using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using MySql.Data.MySqlClient;
using Newtonsoft.Json;

namespace Server
{
    public class TopTen
    {
        public object? user { get; set; }
        public object? date { get; set; }
        public object? project { get; set; }
        public object? f_name { get; set; }
        public object? l_name { get; set; }
        public object? name { get; set; }
        public object? total_time { get; set; }
    }
    public class Gettopten : Route
    {
        public static void HandleRequest(HttpListenerRequest request, HttpListenerResponse response)
        {
            try
            {
                // prepare SQL query
                MySqlCommand cmd = new MySqlCommand();
                var queryString = request.QueryString;
                string? from = queryString["from"];
                string? to = queryString["to"];
                string? filterBy = queryString["filterBy"];

                if (!string.IsNullOrEmpty(to) && !string.IsNullOrEmpty(from))
                {
                    Regex regex = new Regex(@"^\d{4}-\d{2}-\d{2}$");
                    if (!regex.IsMatch(to) || !regex.IsMatch(from))
                    {
                        throw new Exception("Incorrect date format");
                    }
                }
                else
                {
                    throw new Exception("Empty date format");
                }
                if (string.IsNullOrEmpty(filterBy))
                {
                    throw new Exception("Empty filterby");
                }
                if (filterBy != "user" && filterBy != "project")
                {
                    throw new Exception("Incorrect filterby");
                }

                // this shenanigan is needed to remove the "" around
                // group by
                string req = @"SELECT t.user,t.date,t.project,u.f_name,u.l_name,p.name,SUM(t.time) as total_time 
                               FROM Timelog t 
                               INNER JOIN Project p ON p.id=t.project 
                               INNER JOIN User u ON u.id=t.user 
                               WHERE t.date BETWEEN @from AND @to
                               GROUP BY " + filterBy + @" ORDER BY total_time DESC 
                               LIMIT 10;";
                cmd.CommandText = req;
                cmd.Parameters.AddWithValue("@from", from);
                cmd.Parameters.AddWithValue("@to", to);

                using (MySqlConnection conn = new MySqlConnection(connectionString))
                {
                    cmd.Connection = conn;
                    conn.Open();
                    // Execute the query and read the results
                    MySqlDataReader reader = cmd.ExecuteReader();
                    List<TopTen> entries = new List<TopTen>();
                    while (reader.Read())
                    {
                        entries.Add(new TopTen
                        {
                            user = reader["user"],
                            date = reader["date"],
                            project = reader["project"],
                            f_name = reader["f_name"],
                            l_name = reader["l_name"],
                            name = reader["name"],
                            total_time = reader["total_time"],
                        });
                    }
                    // Serialize the data to JSON
                    string jsonResponse = JsonConvert.SerializeObject(entries);
                    // prepare response
                    SendSuccess(response, jsonResponse);

                }
            }
            catch (Exception ex)
            {
                SendError(response, ex);
            }
        }
    }
}