using Microsoft.Extensions.DependencyInjection;
using SqlSugar;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using Wood.Util;

namespace WoodWood.Util.Validations
{
    /// <summary>
    /// 数据库中 唯一值验证
    /// null 和 "" 不会进行验证
    /// </summary>
    public class UniqueValueAttribute : ValidationAttribute
    {
        /// <summary>
        /// 字段名称，留空取当前
        /// </summary>
        public string? PropertyName { get; set; }
        /// <summary>
        /// 实体，留空取当前
        /// </summary>
        public Type? EntityType { get; set; }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="value"></param>
        /// <param name="validationContext"></param>
        /// <returns></returns>
        protected override ValidationResult IsValid(object? value, ValidationContext validationContext)
        {
            if (value == null|| string.IsNullOrEmpty(value.ToString()))
                return ValidationResult.Success!;

            var serviceProvider = validationContext.GetService(typeof(IServiceProvider)) as IServiceProvider;
            if (serviceProvider == null)
                return new ValidationResult($"[{validationContext.MemberName}]无法获取服务提供者！");

            // 获取 ISqlSugarClient 实例
            var sqlClient = serviceProvider!.GetRequiredService<ISqlSugarClient>();
            if (sqlClient == null)
                return new ValidationResult($"[{validationContext.MemberName}]无法获取 ISqlSugarClient！");

            string sqlTable = "";
            bool hasTenantFilter = false;
            bool hasDeletedFilter = false;
            string sqlProperty = "";
            Type sqlPropertyType;
            //字段名
            if (string.IsNullOrEmpty(PropertyName))
                // 获取成员名称（属性名）
                sqlProperty = validationContext.MemberName ?? "";
            else
                sqlProperty = PropertyName;
            Type sqlType;
            //表明
            if (EntityType == null)
                sqlType = validationContext.ObjectType;
            else
                sqlType = EntityType;

            // 获取类上的所有自定义特性，包括继承的特性
            var classAttributes = sqlType.GetCustomAttributes(true);
            // 如果你知道具体要查找的特性类型，可以直接获取它
            var sugarTable = Attribute.GetCustomAttribute(sqlType, typeof(SugarTable)) as SugarTable;
            if (sugarTable == null)
                return new ValidationResult($"[{validationContext.MemberName}]无法识别SugarTable表信息！");
            sqlTable = sugarTable.TableName;

            // 假设我们要检查 实体是否有 租户过滤特性
            hasTenantFilter = sqlType.GetInterfaces().Any(it => it.Name == "ITenantIdFilter");

            // 假设我们要检查 实体是否有 软删除过滤特性
            hasDeletedFilter = sqlType.GetInterfaces().Any(it => it.Name == "IDeletedFilter");

            //字段类型
            sqlPropertyType = sqlType.GetProperty(sqlProperty)!.PropertyType;

            // 获取当前对象实例及其主键值
            var propertyInfo = validationContext.ObjectType.GetProperty("Id");
            var primaryKeyValue = propertyInfo?.GetValue(validationContext.ObjectInstance);
            long idVal = 0;
            if (primaryKeyValue == null)
                return new ValidationResult($"[{validationContext.MemberName}]无法识别主键信息！");
            else
                idVal = primaryKeyValue.ToString()!.ToLong();

            string sql = $"select count(id) from {sqlTable} where ";

            if (sqlPropertyType == typeof(string))
                sql += $"{sqlProperty}='{value.ToString()}'";
            else if (sqlPropertyType == typeof(int))
                sql += $"{sqlProperty}={value}";
            else if (sqlPropertyType == typeof(long))
                sql += $"{sqlProperty}={value}";
            else
                return new ValidationResult($"[{validationContext.MemberName}]不支持的字段类型，只支持【string，int，long】！");

            if (idVal > 0)
                sql += $" and Id != {idVal}";

            var userInfo = GlobalContext.UserInfo;
            if (hasTenantFilter)
                if (userInfo == null)
                    return new ValidationResult($"[{validationContext.MemberName}]没有找到租户信息！");
                else
                    if(!userInfo.IsSuperAdmin)
                        sql += $" and Tenantid={userInfo.TenantId}";


            if (hasDeletedFilter)
                sql += $" and IsDelete=0";

            var res = sqlClient.Ado.SqlQuerySingle<int>(sql);
            if (res > 0)
                return new ValidationResult(!string.IsNullOrEmpty(ErrorMessage) ? ErrorMessage : $"该{validationContext.MemberName}已存在，请输入其他值。");

            // 执行同步验证逻辑
            return ValidationResult.Success!;
        }
    }
}