using System.Dynamic;
using System.Net;
using MySql.Data.MySqlClient;
using Newtonsoft.Json;

namespace TimelogBackend;

public class Getuser : Route
{
    public static void HandleRequest(HttpListenerRequest request, HttpListenerResponse response)
    {
        try
        {
            var queryString = request.QueryString;
            string? userid = queryString["userid"];
            if (string.IsNullOrEmpty(userid))
            {
                throw new Exception("Missing userid");
            }
            // prepare SQL query
            string query =
                @"SELECT p.name, SUM(t.time)
                            FROM Timelog t 
                            INNER JOIN Project p ON p.id=t.project 
                            INNER JOIN User u ON u.id=t.user 
                            WHERE User = @userid
                            GROUP BY name;";
            MySqlCommand cmd = new(query);
            cmd.Parameters.AddWithValue("@userid", userid);

            var expando = ExtractDataFromDB(cmd);
            // serialize JSON
            string jsonResponse = JsonConvert.SerializeObject(expando);
            // prepare response
            SendSuccess(response, jsonResponse);
        }
        catch (Exception ex)
        {
            SendError(response, ex);
        }
    }

    private static dynamic ExtractDataFromDB(MySqlCommand cmd)
    {
        using MySqlConnection conn = new(connectionString);
        conn.Open();
        cmd.Connection = conn;
        // execute query and read results
        MySqlDataReader reader = cmd.ExecuteReader();
        dynamic expando = new ExpandoObject();
        while (reader.Read())
        {
            ((IDictionary<string?, object>)expando)[reader["name"].ToString()] = reader[
                "SUM(t.time)"
            ];
        }
        return expando;
    }
}