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

namespace WebApplication.Repositorys {
    public class CustomerRepository : ICustomerRepository {
        private string GetFreeId() {
            string guid = Guid.NewGuid().ToString();
            while (true) {
                if (GetCustomer(guid) is not null) guid = Guid.NewGuid().ToString();
                else break;
            }

            return guid;
        }

        public Customer AddCustomer(CustomerEditor editor) {
            Customer customer = new Customer {Guid = GetFreeId(), CreationDate = DateTime.Now};
            editor.EditCustomer(customer);
            SaveCustomer(customer);
            return customer;
        }

        public void RemoveCustomer(string id) {
            MySQL.Insert($"DELETE FROM Customers WHERE Guid = \"{id}\"");
        }

        public void EditCustomer(string id, CustomerEditor editor) {
            RemoveCustomer(id);
            Customer customer = GetCustomer(id);
            editor.EditCustomer(customer);
            SaveCustomer(customer);
        }

        public Customer GetCustomer(string id) {
            MySqlDataReader reader = MySQL.GetData($"SELECT * FROM Customers WHERE Guid = \"{id}\"");
            if (reader.Read()) {
                Customer customer = new Customer();
                customer.Guid = reader.GetString("Guid");
                customer.CreationDate = DateTime.Parse(reader.GetString("CreationDate"));
                customer.FirstName = reader.GetString("FirstName");
                customer.LastName = reader.GetString("LastName");
                customer.Email = reader.GetString("Email");
                customer.Username = reader.GetString("Username");
                customer.Password = reader.GetString("Password");
                customer.Balance = float.Parse(reader.GetString("Balance"));
                reader.Close();
                return customer;
            }
            reader.Close();
            return null;
        }

        public IEnumerable<Customer> GetCustomers() {
            List<Customer> customers = new List<Customer>();
            MySqlDataReader reader = MySQL.GetData("SELECT * FROM Customers");
            while (reader.Read()) {
                Customer customer = new Customer();
                customer.Guid = reader.GetString("Guid");
                customer.CreationDate = DateTime.Parse(reader.GetString("CreationDate"));
                customer.FirstName = reader.GetString("FirstName");
                customer.LastName = reader.GetString("LastName");
                customer.Email = reader.GetString("Email");
                customer.Username = reader.GetString("Username");
                customer.Balance = float.Parse(reader.GetString("Balance"));
                customers.Add(customer);
            }
            reader.Close();
            return customers;
        }

        private void SaveCustomer(Customer customer) {
            MySQL.Insert($"INSERT INTO Customers VALUES (\"{customer.Guid}\", \"{customer.CreationDate}\", \"{customer.FirstName}\", \"{customer.LastName}\", \"{customer.Email}\", \"{customer.Username}\", \"{customer.Password}\", \"{customer.Balance}\")");
        }
    }
}