using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using Dapper;
using DataModel.Models;

namespace DataModel.Process
{
    /// <summary>
    /// User tracking functions for LotFinderDB interface
    /// </summary>
    public partial class LotFinderDB
    {
        /// <summary>
        /// Finds users with matching user ID or full name
        /// </summary>
        private const string SQL_SEARCH_USERS = @"
             SELECT TOP 25
                    u.AddressNumber,
                    COALESCE(u.UserID,' ') AS UserID,
                    u.FullName,
                    u.LastUpdateDT
             FROM   dbo.JdeUser AS u
             WHERE  u.UserID LIKE '%' + @filter + '%' OR
                    u.FullName LIKE '%' + @filter + '%' OR
                    CAST(u.AddressNumber AS VARCHAR(10)) LIKE '%' + @filter + '%' 
             ORDER BY u.UserID, u.FullName";

        /// <summary>
        /// Finds users with matching user ID or full name
        /// </summary>
        /// <param name="filter">Search filter</param>
        /// <returns>Users with matching matching user ID or full name</returns>
        public static List<JdeUser> SearchUsers(string filter)
        {
            List<JdeUser> results = new List<JdeUser>();

            try
            {
                using (SqlConnection connection = GetConnection())
                {
                    results.AddRange(connection.Query<JdeUser>(SQL_SEARCH_USERS, new{filter}));
                }
            }
            catch (Exception error)
            {
                //Log and forward exception
                logger.Error("SearchUsers: failed to search for user '{0}': {1}.", filter, error.Message);
                throw new Exception($"Failed to get serach for user '{filter}' from LotFinderDB.", error);
            }

            return results;
        }

        /// <summary>
        /// Query to find users with matching user IDs
        /// </summary>
        private const string SQL_LOOKUP_USERS = @"
             SELECT u.AddressNumber,
                    u.UserID,
                    u.FullName,
                    u.LastUpdateDT
             FROM   dbo.JdeUser AS u INNER JOIN
                    @userIDs u2 ON (u.UserID = u2.UserName OR CAST(u.AddressNumber AS VARCHAR(20)) = u2.UserName)
             ORDER BY u.UserID";

        /// <summary>
        /// Finds users with matching user IDs
        /// </summary>
        /// <param name="userIDs">User IDs to match</param>
        /// <returns>Users with matching user IDs</returns>
        public static List<JdeUser> LookupUsers(List<string> userIDs)
        {
            List<JdeUser> results = new List<JdeUser>();

            try
            {
                //Create search filter parameter
                DataTable dataTable = new DataTable();
                dataTable.Columns.Add("UserName", typeof(string));
                foreach (string userID in userIDs)
                {
                    dataTable.Rows.Add(userID);
                }

                using (SqlConnection connection = GetConnection())
                {
                    results = connection.Query<JdeUser>(SQL_LOOKUP_USERS, new { userIDs = dataTable.AsTableValuedParameter("OperatorFilterParameter") }).ToList();
                }
            }
            catch (Exception error)
            {
                //Log and forward exception
                logger.Error("LookupUsers: failed to find matching users: {0}.", error.Message);
                throw new Exception("LookupUsers: failed to find matching users in LotFinderDB.", error);
            }

            return results;
        }
    }
}