using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Text;
using WebLib;

namespace Education
{
    /// <summary>
    /// 取得權限設定
    /// </summary>
    public class MWEB: DAC
    {
        public MWEB()
        {
        }

        /// <summary>
        /// 檢查目前登入的員工是否有某程式的權限
        /// </summary>
        /// <param name="programId">程式編號</param>
        /// <param name="rightName">權限名稱</param>
        /// <param name="employeeId">員工編號</param>
        /// <returns></returns>
        public bool CheckRight(string programId, WRightName rightName, string employeeId)
        {
            if (programId == null)
                programId = "NO PROGRAM ID";
            if (employeeId == null)
                employeeId = "NOBODY";

            // 取得員工權限
            string right1 = BWCPE_GetRight(programId, employeeId, rightName);

            // 取得這個員工隸屬的群組
            string[] bpglps = BWEH_GetBpglpListByBpeno(employeeId);

            // 取得各群組權限
            string[] right2 = new string[bpglps.Length];
            for (int i = 0; i < right2.Length; i++)
            {
                right2[i] = BWCPG_GetRight(programId, bpglps[i], rightName);
            }

            // 綜合判斷權限
            string right = "";

            if (right1 != "")
                right = right1;

            if (right != "Y")
                for (int i = 0; i < right2.Length; i++)
                {
                    if (right2[i] != "")
                    {
                        if (right != "Y" && right2[i] == "Y")
                            right = "Y";
                        else if (right != "Y" && right2[i] == "N")
                            right = "N";
                    }
                }
            return right == "Y";
        }

        /// <summary>
        /// 取員工權限 
        /// </summary>
        /// <param name="rightId">權限編號</param>
        /// <param name="employId">員工編號</param>
        /// <param name="functionName">功能名稱</param>
        /// <returns></returns>
        private string BWCPE_GetRight(string rightId, string employId, WRightName functionName)
        {
            string funcName = "";
            switch (functionName)
            {
                case WRightName.Execute:
                    funcName = "BPRT1";
                    break;
                case WRightName.Insert:
                    funcName = "BPRTI";
                    break;
                case WRightName.Update:
                    funcName = "BPRTM";
                    break;
                case WRightName.Delete:
                    funcName = "BPRTD";
                    break;
                case WRightName.Search:
                    funcName = "BPRTF";
                    break;
                case WRightName.Print:
                    funcName = "BPRTP";
                    break;
            }

            DbCommand cmd = NewCommand();
            cmd.CommandText = @"SELECT BPRT1, BPRTI, BPRTM, BPRTD, BPRTF, BPRTP FROM BWCPE WHERE BPPRG=@BPPRG AND BPENO=@BPENO";

            AddParam(cmd, "BPPRG", rightId);
            AddParam(cmd, "BPENO", employId);

            DataTable data = Select(cmd);
            if (data.Rows.Count != 0)
            {
                return data.Rows[0][funcName].ToString();
            }
            return "";
        }

        /// <summary>
        /// 取員工所屬群組
        /// </summary>
        /// <param name="employeeId"></param>
        /// <returns></returns>
        private string[] BWEH_GetBpglpListByBpeno(string employeeId)
        {
            DbCommand cmd = NewCommand();
            cmd.CommandText = @"SELECT E.BPGLP AS BPGLP
              FROM BWEG E, BWEH G
              WHERE E.BPGLP=G.BPGLP AND G.BPENO=@BPENO
              ORDER BY E.BPGLP ";
            AddParam(cmd, "BPENO", employeeId);

            DataTable inGroup = Select(cmd);
            if (inGroup.Rows.Count == 0)
                return new string[0];
            else
            {
                string[] result = new string[inGroup.Rows.Count];
                for (int i = 0; i < inGroup.Rows.Count; i++)
                {
                    result[i] = inGroup.Rows[i][0].ToString();
                }
                return result;
            }
        }

        /// <summary>
        /// 取群組權限
        /// </summary>
        /// <param name="rightId">權限編號</param>
        /// <param name="groupId">群組編號</param>
        /// <param name="functionName">功能名稱</param>
        /// <returns></returns>
        /// <exception cref="NotImplementedException"></exception>
        private string BWCPG_GetRight(string rightId, string groupId, WRightName functionName)
        {
            string funcName = "";
            switch (functionName)
            {
                case WRightName.Execute:
                    funcName = "BPRT1";
                    break;
                case WRightName.Insert:
                    funcName = "BPRTI";
                    break;
                case WRightName.Update:
                    funcName = "BPRTM";
                    break;
                case WRightName.Delete:
                    funcName = "BPRTD";
                    break;
                case WRightName.Search:
                    funcName = "BPRTF";
                    break;
                case WRightName.Print:
                    funcName = "BPRTP";
                    break;
            }

            DbCommand cmd = NewCommand();
            cmd.CommandText = @"SELECT BPRT1, BPRTI, BPRTM, BPRTD, BPRTF, BPRTP FROM BWCPG WHERE BPPRG=@BPPRG AND BPGLP=@BPGLP";

            AddParam(cmd, "BPPRG", rightId);
            AddParam(cmd, "BPGLP", groupId);

            DataTable data = Select(cmd);
            if (data.Rows.Count != 0)
            {
                return data.Rows[0][funcName].ToString();
            }
            return "";
        }
    }

    public enum WRightName
    {
        /// <summary>
        /// 主檔
        /// </summary>
        Execute,
        /// <summary>
        /// 新增
        /// </summary>
        Insert,
        /// <summary>
        /// 更正
        /// </summary>
        Update,
        /// <summary>
        /// 刪除
        /// </summary>
        Delete,
        /// <summary>
        /// 查詢
        /// </summary>
        Search,
        /// <summary>
        /// 印表
        /// </summary>
        Print
    }

    public class ProgramID
    {
        public const string 匯出基本資料 = "TR_EXPORT";
    }
}