using System;
using MySqlConnector;
using WebApplication.Modules;
using WebApplication.Repositorys.Interfaces;

namespace WebApplication.Repositorys {
    public class SessionRepository : ISessionRepository {
        public SessionRepository() {
            MySQL.Insert("DELETE FROM Sessions");
        }
        
        public Session CreateSession(string customer) {
            Session session = new Session {Guid = GetFreeId(), CustomerId = customer, CreationDate = DateTime.Now};
            MySQL.Insert($"INSERT INTO Sessions VALUES (\"{session.Guid}\", \"{session.CustomerId}\", \"{session.CreationDate}\")");
            return session;
        }

        public void RemoveSession(Session session) {
            MySQL.Insert($"DELETE FROM Sessions WHERE Guid = \"{session.Guid}\"");
        }

        public Session GetSession(string id) {
            MySqlDataReader reader = MySQL.GetData($"SELECT * FROM Sessions WHERE Guid = \"{id}\"");
            if (reader.Read()) {
                Session session = new Session {Guid = id};
                session.CustomerId = reader.GetString("CustomerId");
                session.CreationDate = DateTime.Parse(reader.GetString("CreationDate"));
                reader.Close();
                return session;
            }
            reader.Close();
            return null;
        }

        public bool ValidateSession(Session session, string customerToAccess) {
            if (session == null) return false;
            if (session.CustomerId != customerToAccess) return false;
            TimeSpan span = DateTime.Now - session.CreationDate;
            bool valid = span.Minutes <= 30;
            if (!valid) RemoveSession(session);
            return valid;
        }

        private string GetFreeId() {
            string guid = Guid.NewGuid().ToString();
            while (true) {
                if (GetSession(guid) is not null) guid = Guid.NewGuid().ToString();
                else break;
            }

            return guid;
        }
    }
}