using System;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using gswi.Data;
using gswi.Model;
using Microsoft.EntityFrameworkCore;

namespace gswi {
    public class DataSeeder {
        private readonly DatabaseContext _databaseContext;

        public DataSeeder(DatabaseContext databaseContext) {
            _databaseContext = databaseContext;
        }

        public void SeedData() {
            _databaseContext.Database.EnsureCreated();

            if (!_databaseContext.AuthUsers.Any()) {
                var admin = new AuthUser() {
                    FirstName = "Admin",
                    LastName = "Admin",
                    EMail = "admin@localhost.local",
                    Password = ComputeHash("localhost.local", new SHA256CryptoServiceProvider()),
                    AuthRole = AuthRoles.Admin
                };

                var support = new AuthUser() {
                    FirstName = "Support",
                    LastName = "Supporter",
                    EMail = "support@localhost.local",
                    Password = ComputeHash("localhost.local", new SHA256CryptoServiceProvider()),
                    AuthRole = AuthRoles.Supporter
                };

                var user = new AuthUser() {
                    FirstName = "User",
                    LastName = "User",
                    EMail = "user@localhost.local",
                    Password = ComputeHash("localhost.local", new SHA256CryptoServiceProvider()),
                    AuthRole = AuthRoles.User
                };

                _databaseContext.AuthUsers.Add(admin);
                _databaseContext.AuthUsers.Add(support);
                _databaseContext.AuthUsers.Add(user);
            }
            _databaseContext.SaveChanges();
        }

        public string ComputeHash(string input, HashAlgorithm algorithm) {
            Byte[] inputBytes = Encoding.UTF8.GetBytes(input);
            Byte[] hashedBytes = algorithm.ComputeHash(inputBytes);
            return BitConverter.ToString(hashedBytes);
        }
    }
}