using System.IO;
using System.Threading.Tasks;
using System.Xml.Serialization;
using Microsoft.AspNetCore.Hosting;
using TIAMWebApp.Shared.Application.Models;

namespace TIAMWebApp.Server.Services
{
    public class ExchangeRateService
    {
        private readonly IWebHostEnvironment _env;
        private readonly string _filePath;

        public ExchangeRateService(IWebHostEnvironment env)
        {
            _env = env;
            _filePath = Path.Combine(_env.WebRootPath, "ExchangeRate.xml");
        }

        public async Task<ExchangeRate> GetExchangeRateAsync()
        {
            using var stream = new FileStream(_filePath, FileMode.Open);
            var serializer = new XmlSerializer(typeof(ExchangeRate));
            return (ExchangeRate)serializer.Deserialize(stream);
        }

        public async Task SetExchangeRateAsync(ExchangeRate rate)
        {
            using var stream = new FileStream(_filePath, FileMode.Create);
            var serializer = new XmlSerializer(typeof(ExchangeRate));
            serializer.Serialize(stream, rate);
        }
    }
}