using System.Linq;
using System.Threading.Tasks;
using BlueWest.Data;
using Microsoft.EntityFrameworkCore;

namespace BlueWest.WebApi.EF
{
    internal static class CountryDbExtensions
    {
                          
        internal static Country GetCountryById(this DbSet<Country> countries, int countryId) => countries.GetOne(x => x.Id == countryId);
        internal static (bool, T) NotFound<T>() where T : class => (false, null);

        internal static (bool, Country) AddCountry (this CountryDbContext dbContext, CountryCreate countryCreate)
        {
            Country newCountry = new Country(countryCreate);
            return dbContext.Countries.Add(dbContext, newCountry);
        }
        
        internal static async Task<(bool, Country)> AddCountryAsync (this CountryDbContext dbContext, CountryCreate countryCreate)
        {
            var newCountry = new Country(countryCreate);
            return await dbContext.Countries.AddAsync(dbContext, newCountry);
        }
          
        internal static (bool, Country) UpdateCountry(this CountryDbContext dbContext, CountryUpdate countryUpdate,
            int countryId)
        {
            var country = dbContext.Countries.FirstOrDefault(x => x.Id == countryId);

            if (country != null)
            {
                var updatedCountry = new Country(countryUpdate);
                return dbContext.Countries.Update(dbContext, updatedCountry);
            }

            return NotFound<Country>();
        }

        internal static async Task<Country> GetCountryByIdAsync(this DbSet<Country> countries, int countryId) => 
            await countries.FirstOrDefaultAsync(x => x.Id == countryId);

        
        internal static async Task<(bool, Country)> UpdateCountryAsync(this CountryDbContext dbContext, CountryUpdate countryUpdate,
            int countryCode)
        {
            var country = await dbContext.Countries.FirstOrDefaultAsync(x => x.Code == countryCode);

            if (country != null)
            {
                var updatedCountry = new Country(countryUpdate);
                return await dbContext.Countries.UpdateAsync(dbContext, updatedCountry);
            }
            
            return NotFound<Country>();
        }
        
        
    }
}