
                    return;
                }

                CommonResult result = new CommonResult();
                //需要token认证
                string authHeader = context.HttpContext.Request.Headers["Authorization"];//Header中的token
                if (string.IsNullOrEmpty(authHeader))
                {
                    result.ErrCode = "40004";
                    result.ErrMsg = ErrCode.err40004;
                    context.Result = ToJsonContent(result);
                    return;
                }
                else
                {
                    string token = string.Empty;
                    if (authHeader != null && authHeader.StartsWith("Bearer ", StringComparison.Ordinal))
                    {
                        token = authHeader.Substring(7);
                    }

                    TokenProvider tokenProvider = new TokenProvider();
                    result = tokenProvider.ValidateToken(token);
                    //token验证失败
                    if (!result.Success)
                    {
                        context.Result = ToJsonContent(result);
                    }
                    else
                    {
                        #region 是否需要验证用户登录以及相关的功能权限

                        //是否需要用户登录
                        Attribute isDefined = controllerActionDescriptor.MethodInfo.GetCustomAttribute(typeof(NoPermissionRequiredAttribute));
                        //不需要登录
                        if (isDefined != null)
                        {
                            return;
                        }
                        //需要登录和验证功能权限
                        if (result.ResData != null)
                        {
                            List<Claim> claimlist = result.ResData as List<Claim>;
                            string userId = claimlist[3].Value;

                            Claim[] claims = new[] {
                               new Claim(ZnycClaimTypes.UserId,userId),
                               new Claim(ZnycClaimTypes.UserName,claimlist[2].Value),
                               new Claim(ZnycClaimTypes.Role,claimlist[4].Value)
                            };
                            ClaimsIdentity identity = new ClaimsIdentity(claims);
                            ClaimsPrincipal principal = new ClaimsPrincipal(identity);
                            context.HttpContext.User = principal;
                            CacheHelper yuebonCacheHelper = new CacheHelper();
                            AdminCurrentUser user = yuebonCacheHelper.Get<AdminCurrentUser>("login_user_" + userId);
                            if (user != null)
                            {
                                CurrentUser = user;
                            }
                            bool isAdmin = Permission.IsAdmin(user);
                            if (!isAdmin)
                            {
                                IEnumerable<FunctionAuthorizeAttribute> authorizeAttributes = controllerActionDescriptor.MethodInfo.GetCustomAttributes(typeof(FunctionAuthorizeAttribute), true).OfType<FunctionAuthorizeAttribute>();
                                if (authorizeAttributes.FirstOrDefault() != null)
                                {
                                    string function = authorizeAttributes.First().Function;
                                    if (!string.IsNullOrEmpty(function))
                                    {
                                        string functionCode = controllerActionDescriptor.ControllerName + "/" + function;

                                        bool bl = Permission.HasFunction(functionCode, userId.ToInt());
                                        if (!bl)
                                        {
                                            result.ErrCode = "40006";
                                            result.ErrMsg = ErrCode.err40006;
                                            context.Result = ToJsonContent(result);
                                        }
                                    }
                                }
                            }
                            return;
                        }
                        else
                        {
                            result.ErrCode = "40008";
                            result.ErrMsg = ErrCode.err40008;
                            context.Result = ToJsonContent(result);
                        }

                        #endregion 是否需要验证用户登录以及相关的功能权限
                    }
                    return;
                }
            }
            catch (Exception ex)
            {
                Log4NetHelper.Error("", ex);
            }
        }

        #endregion

        /// <summary>
        /// 把object对象转换为ContentResult
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        [HttpPost]
        [Route("api/ToJsonContent")]
        protected IActionResult ToJsonContent(object obj)
        {
            return Content(obj.ToJson());
        }

        /// <summary>
        /// 把object对象转换为ContentResult
        /// </summary>
        /// <param name="obj">转换对象</param>
        /// <param name="isNull">是否忽略空值</param>
        /// <returns></returns>
        [HttpPost]
        [Route("api/ToJsonContent")]
        protected IActionResult ToJsonContent(object obj, bool isNull = false)
        {
            JsonSerializerOptions options = new JsonSerializerOptions()
            {
                WriteIndented = true,                                   //格式化json字符串
                AllowTrailingCommas = true,                             //可以结尾有逗号
                IgnoreNullValues = true,                              //可以有空值,转换json去除空值属性
                IgnoreReadOnlyProperties = true,                        //忽略只读属性
                PropertyNameCaseInsensitive = true,                     //忽略大小写
                Encoder = JavaScriptEncoder.Create(UnicodeRanges.All)
            };
            options.Converters.Add(new DateTimeJsonConverter());
            return Content(JsonSerializer.Serialize(obj, options));
        }

        /// <summary>
        /// 根据Request参数获取分页对象数据
        /// </summary>
        /// <returns></returns>
        protected virtual PagerInfo GetPagerInfo()
        {
            int pageSize = Request.Query["length"].ToString() == null ? 1 : Request.Query["length"].ToString().ToInt();
            int pageIndex = 1;
            string currentPage = Request.Query["CurrentPage"].ToString();
            if (string.IsNullOrWhiteSpace(currentPage))
            {
                string start = Request.Query["start"].ToString();
                if (!string.IsNullOrWhiteSpace(start))
                {
                    pageIndex = (start.ToInt() / pageSize) + 1;
                }
            }
            else
            {
                pageIndex = currentPage.ToInt();
            }
            PagerInfo pagerInfo = new PagerInfo
            {
                CurrenetPageIndex = pageIndex,
                PageSize = pageSize
            };
            return pagerInfo;
        }

        /// <summary>
        /// 获取token
        /// </summary>
        /// <returns></returns>
        [HttpGet("GetToken")]
        [HiddenApi]
        public string GetToken()
        {
            string token = HttpContext.Request.Query["Token"];
            if (!string.IsNullOrEmpty(token))
            {
                return token;
            }

            string authHeader = HttpContext.Request.Headers["Authorization"];//Header中的token
            if (authHeader != null && authHeader.StartsWith("Bearer"))
            {
                token = authHeader.Substring("Bearer ".Length).Trim();
                return token;
            }
            string cookie = HttpContext.Request.Cookies["Token"];
            return cookie == null ? string.Empty : cookie;
        }
    }
}