#region

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using CSFrameworkV5.Business.BLL_Permission;
using CSFrameworkV5.Core;
using CSFrameworkV5.Interfaces.InterfaceModels;
using DevExpress.XtraGrid.Views.Grid;

#endregion

namespace CSFrameworkV5.Library.CommonClass
{
    /// <summary>
    ///     数据权限前端应用帮助类
    /// </summary>
    public class DataPermissionHelper
    {
        private static List<DataPermissionModel> _Config;

        private static IDictionary<string, DataTable> _FieldNameDef =
            new Dictionary<string, DataTable>();

        private static void HideColumn(GridView view, string allFields,
            string allowColumns)
        {
            if (string.IsNullOrWhiteSpace(allFields)) return; //没有配置数据权限，不处理

            if (string.IsNullOrWhiteSpace(allowColumns)) return; //没有配置数据权限，不处理

            //表格中所有列的字段
            var list = view.Columns.ToArray().Select(e => e.FieldName)
                .ToArray();

            //当前表所有字段
            var arrAllfields = allFields.Split(new[] { "," },
                StringSplitOptions.RemoveEmptyEntries);

            //能查看数据的字段（有权限的字段）
            var fields = allowColumns.Split(new[] { "," },
                StringSplitOptions.RemoveEmptyEntries);

            //获取差异字段（没有数据权限的字段）
            var exceptFields = list.Except(fields).ToArray();

            //表格中移除没有数据权限的列
            foreach (var field in exceptFields)
            {
                //必须是存在的物理字段
                var w = arrAllfields.Where(e => e.ToLower() == field.ToLower())
                    .FirstOrDefault();
                //    if (arrAllfields.FindIndex(e => e.ToLower() == field.ToLower()) >= 0)
                if (!string.IsNullOrWhiteSpace(w))
                {
                    var col = view.Columns.ColumnByFieldName(field);
                    if (col != null) view.Columns.Remove(col); //表格，删除列
                }
            }
        }

        /// <summary>
        ///     刷新当前用户的数据权限配置
        /// </summary>
        public static void RefreshConfig()
        {
            _Config =
                new bllPermission().GetDataPermissionConfig(Loginer.CurrentUser
                    .Account);
        }

        /// <summary>
        ///     设置表格的权限
        /// </summary>
        /// <param name="view">表格</param>
        /// <param name="DBName">数据库</param>
        /// <param name="tableName">该数据库的表名</param>
        public static void SetPermission(GridView view, string DBName,
            string tableName)
        {
            //获取当前用户的数据权限配置
            if (_Config == null) RefreshConfig();

            //没有设置数据权限，不处理
            if (_Config.Count == 0) return;

            //1.优先处理当前用户的数据权限配置
            var m1 = _Config.Where(e =>
                e.DataType.ToUpper() == "USER" &&
                e.DBName.ToUpper() == DBName.ToUpper() &&
                e.TableName.ToUpper() == tableName.ToUpper()).FirstOrDefault();
            if (m1 != null)
            {
                HideColumn(view, m1.AllFields, m1.AllowColumns);
                return;
            }

            //2.处理当前用户所在组的数据权限配置
            var m2 = _Config.Where(e =>
                e.DataType.ToUpper() == "GROUP" &&
                e.DBName.ToUpper() == DBName.ToUpper() &&
                e.TableName.ToUpper() == tableName.ToUpper()).FirstOrDefault();
            if (m2 != null) HideColumn(view, m2.AllFields, m2.AllowColumns);
        }
    }
}